The miata drivetrain does NOT like abuse and 8 out of 10 failures I can bet are due to driving style *abuse*
Ease off the dump clutch starts, powershifts, and replace the hammer you may have as a foot with an smooth linear motor that has more settings than "on-off".
If you are as smooth as someone named Schumacher then please feel free to ignore me :woolery:
The issue with the miata rear end has always being the bearing caps. When you have wheel hop they break, shatter in pieces and then everything else breaks inside. Blame torque, heavy rims and sticky tires.
I am going with Ford 7.5 live axle swap but with custom billet bearings caps as the prototype I have on the car now solved the issue.
Not boosting, sticky tires, no drag racing, no tracking I do drive it A hard constantly I feel like such a douche bag now that I realize how I drive my car thanks guys
What lube do you guys recommend to put in the new rear-end?
Can an installation procedure cause this?
I did two seasons of autocrosses with co-drivers on Qualcomm (rough surface) and never had my torsen break. (in my old 99)
Hard driving isn't gonna cause it, generally speaking.
He could ruin the ring and pinion if not properly installed. If he's just having the whole unit swapped without cracking the case open this should he a non-issue.
Well theres your problem. The rear end that comes with the 89-93 sucks whether its open or vlsd. It only has a 6in gear and is known to break at stock power levels, which you seem to have figured out by now. Swap to the rear end from a 94-05 car. You will need to swap the drive shaft, axles, and the whole differential unit including tjhe carrier, ring, pinion, and lsd. Just search for a torsen swap. You can find them in the classifieds or from parts vendors like planetmiata or 2ndchanceroadster. Both of those are site sponsers and you can PM them on this very site.
He just wrote it is a 1.8 rear.
So, who is installing this thing? Are clearances correct?
You dont sound like you are beating on this thing enough to even break a 1.6 rear. You have hardly any power and I dont see clutch kicks or launches in your post.
Use Torco RGO gear oil in the rear with the F additive.
^This...my understanding is that you swapped in a 1.8 engine and left the stock rear end. Before I swapped my Torsen for a Kaaz unit I used to beat the hell out of it drifting at event's and random practices. Those rear ends are one tough cookie and you can snag them for relitively cheap. :3
Well, I broke two 1.6 diffs in 9 weeks under puny stock 1.6 power and I wasn't pushing the car at all. Swapped in a Torsen and put an end to that nonsense! I recommend you do the same.
im thinking you probably installed it incorrectly. even a 1.6 diff could last a little longer on a 1.8 motor, now unless you got yourself some slicks and doing some intense driving, i dont know wtf it could be.
My guess is the first one blew and was replaced by a crappy one found at a pick a part that was already close to toast. With how crappy the 1.6 rear ends are its really a gamble installing another one that yu dont know a history on. When I first picked up my car the rear was trash. The shop I had mine at had to source three different diffs before they found one that was actually in good working condition. I wish I was more miata savvy then. I would have then known to upgrade to a torsen instead of replacing it with yet another shitty vlsd. I was just glad at first to have found one with lsd so cheap haha.
+1 on the Torsen swap from a 1.8 car...should solve most, if not all of your problems...
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