4l60e shifting problem
Thread Starter
On The Tree
Joined: Feb 2012
Posts: 141
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4l60e shifting problem car will run pretty normal most of the time accept when its time to shift. when it shifts it feels like somethings off. sometimes it shifts nice and early at low rpm like it should and other times it will take a few seconds longer then it should. Wont shift at WOT from 1-2 and from 2-3, and other times it will shift fine. Drove it to the drag strip to get a baseline for the car (40 min drive) and everytime i went down the track it would not shift. took it to the trans shop and the guys there said it was fine. its a 94 z28 lt1 bone stock from what the previous owner told me accept for a CAI and a cat delete in the exhaust. what are the things i should be checking and looking into? also when i was at the track i should mention that it just didnt shift and i was hitting the rev limiter
Moderator
Joined: Aug 2010
Posts: 7,322
Likes: 528
From: Ann Arbor, MI
If it is not shifting at WOT, then either the torque converter or the clutches are slipping.
Since you have an 18 year old trans and the early 4L60E were not very sturdy to begin with, it is likely simply worn out and time for a rebuild.
If not ready for that, make sure your fluid is full when the trans is hot and has been changed in the last 25,000 miles.
Since you have an 18 year old trans and the early 4L60E were not very sturdy to begin with, it is likely simply worn out and time for a rebuild.
If not ready for that, make sure your fluid is full when the trans is hot and has been changed in the last 25,000 miles.
Registered User
Joined: May 2012
Posts: 12
Likes: 0
From: Kankakee, IL
ZZ is right it could be time for a new build, if you know anyone with a computer that you can look at the data with you can see if the computer is commanding a 1-2 and 2-3 gear shift or not, this will tell you if it is a transmission problem or computer problem
Thread Starter
On The Tree
Joined: Feb 2012
Posts: 141
Likes: 0
went out and smelled the fluid it smells pretty burnt out. going to try that first and hope for the best. i took the car to the trans shop tho and the trans guy said it was shifting fine and that it maybe a pcm problem
Moderator
Joined: Aug 2010
Posts: 7,322
Likes: 528
From: Ann Arbor, MI
There are a lot of threads here about people installing a higher-stall converter and then with WOT hit readline before shift. That is nearly always indicates the need for a PCM tune. But if you changed nothing, then retuning the PCM is just a bandaid.
