Moparts
Pinion Angle - One More Time - Please
Posted By: Junky
Pinion Angle - One More Time - Please - 02/29/12 02:07 AM
OK, I raised the Coronet up on a 4 post hoist. Jacked the front end up so the drive line is level at 0°. The transmission slip yoke is 2.5° down (negative). If I understand correctly the pinion should be parallel to the slip yoke. The thing is the rear end is higher than the transmission. So the only way to make the pinion parallel is to have it 2.5° up (positive).
Let me ask, simply. With the drive line level at zero degrees, trans down 2.5°, what should the pinion be at...keeping in mind the rear end is higher than the transmission? Down or up? I didn't think that the pinion should be positive.
I have Schumacher engine and transmission mounts. There's no way to raise the transmission. No room. And if I raise the rear of the car it will look like a stink bug.
Posted By: bobs66440
Re: Pinion Angle - One More Time - Please - 02/29/12 02:13 AM
If the trans centerline is 2.5 degrees down, then the rear yoke centerline should be 2.5 degrees up. The centerlines of the trans and rear yoke should be parallel, yes. You can adjust the angle of the rear by using tapered shims/wedge plates.
http://www.summitracing.com/parts/SUM-770025/
Posted By: Junky
Re: Pinion Angle - One More Time - Please - 02/29/12 02:28 AM
Yes, perfect. I've not seen those diagrams before. That first diagram (upper left) explains it exactly. That's what my setup should be. Thanks a ton!
Posted By: RapidRobert
Re: Pinion Angle - One More Time - Please - 02/29/12 04:11 AM
Bob you want them parallel then the pinion 2-2.5 deg down from that point on a normal rubber suspension?
Posted By: bobs66440
Re: Pinion Angle - One More Time - Please - 02/29/12 05:12 AM
As long as the pinion and output shaft centerlines are parallel and there's approx 2-3 degree angle in relation to the driveshaft, it's good. But you don't want everything exactly in line for a street car.
Ideally, the angles between the transmission output shaft and driveshaft, and between the driveshaft and the pinion will be equal and opposite.
Posted By: 340SHORTY
Re: Pinion Angle - One More Time - Please - 02/29/12 06:04 AM
I always heard the the pinion should be 2 to 4 degrees down fron the tail shaft. that way under acceleration the rear axle rotates up and becomes even with the tail shaft.
Posted By: Junky
Re: Pinion Angle - One More Time - Please - 02/29/12 06:10 AM
Something came to mind. Transmission down 2.5°, pinion up 2.5°: on acceleration, won't the rear end want to climb (rotate) up more than 2.5°? And while driving, with the rear wheels propelling the car forward won't the pinion be up more than 2.5°? Will that cause a problem? Or am I over thinking this?
Edit: 340Shorty said what I've heard too. That's why I was wondering...
Posted By: DoctorDiff
Re: Pinion Angle - One More Time - Please - 02/29/12 07:47 AM
Ammount of negative pinion angle depends on the application. Too much negative angle is just as bad because the pinion swings downward while braking. Street cars usually like 2-3 degrees negative.
Posted By: bobs66440
Re: Pinion Angle - One More Time - Please - 02/29/12 11:52 AM
Quote:
Something came to mind. Transmission down 2.5°, pinion up 2.5°: on acceleration, won't the rear end want to climb (rotate) up more than 2.5°? And while driving, with the rear wheels propelling the car forward won't the pinion be up more than 2.5°? Will that cause a problem? Or am I over thinking this?
Edit: 340Shorty said what I've heard too. That's why I was wondering...
Under hard acceleration the pinion will want to climb the ring gear initially, yes but the rear is secured to the springs which will resist the action. As mentioned, under braking it's just the opposite. Under normal driving the rear will naturally pivot a little but the fact that it's bolted to the springs holds it true for the most part. Because the axle will naturally go up and down, the angles will always be changing slightly, but the initial setup is a good compromise. With leaf spring rears, traction bars are used to keep the springs from wrapping up due to the ring gear climbing which also helps to keep the pinion angle in check. For high horsepower drag cars that spend all of their meaningful time under hard acceleration, the setup will be different. The idea for a street car is to have the optimum angles for the most time as possible. With a four link, ladder bar setup or similar it's not an issue because the rear is held fast to a certain angle by the radius rods/ladder bar. In that case the pinion angle only changes when the whole axle assembly pivots up and down on the front rod mounting points, but the change is minimal in most cases.
