Solid drive shafts and diff mounts

[elansprint71]

Less than 3k miles ago I changed the chassis in my Sprint, I fitted
Spyder chassis, twin-wishbone rear suspension and Mick Miller CV
drive-shafts (amongst a load of other stuff!). I am in the process of
fitting a 3.55 diff in preparation for the Le Mans Classic next year.
I was very surprised to find that both the top diff mounts are
knackered, the holes in the steel bush having become ovalised; I think
the reasons for this must be: when the Rotoflexes are removed the
drive-line forces must be transferred somewhere else, the weak link
apparently being the diff top mounts (something has to give.
Talking with Tony Thompson, he agreed with me that the "toughness" of
rubber in components is not what it used to be- we all know about the
short life of modern doughnuts; he has stopped selling "ordinary" diff
top mounts and produces his own heavy-duty version.

I have put a photo in the Files section showing both the damaged mount
and the TT version.

http://f2.grp.yahoofs.com/v1/sMCWQ9C8vd ... e/Diff.jpg

Any one else had experience like this with solid drive shafts?

Cheers,
Pete

[Foxie]

Pete,

Are you using the 3.55 diff with a 4 or a 5 speed GB. I have a 5 speed, and 3,77, but am seriously thinking of putting in a 3.55. I have an 1800 Twincam.

Sean Murray

[elansprint71]

Sean,
I'm using a 4 speed box with the 3.55, the extra bit of shove from your
1800 should give you a useful continental-cruiser with the 5 Speed +3.55.


Cheers,

Pete.

[zuckerlowe]

Hi guys,
what is the 3.55 diff originally from?

Steve (1968 +2 1970 MGB)