hpbob1

iTrader: (1)

Hi Guys,

I have a 74 camaro with a factory 8.5" 10 bolt. Can this rear end be built as strong as a built ford 8.8?

I know most of the mustang guys and tirefryin S10 of this forum go well into the 8's in the quarter with 8.8 rears. tirefryin s10 is putting out 1100 turbo'd rear wheel hp to his built 8.8 in a 3200lb race weight car.

I plan on running twin 70mm turbos on my LQ4 6.0 with turbo 400 trans and 4000 stall at about 3400lbs race weight. I dont want to go to the extra expense and added weight of buying a ford 9 inch and building it. I already have a drum to drum 8.8 and the factory 8.5 10 bolt still in the camaro I can build.

Seems like the ford guys stick with the 8.8 and build it and the chevy guys dump their 10 bolts and quickly go to a 12 bolt, or ford 9 inch for 800-1000hp+ applications. Am I wrong here or can my chevy camaro 8.5 10 bolt be built just as strong as building my 8.8 for my 74 street/heavy strip camaro???

Hpbob1

Valkyn

iTrader: (8)

Check this article out:

http://www.chevyhiperformance.com/te...all/index.html

hpbob1

iTrader: (1)

Thanks Valkyn for the response and nice article. Sounds like it can handle some moderate power 400-500hp. But I need it to handle a lot of horsepower 1000-1200 at the flywheel after I add the twin MPT70 turbos to my 6.0 LQ4 (forged pistons & h beams). Anyone know if my factory 8.5 10 bolt can be built that strong?

Would be great if it can cause my 8.5 10 bolt is already in the car! Also keep in mind this old school 74 leaf spring rear end does not have a torque arm for added stress to the rear end. Sounds like the cheap way to build her would be a some good axles, a spool, after market diff cover and welding the axle tubes to the housing and adding some side weld brace bars on the housing from the rear carrier base to the forward secton of the yoke housing. Just add caltracs and go! Thanks guys.

Hpbob1

1961ba427

iTrader: (26)

You are on the right track here. If it were me, I'd go with a 33 spline spool & replacement axles in 33 spline. (vs stock 12 bolt 30 or your camaro's 8.5" 10 bolt 28 spline) If you buy them for a 68-72 Chevelle 12 bolt they will be the correct length and should be off the shelf and less than $300 for the pair with studs. This way you could end up with not too much in it.

MidwestChassis

iTrader: (5)

You can build a 8.5 to hold some decent power but you are going to do the same thing all the guys with built 8.8's do. Nine inch ends, welded tubes, braced, and diff cover. How much power it can hold is a loaded question really. I've seen 8.8 break in the center with 500hp before but I have seen people make over 800 and survive.

hpbob1

iTrader: (1)

Hi 1961ba427,

Your saying the 68-72 Chevelle 12 bolt 33 spline axles will fit my 8.5 10 bolt with a spool and be correct width of 61 inchs drum to drum? Just trying to clarify. Thank for any input!

Thanks Midwest Chassis. Considering this economy guys, where is a good place with low prices to buy Diff cover, 33 spline axles, spool, heavy duty yoke? Summit or Jegs? Any place else have good prices?

Anyone know of any 2nd Gen camaros in the low 9's or 8's with a built 8.5 10 bolt?

Thanks guys!
Hpbob1

1961ba427

iTrader: (26)

Yes. 68-72 chevelle axles were 30 spline stock, but 33 spline replacements are an off the shelf axle so they are not expensive. They share length with your camaro housing. You would need to buy a 33 spline spool for an 8.5". You might look into buying a used spool to save money. There aren't really any parts to break or wear. Even cheaper, but not quite as strong...just run stock 30 spline 12 bolt axles and get a 30 spline 8.5 spool. You could easily find that used since late model 8.5's (8.625") were 30 spline from the factory. I personally have never had a problem with a stock yoke. Rear girdle/covers are the same price everywhere it seems...so it's either $160 or find one used. I see 7.5" ones all the time, but 8.5" & 12 bolt ones don't come up as often.
I'm not trying to knock any of our great sponsors, or Summit / Jegs. Just saying that for a really budget rear that will take some abuse you should be looking at about:
33 spline Spool - $70 - $125 (Those 2 are new old stock strange spools from 2 diff sellers on Ebay right now.)
33 spline Axles - $270 ($135 each new is all I see right now...think Summit has a pkg with studs and all for similar price. 30 spline pair is only about $220 from Summit/Jegs)
TA style cover - $160
If you can do your own set-up & welding, just add for bearings/seals/lube/gear of your choice.

hpbob1

iTrader: (1)

HI 1961ba427,

Thanks for the response. I just add a c-clip elim kit and what do you think about 3.42 ring gear used out of a junk yard truck? I know aftermarket drag gears are stronger but I read they should be for drag race only use. I plan on a 60% street/ 40% strip. Ideally I want a dual purpose turbo'd street/strip car about 1000 fly wheel hp with the turbos. My buddies who have drag raced for years claim dual purpose can't be done. Either drag only or street only. I say with a turbos you can do it cause of a med roller cam about 9.4 compression etc. I will just swap out tires and wheels adding slicks or drag radials at the drags, and have adjustable shocks up front. Of course car will have a full 10 pt cage, aluminum subrame connectors & bisquits, and solid motor and trans mounts. Trans will be built 400 with brake (disabled auxillary kill switch for transbrake elim on street), about a 3600 - 4000 stall Thanks for any advice!

Hpbob1

MidwestChassis

iTrader: (5)

Anything you are looking for we can get you. Keep in mind price in these particular items some times does equal quality. Not all the time but usually does. Just let me know what you are interested in and I will see what I can do for you.