Posted By: RapidRobert
Re: Pinion Angle - One More Time - Please - 02/29/12 03:53 PM
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As long as the pinion and output shaft centerlines are parallel and there's approx 2-3 degree angle in relation to the driveshaft, it's good.
Oh OK you want the centerlines parallel but not in the same plane like the pic AND AT THAT POINT the pinion 2-3 deg downward from the DRIVESHAFT. Cause the pinion will rise up making the pinion & the driveshaft closer to a straight line? am I understanding it right? Is this for street or drag only? or both? But A body pinion is 5 deg UP from level 
Posted By: bobs66440
Re: Pinion Angle - One More Time - Please - 02/29/12 04:20 PM
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As long as the pinion and output shaft centerlines are parallel and there's approx 2-3 degree angle in relation to the driveshaft, it's good.
Oh OK you want the centerlines parallel but not in the same plane like the pic AND AT THAT POINT the pinion 2-3 deg downward from the DRIVESHAFT. Cause the pinion will rise up making the pinion & the driveshaft closer to a straight line?
Right, when the car is on the ground and sitting with weight on the suspension, you want the rear and trans parallel but NOT on the same plane (in line) with each other. The 2-3 degree angle is in relation to the drive shaft only not to the ground. As the suspension goes up and down in normal driving, the angle will naturally change a little to the positive and negative to that angle. Most production cars have the engine in the car at a 2-3 degree angle (tail down) in relation to the level plane of the car (and ground). That's why intake manifolds are higher in the back than the front...to level the carb. Then the rear is angled 3 degrees UP to match the engine angle. In theory, the drive shaft (if installed level) will have a 3 degree angle in relation to the rear and trans on each end.
The upper right diagram is described as for tube chassis drag cars only. That will produce the least resistance. Some drag racers with leaf springs will set it up so the rear is angled down relative to the trans, so that under acceleration when the pinion climbs the ring gear, it will then have the correct agle. Then at the end of the race it will revert back to the non-aligned angle. But you wouldn't want that for the street. You will get a lot of vibration and there will be a lot of stress on the u-joints.
Posted By: RapidRobert
Re: Pinion Angle - One More Time - Please - 02/29/12 05:28 PM
got it
thank you Bob
Posted By: Junky
Re: Pinion Angle - One More Time - Please - 02/29/12 06:21 PM
Bob, your explanation is the best for me to understand. And I've done a ton of searching on here and on the web. Your diagram, top left one, answered my question perfectly. Never seen a diagram like that one. Never found any explanations for my situation. Everything that I read said the pinion should be negative. I didn't think that was right in my situation. Thanks!
Posted By: 383man
Re: Pinion Angle - One More Time - Please - 02/29/12 10:40 PM
Quote:
Something came to mind. Transmission down 2.5°, pinion up 2.5°: on acceleration, won't the rear end want to climb (rotate) up more than 2.5°? And while driving, with the rear wheels propelling the car forward won't the pinion be up more than 2.5°? Will that cause a problem? Or am I over thinking this?
Edit: 340Shorty said what I've heard too. That's why I was wondering...
That is wrong with the trans down 2.5 and the pinion up 2.5. That would be 0 pinion angle. You want a difference of 2 to 3 degrees down so when the pinion wants to go upward on acceleration it goes closer to 0 but not 0 as you want some angle so the U-joints will work and move the lube around in them. If you had a trans say 2 down you would want the pinnion 4 or 5 down for 2 to 3 down pinion angle. Ron
Posted By: Rick_Ehrenberg
Re: Pinion Angle - One More Time - Please - 02/29/12 11:21 PM
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OK, I raised the Coronet up on a 4 post hoist. <snip...>
NO. The car must be supported by the suspension (rear at least) or the measurements are meaningless.
I've always liked the factory direct-reading tool which doesn't "care" if the car is level or not (but paragraph above still applies).
Drag cars with leaf springs an no other windup control typically need pinion down 3-4° (in relation to the propshaft).
True street cars will be much happier with 1° or so.
Front angle should be a very small amount "shaft down", but not zero (some movement prevents grease from becoming rock hard!)
Rick
Posted By: Junky
Re: Pinion Angle - One More Time - Please - 03/01/12 01:22 AM
Here we go again. Pinion up, no down, no up...down...up...
