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Offline TurboCajun

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busted rear end
« on: March 02 2015, 04:48:24 PM »
broke my rear end friday night at the track. Spider gears sheared, ring and pinion still good. i was looking around the net to find some replacements to get it back on the road but from what I understand GM doesn't allow you to change them, you can for an open diff, but not a posi. so I am looking into going with the Auburn pro 30 spline and 30 spline axles. will that be enough to handle high 1.4 sixty foot?
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85 GN -- Converted to 87 set-up using 66/72 turbo, front mount I/C, 80lb injectors,gn1 heads 14 bolt 1.65 roller rockers stud mount, ported intake with plate, fuel hot wire, 3" dp, running 24psi., alky kit, stroker 20 over, 212/206 roller,  best time 10.995 @ 121 1.56 60ft

Offline Forzfed

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Re: busted rear end
« Reply #1 on: March 02 2015, 04:57:35 PM »
That should do the trick.  That is what I have and my car weighs in at over 4000lbs with me in it.  I haven't made those short times but I will be attempting them soon.
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Offline TurboCajun

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Re: busted rear end
« Reply #2 on: March 02 2015, 04:59:58 PM »
the stock unit has a 1.49 and many 1.50s , until friday
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85 GN -- Converted to 87 set-up using 66/72 turbo, front mount I/C, 80lb injectors,gn1 heads 14 bolt 1.65 roller rockers stud mount, ported intake with plate, fuel hot wire, 3" dp, running 24psi., alky kit, stroker 20 over, 212/206 roller,  best time 10.995 @ 121 1.56 60ft

Offline Forzfed

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Re: busted rear end
« Reply #3 on: March 02 2015, 05:25:28 PM »
How much does your car weigh?
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Offline TurboCajun

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Re: busted rear end
« Reply #4 on: March 02 2015, 06:38:09 PM »
3640 with me in it
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85 GN -- Converted to 87 set-up using 66/72 turbo, front mount I/C, 80lb injectors,gn1 heads 14 bolt 1.65 roller rockers stud mount, ported intake with plate, fuel hot wire, 3" dp, running 24psi., alky kit, stroker 20 over, 212/206 roller,  best time 10.995 @ 121 1.56 60ft

Offline Steve Wood

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busted rear end
« Reply #5 on: March 02 2015, 11:22:16 PM »
I used an Eaton with 30 spline axles
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Steve Wood

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A lot of broken parts does not make you a racer; it makes you a slow learner.

Offline Forzfed

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Re: busted rear end
« Reply #6 on: March 02 2015, 11:25:30 PM »
Quote from: Steve Wood on March 02 2015, 11:22:16 PM
I used an Eaton with 30 spline axles

Actually, that is what I have.  My old car had the auburn.
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Offline Scoobum

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Re: busted rear end
« Reply #7 on: March 03 2015, 02:18:28 AM »
I run an Auburn Pros Series 28 spline with Moser axles and a girdled diff.
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Offline Steve Wood

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Re: busted rear end
« Reply #8 on: March 03 2015, 11:28:52 AM »
Eaton also makes the Detroit Trutrac which seems to be very popular these days.  It doesn't use clutches.
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Steve Wood

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A lot of broken parts does not make you a racer; it makes you a slow learner.

Offline TurboCajun

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Re: busted rear end
« Reply #9 on: March 03 2015, 12:12:44 PM »
I was told the trutrac make noise
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85 GN -- Converted to 87 set-up using 66/72 turbo, front mount I/C, 80lb injectors,gn1 heads 14 bolt 1.65 roller rockers stud mount, ported intake with plate, fuel hot wire, 3" dp, running 24psi., alky kit, stroker 20 over, 212/206 roller,  best time 10.995 @ 121 1.56 60ft

Offline Steve Wood

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Re: busted rear end
« Reply #10 on: March 03 2015, 12:34:18 PM »
I thought the trutrac was the quiet one...does not use clutches...use s helical gears...will have to do some googling

I see quite a few reports of noisy ones along with many that are not....got me.

The Auburn Pro seems to work pretty well for most and comes with one replacement free if it goes bad if I remember correctly
« Last Edit: March 03 2015, 12:39:35 PM by Steve Wood »
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Steve Wood

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A lot of broken parts does not make you a racer; it makes you a slow learner.

Offline TurboCajun

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Re: busted rear end
« Reply #11 on: March 05 2015, 09:15:41 AM »
Car is back up and running with some used spider gears , time to start saving for the good stuff. I have a friend that is a dealer for Moser, on their web site and other venders the axles are $260 for the set, he can get them for $199.
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85 GN -- Converted to 87 set-up using 66/72 turbo, front mount I/C, 80lb injectors,gn1 heads 14 bolt 1.65 roller rockers stud mount, ported intake with plate, fuel hot wire, 3" dp, running 24psi., alky kit, stroker 20 over, 212/206 roller,  best time 10.995 @ 121 1.56 60ft

Offline GavinHunyady

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Re: busted rear end
« Reply #12 on: March 05 2015, 01:27:53 PM »
I've run trutracs a lot in roundy roundy cars, now granted they were in quick change rear ends that are stupid loud by themselves. They seemed quiet to me, compared to detroit lockers and any clutch type that feels like it has rocks in it.
I like them.
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