aquired a rear axle - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**Denee007** · 08-31-2011, 02:17 PM

Hi ya'll,
I traded my previous seat that was in my Apache for this rear axle. It's 55 5/8" from flange to flange, 10bolt, limited slip, setup for disc, obviously for springs, George(the pre owner) said 2.79? darn, forgot! My axle is 58" and I don't know how it is or what ratio it is. I can keep it, modify it to fit, but is it too narrow? Should I just trade it for something else?

Speedbumpauto · 08-31-2011, 04:47 PM

IF.....you're not going to run a bunch of HP and you're OK with the gear ratio, the 1 1/4" per side difference can be made up with different wheel offset IF..you're going to spring for wheels anyway. Cutting off the coil spring mounts is pretty easy and leaf spring pads are available cheap from lots of fabrication places. That would also give you the option to flip the springs under the axle if lowering your ride in in the future. IMO, if you need to farm out the cutting, welding, fabrication and/or you get into gear ratio changes and you start throwing money at this rear end, I'd start with a 12 bolt or even better, a 9 inch, both of which will add value to your truck if you ever need to sell. The 10 bolt, not so much.

mknittle · 08-31-2011, 04:58 PM

what is it out of? it doesnt look like any GM 10 bolt I have seen

Dan Bowles · 08-31-2011, 05:26 PM

The mount for the trans support looks F car but the spring plates look mid size. What is is mounting face to mounting face dimension? F car is like 61". Could be Monte Carlo G car but I'm not sure. Caprice, etc. has the large 5 on 5" pattern, I believe. At least the Buick wagons are.

Kabwe · 08-31-2011, 05:40 PM

It is a 7.5 out of a newer GM car. I had a 1991 Iroc rearend that was the same as that one. It should be posi and the gears are most likely 3:42 but judging from the pic it has the tag and the gear ratio should be on that. If the rearend does not have the tag on it and you want to know the exact gear ratio you can open it up and the ring gear should have a number stamped on it and it looks like this 41:12.
That means the ring gear has 41 teeth and the pinion has 12. Divide the number of ring gear teeth by the number of pinion gear teeth. That will give you the exact gear ratio. For example, the ring gear has 41 teeth, and the pinion has 12. Divide 41 by 12 for a gear ratio of 3:42.

Like was said before it will not handle much hp but a stock to mild small block will be okay.

I hope that helps

mknittle · 08-31-2011, 05:41 PM

the torque arme mount is what I can't figure som monzas had them but they were little tiny rears

**Denee007** · 08-31-2011, 06:02 PM

Well, I have a 12 bolt now with drum, I don't know what shape it's in as I've never driven it(up and down the street once). IT was either this or a set of headers, and I really don't want headers. I"m not much of a horse trader am I! lol Nothing like having another rear axle laying around. I was getting around to take the plate off of mine, just hadn't gotten around to it. I don't think I ever heard what it came out of~ I don't think he new either. I'll call anyway, just called, "82-"83, 3rd generation camaro, 8.2", ok, does that mean anything to ya'll?

**Denee007** · 08-31-2011, 06:06 PM

The only tag on it says, limited slip fluid only, didn't see any other tags.

Kabwe · 08-31-2011, 06:20 PM

Quote:

Originally Posted by Denee007

. I'll call anyway, just called, "82-"83, 3rd generation camaro, 8.2", ok, does that mean anything to ya'll?

He has the year and make correct, but he is incorrect to call it an 8.2. The 8.2 was used on 67-70 Camaro, in late 1971 GM went to what is known as the big 10 bolt the 8.5 that was used until 1981 on the 2 generation Camaro and Firebirds. This now brings us to the 7.5 or 7.625 that was used on the 3rd generation Camaro and Firebirds.

Quote:

Originally Posted by Denee007

The only tag on it says, limited slip fluid only, didn't see any other tags.

You can drain the fuild and read the ring gear.

solidaxel · 08-31-2011, 06:26 PM

I think the one you have in the truck is a better deal if it is not busted!

Kabwe · 08-31-2011, 06:30 PM

Quote:

Originally Posted by solidaxel

I think the one you have in the truck is a better deal if it is not busted!

You got that right, if its a 12 bolt its very strong rearend.
Denee007,

I don't know if you know this but I will share it with you anyway. When we talk about 8.2, 8.5, 7.5 we are talking about the size of the ring gear the 12 bolt has a 8.878 ring gear which is very close to the highly valued Ford 9 inch.