The trans is down, so the pinion goes up to be parallel. If the trans is down and the pinion is down it can't be parallel. Or is that wrong, right, wrong...right...
Rick, the suspension was loaded. It's a 4 post lift/hoist, what ever it's called.
Posted By: bobs66440
Re: Pinion Angle - One More Time - Please - 03/01/12 02:07 AM
When they say pinion "nose down", it means in relation to the drive shaft. If the trans is higher than the axle, then the pinion will be "nose down" in relation to the axle, but the trans and pinion should still be parallel (see diagram).
With your car set up with the suspension loaded as you have (on your 4 post lift is ok) use an angle finder to get the angle of the centerline of the output shaft on the trans. Then use the angle finder on the pinion of the rear and match that angle, but make it OPPOSITE on the same plane as in the diagram. Now, if you attach the drive shaft and measure the difference in the angle between the driveshaft and the pinion or trans, it should be 2-3 degrees. Some people say as little as 1 degree and as much as 7 degrees is ok. I believe most u-joints have a max working angle of 3.5 degrees and min of .5 degrees, so I would keep it in that range.
Here's a good tutorial explaining the whole thing. Sometimes I don't explain things very well, but if you follow this, you will be fine.
http://www.hurst-drivelines.com/files/Universal_Joint_Alignment_Proc_111606.pdfAs stated in above posts, there are many theories and one (for drag cars) is to have the pinion 1 or 2 degrees lower than what's described above so that when the pinion climbs the ring gear it will then be lined up properly.
Posted By: 383man
Re: Pinion Angle - One More Time - Please - 03/01/12 07:25 AM
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Something came to mind. Transmission down 2.5°, pinion up 2.5°: on acceleration, won't the rear end want to climb (rotate) up more than 2.5°? And while driving, with the rear wheels propelling the car forward won't the pinion be up more than 2.5°? Will that cause a problem? Or am I over thinking this?
Edit: 340Shorty said what I've heard too. That's why I was wondering...
That is wrong with the trans down 2.5 and the pinion up 2.5. That would be 0 pinion angle. You want a difference of 2 to 3 degrees down so when the pinion wants to go upward on acceleration it goes closer to 0 but not 0 as you want some angle so the U-joints will work and move the lube around in them. If you had a trans say 2 down you would want the pinnion 4 or 5 down for 2 to 3 down pinion angle. Ron
I am sorry as I was wrong here. I was thinking the trans was the driveshaft angle and thats why I said it was wrong. I thought it was saying the driveshaft and the pinion were both 2.5 when they ment the trans was 2.5 and the pinion also 2.5 which is correct. Then you would have to measure the driveshaft angle to see what that is. If the driveshaft measures 4.5 up then the pinion angle would be 2. Ron
Posted By: DAYCLONA
Re: Pinion Angle - One More Time - Please - 03/01/12 10:06 AM
.....
Posted By: DAYCLONA
Re: Pinion Angle - One More Time - Please - 03/01/12 10:12 AM
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OK, I raised the Coronet up on a 4 post hoist. <snip...>
NO. The car must be supported by the suspension (rear at least) or the measurements are meaningless.
I've always liked the factory direct-reading tool which doesn't "care" if the car is level or not
Rick
A 4 post lift is a "drive on" ramp style lift, the suspension is compressed.......
Posted By: Junky
Re: Pinion Angle - One More Time - Please - 03/01/12 04:12 PM
383man, you're forgiven.
To all. I'm gonna follow Bob's advise and go with 2° nose up (positive) or as close to that as I can.
Thanks again, Bob.
Posted By: bobs66440
Re: Pinion Angle - One More Time - Please - 03/01/12 05:52 PM
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383man, you're forgiven.
To all. I'm gonna follow Bob's advise and go with 2° nose up (positive) or as close to that as I can.
Thanks again, Bob.
Just to be clear, you want to make sure the pinion is at the SAME angle as the output shaft. It isn't necessarily nose up or down. That depends on whether the trans is higher in the car than the rear, which most are. The 2 degree angle is measured compared to the DRIVE SHAFT. If that's the case then the pinion will be nose DOWN in relation to the drive shaft. In any case as long as you keep both at the same angle and there's a 2 degree or so angle where the u-joints are, you should be good to go.
FOLLOW THE TUTORIAL IN THIS LINK. It explains it better than I can.
http://www.hurst-drivelines.com/files/Universal_Joint_Alignment_Proc_111606.pdf
Read through it so you understand it.
