B5m diff and b4 diff

[jasonnjane]

Is the b5m diff the same size as the b4 diff.

[racdeaf]

No it doesn't.

The B4 outdrive is shorter than B5M

[jasonnjane]

Just the out drives then?

[richm]

would expect that the bearings you need will be different as well.
the B5 outdrives sit in metric bearings.
the B4 would presumably be imperial.

[KRob]

It's never simple :o

The original B4 is imperial
The B4.1 / B4.2 are metric

And the B4.1 / B4.2 metric out drive bearing is a different size to the B5M outdrive bearing so not interchangeable.