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Old 10-23-2012, 10:07 AM
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4th Gen F-Body Rear End question

I am looking into either buying a 93 Camaro or a 95 Trans Am. I have seen a few videos on Youtube of 4th F-Bodies blowing up there rear ends on the strip. I have seen a few forum posts that the rear ends on the 90's F-Bodies are crap as well.

If I am planning on doing a lightly modified Street and Strip car (probably will only be in the low 300s in terms of horsepower and torque) will the rear end be a problem?
Should I get an 3rd Gen IROC or Z28 instead?
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Old 10-23-2012, 10:44 AM
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All the 3rd and 4th Gen F-bodies share the GM7.5, except for a few rare D44 and BW-9bolts. Its slicks and a dragstrip that induce the 7.5 to self-grenade. On the street with hard radials, they are fairly durable.
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Old 10-23-2012, 11:52 AM
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I don't know why GM kept using the little 7.5 (upgraded to 7.62 in '87) in the F body cars, especially when the HP started going up. I could understand it when the 305 was the largest engine available, but when the 350 was installed they should have upgraded the rear end too. Ford used the 8.8 in all of the 5.0 Mustangs starting in '86, so GM should have done something to strengthen the drive train in the F body too.

There are things that you can do to the 7.6 to make is a little stronger. Most people use a T/A Performance aluminum cover to brace the housing and bearing caps. GM alreaqdy installed larger 28 spline axles starting in '90, so that shouldn't be a problem. Getting rid of the Auburn differential in favor of a Eaton Posi would be a good upgrade.
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Old 10-23-2012, 02:23 PM
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Quote:
Originally Posted by lmsport View Post
All the 3rd and 4th Gen F-bodies share the GM7.5, except for a few rare D44 and BW-9bolts. Its slicks and a dragstrip that induce the 7.5 to self-grenade. On the street with hard radials, they are fairly durable.
Well no planning on using slicks anytime soon, so I should be good.
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Old 10-23-2012, 02:24 PM
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Originally Posted by big gear head View Post
I don't know why GM kept using the little 7.5 (upgraded to 7.62 in '87) in the F body cars, especially when the HP started going up. I could understand it when the 305 was the largest engine available, but when the 350 was installed they should have upgraded the rear end too. Ford used the 8.8 in all of the 5.0 Mustangs starting in '86, so GM should have done something to strengthen the drive train in the F body too.

There are things that you can do to the 7.6 to make is a little stronger. Most people use a T/A Performance aluminum cover to brace the housing and bearing caps. GM alreaqdy installed larger 28 spline axles starting in '90, so that shouldn't be a problem. Getting rid of the Auburn differential in favor of a Eaton Posi would be a good upgrade.
If I get on of them Ill purchase the T/A aluminum cover and the posi. Thank you for your help
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Old 10-23-2012, 05:01 PM
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From a wrenching (and purely aesthetic) point of view, I'd take the 3rd gen over any 4th gen. If you're going to be doing a lot of the work yourself, might want to pop a hood on 4th gen before you buy it, the engine is so far under the cowl you'd think you were working on a van. Thankfully, the optispark distributor sits in the front. Easier to deal with, but in a perfect spot to "make your day" every time it gets wet.

If you just want good out-of-the-box power, you can't go wrong with an LT1 in a 4th gen. Wouldn't take much to reach your power goals.
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Old 10-24-2012, 12:28 PM
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Two different types of 4th gens. Out of the 3 I would take the 98 and newer 4th gen....LS1 is way better than the LT1 in the earlier 4th gens and you don't have to deal with the opti-spark. Which isn't that big of a deal if you know how to cure the problem. plus the LS1 is lighter than the LT1.
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Old 10-24-2012, 01:43 PM
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Two different types of 4th gens. Out of the 3 I would take the 98 and newer 4th gen....LS1 is way better than the LT1 in the earlier 4th gens and you don't have to deal with the opti-spark. Which isn't that big of a deal if you know how to cure the problem. plus the LS1 is lighter than the LT1.
They also used the Torsen differential instead of the Auburn. Much better.
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Old 10-24-2012, 08:57 PM
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Quote:
Originally Posted by txturbo View Post
Two different types of 4th gens. Out of the 3 I would take the 98 and newer 4th gen....LS1 is way better than the LT1 in the earlier 4th gens and you don't have to deal with the opti-spark. Which isn't that big of a deal if you know how to cure the problem. plus the LS1 is lighter than the LT1.
I agree, though the LS1 camaros are pug-ugly. They look like chrysler concordes. If he's shopping pre OBD-II 4th gens, I'm sure that the LS1 models are a little out of his desired price range.

Mxrider13, if you can afford an Ls1 f-body, go for it. I had my chance a while back with a 99 camaro that had t-tops and a t-56. They wanted 7900 for it at a stealership and it needed a couple things. I passed on it. Fun car though, it wanted to kill me everytime I got on it
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