When my 94 Buick is cold and I put in it in drive or reverse it bumps, but won't go forwards or reverse for about 10 to 15 minutes, till it warms up. Then once warmed up it goes into gear and works perfectly until it cools down, then same over again. I changed fluid and filter and no difference. What do I do?
By Richard from Huntsville, AL
Let it warm up. Might need bands tightened. But since it's a 94 might just be age.
I have the same issue with on a 1994 Lesabre and have done some pretty extensive research on this issue.
This is a very common issue on all 4T60e transmissions, often referred to as "morning sickness". These transmissions are pretty weak and you can't expect them to last more than about 150k miles.
The issue in question is related to a bad seal that doesn't allow the transmission to gain enough pressure at cold temps. Once the transmission has warmed up the seal expands and allows enough pressure to build up.
Unfortunately, there is no easy / cheap fix for this. Using an additive such as Lucas Oils Stop Slip may buy you some time, it works in 2 ways by thickening your fluid and "swelling" the seals.
The downside is that an older transmission will have brittle seals and it will work for a while (could be a week, could be a year) but will eventually stop working and the seals will be worse than they were originally.
* Do NOT do a transmission flush on older transmissions!
* Only use an additive if absolutely necessary and you know your trans is on its way out!
* Be prepared for an expensive trans rebuild or replacement!
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