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Hey all!!!!!
Have an 1980 442 which I am building for my son. Have built 350 for her 450hp 480tq, will be mating with a built 200r4.
Now with that bit of punch, the old 7.5 won't hold very long. I have a complete diff with posi, is it possible to rebuild these so they can take a beating?
Been told if I can find an 8.5 for cheap, go that route. For the amount they are selling, been told to build what I have.
Any ideas what can been done to beef up 7.5??
Thanks
The only 8.5 axles that bolt into these cars are the ones used in the 84 H/O, the 85-87 442, and the 85-87 GN. If you do find one for sale, expect to pay stupid money for it.
It won't last long under that power. A solid pinion spacer, girdle cover, a Trutrac worm gear posi eliminates small, explosive spider gears along with Moser 28 spline axles is the 7.5" rear best hope. There is a guy here in Saskatchewan, Melfort to be exact, who converts Ford 9" housings to fit in G bodies. Go to the rear diff page. http://therocketshop.blogspot.com/?m=1
Monzaz is a differential builder, who is a member here. He has posted upgrades that can be made to that rear. Some Camaros have rears with stronger innards. Those innards will fit in your stock housing. You should contact him . coppied this from one of his posts"10 bolt 7.5 G-body rears were 26 spline axles and can be upgraded to 28 spline axles with swapping out a 1990-2002 7.625 posi or open carrier. and then buy the correct 28 spline axle shafts If you are mostly street bound and above the 12 second mark at the track the 7.5 upgraded rear will do the job just fine.I can get anyone the parts to do these conversions". Contact him thru pm or JD racing in Richfield Ohio
Yes, a Torsen(worm gear) or Eaton clutch posi and either 3.23 or 3.42 gears was the usual option in the 1998 to 2002 Camaro. Westman Salvage might have one, although some came with the same 2.73 gears as your car. The Moser or GN 28 spline axles are needed as said. Contact the guy in Melfort, he quite often has gears and third members as well for the 9". Then you have 0 worries with a 9", the 7.5" sucks. I exploded spider gears, took out the pinion and girdle cover. I also broke a Powertrax No Slip, not the only one.
Last edited by olds 307 and 403; Dec 9, 2019 at 08:12 AM.
Yes, a Torsen(worm gear) or Eaton clutch posi and either 3.23 or 3.42 gears was the usual option in the 1998 to 2002 Camaro. Westman Salvage might have one, although some came with the same 2.73 gears as your car. The Moser or GN 28 spline axles are needed as said. Contact the guy in Melfort, he quite often has gears and third members as well for the 9". Then you have 0 worries with a 9", the 7.5" sucks. I exploded spider gears, took out the pinion and girdle cover. I also broke a Powertrax No Slip, not the only one.
He has everything but the housing. I need to track 1 down
Monzaz is a differential builder, who is a member here. He has posted upgrades that can be made to that rear. Some Camaros have rears with stronger innards. Those innards will fit in your stock housing. You should contact him . coppied this from one of his posts"10 bolt 7.5 G-body rears were 26 spline axles and can be upgraded to 28 spline axles with swapping out a 1990-2002 7.625 posi or open carrier. and then buy the correct 28 spline axle shafts If you are mostly street bound and above the 12 second mark at the track the 7.5 upgraded rear will do the job just fine.I can get anyone the parts to do these conversions". Contact him thru pm or JD racing in Richfield Ohio
Okay thanks, will ask some questions.
This is my son's car, so I will assume the rear end will take a beating.
It won't last long under that power. A solid pinion spacer, girdle cover, a Trutrac worm gear posi eliminates small, explosive spider gears along with Moser 28 spline axles is the 7.5" rear best hope. There is a guy here in Saskatchewan, Melfort to be exact, who converts Ford 9" housings to fit in G bodies. Go to the rear diff page. http://therocketshop.blogspot.com/?m=1
The 9 inch, that is the so called pumpkin rear end?
One of the biggest questions is WHERE the car will be driven...Street driving really does not hold torque and power and you can usually get away with ANY rear to to the job.
Stick shift cars will usually put more of a hurt on drive line parts and especially the way customers drive them banging gears popping the clutch in every gear thinking it will make the car go faster...lol.
Tally up the parts cost and see where you are - If the car is a KEEPER more than 5 years Wait and get the bigger rear... If this is a weekend might sell for school college money just build the 7.5 and roll he dice
I just build the 12 bolt Moser rears for the G-bodies as like someone else said for the amount they want for a GN or 442 8.5 rear you might as well spend another 500.00 and get it all
Correct width bolt in with out changing control arms, any ratio any posi 1/4" thick HD tubing and casting super thick main bearing caps are twice as thick as stock cap bolt are larger and caps machine screw
Remember you can have all the best parts in a engine Trans and rear...BUT if you do not install them correctly...It will all be junk quickly.
Play with big boy toys you better have the money to play....
I dont expect he will end up selling it ever. His grad gift from me, but who knows. If ever comes down to it, would buy it back before he would sell it.
So the story so far, I am about 14,000 into the engine, another 4500 for the transmission and now the drive shaft and rear end. If I could find a GN for 500 then I be okay with it. But 1500 is a bit much, bite the bullet and go different route. Looking at modified a ford 9 inch but dont care for the pumpkin. Think I might modify a ford 8.8" and put the ford 9" tubes in it and go from there.
And then again, in the new year may change my mind. Where did you buy that rear end?
You have 14000.00 into a 350? (MUST BE some serious stuff)
and 4500 in a 200r4?
I thought 3250.00 for a FULL out race Power glide SFI race case trans brake alloy input shaft set-up was way out of wack? (I just did not have time to wait for a local to build me one...)
If you spent that much in a motor and trans...You should NOT start getting cheap... Just saying...Finish the car right as just one weak link and all that money is sitting on the side of the road.
That rear pictured is 2350 cash! (who knows what prices will go up next year?) ALL new everything.
You have 14000.00 into a 350? (MUST BE some serious stuff)
and 4500 in a 200r4?
I thought 3250.00 for a FULL out race Power glide SFI race case trans brake alloy input shaft set-up was way out of wack? (I just did not have time to wait for a local to build me one...)
If you spent that much in a motor and trans...You should NOT start getting cheap... Just saying...Finish the car right as just one weak link and all that money is sitting on the side of the road.
That rear pictured is 2350 cash! (who knows what prices will go up next year?) ALL new everything.
Jim
I am up from Canada, little more costly to get parts up here. Lol
Mark from here helped me with the build, got some nice parts. Out of the $14,000, $8500 was machining. Everything was machined, I didn't cheap out in the build.
Transmission is $3300 us. Shipping and money conversion to Canada $4500. What sucks about being up here.
Did you build that rear end or you bought it built?
GOOD Labor ain't cheap. As long as it tuned out correct you will be fine.
Forgot it was Oldsmobile engine too.
I come from the Low Priced Chevy neighborhood...lol.
Jim
ALL I DO IS BUILD REAR ENDS. We are always fixing the set-ups on Moser rears and many other BIG NAME rear end sellers. Backlash wrong pattern wrong noisy rears etc. They can make the housings and sell the parts BUT LAbor on the set-ups are JUNK... Like I said GOOD labor ain't cheap.