Posted By: patrick
Re: Pinion Angle - One More Time - Please - 03/01/12 06:09 PM
Cass (Dr Diff has it right)....pinion angle is in relation to the tranny output shaft. for a street car, measure the output shaft of the tranny. then measure the pinion. make them parallel, then roll the pinion down about 2 degrees, so they're parallel when the car is under power. driveshaft angle is incidental, as long as it's not in line with the tranny output or pinion.
so if the tranny is say, 3 degrees nose down to the world, the pinion needs to be 3 degrees nose up to the world to be parallel. Then it needs to be rolled down about 2 degrees, so the pinion is 1 degree nose up to the world, so it's 2 degrees nose down to the tranny.
Posted By: DoctorDiff
Re: Pinion Angle - One More Time - Please - 03/01/12 06:29 PM
Yes. Static pinion angle on most stock, original cars is around 2 degrees negative. In other words, the pinion centerline points 2 degrees downward relative to the transmission centerline at rest.
This allows the pinion to run parallel with the transmission as the pinion winds up a tad under cruise.
Posted By: bobs66440
Re: Pinion Angle - One More Time - Please - 03/01/12 06:42 PM
Quote:
Yes. Static pinion angle on most stock, original cars is around 2 degrees negative. In other words, the pinion centerline points 2 degrees downward relative to the transmission centerline at rest.
This allows the pinion to run parallel with the transmission as the pinion winds up a tad under cruise.
If this is the case, then why does every tech article and diagram including all the ones posted here state to make the (static) center lines parallel (excluding drag car setups)? I can understand why you would want to do it on a drag car because it's always under acceleration. But a street car isn't always accelerating. Sometimes it's coasting or cruising with little or no load, in which case the nose down setup would cause a vibration. Sometimes it's braking which would make it even worse.
Posted By: DoctorDiff
Re: Pinion Angle - One More Time - Please - 03/01/12 07:10 PM
All tech articles definitely do not agree on how to set pinion angle.
Ideally, you want the pinion and transmission parallel under cruise, because that is where a street cars spends most of its driving time.
The pinion is not static under cruise. Torque rotates it upward a couple degrees.
If you don't believe me, you can measure a stock pinion angle.
Posted By: 67Satty
Re: Pinion Angle - One More Time - Please - 03/01/12 07:22 PM
Not to hijack, but I measured my pinion angle. I found that I am 2 degrees up on the pinion and 2 degrees up on the driveshaft/trans for a total of 4 degrees positive.
The Mopar Performance Chassis book says the pinion angle should be 5 to 7 degrees negative. But that's for a drag-only car I guess.
I've got a street/strip car with Superstock springs. I ordered a pair of 4 degree shims. By my calculations that should get me down to 4 degrees negative (a 2 degree shim would get me to 0, so another 2 degrees would get the pinion down 2 degress plus the driveshaft down 2 degrees for 4 degrees down total). Is that a good compromise for a street/strip car? I've been researching this online and have been coming up with the recommendation of 4 degrees negative a lot. Some will even recommend various amounts of negative pinion angle for various amounts of horsepower. Like 4 degrees down for cars in the 400 HP range and more towards the 7 degrees down end for higher HP like 700 HP and up. Is my math correct? Thanks!
Posted By: bobs66440
Re: Pinion Angle - One More Time - Please - 03/01/12 07:51 PM
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Ideally, you want the pinion and transmission parallel under cruise, because that is where a street cars spends most of its driving time.
The pinion is not static under cruise. Torque rotates it upward a couple degrees.
Ok, I wasn't aware that it rotated and held there during cruise. I assumed that the springs or radius rods (or whatever is holding the rear in place) would counteract that motion after the initial torque from accelerating had dissipated. Of course, we're only talking a couple of degrees which isn't much. You learn something new every day.
Posted By: patrick
Re: Pinion Angle - One More Time - Please - 03/01/12 08:30 PM
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Not to hijack, but I measured my pinion angle. I found that I am 2 degrees up on the pinion and 2 degrees up on the driveshaft/trans for a total of 4 degrees positive.
The Mopar Performance Chassis book says the pinion angle should be 5 to 7 degrees negative. But that's for a drag-only car I guess.
