Disclaimer: Links on this page pointing
to Amazon, eBay and other sites may include affiliate code. If you click them and
make a purchase, we may earn a small commission.
You can get a GM adapter but it's a one year deal... 1991, I believe. I think it was for the Squarebody crewcabs. I think there is a way to modify another GM adapter to work, Though... this is all assuming the 4L85E is the same as the 4L80E when it comes to attaching a transfercase.