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1993 Fleetwood Brougham
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244 Posts
I am having the exact same problem with my 1988 Eldorado I will be anxious to see what options there are versus a $1400 tranny job. Mine also will "jump out of gear" at lower speeds.
 

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2008 SRX-V8, 1991 Eldorado
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1,542 Posts
The NorthStar utilizes the 4T80E transaxle. The 4.9L engines utilized the 4T60E transaxle. The two transaxles are similar but not at all identical. Solenoid kits are not the same or in the same location. Typically the 4T60E transaxle does not require the upgraded solenoid package.

Slip in forward gear engagement suggests that there is a lockup problem. I would normally start with a transaxle fluid change (NOT FLUSH), along with an internal inspection/cleaning. The 4T60E transaxles should throw a code when they begin to slip.
 
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