Jump to content

Recommended Posts

I recently purchased the 1988 GMC Sierra k1500 350 four-wheel drive extended cab long bed with 155.5 wheel span, I'm trying to find the engine transmission and transfer case codes to no luck the transmission gear shift says L123, can anyone help me as to figure out what I have

Link to comment
Share on other sites

Not sure if the trucks back then had RPO code stickers in the glove box like the later model trucks.


But the engine would a L05 for the 350 TBI engine. The manual transmission in the SM465. The transfer case likely has a stamping on it somewhere to tell you exactly what version they ran back then.

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...

Important Information

By using this site, you agree to our Terms of Use.