HotRodMex

iTrader: (3)

What you're not noticing is he did address that problem buy re-engineering the mount. If you look at the bushing, it is in compression; it's basically like our lower control arm bushings. The brackets still have a shear load, but that has never been an issue. We'll call it "half-fixed.

Also, what I notice about this, is that i might make diff removal easier? You only have to remove the bushing bolt to get the diff out right? So you don't have to drop the subframe to get to the bolts? That alone might make it worth it, especially if you are messing with LSD pre-load, or maybe get crazy and have different differentials with different setups for different events...different...

therotaryrocket

Dude, I'm so glad I found this, I need to fix my front diff mount and i'm on a pretty tight budget, I think I might do something exactly like this. Care to share dimensions? thanks for posting this btw.

Supercharged FC

iTrader: (7)

Yes you can remove the bushing bolt, but mine did not make it easier. It was too tight of a fit to pull apart. I would estimate mine is 1/4 wider than the stock one

If you make one, drop the whole subframe and test fit a few more times than I did you could make it slide out. Maybe use a smaller, stiffer bushing.

Supercharged FC

iTrader: (7)

It's installed so I cann't give you the exact measurements. The whole thing was built around the bushing. It was from a energy suspension kit for the rear of a rx7. Start with the bushing, find a pipe with the right inner diameter and make brackets to provide clearance.

Heres some estimates
The bracket was the same height as the diameter of the bushing lip so about 1.75-2 inches, and the hole was drilled 1/2 from the top of the bracket to alow for compression. The pipe had an inner diameter of 1.5 inches to match the bushing and was 1/8 inches thick. The brackets where cut wider than the bushing lip by 1/4 on each side so about 2 1/4 to 2 1/2 inches.

Supercharged FC

iTrader: (7)

If you don't have a bushing yet try Allstar Performance. They sell bracket kits with bushing for suspensions. Might be the best route. Check out there catalog.

therotaryrocket

this is such a great design and I love how the rubber is only going to experience compressive forces instead of the shear that rips apart the dumb factory mount. thanks so much for the dimensions, you've made it so easy for me, hopefully I'll get this done sometime before christmas and I'll post back. thanks again!

atli126

back from the dead...


Did anyone else do this and have good results?

Supercharged FC

iTrader: (7)

I broke mine, so if you do this use thicker gauge steel and a harder bushing. Failure was not at the bushing but a corner with a weld.

I did not have access to a welder so I put a pinion snubber above the diff and a stock mount. That hasn't torn that yet. Snubber is super easy modification. If that breaks I'll weld together new diff mount.

Supercharged fc

atli126

I bought this and will be installing the lucky10 mount soon, with delrin subframe bushings, a reinforced 3/16 welded in tab and a pinion snubber up top. I already have the mazdaspeed rear diff bushings and dtss bits with the ronin dogbone camber links and poly bushings everywhere else

https://www.rx7club.com/group-buy-pr...totype-997329/

https://www.rx7club.com/group-buy-pr...-938333/page6/

LargeOrangeFont

iTrader: (7)

That delrin one will be solid, I dont know why they call it semi solid. It should transmit a bit less noise than an all metal one though.

Please run delrin subframe bushings at least.