1999 Trans Am Jerking into drive and reverse
#1
1999 Trans Am Jerking into drive and reverse
I have a 99 Trans am with an automatic trans with 142,xxx miles on it
I am having an issue when shifting into D & R it shifts hard I have been trying to figure out the issue myself reading posts here and my knowledge as a mechanic but im running out of idea's and everything that I have replaced has been worn out.
I have replaced the motor and transmission mounts, both u-joints, maf sensor, map sensor, cleaned the throttle body, tps, torque rod bushing, reset the fuel trim and the fluid for the trans looks fine.
I was wondering if the new mounts could be to stiff and maybe need to be broken in I used oem style rubber bushings.
I am having an issue when shifting into D & R it shifts hard I have been trying to figure out the issue myself reading posts here and my knowledge as a mechanic but im running out of idea's and everything that I have replaced has been worn out.
I have replaced the motor and transmission mounts, both u-joints, maf sensor, map sensor, cleaned the throttle body, tps, torque rod bushing, reset the fuel trim and the fluid for the trans looks fine.
I was wondering if the new mounts could be to stiff and maybe need to be broken in I used oem style rubber bushings.
#2
Have you scanned the engine and trans for fault codes? Some stored codes will cause the PCM to rase the transmission line pressure which would cause the trans to slam into gear and harsh shifts. Scanning for codes would be the 1st place that I would look.
#4
Are the u-joints tight? Is there excessive back lash in the diff?
You could put a pressure gauge on the trans and get a line pressure reading, this would help to pinpoint if the problem is in the trans or not.
You could put a pressure gauge on the trans and get a line pressure reading, this would help to pinpoint if the problem is in the trans or not.
The following users liked this post:
Treburkulosis (06-25-2024)
The following users liked this post:
Treburkulosis (06-25-2024)
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#8
Idle sounds about right, I would say get a pressure gauge on it and see what the line pressure at idle. Also check that your trans temp sensor is working as it varies line with temp.
Stiff mounts could be issues but cant say unable to feel them, GM mounts tend to be rather squishy even new,
Stiff mounts could be issues but cant say unable to feel them, GM mounts tend to be rather squishy even new,
#9
The pressure at idle is 60 PSI
reverse pressure is 90 PSI
also the fluid level is fine and the fluid is like a brown/red more of a red tint to it and doesn't smell burnt
reverse pressure is 90 PSI
also the fluid level is fine and the fluid is like a brown/red more of a red tint to it and doesn't smell burnt
Last edited by 99TransAmK; 06-28-2024 at 07:06 AM.