Bolt in high hump.

[Willie Makeit]

Originally Posted by Hart_Rod

What's the difference in the 81-87 floor?

Sorry but I don't know. I'm using a 4x4 bolt in hump in a 1975 GMC Sierra. The truck is on a Roadster Shop SPEC chassis and requires the additional clearance the 4X4 hump provides for the LS/4L80e.

Excellent question as AMD only shows bolt-in high hump options up to 1980 year model.

https://www.autometaldirect.com/body...t=10&mode=grid

Their complete floor pan only fits 1973-80 as well ...

https://www.autometaldirect.com/floo...y-pickup-truck