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Rear end assembley

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Old 12-02-2017, 02:47 PM   #1
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Rear end assembley

86 iroc, I would like to replace my stock rear end with a bigger and stronger one. Any suggestions would be much appreciated
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Old 12-02-2017, 04:32 PM   #2
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Car: 1987 iroc
Engine: 383 TPIS intake, Dyno Don headers
Transmission: 700R4 w/Pro-built Auto/transgo 2-3
Axle/Gears: 3.27/3.70 borg warner 9 bolt

Re: Rear end assembley

You joined in 2012 and have 1 post? If your going to post, fill us in on details. Why go bigger? What HP are you running? Stick or auto? What rear gears are you currently running? What gears do you want? What's wrong with your rear end, and what's you budget or don't you have one.
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Old 12-02-2017, 04:42 PM   #3
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Car: 1991 Z28 Vert
Engine: 383 single plane efi
Transmission: T-56
Axle/Gears: waiting to break


Re: Rear end assembley

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Any suggestions would be much appreciated
Sky is the limit. How much do you want to spend and why are you wanting to upgrade it? If you are just doing street driving you don't need to upgrade the rear, just replace it if it ever blows out. Depending on how much you are paying per rear end (yards around me are only asking $100), you may be able to replace it 10 times before you reach the cost of a complete aftermarket rear end.
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Old 12-03-2017, 11:06 AM   #4
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Re: Rear end assembley

The engine is a SB350 chev (Dart bottom end, edlebrock heads and tpi fuel system with a blow through procharger.
Dyno HP=624 @wheels
Transmission--700r4 (custom built for my combo)

This is a weekend TOY and I have rebuilt the rear end 3 times
I do not want to butcher the body for a bigger rear end (now-373)
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Old 12-03-2017, 11:36 AM   #5
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Car: 1987 iroc
Engine: 383 TPIS intake, Dyno Don headers
Transmission: 700R4 w/Pro-built Auto/transgo 2-3
Axle/Gears: 3.27/3.70 borg warner 9 bolt

Re: Rear end assembley

Probably nothing smaller than a Ford 9" with 35 spline axles. Gear it for what your using it for.
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Old 12-03-2017, 02:08 PM   #6
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Re: Rear end assembley

I don't think you'll be limited to a ford 9". Strange S60 could still work. If you don't do drag racing an aftermarket 8.8 setup may hold. I don't see you getting out of this for less then $1400 complete with you power level.
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Old 12-03-2017, 06:01 PM   #7
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Transmission: 4L65E
Axle/Gears: MW 3.42 12 Bolt

Re: Rear end assembley

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Originally Posted by Tibo View Post
I don't think you'll be limited to a ford 9". Strange S60 could still work. If you don't do drag racing an aftermarket 8.8 setup may hold. I don't see you getting out of this for less then $1400 complete with you power level.
There is no cheap when it comes to rears!
S60 is economical and heavy but with no bells or whistles - more like $2800.
8.8 may hold, maybe. No idea on cost.
9" is a great rear, but to get them where their reputation is will cost north of $3500.

I went with Mark Williams 12 bolt, Stronger pinion yoke, Big Ford Brake housing, and set-20 bearings, TruTrac - the good stuff (it costs). $3300, then brakes.





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Old 12-03-2017, 07:29 PM   #8
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Join Date: Sep 2009
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Car: 1987 iroc
Engine: 383 TPIS intake, Dyno Don headers
Transmission: 700R4 w/Pro-built Auto/transgo 2-3
Axle/Gears: 3.27/3.70 borg warner 9 bolt

Re: Rear end assembley

Well, you could go with a S60 or 12 bolt and a 700r4 and probably live for a while, but with an estimated 750 hp at the crank and 624 to the rear tires, any time spent at a drag strip, or even just smoking the tires will strain the gears on a smaller diameter gear set. if you have built a motor and trans that good and it's just a ripper once in a while, why then skimp on the rear? Suppose you someday decide to go with a manual trans, the shock alone would damage a smaller rear. You have built a very good motor it sounds like, so keep the drive train happy and finish the build right.
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Old 12-04-2017, 10:29 PM   #9
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Location: JAMESTOWN, NC
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Car: 1989 Iroc
Engine: 383 TPI
Transmission: TKO600
Axle/Gears: 3.27


Re: Rear end assembley

Hawk's builds custom made 8.8 rear ends, and with the right selection of parts, they say they're good for about 1000 HP, and will cost you up into the high $3000. ...at what point the price per power rating stops being worthwhile is really up to your needs and budget I suppose. I haven't purchased one yet, but I will. Built the way I want, for my 400hp+ needs, it's the cheapest on the market and will handle my needs all day. Your power rating and needs may start to push the price into other options.
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Old 12-05-2017, 06:57 AM   #10
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Join Date: Mar 2011
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Car: 1991 Camaro RS
Engine: SBC 385, AFR Heads, 11.1:1
Transmission: Hughes TH350 Trans Brk.PTC5KStall
Axle/Gears: Strange S60 4:10s

Re: Rear end assembley

I have the race style s60 strange rear. 4.10 gears. It's heavier but with gun drilled axles, spool, it's not really that bad. Got it from Midwest Chassis and it was delivered in about 3 weeks from the day of ordering it.

Was the best priced option for me and i love it. It will never break.9.75 inch ring gear... 35 spline axles. It will handle your hp needs and then some.

Roughly 2800 bucks delivered, assembled, with strange disc brake kit included.






1991 camaro th350 with a brake. 385 sbc

Last edited by fasteddi; 12-05-2017 at 04:16 PM.
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Old 12-06-2017, 03:51 PM   #11
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Re: Rear end assembley

Thank You Guys for all your idea's.
I will definitely be changing this rear, as it is broken now.
Don't know which rear I will be using but I will be sure to post my results.
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