I've got a street/strip car with Superstock springs. I ordered a pair of 4 degree shims. By my calculations that should get me down to 4 degrees negative (a 2 degree shim would get me to 0, so another 2 degrees would get the pinion down 2 degress plus the driveshaft down 2 degrees for 4 degrees down total). Is that a good compromise for a street/strip car? I've been researching this online and have been coming up with the recommendation of 4 degrees negative a lot. Some will even recommend various amounts of negative pinion angle for various amounts of horsepower. Like 4 degrees down for cars in the 400 HP range and more towards the 7 degrees down end for higher HP like 700 HP and up. Is my math correct? Thanks!
no, driveshaft really has nothing to do with pinion angle. it's the relationship of the tranny output shaft to the pinion that's important. as Dr. Diff said, for a street car, 2 degrees nose down relative to the tranny output shaft is good for a street car
Posted By: Junky
Re: Pinion Angle - One More Time - Please - 03/01/12 09:44 PM
I think I got it. So my slip yoke is negative 2.5° then my pinion should be positive 0.5°.
2.5° minus 2° = positive 0.5°
If that ain't right I'm gonna freakin shoot myself and get it over with.
Posted By: Kern Dog
Re: Pinion Angle - One More Time - Please - 03/01/12 09:45 PM
Could I get this explained again?
Posted By: RapidRobert
Re: Pinion Angle - One More Time - Please - 03/01/12 09:47 PM
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as Dr. Diff said, for a street car, 2 degrees nose down relative to the tranny output shaft is good for a street car
OK so if the trans is 2 deg down from level you'd want the pinion 2 deg up (parallel) plus the 2 deg nose down added in that you mentioned for a total of zero (level) for the pinion? or were you saying pinion 2 deg further down than the trans say if the trans is 2 deg down then you'd want the pinion 4 deg down?
Posted By: 383man
Re: Pinion Angle - One More Time - Please - 03/01/12 09:52 PM
Its no wonder so many get confused about pinion angle when you read some of the article's about it. Some talk about the driveshaft angle and has many thinking the pinion should be 2 less then the driveshaft angle. The one article posted says to leave the trans and pinion the same as he states that where he prefers street cars to be. But really as Dr Diff says its very simple. Dont worry about the driveshaft angle just check the eng,trans angle which you could measure at the trans output shaft yoke and then measure the pinion angle which can be checked at the pinion yoke. Just make sure you are on the yokes and not the driveshaft. So you check the trans and pinion angle then just set the pinion 2 degrees down from the trans and you are done. Ron
Posted By: RapidRobert
Re: Pinion Angle - One More Time - Please - 03/01/12 09:57 PM
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So you check the trans and pinion angle then just set the pinion 2 degrees down from the trans and you are done. Ron
Ron if my trans is 2 deg down and the pinion is 4 deg down I'm good? EDIT & forget about the parallel in diff planes info
Posted By: DAYCLONA
Re: Pinion Angle - One More Time - Please - 03/01/12 10:58 PM
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Could I get this explained again?
Second or third time around it's not "explained" anymore,...it becomes "splain it agin plez".... 
Posted By: 383man
Re: Pinion Angle - One More Time - Please - 03/01/12 11:01 PM
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So you check the trans and pinion angle then just set the pinion 2 degrees down from the trans and you are done. Ron
Ron if my trans is 2 deg down and the pinion is 4 deg down I'm good? EDIT & forget about the parallel in diff planes info
No actually if the trans is 2 down the pinion would be 2 up to have the same level centerline as the trans and then go 2 down on the pinion from there which would be 0. Ron
Posted By: Junky
Re: Pinion Angle - One More Time - Please - 03/02/12 01:45 AM
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So you check the trans and pinion angle then just set the pinion 2 degrees down from the trans and you are done. Ron
Ron if my trans is 2 deg down and the pinion is 4 deg down I'm good? EDIT & forget about the parallel in diff planes info
No actually if the trans is 2 down the pinion would be 2 up to have the same level centerline as the trans and then go 2 down on the pinion from there which would be 0. Ron
Far out. I don't have to shoot me.
