There's very little difference in RPM between the older torque tube 4.10 and a 3.90. I don't know if anyone has ever mated up a torque tube axle with a T-5, but it seems like it wouldn't be terribly difficult to accomplish. IMHO, the torque tube rears were usually 4.10, weren't they? Drop me a PM about the 58 GMC axle I've got that's looking for a home. I believe it's a 3.90.
Jerry
I think you’re right about the torque tube ratio. I strongly suspect I have “numerically lower” than 3.90 gears currently. Need to just get under the truck and verify.
Will do on the PM. I was wondering if you still had it.
