NavyCPO Posted April 23, 2023 Share Posted April 23, 2023 Ok so before everbody says throw away this 8.2" 10 bolt, let me say this. I used to have a '68 Camaro with a 540 BBC (730HP)and it had an 8.2" 10 bolt in it. I put Richmond 3:73 gears in it with all new carrier and axle bearings and a set of Moser 28 spline axles in it (still used the stock 3 series carrier) and I welded the axle tubes to the housing and never had a problem with the rearend. Now, having said that, the car would usually spin the tires and I never did get the car back halfed or 4 linked or ladder bars. Just leaf springs with slapper bars. But the 8.2" held up to some abuse. I've heard on here that folks say the 8.2" rears can only handle about 400HP. Buying a new Rear End is extremely costly nowadays. What I remember as being about 18-2200 for a fully assembled Moser rearend is today 4700+. Not in my budget. I know I can get a used 12 bolt out of a chevelle and I've seen some. But wanting to hear your experience and knowledge with the 8.2". Thanks in advance! Quote Link to comment Share on other sites More sharing options...
jft69z Posted April 23, 2023 Share Posted April 23, 2023 I sheared the pinion gear off on my first Monte with a 327/350 hp engine (my high school car). The yoke was still bolted to the end of the driveshaft, leaked gear oil all over the street. It was right up the block from my parents house, and it smelled like gear oil at that intersection for a long, long time. 😁. 2 1 Quote Link to comment Share on other sites More sharing options...
Michael Boyte Posted April 23, 2023 Share Posted April 23, 2023 Nitrous took care of our original gear setup when I was 17 😂 Needless to say, We then took the necessary steps to take care of that problem ( Mark Williams center section ) !! 2 Quote Link to comment Share on other sites More sharing options...
420ponies Posted April 23, 2023 Share Posted April 23, 2023 (edited) Just to let you know, I've had a 2:73 gear ratio posi-traction behind my 420 hp 355 small block for the last 23years with no issues. I had thought it was a 3:42 gear because of the RPM's it was running at 70 mph. I'd like to also add that I had a'68 Firebird with a 4:88 Gear 10 bolt posi-traction and a 455 big block 400 turbo transmission and never had a problem turning 13.0/31 inch tires ( slicks) and turning 7400 RPM's in the 1/8 mile every weekend back in the day. The10 bolt was a great rear axle no matter the combination in my mind.That's running 7. 30s in the 1/8 mile, 11.30s in the 1/4 mile Edited April 23, 2023 by 420ponies Added content 1 Quote Link to comment Share on other sites More sharing options...
Scott S. Posted April 24, 2023 Share Posted April 24, 2023 Hey Dale, With all that re-enforcement on your Camaro's differential, it's hard to compare it to a stock one. I've had a few 8.2" rear ends over the years. My '80 El Camino had one with 3.08 gears and cratered at about 70,000 miles, whereas my '86 Buick T-Type had one with 3.42 gears and was still running strong at 180,000 miles. Sometimes it's just the luck of the draw. Montelishi originally arrived with an 8.2" with 2.73 gears, (which are still laying around here somewhere.) But when I went to the 200r4, I wanted to up the ratio, and luckily I found a 12 bolt with 3.31 gears for $1600.00 (cdn), which was cheaper than rebuilding the 8.2". I know "A" body rear ends are hard to find these days..... But if you're not in a big rush, maybe the right deal may come along. Quote Link to comment Share on other sites More sharing options...
NavyCPO Posted April 24, 2023 Author Share Posted April 24, 2023 22 hours ago, 420ponies said: Just to let you know, I've had a 2:73 gear ratio posi-traction behind my 420 hp 355 small block for the last 23years with no issues. I had thought it was a 3:42 gear because of the RPM's it was running at 70 mph. I'd like to also add that I had a'68 Firebird with a 4:88 Gear 10 bolt posi-traction and a 455 big block 400 turbo transmission and never had a problem turning 13.0/31 inch tires ( slicks) and turning 7400 RPM's in the 1/8 mile every weekend back in the day. The10 bolt was a great rear axle no matter the combination in my mind.That's running 7. 30s in the 1/8 mile, 11.30s in the 1/4 mile You're talking about the 8.2" 10 bolt or the 8.5"? Quote Link to comment Share on other sites More sharing options...
NavyCPO Posted April 24, 2023 Author Share Posted April 24, 2023 2 minutes ago, Scott S. said: Hey Dale, With all that re-enforcement on your Camaro's differential, it's hard to compare it to a stock one. I've had a few 8.2" rear ends over the years. My '80 El Camino had one with 3.08 gears and cratered at about 70,000 miles, whereas my '86 Buick T-Type had one with 3.42 gears and was still running strong at 180,000 miles. Sometimes it's just the luck of the draw. Montelishi originally arrived with an 8.2" with 2.73 gears, (which are still laying around here somewhere.) But when I went to the 200r4, I wanted to up the ratio, and luckily I found a 12 bolt with 3.31 gears for $1600.00 (cdn), which was cheaper than rebuilding the 8.2". I know "A" body rear ends are hard to find these days..... But if you're not in a big rush, maybe the right deal may come along. Thanks for your feedback! 1 Quote Link to comment Share on other sites More sharing options...
MC1of80 Posted April 24, 2023 Share Posted April 24, 2023 4 hours ago, Scott S. said: Hey Dale, With all that re-enforcement on your Camaro's differential, it's hard to compare it to a stock one. I've had a few 8.2" rear ends over the years. My '80 El Camino had one with 3.08 gears and cratered at about 70,000 miles, whereas my '86 Buick T-Type had one with 3.42 gears and was still running strong at 180,000 miles. Sometimes it's just the luck of the draw. Montelishi originally arrived with an 8.2" with 2.73 gears, (which are still laying around here somewhere.) But when I went to the 200r4, I wanted to up the ratio, and luckily I found a 12 bolt with 3.31 gears for $1600.00 (cdn), which was cheaper than rebuilding the 8.2". I know "A" body rear ends are hard to find these days..... But if you're not in a big rush, maybe the right deal may come along. The regal t-type and grand national along with the hurst olds and 442 had 8.5 rear ends from the factory and the el caminos came with 7.5 rears from the factory. 1 Quote Link to comment Share on other sites More sharing options...
420ponies Posted April 25, 2023 Share Posted April 25, 2023 Yes Dale , The 8.2" . Only way to explain this rear axle is it doesn't have the 2 cast lugs under the diff. cover like the 8.5" . Just like the one in my old '68 Firebird race car. Quote Link to comment Share on other sites More sharing options...
Scott S. Posted April 25, 2023 Share Posted April 25, 2023 20 hours ago, MC1of80 said: The regal t-type and grand national along with the hurst olds and 442 had 8.5 rear ends from the factory and the el caminos came with 7.5 rears from the factory. I guess you can't judge a differential by it's cover..... When I replaced the oil in the T-Type, no one knew which cover gasket to use, so I got both. Wound up using the smaller one, assumed that meant it was an 8.2". 30 years later, I still have the bigger gasket, and it didn't fit the 8.2" in my '70 either. Quote Link to comment Share on other sites More sharing options...
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