Posted By: RapidRobert
Re: Pinion Angle - One More Time - Please - 03/02/12 06:02 AM
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No actually if the trans is 2 down the pinion would be 2 up to have the same level centerline as the trans and then go 2 down on the pinion from there which would be 0. Ron
Thank you Ron, I'm grasping it now. It amazes me that something this simple can be that confusing 
Posted By: bobs66440
Re: Pinion Angle - One More Time - Please - 03/02/12 01:26 PM
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No actually if the trans is 2 down the pinion would be 2 up to have the same level centerline as the trans and then go 2 down on the pinion from there which would be 0. Ron
Thank you Ron, I'm grasping it now. It amazes me that something this simple can be that confusing
I think a lot of the confusion comes in because a lot of this is based on theory. I would imagine that many of cars like ours that have been modified so many times over the years by God knows who, are running around with screwed up configurations without the driver even knowing it. When you are talking 1 or 2 degrees, it probably goes unnoticed because of natural vibrations from an old car, monster motors, etc. If someone sets a suspension up slightly wrong, drives it and it feels ok, then it becomes gospel in his mind. My opinion is that if you get the setup within a degree or two plus or minus, most people will not notice a difference.
Apparently, you have half of the guys setting it up perfectly parellel, and the other half setting it up 2 degrees down, and they're all happy with it...it must not make much difference. Everybody's correct.
Posted By: patrick
Re: Pinion Angle - One More Time - Please - 03/02/12 01:51 PM
Quote:
I think I got it. So my slip yoke is negative 2.5° then my pinion should be positive 0.5°.
2.5° minus 2° = positive 0.5°
If that ain't right I'm gonna freakin shoot myself and get it over with.
correct
Posted By: patrick
Re: Pinion Angle - One More Time - Please - 03/02/12 01:53 PM
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as Dr. Diff said, for a street car, 2 degrees nose down relative to the tranny output shaft is good for a street car
OK so if the trans is 2 deg down from level you'd want the pinion 2 deg up (parallel) plus the 2 deg nose down added in that you mentioned for a total of zero (level) for the pinion? or were you saying pinion 2 deg further down than the trans say if the trans is 2 deg down then you'd want the pinion 4 deg down?
correct. if your tranny output is 2 degrees nose down, for a -2 pinion angle, the pinion would be level to the world to be -2 with respect to the tranny output.
Posted By: patrick
Re: Pinion Angle - One More Time - Please - 03/02/12 01:55 PM
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So you check the trans and pinion angle then just set the pinion 2 degrees down from the trans and you are done. Ron
Ron if my trans is 2 deg down and the pinion is 4 deg down I'm good? EDIT & forget about the parallel in diff planes info
no. if your trans if at -2, the pinion needs to be +2 to have 0 pinion angle. if your trans is -2 and your pinion is -4, your pinion angle is -6.
Posted By: Junky
Re: Pinion Angle - One More Time - Please - 03/02/12 06:09 PM
I'm gonna put all this in to my words.
If the transmission slip yoke is down (negative), pinion goes up (positive). Transmission slip yoke up, pinion goes down. Either way make them parallel to each other, but opposite. Forget the driveline, only look at what the trans slip yoke and the rear end pinion are to each other.
In my case it's slip yoke down 2.5°, pinion should go up 2.5° minus 2° for a total of 0.5° nose up for the pinion.
All the different explanations I've read over the months never explained it like this. Unreal.
Thank you very much to all of you for the input. What would I do without Moparts?!
Posted By: patrick
Re: Pinion Angle - One More Time - Please - 03/02/12 06:40 PM
Quote:
I'm gonna put all this in to my words.
If the transmission slip yoke is down (negative), pinion goes up (positive). Transmission slip yoke up, pinion goes down. Either way make them parallel to each other, but opposite. Forget the driveline, only look at what the trans slip yoke and the rear end pinion are to each other.
In my case it's slip yoke down 2.5°, pinion should go up 2.5° minus 2° for a total of 0.5° nose up for the pinion.
All the different explanations I've read over the months never explained it like this. Unreal.
Thank you very much to all of you for the input. What would I do without Moparts?!
you got it!
Posted By: Junky
Re: Pinion Angle - One More Time - Please - 03/02/12 08:51 PM
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I'm gonna put all this in to my words.
If the transmission slip yoke is down (negative), pinion goes up (positive). Transmission slip yoke up, pinion goes down. Either way make them parallel to each other, but opposite. Forget the driveline, only look at what the trans slip yoke and the rear end pinion are to each other.
In my case it's slip yoke down 2.5°, pinion should go up 2.5° minus 2° for a total of 0.5° nose up for the pinion.
All the different explanations I've read over the months never explained it like this. Unreal.
Thank you very much to all of you for the input. What would I do without Moparts?!
you got it!
