I swapped out the 3.90 gear center chunk out for the 3.54 gear center chunk and it dropped 500 RPMs. Instead of running 3000 RPMs at 60 MPH its at 2500 RPMs at 60 MPH. It's not great but way better. I believe maybe someone changed some gearing inside the R5M21 trans I got out of my 1994 Mighty Max. I never drove the 1994 MM that it came out of so I wouldn't know. I thought it would run at 2000 RPMs at 60 MPH at least but I'm not sure just wondering.

Anyone can verify me what RPMs the truck should be at 60 MPH please. I would appreciate it.