3.07

[W4MGB]

How do i change the 3.9 ratio MGB rear end to a 3.07.I have a 78 MGB with a Rover V8 and 5 speed.I bought an MGC 3.07 pumpkin to install.Any info will be appreciated.Thanks.Les.W4MGB

[mgb260]

If I recall correctly you have to machine .215 off MGB case for 3.07 gear to fit or use the MGC case?

[mowog1]

You can simply install the MGC differential complete...much easier than installing the MGC C&P into the MGB casing.

Be aware that the MGC differential most likely came from a wire-wheeled car (if sourced in the States)  and will be narrower than your current MGB differential (assuming that you have a steel wheeled MGB)

Have you verified that the MGC differential is indeed a 3.07. They were available in 3.07, 3.7, and 3.31 gearsets.

There should be a stamping on the case...the gears are stamped as well.

[W4MGB]

The numbers are 501 14 43.Thanks.Les.

[mowog1]

43/14 = 3.07