Chevy 1990' C-60 Truck

[pa-pajames]

I have just purchased a 90' C-60 Low Profile Md. Duty Truck with a 366 c.i.d. engine, 5.13 rear-end, 5-sp. man. transmission. It has had a conversion kit added to it and I use it to pull my RV.
My problem is I am running 4000 rpm at 70mph. How can I lower rpm without losing power? Has anybody got suggestions?
My Chevy Rock is sinking fast!!!!
I am an avid Chevy fan and I don't like to admit defeat.
Please help!
Pa-Pa James

 

[Craig]

You might check with a GM dealer.You might have to do a transmission swap,or go to a two speed rear axle.
Craig Hager
[email protected]