**Denee007** · 08-31-2011, 06:33 PM

figures~ well, I'll hang on to it, put it somewhere out of the way, maybe clean it up, take the cover off etc. If the one in my truck is making noise, I can have it overhauled or whatever they do to them. I can always put it on CL and just get what I can; nothing new. thanks everyone!
dne'

mknittle · 08-31-2011, 07:09 PM

Quote:

Originally Posted by Denee007

figures~ well, I'll hang on to it, put it somewhere out of the way, maybe clean it up, take the cover off etc. If the one in my truck is making noise, I can have it overhauled or whatever they do to them. I can always put it on CL and just get what I can; nothing new. thanks everyone!
dne'

that would be best,

**Denee007** · 08-31-2011, 09:08 PM

I put it on CL, dumb mistake! not my first by any means. I'll ask ya'll next time before I go do something dumb again! ; )

Dan Bowles · 08-31-2011, 09:27 PM

It actually isn't a horrid rear end of the AD trucks. Fits nicely and will handle a mild small block. If you get another one, look for the axles to be flared where they go into the pig. That sometimes indicates the larger ring gear 10 bolts. I've had one in one of mine but it was running a stock 216 so I wasn't sweating the power.

**Denee007** · 08-31-2011, 10:09 PM

I guess I could keep it as a learning project, remove the welds/brackets,, I've just have so much going on at the moment. I'll just try to tuck it out of the way for now; if someone on CL calls me and offers even a tiny offer, I'd let it go. actually looking at it, it looks kind of small where the gears would be, and I really didn't put any thought into it, as the gears are rather low gears(279?) with a 350 turbo tranny.
enough on this~ I messed up, nothing here, move along ; )

tmoble · 08-31-2011, 10:13 PM

since it's a posi you get the ratio easily. block it up so the rotors are off the ground and the yoke can turn. turn the yoke so it's straight up and down, mark one of the rotors at the edge of the caliper bracket. turn the yoke enough time to turn the rotor one complete turn. count the turns of the yoke. just short of 3.5 = 3.42. 3 plus a little = 3.08, 2 and 3/4 = 2.73

tmoble · 09-01-2011, 12:09 AM

If that 12 bolt is out of a Camaro or Firebird it's worth a bunch of money to those guys. Measure the width from wheel mounting surface to WMS and look carefully on the front of the left axle tube for a stamped in code. That little bracket on the passenger indicates it probably spent time in a drag car. Is there one on the left too?

**Denee007** · 09-01-2011, 09:29 AM

T, Mine in my truck is a 12 bolt, the axle in question here is a 10 bolt. No worries, Dave Chapman wants it! If anyone can do somethiing with it, it's Dave! ; )

tmoble · 09-01-2011, 11:36 PM

that's what I was referring, the 12 bolt pictured in post #7. Appears that might be a factory 67-69 Camaro/Firebird rear. big bucks deal to the Camaro/Firebird guys especially if it has a desirable code stamped in.

**Denee007** · 09-02-2011, 02:54 PM

So I have something kind of special in my truck! That's nice for a change! lol

Quote:

Originally Posted by tmoble

that's what I was referring, the 12 bolt pictured in post #7. Appears that might be a factory 67-69 Camaro/Firebird rear. big bucks deal to the Camaro/Firebird guys especially if it has a desirable code stamped in.

Coupeguy2001 · 09-02-2011, 12:35 PM

I have a 1980's 12 bolt truck housing for $50. You could make a custom length rear axle by using a square, mark it, index mark the brake flanges, and cut it to length. Summit Racing will sell you new flanges to slip over the ends and line them up, and take them to a muffler shop to get welded.
The only down side is that custom length axle shafts are around $300 each
Overhauled axles are around $1000 or more ready to ship.
Custom axles are $1800-$4000

hotrodrookie · 09-02-2011, 07:22 PM

Don't feel too bad Denee, I bought the same axle from a junkyard when I first started building my truck. Since then I have bought two others to replace it, haha. I settled on a ford explorer 8.8 rear end, but I still kept the 7.5" camaro rear end like yours to use as a core exchange if I ever buy another rear end from the wrecking yard.

