How to identify a Diff

Post by **RogerRust** » Sat Nov 04, 2006 8:58 am

Does the 4.55 diff always have a filler plug on the side of the diff housing?

And is it correct that the 4.3 axle always has the filler plug on the axle case at the rear?

I realise that there are some hybrids out there with either two or no plugs.

Otherwise will I need to count the teeth?

Post by **HarryMango** » Sat Nov 04, 2006 9:33 am

I think yes to the first two - but the late S11 5.3 diff also had the filler plug on the side of the diff housing, so teeth count is probably wise.

Rog

Post by **bigginger** » Sat Nov 04, 2006 12:46 pm

The ratio's usually engraved on the side of the crown wheel - might need a magnifying glass to read it though

Post by **rayofleamington** » Sat Nov 04, 2006 1:11 pm

much easier to count teeth to avoid any confusion. There are also 3.9 and 3.7 versions out there.

Post by **bigginger** » Sat Nov 04, 2006 1:50 pm

I'd have thought that just reading it was easier... Never mind

Post by **RogerRust** » Sat Nov 04, 2006 2:48 pm

how many teeth should there be?

I guess you just devide one by the other and see if to comes to 4.55

Post by **bigginger** » Sat Nov 04, 2006 3:17 pm

Yup - I'll have a look in a minute

Post by **HarryMango** » Sat Nov 04, 2006 3:24 pm

Have just found this - I knew I had seen it somewhere.

http://www.morrisminoroc.co.uk/technicaltips/diffs.html

Rog

Post by **bigginger** » Sat Nov 04, 2006 5:23 pm

Phew - I forgot to check. Too busy pulling an A post and door off a pick-up

Post by **RogerRust** » Sat Nov 04, 2006 7:04 pm

when I cleaned it it was marked 9/41 on the casting! 4.555 it is then.

As you may have seen elsewhere, it was a false alarm nothing wrong inside the diff must have been someones old teeth that fell out!!!