exodus_gs1

iTrader: (3)

Well I started a thread about this in the gear&axel section but this is a more viewed part of the site. My questions are what needs to be done to run a 8.5" 10 bolt out of a 79 Camaro in a fbody? Is there a write up by chance? Also where do I find the axles I need to run 4 channel abs? And how do I go about switching to disc brakes?

Original thread:
https://ls1tech.com/forums/gears-axl...9-10-bolt.html

Also is this worth it? I have heard of guys building a 8.8 capable of holding 650hp for 6-700 bucks. Any truth in it? If so couldn't the same be done with this?

RPM WS6

iTrader: (3)

The 8.5" is significantly stronger than a 7.5". In a light weight car, they will hold up to almost as much abuse as an 8.875" 12-bolt. Having said that, I don't know what the cost or difficulty is to make one fit a 4th gen (minus the money saved since you already have the rear), and ultimately that might determine whether or not it's worth using.

exodus_gs1

iTrader: (3)

Cool thanks for the reply, I'll just keep doing more searching and see what's up. With it being shorter on each side would I be able to just do a mini tub and that work or would that put my tires in to far and look dumb?

Drednot

iTrader: (1)

Call Moser for the rearend brackets and Kore3 for the disc brakes.

I have a 8.5 in my nova and moser said it can handle 600hp if I use 30 spline axles, weld tubes to center section, and weld ford bearings to bolt axles in. When I priced all of that it is about the same price to buy a complete 12 bolt. If your making big power I would go with a 12. If your under that and have the 8.5 already, go with it. My .02

exodus_gs1

iTrader: (3)

thanks, yea idk what im going to do now. I finally talked my wife into letting me go all out as fast as possible with the car. So I think ill be going with a mwc 9" my plan is single digits so that rear wont stand up lol.

LASTOFTHEBREED02T/A

iTrader: (15)

Sup man, let us know for sure what you go with... Im also looking into getting a stronger rear end. But as usual, im on a budget. Would be nice to buy a brand new 12 bolt and be worry free, 2K seems kinda steep tho.

Why did they stick 10 bolt 7.5 in these rides...

exodus_gs1

iTrader: (3)

See thats what im saying. If i can't make time this weekend ill be on vacation next weekend till the new year. So ill look into fitment

bww3588

iTrader: (49)

Profit margin...

It's plenty strong enough to out last the 3/36 under stock power on stock tires. No need for anything stronger. The ones that do break under stock power under warranty will be either voided or honored. Either way, it's still less money out of GM's pocket then putting a stronger rear in from the start.

Drednot

iTrader: (1)

I have seen cars with the 8.5/10 go into the single digits, but they were running powerglides with a really low (numerically) first gear.

I am afraid I will spend 2k building my 8.5 and possibly grenade it. I am thinking 12 bolt for about same price and peace of mind.

bww3588

iTrader: (49)

Even the 12 bolt is not bullet proof. A few hard launches on a 12 bolt, and there is a good chance the pinion bearing is going to start singing on you and eventually take the gears

If your worried about trashing an 8.5, an 8.875 is not going to give you much more wiggle room. Go straight to the 9 inch and don't look back. It's significantly stronger than a 12 bolt and will hold up much better to hard launches and will run you about the same maybe less than a 12 bolt.

RPM WS6

iTrader: (3)

I agree.

If you're on the boarder of breaking an 8.5, then the 8.875 will only be marginally better, as there isn't a world of difference in strength between the two.

Prior to the 8.5" being introduced, the factory options for small/mid-sized cars were an 8.2" 10 bolt for lower end engines, or the 8.875" 12 bolt for performance applications. Then, in or around 1972 the 8.5" 10 bolt appeared as the standardized middle ground compromise between the slightly stronger 12 bolts and the weaker 8.2" 10 bolts that had been offered previously. Then by the mid-'70s, the 7.5" was introduced for use in basic/non-performance applications, and the 8.5 was the heavy duty/performance rear.

The 8.5" continued in full-sized cars and small truck applications, but did not find it's way back to F-bodies after the 2nd gen years.

Drednot

iTrader: (1)

Yeah I hear ya. The nine inch is a good option. I think they do run just a tad cheaper too (at least through Moser).

LASTOFTHEBREED02T/A

iTrader: (15)

Nice Info as usual man!... Thx for making me a lil smarter and can now go around talking about it like i know my stuff.

Its a shame the F-bodies dont have a stronger rear stock, its truely an achilles tendon.

exodus_gs1

iTrader: (3)

^^ I agree with it all lol. I have learned alot on this site and I to agree on the weak rear. You would have thought by the late 90's they would have realized that the fbody was going to be modded and built. But then again I understand keeping cost low so more people will buy them they make more money and still get to sell you a 12 bolt later haha.