Originally posted by LowR3V'in
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Broke diff. mount.
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And definitely going to want to clean up all the cracked areas that will need to be welded. Not to mention you may discover other cracks to be welded. All cracks should have stop holes drill too to keep them traveling after welded. Slow welding, lowest heat possible as the metal is already fatigued and could just crack again later.
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I've never seen an e30 fail like the Z3's do, where the whole rail pulls down/separates. That's why Randy goes to that extent. With e30's it seems to always just be the tabs and maybe a vertical crack in the rail at the tab. Obviously doesn't hurt to overbuild though.
One thing I noticed is that your stock rubber diff bushing is torn on the bottom, separated from the outer race. Mine was too. I got under there with a pry bar and pulled down on the diff, it easily pulled down, the rubber bushing was just pivoting and smashing around that outer race. I think what happens, is when you shift hard, launch, etc... the diff actually gets some momentum with the bushing not doing anything, and then it finally catches and it's almost like an impact on those tabs, especially when you wheel hop. I bet that's what does the damage we see.
Here's a video of mine with the worn rubber bushing. Check out the diff movement.
First clip is with a 4.5" 600lb/in spring, 2nd clip is with a 4" 825lb/in spring. Static ride height was set the same for both. Notice the Bilstein sticker o...
I swapped in an 80A poly mount, the diff doesn't move at all, it's 100% solid. I welded up the cracks and am just going to see how it holds up. If it fails again, I'll do some reinforcing and/or a 2nd mount.
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E30 diff mount by jet jones, on Flickr
E30 shitty diff mount by jet jones, on Flickr
E30 diff sux by jet jones, on Flickr
Diff support by jet jones, on Flickr
also, don't think u can pop out the spot welds and it falls off.
that muther fucker was glued on there like a bitch. need to cut it out.
E30 diff mount by jet jones, on FlickrLast edited by LowR3V'in; 10-23-2018, 09:50 PM.
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Sweet. Make sure you post up when done, I'd like to know how you went about getting the diff ear mounting tab location figured out, trigger wheel swapped, etc...
Originally posted by dsphil View PostI can't believed that structural member would break in half like that.
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yup, i've noticed the split some years ago but.. ya know.
shitting blood for a year then going to the doc him saying you have cancer
could of been treatable acouple months ago. too bad so sad. imagine.
not me but sorta what this diff situation is.
speed ring is pretty easy to tap on/off.
E36 speed ring by jet jones, on Flickr
just mark the spacer orientation
pop out of sides and the diff pulls out.
Marked position by jet jones, on Flickr
3.23 by jet jones, on Flickr
now i'm having trouble finding proper spot to put the mounting point.
this is how i sorta am eye balling the situation. i don't want to fuck up the angle.
advice?
How do I mount this by jet jones, on Flickr'
there is a huge amount of play up/down
i can jack it up where the subframe hits the trunk and lifts the car or leave the diff drop and it's pointing like super angled down.
bushings are ie blue bois.Last edited by LowR3V'in; 10-30-2018, 08:35 PM.
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