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Two broken rearends in 4 months

2K views 43 replies 24 participants last post by  BIG_RON 
#1 · (Edited)
Is this problem preventable?
Is there something I can do to the rearend that is going onto my car before I put it in?
 
#14 ·
+1

What rearend u putting in? Are u boosting? and are u putting proper lube?
Need to know this...

are you running super sticky tires? are you tracking?

did you spit on it?
And this...

If you have a Torsen then you either A. Have lots of TQ, B. Drive like a complete moron, or C. Have very bad luck.

If none of this is true then please elaborate more than two sentences stating whats going on please.
And this...

Upgrade to 1.8 rear end.
This is just a good idea...

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:
 
#7 ·
QFT
 
#12 ·
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.
 
#18 ·
Why don't you tell us which rear end you have? If you don't know atleast tell us the year your car is.

We are just all speculating because you have yet to give us any information.

You might as well have made the thread titled "mah **** broke why!!!!" C'mon man this isn't that hard.
 
#20 ·
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.

What rear end do you have?

In what way is it breaking?
 
#22 ·
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.

Heres a site with information on our rear ends.

http://miataturbo.wikidot.com/differential
 
#24 ·
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.
 
#26 ·
^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
 
#27 ·
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.
 
#32 ·
weighs enough to blow a diff apparently.


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.
 
#33 ·
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. :oops:
 
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