08-31-2011, 02:17 PM	#1
Denee007 Senior Member Join Date: May 2011 Location: Cypress, Tx. Posts: 1,504	aquired a rear axle Hi ya'll, I traded my previous seat that was in my Apache for this rear axle. It's 55 5/8" from flange to flange, 10bolt, limited slip, setup for disc, obviously for springs, George(the pre owner) said 2.79? darn, forgot! My axle is 58" and I don't know how it is or what ratio it is. I can keep it, modify it to fit, but is it too narrow? Should I just trade it for something else?

08-31-2011, 04:47 PM	#2
Speedbumpauto Registered User Join Date: Aug 2011 Location: Tucson, AZ Posts: 917	Re: aquired a rear axle IF.....you're not going to run a bunch of HP and you're OK with the gear ratio, the 1 1/4" per side difference can be made up with different wheel offset IF..you're going to spring for wheels anyway. Cutting off the coil spring mounts is pretty easy and leaf spring pads are available cheap from lots of fabrication places. That would also give you the option to flip the springs under the axle if lowering your ride in in the future. IMO, if you need to farm out the cutting, welding, fabrication and/or you get into gear ratio changes and you start throwing money at this rear end, I'd start with a 12 bolt or even better, a 9 inch, both of which will add value to your truck if you ever need to sell. The 10 bolt, not so much.

08-31-2011, 04:58 PM	#3
mknittle Registered User Join Date: Jul 2011 Location: Auburn ca. Posts: 2,886	Re: aquired a rear axle what is it out of? it doesnt look like any GM 10 bolt I have seen __________________ Mark My GMC build. http://67-72chevytrucks.com/vboard/s...d.php?t=536602

08-31-2011, 05:26 PM	#4
Dan Bowles AD Addict Join Date: Oct 2009 Location: Blissfield, MI Posts: 822	Re: aquired a rear axle The mount for the trans support looks F car but the spring plates look mid size. What is is mounting face to mounting face dimension? F car is like 61". Could be Monte Carlo G car but I'm not sure. Caprice, etc. has the large 5 on 5" pattern, I believe. At least the Buick wagons are.

08-31-2011, 05:40 PM	#5
Kabwe Certified Car Nut Join Date: Jan 2005 Location: Inglewood, California Posts: 3,118	Re: aquired a rear axle It is a 7.5 out of a newer GM car. I had a 1991 Iroc rearend that was the same as that one. It should be posi and the gears are most likely 3:42 but judging from the pic it has the tag and the gear ratio should be on that. If the rearend does not have the tag on it and you want to know the exact gear ratio you can open it up and the ring gear should have a number stamped on it and it looks like this 41:12. That means the ring gear has 41 teeth and the pinion has 12. Divide the number of ring gear teeth by the number of pinion gear teeth. That will give you the exact gear ratio. For example, the ring gear has 41 teeth, and the pinion has 12. Divide 41 by 12 for a gear ratio of 3:42. Like was said before it will not handle much hp but a stock to mild small block will be okay. I hope that helps

08-31-2011, 05:41 PM	#6
mknittle Registered User Join Date: Jul 2011 Location: Auburn ca. Posts: 2,886	Re: aquired a rear axle the torque arme mount is what I can't figure som monzas had them but they were little tiny rears __________________ Mark My GMC build. http://67-72chevytrucks.com/vboard/s...d.php?t=536602

08-31-2011, 06:02 PM	#7
Denee007 Senior Member Join Date: May 2011 Location: Cypress, Tx. Posts: 1,504	Re: aquired a rear axle Well, I have a 12 bolt now with drum, I don't know what shape it's in as I've never driven it(up and down the street once). IT was either this or a set of headers, and I really don't want headers. I"m not much of a horse trader am I! lol Nothing like having another rear axle laying around. I was getting around to take the plate off of mine, just hadn't gotten around to it. I don't think I ever heard what it came out of~ I don't think he new either. I'll call anyway, just called, "82-"83, 3rd generation camaro, 8.2", ok, does that mean anything to ya'll?

08-31-2011, 06:06 PM	#8
Denee007 Senior Member Join Date: May 2011 Location: Cypress, Tx. Posts: 1,504	Re: aquired a rear axle The only tag on it says, limited slip fluid only, didn't see any other tags.

