tasty danish

iTrader: (5)

First and foremost, do NOT turn this into a "get an 8.8" thread. I know ALL about 8.8's, what they are capable of, and what it takes to swap one, and make it race worthy.

I'm curious about the absolute limits of stock rear-ends.

Here's my issue, recently my turbo -se (250rwhp) totally layed waste to my ring and pinion gears.

this thread https://www.rx7club.com/showthread.p...t=differential has a brief discussion of how the ring and pinion are pretty stout pieces, all things considered. I think I tore mine up because it's an OG rear with about 150k on the clock.

Driveshafts can be custom made. Re-speed sells baller axles. OS Giken and KAAZ make differentials that'll hold up to power. What I'm curious of is at what point do the ring and pinion and housing flex become a serious liability, as these are the only parts that really remain.

My personal eventual plans are a bigger turbo (350-400rwhp) and used for auto-x/road course/daily. What I'm afraid of, is even if I go the OS giken and moser axle route, I'll still be up a creek with weak gears and general housing flex.

thoughts? braces? shot peening? cryo?

rotarycrazy

iTrader: (8)

I have seen guys run 400whp plus on a stock SE rear end witch is preatty much the same as a 84-85 GSL just axles are shorter with your case that you want to do autox and sticky tires I am not really sure if its worth going throu the trouble but then again you could probablly find a stronger replacement for the gears get one custom made or something I know it would be expensive but if you want to keep the stock rear then you got to pay.

Keeble

iTrader: (3)

what about sending the ring and pinion to get heat treated and then cryo treated? would that not increase the power handling capability and durability?

RX-7 Chris

iTrader: (19)

I thought the '84-'85 GSL was stronger them the SE. Maybe you could go with that.

tasty danish

iTrader: (5)

yes the GSL supposedly is stronger, but that's marginal at best. I'm not entirely convinced that I broke my gears because of a lacking gearset, as I've read about many cars with more power that keep them intact, but what I am hoping someone does know is at what point, even with a well kept rear end, do the gears become a liability.

In my experience cryo treatment or shot peening may help a bit but it's not a miracle.

As for the money for a stock rear
-$200 for a junkyard 8.8
-300 for good axles
-100 rebuild kit
-150 new gears
-600 good differential
-100-150 for floating axle ends off a 9" (c-clip elims suck)
-100 differential brace

we're over 1500 for a good one and don't have brakes or e-brake figured out. to me the ease of a working stocker with a kick *** differential isn't that expensive

thunkrd

iTrader: (1)

dam. i am always wondering about this. when does it become a problem? i know that my diff is bad, this will have to be rebuilt. and i plan on putting a T2 in there. what is the limit? anyone?

Keeble

iTrader: (3)

i wonder how strong the aftermarket ring and pinions are? such as the ones from racingbeat?

trochoid

iTrader: (6)

Answered your PM.

The GSL and SE diffs are basically identical. The only difference is the clutch packs in the Posi. The clutch packs ise the same parts, in a different order to modify the lockup.

That being said. Your best option would be to have a ring/pinion set treated and add the Moser axles. As for the RB ones being stronger, ask them.

My first major mechanical repair was swapping the diff on my friends 59 Impala in High School. He broke one and it threw a tooth though the front casing just driving down street. The second time it ran out of fluid and welded the geat set together.