Now drive shaft angle
#2458988
02/28/18 05:53 PM
02/28/18 05:53 PM
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Joined: Aug 2007
Posts: 2,356 Kentucky
dfsmopars
OP
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OP
top fuel
Joined: Aug 2007
Posts: 2,356
Kentucky
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I’m close but let’s see what you all think. Trans angle- 4.5* down from front to back (measured on end of output shaft, crank bolt shows engine at 2.5* down in back) Rear pinion angle- 4.1* down in the nose Trans output shaft 2” higher than rear pinion This calculates to about 0.5* drive shaft angle. The trans/drive shaft angle about 4.0*. The pinion/drive shaft angle about 4.6*.
‘72 Charger, 5.9 Magnum, Tremec 5 spd., Pro-Touring ‘14 Big Horn, Quad Cab, 4x4, 1500
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Re: Now drive shaft angle
[Re: dfsmopars]
#2459107
02/28/18 10:41 PM
02/28/18 10:41 PM
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Joined: Dec 2009
Posts: 20,640 in a cattle trailer down by th...
Guitar Jones
Paddle faster! I hear banjo music!
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Paddle faster! I hear banjo music!
Joined: Dec 2009
Posts: 20,640
in a cattle trailer down by th...
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Oh man, I love a good pinion angle thread. So just to get the ball rolling you didn't mention what kind of suspension you are working on.
"Follow me the wise man said, but he walked behind"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion. '74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost conversion. 2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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Re: Now drive shaft angle
[Re: Cab_Burge]
#2459192
03/01/18 12:45 AM
03/01/18 12:45 AM
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Joined: Jul 2011
Posts: 959 Chicago
PurpleBeeper
super stock
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super stock
Joined: Jul 2011
Posts: 959
Chicago
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I don't give a hoot about the trans output shaft angle, as long as the front U joint is not aligned perfectly with it that is Which from your description it is not I look hard at the angle between the pinion shaft and the rear of the drive shaft angle, I like to see a V at the pinion yoke with 2 to 7 degrees difference with the pinion pointed down towards the ground or parallel to the ground , not pointed up towards the tranny yoke IHTHs This is what I've always done too, but more like 2-4 degrees "V" for me in back & also, no exactly straight from u-joint angle like Cab mentioned, all for leaf spring suspension.
Last edited by PurpleBeeper; 03/01/18 12:46 AM.
70 Roadrunner convt. street car
440+6, NOS, 4-spd, SS springs
'96 Mustang GT convt. street car
'04 4.6 SOHC, NOS, auto, lowered
"Officer, that button is for short on-ramps"
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Re: Now drive shaft angle
[Re: dfsmopars]
#2459202
03/01/18 12:58 AM
03/01/18 12:58 AM
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Joined: Aug 2007
Posts: 2,356 Kentucky
dfsmopars
OP
top fuel
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OP
top fuel
Joined: Aug 2007
Posts: 2,356
Kentucky
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Yes leaf spring. Suspension loaded. Angle finder on front of pinion. I appreciate the hard work going on here. What throws curves into things is the axle has been lowered two inches.
‘72 Charger, 5.9 Magnum, Tremec 5 spd., Pro-Touring ‘14 Big Horn, Quad Cab, 4x4, 1500
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Re: Now drive shaft angle
[Re: dfsmopars]
#2459757
03/02/18 02:16 AM
03/02/18 02:16 AM
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Joined: Aug 2007
Posts: 2,356 Kentucky
dfsmopars
OP
top fuel
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OP
top fuel
Joined: Aug 2007
Posts: 2,356
Kentucky
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Ok let’s try this. The angle finder used is digital. It compensates for opposite facing surfaces. I would not put a lot of stock in the crank angle because it was coming off the bolt head. The best numbers are out put shaft and pinion. The pinion is definitely nose down over 4*. I shimmed up the tail shaft and reduced that angle of trans to less than 3*. The driveshaft has been ordered based on the trans joint angle will be around 2*. The pinion angle is now closer to 6.5*. The trans is clear up into the tunnel and cannot go any farther without interference. HIt looks right.
‘72 Charger, 5.9 Magnum, Tremec 5 spd., Pro-Touring ‘14 Big Horn, Quad Cab, 4x4, 1500
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Re: Now drive shaft angle
[Re: dfsmopars]
#2459789
03/02/18 05:46 AM
03/02/18 05:46 AM
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Joined: Aug 2003
Posts: 43,228 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,228
Bend,OR USA
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In the future you can use your angle finder on the end of thetranny output shaft if you want to know that angle On finding the pinion angle on machined pinion yokes you can turn it so the outside edge of the pinion yoke is aligned with the ground and use that surface to find that angle I measure the pinion angle their and the driveshaft angle on the bottom side of the driveshaft so I have the zero degrees on the angle finder pointed upwards and go from there, one of the older units I have has 90 degrees straight up and measure the same numbers both ways from straight up When I would use that one a long time ago I would add or subtract the two angles to get the total differences, IE 88 degrees on the driveshaft and 93 degrees on the pinion shaft angle, subtract 88 from 93 for five degrees difference If I used that angle finder on top it would read 88 one way and 87 the other way so I had to add the differences from 90 degrees to get the total angle, 87 subtracted from 90=3, + 88-90=2, add 2+3=5 Remember that between 3 and 7 degrees difference on a leaf spring car, no Cal Tracs or any other traction bar systems like that, your good. I did set one of my old street automatic cars up with 7 degrees and it would make driveshaft noise(rear u joint to much down angle when deacceleration, when I let off on the other end I ended adding a 2 degree shim on the front side of the springs to reduce the angle to 5 degrees difference and that made that noise go away Another way is to measure off the U joint caps on the Detroit type U joints from the bottom of each one pointed straight down, you do need the car on jack stands under the rear end housing so the chassis is loaded like it is on the ground so you can rotate the driveshaft to measure off both the pinion cap and driveshaft caps
Last edited by Cab_Burge; 03/02/18 05:49 AM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Now drive shaft angle
[Re: dfsmopars]
#2459805
03/02/18 08:40 AM
03/02/18 08:40 AM
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Joined: Aug 2007
Posts: 2,356 Kentucky
dfsmopars
OP
top fuel
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OP
top fuel
Joined: Aug 2007
Posts: 2,356
Kentucky
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I don’t have the drive shaft yet. This is all in prep to obtain the length and order it. I am converting this car from an A/T to a manual.
Ron, I do have the tech article from a long time ago. Thanks. Just not having the drive shaft yet was different challenge.
This is actually the second conversion on this car. It was originally a 318/904 combo and I converted it to a 5.9 Mag/A500. Got bored with that and now I am converting it to a TKO600.
I appreciate everyone’s input. It’s a big help.
‘72 Charger, 5.9 Magnum, Tremec 5 spd., Pro-Touring ‘14 Big Horn, Quad Cab, 4x4, 1500
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