Hey guys, I just bought an '86 GT with a 3.4 PR swap and a 4T60 tranny. The swap was done 8 or 9 years ago by "Fiero Bob". The car runs and drives great but when taking off from a stop, anything over 1/4 throttle makes the whole car shutter and kind of jump around and not really go anywhere. While this violent shuttering is happening the engine RPMs increase as if almost free-revving but the car doesn't move forward much.
Today I replaced the automatic transmission filter and about 6 quarts (out of 7) of the fluid.
What it feels like is a loose mount making it all jump around, but the fact that the RPM's climb makes me think something internal to the transmission is bad.
Any ideas? Anything I can check before bringing it to a shop to have them look at it?
Top Line Group Automotive
-Aftermarket accessories for the Fiero
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