SOURCE: 1987 chevy silverado will not go in reverse
The light issue was your computer recanizing that thare was and isue with your trans and did the service engine soon light go on when this happend.
Well it sounds like you need a new trans not cheap
SOURCE: drove my 97 chevy truck to school tried to park in
Your sun gear shell (google it) has broken in your transmission. I'm guessing you only have 1st and 3rd forward gears? I have a 98 Z-71 and have been through 3 of them. The OEM shell is junk. When you take it to the tranmission shop, tell them to replace it with a hardened shell. My local transmission shop charged about $450 (parts and labor) to change the shell only. The very first time it broke (about 65,000 miles) they went ahead and rebuilt the tranny while they had it apart. If you've never had your tranny rebuilt, I reccomend doing it while they have it apart - they probably will, too. I have the advantage of knowing my mechanic since I was born (small town). He is as honest as they come and this was his suggestion.
Since he put the hardened shell in mine, I have had no problems.
Good luck!
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