Transmission losing reverse in 2wd, but works alright in 4wd

Asked by Aug 13, 2014 at 07:26 AM about the GMC Sierra 1500

Question type: Maintenance & Repair

Have an 89 GMC 4wd pick-up with a 700r trans, that is losing reverse, in 2wd, but seems
to work alright in 4wd. Shifts alright, in forward gears. Fluid looks good, and is full. What
could be the problem ?

2 Answers

34,655

Have aamco scan the transmission computer. Could be something simple.

20

Has the transmission filter ever been replaced? They are fairly cheap and you can do it yourself easily enough in 30min to an hour with 0 experience

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