mr93wangler Posted December 24, 2012 Report Share Posted December 24, 2012 I have a 91 3.1 lumina with a 4t60 trans. Here lately ive got a issue with the trans shifting back to first gear. Fluid and filter have been changed. Im the second owner it has 140k on it. If i shift to neutral then drive or pull it into first then it goes. Otherwise it wont go back. It seems as if its in neutral. Also the vss is causing issues w the speedometer. It causes a ten mph sway in the needle. Any help would be great thanks Quote Link to comment Share on other sites More sharing options...
Dark Ride Posted December 24, 2012 Report Share Posted December 24, 2012 VSS could be complicating issues, although the 4T60s were not controlled by the ECM, other than TCC lockup which wouldn't be the issue here. Was the fluid burnt when changed? Quote Link to comment Share on other sites More sharing options...
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