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(Why did I let myself get drawn into this mess?)
Motor/transmission center line in relation to pinion center line = proper way to measure. Not too difficult, some don't get it. Some will argue till the moon turns to swiss cheese. physics says this is the proper way to cancel change in speed due to an angled joint. Run the joints ninety degrees to each other, all is good if the trans and diff are close to parallel. Some angle is needed to properly keep the joints lubed and keep the needles from flattening due to being at the same spot all the time. If the engine/trans measurement didn't matter, then the diff angle wouldn't either. Run one too far out of alignment, you get broken trans parts. I will try and load a photo.
If the trans is pointing down and the diff is pointing down, add them. If either is going a different direction, subtract the smaller angle from the larger. If both are pointing up, fix em.

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I went off the rossler chart and mine is 6 degrees down on SS springs but i think you might need a little less with caltracs.
Mick

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thanks Sport ---

Now , we also have the crowd that uses the pinion measurement and the D shaft measurement....will their results be the same numbers ?

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No, You only gave One set of numbers between the pinion and the driveshaft.

Those were 4* down Shaft and 10* Down Pinion, witch would give you a "Driveshaft /Pinion angle of 14*

I will Edit my post to include that for a perspective.

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OK, here is what i meant ---

there are people who measure the shaft and the pinion.

your method is the Trans and the pinion. correct?

here is what i mean :

skip to about 2:00

http://www.youtube.com/watch?v=i8FNgaNqS8s


notice this guy doesnt include any trans angle

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And Did You notice, he's working with a 2 piece driveshaft. He states this works on Mustangs with a 2 piece shaft from 2005 on up.


Dont get me wrong You can get by with using the driveshaft. Its just not as accurate.


In MR.Pbodies car, he built his engine/tranny driveline paralell to the pinion. He and anyone else who does the same can accurately set the pinion angle off the Shaft.

People with Unmolested drivetrains can set the pinion angle off the shaft and still not have problems. Though the accuracy of the true pinion angle wont be known. As long as your getting a negative angle reading between the two of 3* to 5* or so. The U joints will do thier job and you wont notice anything most likely.

With a modified car such as yours, I think one can see you wouldnt want to measure it off the Shaft.

Your current measurements between the shaft and pinion give you a neg/-14*


Your current measurements between the tranny centerline and pinion give you a neg/-9*


Both sets of numbers are telling you, that your pinion angle is to far negative. If your measurments are "correct"

With your combo you dont want your pinion angle set to a positive angle. On Your ride, I wouldnt use the Shaft.

If you do, You may get a Shaft Attack.

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I went off the rossler chart and mine is 6 degrees down on SS springs but i think you might need a little less with caltracs.
Mick

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using my numbers and the Rossler chart -- what do you come up with ?

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Kevin....Talked to Steve this morning...Just haul it up to Ames and put it on the rack..You guys will be done in no time!! PS...Enjoy this beautiful day we are having!

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haha ...... i was trying to get all the opinions and methods covered here so i could "pick a number "

i dont like to bother steve and jim too much - i know they are busy --they dont even have time to work on THEIR cars right now.


however.....ive never aligned this car yet..

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this thread went like i thought....



tried this tonight :
http://www.wolferacecraft.com/pinionangle.aspx


i got 5 degrees down

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Wolf only builds the fastest stock suspension cars in the country and your going to listen to them

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(Why did I let myself get drawn into this mess?)
Motor/transmission center line in relation to pinion center line = proper way to measure. Not too difficult, some don't get it. Some will argue till the moon turns to swiss cheese. physics says this is the proper way to cancel change in speed due to an angled joint. Run the joints ninety degrees to each other, all is good if the trans and diff are close to parallel. Some angle is needed to properly keep the joints lubed and keep the needles from flattening due to being at the same spot all the time. If the engine/trans measurement didn't matter, then the diff angle wouldn't either. Run one too far out of alignment, you get broken trans parts. I will try and load a photo.
If the trans is pointing down and the diff is pointing down, add them. If either is going a different direction, subtract the smaller angle from the larger. If both are pointing up, fix em.

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thats how i set mine also, i don't use the driveshaft. this is also the way Calvert recommends.

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Same here aswell

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What happens when you use that method to set the pinion angle in a car with the rearend higher than the transmission?

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With the pinion rotating upward from a DS thats going in a downward direction too the trans tailshaft i would say you'd be screwed, to me thats a + angle, unless the trans tailshaft rotated up & the rearend stayed stationary . The way i set mine, I put my trans tailshaft at 0, then i ajust the rearend nose down to where i want it, Now if i measure the -3 on the nose, & measure the downward angle on the driveshft (which still is a - angle, It could add up to -6-7, so i just ignore the driveshaft angle.

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The answer is simple.

Make the pinion parallel to the transmission as a baseline, then rotate the pinion downward 2-4 degrees and weld the perches/brackets.

Unless the vehicle is severely raised, this method works every time for applications with 2-joint driveshafts.

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