Thread: Pre-Purchase: 32A Helical LSD

Ok guys i guess i´m the first one installing this on a 70A, already found a small problem, easy to solve, the original 70a crown wheel bolts are m10´s, the M´factory uses m12, so you´ll need to enlarge the crown wheel holes by 2mm and need 8 new m12 bolts for the LSD. Take note the crown wheel needs to be machined on a machine shop, and bolts need to be high grade.

Other then that seems do be a straight fit.

I´ll will update as i go...

Ok, this I was not made aware of during the testing. Let me double check the specs again with the tester and the engineer.

I assume this work is needed because it was designed for the 32A transmission, and you're trying to make it work for a 70A transmission (for which it was not specifically designed)?

My "test" unit didn't fit at all, I had to take my NISMO LSD diff out, find a spare open diff transmission, send it to my fab shop along with my MFactory one and a trans case and they are STILL trying to make it fit. Without over milling / causing the unit to not work at all.

Very frustrating, I've sent emails to MFactory with no reply so either I have the wrong email address (maybe person isn't there any more), its reaching a SPAM system or their email system isn't allowing it to be delivered.

Bolts are the same between the 32a and 70a
I've swapped several Quaifes from 32 boxes into 70's now.

You have PM

So i assume everybody will have this problem?

If it turns out to be an issue for everyone, we will fix it (be it new bolts, or bolt collars, or a re-threaded bottom case)

I don't have an actual bolt to test atm but it appears to be m12 on mine.

I dont even have time to open my trans until sometime this summer, so I'll keep an eye on this thread in the mean time.