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Repair guides and support for C/K pickup trucks sold by General Motors under the GMC brand, including the GMC Sierra.

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My 88 Sierra SLX

Can I take the transmission out of my 96 Yukon and install it into my 88 Sierra SLX short wide bed

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1 Answer

Will,

Those XMSNs won’t swap. The ‘88 Sierra uses a THM400 and the Yukon uses a 4L60-E. Although the bolt pattern maybe the same, the wiring harness won’t match up and the XMSN won’t shift properly.

I’d find a reputable shop that can rebuild your THM400 or clear off a spot on your bench to do it yourself. XMSN rebuilds can be tricky, however it would be a great time to add in a shift kit.

Here’s a resource for the reference:

https://www.transtar1.com/transmission-l...

Good luck!

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