transmission clunk, 2-3 shift (long) - Off-Road Forums & Discussion Groups
GM Standard IFS Trucks & SUV's All discussion of full sized IFS Trucks, SUV's to include Suburban

 
LinkBack Thread Tools Display Modes
post #1 of (permalink) Old 08-20-2001, 04:35 PM
**DONOTDELETE**
Guest
 
Posts: n/a
transmission clunk, 2-3 shift (long)

I have a 1990 K1500, 350V8 with the 700R4 transmission.
The truck has about 126000 miles on it, but the motor runs
like a top.

Here's my problem:
My transmission/driveline clunks as the 2-3 shift occurs.
This occurs at no other shift.
I have done the following to troubleshoot and/or correct
the problem:

1) ATF fluid has been changed about 5 times this month.
The pan was dropped and filter was changed at the second
ATF change. For the first three changes, Lubegard additive
(black bottle) was added in order to get rid of previous
problem of torque converter clutch (TCC) shudder. TCC shudder
was gone after the first ATF change. After suspecting the
Lubegard may have altered shift quality to produce the shift
clunk, it was discontinued for the last two fluid changes.

2) All U- joints were inspected and seem to be in good shape.

3) Rear transmission mount was replaced. Old mount was not in
too bad of shape, but the new one was installed anyway.

4) Transfer case was drained, flushed twice, and refilled with
Dexron III as per recommended literature/manuals.

5) Slipyoke on driveshaft was lubed with CV joint grease with
no effect on clunk.

I suspect that there is something internal in the transmission
that is causing harsher than normal shifting to occur. My first
theory is that an accumulator piston is sticking or that the
accumulator piston spring is worn out or broken.

The condition of the original fluid that I removed from the
transmission was such that a slight haze of metallic particulate
matter was suspended in the fluid. It did not appear to be burnt nor
did it smell burnt.

The transmission had had several filter/fluid changes since
its known history with us after 80,000 miles.

Any ideas? Is there any way a simple solution could save the unit
so that a rebuild can be delayed? All other functions of the
transmission appear to be good.

Thanks for reading this long post!!

Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Off-Road Forums & Discussion Groups forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome