Differential carrier
Thread Starter
Racer
Joined: Aug 2007
Posts: 323
Likes: 0
From: CA
Differential carrier
92 coupe.
I am still trying to see what is causing the trans tail shaft and C-Beam to lift up when I power brake it in drive. Looking in the FSM at the differential carrier, could I have bad bushings causing this??
All in put WELCOME.
Don't want to drive it the way it is.
Thanks in advance. glassman74
I am still trying to see what is causing the trans tail shaft and C-Beam to lift up when I power brake it in drive. Looking in the FSM at the differential carrier, could I have bad bushings causing this??
All in put WELCOME.
Don't want to drive it the way it is.Thanks in advance. glassman74
Corvette Enthusiast
Joined: Oct 2007
Posts: 6,793
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From: So. Cal.
2025 C7 of the Year Finalist- Unmodified
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Hey Glassman
Maybe support the tranny and check bolts with no weight on them ? See if too much clearence there?
Good luck
Your neighbor.
Mike
Maybe support the tranny and check bolts with no weight on them ? See if too much clearence there?
Good luck
Your neighbor.
Mike
Le Mans Master
Joined: Jul 2007
Posts: 5,043
Likes: 8
From: Tampa Florida
Not likely that this is a bushing issue but it is not unheard of for the transmission tail housing extensions to crack.
The thing is going to move a little bit no matter what (force placed on the rear drive components - equal and opposite reaction deal once the engine loads up the rear end) but the movement should not be excessive - even while power braking.
I think if it were me I'd take a look to see if there is a gap between the c beam and trany bolt up points - like Mike suggested. If there was still an issue I'd pull the front C beam mounting hardware and ensure that the correct hardware (diameter & thread length) was installed. Take a look at the C beam's hardware holes to ensure they are not broken, elongated or wallowed out and do the same for the transmission's tail shaft housing where the C beam bolts to it. If all that stuff looked good then I'd look into getting some of those magic "beam plates" to see if those help the situation.
The thing is going to move a little bit no matter what (force placed on the rear drive components - equal and opposite reaction deal once the engine loads up the rear end) but the movement should not be excessive - even while power braking.
I think if it were me I'd take a look to see if there is a gap between the c beam and trany bolt up points - like Mike suggested. If there was still an issue I'd pull the front C beam mounting hardware and ensure that the correct hardware (diameter & thread length) was installed. Take a look at the C beam's hardware holes to ensure they are not broken, elongated or wallowed out and do the same for the transmission's tail shaft housing where the C beam bolts to it. If all that stuff looked good then I'd look into getting some of those magic "beam plates" to see if those help the situation.
Race Director
Joined: Sep 2001
Posts: 14,665
Likes: 749
From: NEwhere Ohio
are you sure your 4 c-beam bolts are as tight as humanly possible?
the 2 on the tailshaft side and the 2 on the diff side.
The chilton's manual torque specs are not adequete. I had my shifter lift up and down on me when accelerating/decelerating after I did a clutch change.
Id also use zfdoc's beam plates while im at it (that way you wont have to keep a wrench cocked on the top ).
Also, a catch 22, dont want to tighten the tailshaft ones too much. Ive heard of tailshaft housing cracks (and oil leaks)
the 2 on the tailshaft side and the 2 on the diff side.
The chilton's manual torque specs are not adequete. I had my shifter lift up and down on me when accelerating/decelerating after I did a clutch change.
Id also use zfdoc's beam plates while im at it (that way you wont have to keep a wrench cocked on the top ).
Also, a catch 22, dont want to tighten the tailshaft ones too much. Ive heard of tailshaft housing cracks (and oil leaks)
Melting Slicks
Joined: Jan 2009
Posts: 3,482
Likes: 196
From: folsom california
in my experience, the mounting holes in the C beam (support beam in GM speak) become elongated through wear and the whole structure moves around. apparently this was not unanticipated by the factory since they used an adhesive in addition to the mounting bolts.
the adhesive I used was "liquid nails"; plus beam plates (I made my own).
the real cure is to find either a new, or a used, but undamaged beam, or repair the beam you have.
the adhesive I used was "liquid nails"; plus beam plates (I made my own).
the real cure is to find either a new, or a used, but undamaged beam, or repair the beam you have.
