Blown the diff !!

Blown the diff !!

Author
Discussion

Dino42

Original Poster:

151 posts

231 months

Sunday 12th November 2006
quotequote all
Oops, seems we've bust the diff, at least I assume so ...lost all the drive but at least the speedo still works!
Pulled the engine out, I'll strip it tommorow, assuming it's the diff pin what do you all recommend?

Minispares seem to do 2 options (don't want to fork out for a cross pin)
1. hardened pin, with or without bushed gears.
2. Moly coated pin, but using std. gears.
Which of these is the 'tougher' setup?

It's used as a bit of a road rally car as well as 'normal' so gets a degree of abuse!!
Ta
D

Mr2Mike

20,143 posts

256 months

Monday 13th November 2006
quotequote all
Have you ruled out a broken CV joint?

Dino42

Original Poster:

151 posts

231 months

Monday 13th November 2006
quotequote all
Oh yes it's definatly the gearbox

guru_1071

2,768 posts

235 months

Monday 13th November 2006
quotequote all
the bushed gears pin is a waste of time as the bushes shuffle around. its only really ideal in situations where you need to reverse at high speed (i.e autotesting)

go for either the uprated std pin, or pay a little more and get the moly coated one.

i'd personally get a cross pin.

fit.

forget.

cooperman

4,428 posts

251 months

Monday 13th November 2006
quotequote all
For any sort of motorsport a cross-pin is really the only way to go.
They are just soooo strong. On one rally, I handbraked around a hairpin with a fairly big drop off on the outside. It was a looser surface than I thought and the car started to slide towards the edge. I was thus in 1st gear with my foot on the power at something like 7200 rpm with the inside wheel spinning like mad. Then the steering went very heavy and it turned out that I had friction-welded one of the planet wheels to one of the diff pins. I drove to the end of the test and was about to retire. However, to get back to the public road I had to go right through the next test and, mid-way through, the steering lightened. We went on to finish second overall after a further 300 miles and what had happened was that the pin had sheared inside the cross-pin housing. We did over 300 miles on a broken pin with no adverse effects. Now, that's how tough they are. By the way, it was a Mini Spares supplied cross-pin, so talk to guru1071 about getting one.

love machine

7,609 posts

236 months

Monday 13th November 2006
quotequote all
Yes, I have a moly coated super hard pin with some serious wear (out of a 998 with a 3.2FD).

4 pinion way to go.

Dino42

Original Poster:

151 posts

231 months

Monday 13th November 2006
quotequote all
OK cheers guys, you've convinced me - a cross pin diff is on the way, thanks to Rich.