what transmision do i have

Asked by Guru2B9WR Feb 25, 2020 at 06:19 PM about the 1990 GMC Sierra 1500 C1500 SLE Standard Cab SB

Question type: Maintenance & Repair

1990 GMC Sierra 1500 what transmission , 700R , TH400 , 4L60 , 4L60E ?

1 Answer
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KenF answered 4 years ago

All three were in use then, you'll have to decode numbers stamped on a boss on the tranny casing. Some sites will help you visually ID a tranny by the pan, if you don't feel like crawling under the truck far enough to read the stamped number.

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