Sm465

[tc4x4]

On the topic of transmissions, I have the 4 speed with the granny gear. I beleive its the sm465.

The SM465 is heavy-duty truck transmission is used in light duty and heavy duty trucks. The SM465 was made by General Motors from 1968 to 1991. The SM465 can be found in Chevrolet and GMC full-size trucks, Blazers, Suburbans among other models

The "SM" in the transmission's designation stands for Synchro-Mesh.

Gear Ratios are:

First Gear - 6.55:1
Second Gear - 3.58:1
Third Gear - 1.70:1
Fourth Gear - 1.00:1
Reverse - 6.09:1

I think I have 4.10 gears also, when I'm cruising My rpms are revved pretty high. I'm considering while I have the axle opened up changing to something like 3.73 gears.

Would this make a big difference for cruising?