Transmission/Rear end angle?
Registered User
Joined: Jan 2014
Posts: 350
From: Camdenton, MO
The engine/trans angle can be checked off the trans yoke with an angle finder, but using the front crank pulley is usually easier.
The diff is best checked from the input pinion yoke. Oh yeah, you need to check these when the car is on all 4 tires, these old frames flex a lot.
There are a lot of online resources in setting these, but generally aim for equal and opposite angles between the engine and trans with the driveshaft within 3 degrees.
You adjust the trans/engine by moving the trans mount up or down. The diff angle is typically adjusted by upper control arms.
The diff is best checked from the input pinion yoke. Oh yeah, you need to check these when the car is on all 4 tires, these old frames flex a lot.
There are a lot of online resources in setting these, but generally aim for equal and opposite angles between the engine and trans with the driveshaft within 3 degrees.
You adjust the trans/engine by moving the trans mount up or down. The diff angle is typically adjusted by upper control arms.
Last edited by garys 68&72; Mar 22, 2014 at 06:30 AM.
Thread Starter
Registered User
Joined: Feb 2009
Posts: 11,909
From: Brazil Indiana
Thanks guys, I was not googling the correct key words. I found some info. My biggest question now is, does the rear end change angle in it's travel? I just have the chassis and no body on it. If the angle changes i need to check it after it is at ride height.
Registered User
Joined: Jan 2014
Posts: 350
From: Camdenton, MO
The pinion angle can change through the travel depending on the upper/lower control arm geometry. The driveshaft definitely will.
Check it after the body is on and everything finished. Even the weight of the body causing the frame to flex will affect it. It's not hard to swap out the fixed uppers with adjustable ones later if needed.
Check it after the body is on and everything finished. Even the weight of the body causing the frame to flex will affect it. It's not hard to swap out the fixed uppers with adjustable ones later if needed.
Rodney
Joined: Jun 2011
Posts: 2,591
From: Houston, TX
Gary:
In principle, I understand how you could use an angle finder with the adjustable upper arms to set the pinion angle, but how do balance the LH and RH arms to keep them the same? Do you just turn them an equal number of turns until you get to the proper angle? What would happen if one was longer than the other?
Thx!
Rodney
In principle, I understand how you could use an angle finder with the adjustable upper arms to set the pinion angle, but how do balance the LH and RH arms to keep them the same? Do you just turn them an equal number of turns until you get to the proper angle? What would happen if one was longer than the other?
Thx!
Rodney
Registered User
Joined: Jan 2014
Posts: 350
From: Camdenton, MO
You pretty much got it. Start them even at the same length as original. Then turn equal number of turns.
The rear is located by set, parallel lower control arms. The uppers are at an angle. So guessing if you get them uneven, they'll bind or offset the axle to one side.
The rear is located by set, parallel lower control arms. The uppers are at an angle. So guessing if you get them uneven, they'll bind or offset the axle to one side.
Gary:
In principle, I understand how you could use an angle finder with the adjustable upper arms to set the pinion angle, but how do balance the LH and RH arms to keep them the same? Do you just turn them an equal number of turns until you get to the proper angle? What would happen if one was longer than the other?
Thx!
Rodney
In principle, I understand how you could use an angle finder with the adjustable upper arms to set the pinion angle, but how do balance the LH and RH arms to keep them the same? Do you just turn them an equal number of turns until you get to the proper angle? What would happen if one was longer than the other?
Thx!
Rodney
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