Join Date: Dec 2008
Thanked 14 Times in 14 Posts
He can't change the OD ratio as far as I know.
But if you find a rear axle from a pre 91.5 truck with a 727 trans it has 3:07 rear gears in it. This would give you around 1650 RPM at 60 MPH. 80 MPH runs in around 1900 or so.
My truck has those gear ratio's. Now for the bad news. Those gears were Dodge only. You can not get replacements from any other vender. Dodge has been out of them for about 5 years now. No other gears will fit a 3:07 housing assy without major machine work. The housing and carrier assy are 3:07 only. If you find an 3:07 axle they are not cheap most of the time.
A 3:07 axle is cheaper than a aftermarket OD is.
93 W350 w/duals, fuel pin turned, 6X.018" injectors, 4" exhaust, 3" air intake horn, HX40/16, G56 /SBC Con-OFE, 307's axles' 2" skyjacker lift, B&W flatbed