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Re: E21 Differentials and Driveshafts (The weak Point?)

Posted: Thu Feb 20, 2014 11:38 pm
by problemchild75
+1

Re: E21 Differentials and Driveshafts (The weak Point?)

Posted: Fri Feb 21, 2014 2:45 am
by nas80
I feel a little light headed about how much that last weak bit will cost to sort out. :/

Re: E21 Differentials and Driveshafts (The weak Point?)

Posted: Fri Feb 21, 2014 8:09 am
by e21-Mark
Maybe we could approach them, plead poverty, and see if there's a reduction to be had if a few of us placed an order? They can only say no.

Re: E21 Differentials and Driveshafts (The weak Point?)

Posted: Fri Feb 21, 2014 9:16 am
by polov8
I haven't grovelled underneath to measure, but what dia are the CV's on these?

Re: E21 Differentials and Driveshafts (The weak Point?)

Posted: Fri Feb 21, 2014 9:21 am
by Duracel79
100mm OD
86mm PCD
32mm thick
The BMW CV's have a unique spline count (I think its 23)

Ben

Re: E21 Differentials and Driveshafts (The weak Point?)

Posted: Fri Feb 21, 2014 11:08 am
by croma_man
what about fitting in the 188 diff from a E30, on the swaps my mate is making with the S50 engines they all work well...

Re: E21 Differentials and Driveshafts (The weak Point?)

Posted: Fri Feb 21, 2014 5:25 pm
by problemchild75
Tbf in the long run a e30 188 and shortened shafts would be the most cost effective option. That conversion would probably cost less than the mentioned shafts and cvs be it ever so slightly cruder. Where is Propan? He's on a 188

Re: E21 Differentials and Driveshafts (The weak Point?)

Posted: Fri Feb 21, 2014 6:43 pm
by nas80
Why wouldn't gkn cv joints on standard driveshafts work? I don't normally complain about the cost, but I can't get over how much that stuff costs.

Can I not use e30 or e21 half shafts with upgrade cv joints?

Re: E21 Differentials and Driveshafts (The weak Point?)

Posted: Fri Feb 21, 2014 7:48 pm
by Duracel79
nas80 wrote:Why wouldn't gkn cv joints on standard driveshafts work? I don't normally complain about the cost, but I can't get over how much that stuff costs.

Can I not use e30 or e21 half shafts with upgrade cv joints?
If you could get a GKN joint to fit the BMW shaft that would be the way to go. I tried to find them and failed and GKN were not interested in making special joints to fit the BMW shafts. The difference is in the number of splines. E30 shafts are different again I believe.

btw there are std GKN joints to fit the custom shaft that can be picked up for about £50 each. They would probably cope with all an M20 could put out but I needed more with the S54.

Ben

Re: E21 Differentials and Driveshafts (The weak Point?)

Posted: Wed Feb 26, 2014 10:48 am
by croma_man
going to a 188 LSD diff from a e30, will keep you updated with the progress.

My still mint condition 323i diff with LSD is going to be on sale soon.

Re: E21 Differentials and Driveshafts (The weak Point?)

Posted: Wed Feb 26, 2014 11:30 am
by e21-Mark
PM with a price on your LSD delivered to the UK please croma-man?

I spoke to Gripper at Race Retro last weekend and they said they might be able to put together a more moderately priced solution. The guy did go into great detail about why the OE joints fail, using exotic metals etc etc, but I could feel my eyes glazing over. Anyway, he asked me to mail the spec of the standard shafts and CV joints.

Coincidentally, I saw Aydin's nice, shiny and new shafts being built up on Monday.

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Re: E21 Differentials and Driveshafts (The weak Point?)

Posted: Wed Mar 19, 2014 12:35 pm
by nas80
what if I use the e30 flanges in my e12 diff and in my rear hubs?

I have emailed these guys asking if they can do me a half shaft http://www.pureperformancemotorsport.co ... xle-s.html

Re: E21 Differentials and Driveshafts (The weak Point?)

Posted: Sat Oct 29, 2022 6:36 pm
by mcjjordan
What about using a sierra cosworth diff?