slop in driveline

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Oct 26, 2014 | 11:31 AM

wjc1947

Thread Starter

Intermediate

Joined: Aug 2014

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slop in driveline

I have an 86 pace car it seems to have excessive slop when going from park to drive or reverse also reverse to drive and vice versa. I am told it could be loose c channel bolts or u joints they seem ok , can someone pleae tell me where this C channel is and what it looks like so i can check its bolts tks. also I have a vibration in second gear only when it downshifts sometimes

Oct 26, 2014 | 11:55 AM

don hall

Safety Car

Joined: Aug 2002

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From: SANTA CRUZ CA

https://www.corvetteforum.com/forums...to-tranny.html

Oct 26, 2014 | 11:55 AM

WVZR-1

Team Owner

Joined: Sep 2003

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Quote:

Originally Posted by wjc1947

You don't mention miles but with your mentioned "slop" it's very unlikely it's C-beam bolts. I'd think it's more likely that you're going to find u-joint problems, maybe excessive pinion/ring gear back lash. There's four bolts that connect the C-beam to the rear of the transmission (2) and to the front of the differential (2), they will be very obvious when you check the drive-line again. If it is indeed the C-beam bolts there are possibly other issues as the loose bolts have likely "elongated" the holes in both the beam, the transmission extension and the differential housing.

Internal to the transmission? Maybe!

Last edited by WVZR-1; Oct 26, 2014 at 12:04 PM.

Oct 26, 2014 | 11:58 AM

Tom400CFI

Team Owner

Joined: Aug 2004

Posts: 21,543

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From: Park City Utah

C Beam connects the rear of the trans to the front of the Diff.

Pics and good read for you right HERE

Noise could also be your axle shaft U-Joints.

Last edited by Tom400CFI; Oct 26, 2014 at 12:01 PM.

Oct 27, 2014 | 02:53 AM

Cliff Harris

Race Director

Joined: Apr 2002

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From: Anaheim CA

I think you're just seeing the normal slop in a 700r4 trans, especially the earlier ones without the auxiliary valve body (changed in late 1987).

Oct 27, 2014 | 08:36 AM

tunedport85inject

Drifting

Joined: Aug 2010

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Quote:

Originally Posted by Cliff Harris

I think you're just seeing the normal slop in a 700r4 trans, especially the earlier ones without the auxiliary valve body (changed in late 1987).

i agree, if you feel a bang from P to R or from P to D and the car makes a little jump forward from P to D,this is an old lack of the early TH700r4. When you put the gear selector in D, inside valve body, the pressure build up from the trans oil pump is cushioned by the accumulator pistons.This piston has a spring (stiffness # of this spring affects accumulator "absorbing" power). Old accumulator seals,or a worn out accumulator spring or worn out accumulator bore/pin usually act this way.As told from 87 the new auxiliary valve body includes a new accumulator setup solving this issue.

Alberto-Italy

Last edited by tunedport85inject; Oct 27, 2014 at 08:39 AM.

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