08-31-2011, 06:26 PM	#10
solidaxel Registered User Join Date: Dec 2002 Location: Cactus Patch So. Az Posts: 4,749	Re: aquired a rear axle I think the one you have in the truck is a better deal if it is not busted! __________________ 53 TuTone Extended Cab 350 4-Spd 3:08 (SOLD) 53 Chevy Moldy pearl green ZZ-4 4L60E 9" 3:25 55 GMC 1st Black Mll (ZZ4) ZZ6 TKO 600 5 sp 3:73 62 Solidaxle Corvette Roman Red (327 340hp 4spd 3:36) C4 & C5 suspension tube chassis LS 3 4L70E 65 Corvette Coupe 327 350hp 4spd 4:11 78 Black Silverado SWB (350/350) 5.3 & 4L60E 3:42 2000 S-Type 3.0 (wife cruiser) 2003 GMC SCSB 5.3 4L60E 3:42

08-31-2011, 06:33 PM	#12
Denee007 Senior Member Join Date: May 2011 Location: Cypress, Tx. Posts: 1,504	Re: aquired a rear axle figures~ well, I'll hang on to it, put it somewhere out of the way, maybe clean it up, take the cover off etc. If the one in my truck is making noise, I can have it overhauled or whatever they do to them. I can always put it on CL and just get what I can; nothing new. thanks everyone! dne'

08-31-2011, 09:08 PM	#14
Denee007 Senior Member Join Date: May 2011 Location: Cypress, Tx. Posts: 1,504	Re: aquired a rear axle I put it on CL, dumb mistake! not my first by any means. I'll ask ya'll next time before I go do something dumb again! ; )

08-31-2011, 09:27 PM	#15
Dan Bowles AD Addict Join Date: Oct 2009 Location: Blissfield, MI Posts: 822	Re: aquired a rear axle It actually isn't a horrid rear end of the AD trucks. Fits nicely and will handle a mild small block. If you get another one, look for the axles to be flared where they go into the pig. That sometimes indicates the larger ring gear 10 bolts. I've had one in one of mine but it was running a stock 216 so I wasn't sweating the power.

08-31-2011, 10:09 PM	#16
Denee007 Senior Member Join Date: May 2011 Location: Cypress, Tx. Posts: 1,504	Re: aquired a rear axle I guess I could keep it as a learning project, remove the welds/brackets,, I've just have so much going on at the moment. I'll just try to tuck it out of the way for now; if someone on CL calls me and offers even a tiny offer, I'd let it go. actually looking at it, it looks kind of small where the gears would be, and I really didn't put any thought into it, as the gears are rather low gears(279?) with a 350 turbo tranny. enough on this~ I messed up, nothing here, move along ; )

08-31-2011, 10:13 PM	#17
tmoble Registered User Join Date: Feb 2009 Location: Glendale, Az Posts: 1,062	Re: aquired a rear axle since it's a posi you get the ratio easily. block it up so the rotors are off the ground and the yoke can turn. turn the yoke so it's straight up and down, mark one of the rotors at the edge of the caliper bracket. turn the yoke enough time to turn the rotor one complete turn. count the turns of the yoke. just short of 3.5 = 3.42. 3 plus a little = 3.08, 2 and 3/4 = 2.73

09-01-2011, 12:09 AM	#18
tmoble Registered User Join Date: Feb 2009 Location: Glendale, Az Posts: 1,062	Re: aquired a rear axle If that 12 bolt is out of a Camaro or Firebird it's worth a bunch of money to those guys. Measure the width from wheel mounting surface to WMS and look carefully on the front of the left axle tube for a stamped in code. That little bracket on the passenger indicates it probably spent time in a drag car. Is there one on the left too?



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09-01-2011, 09:29 AM	#19
Denee007 Senior Member Join Date: May 2011 Location: Cypress, Tx. Posts: 1,504	Re: aquired a rear axle T, Mine in my truck is a 12 bolt, the axle in question here is a 10 bolt. No worries, Dave Chapman wants it! If anyone can do somethiing with it, it's Dave! ; )

09-01-2011, 11:36 PM	#20
tmoble Registered User Join Date: Feb 2009 Location: Glendale, Az Posts: 1,062	Re: aquired a rear axle that's what I was referring, the 12 bolt pictured in post #7. Appears that might be a factory 67-69 Camaro/Firebird rear. big bucks deal to the Camaro/Firebird guys especially if it has a desirable code stamped in.

09-02-2011, 12:35 PM	#22
Coupeguy2001 Registered User Join Date: Aug 2011 Location: phoenix az Posts: 723	Re: aquired a rear axle I have a 1980's 12 bolt truck housing for $50. You could make a custom length rear axle by using a square, mark it, index mark the brake flanges, and cut it to length. Summit Racing will sell you new flanges to slip over the ends and line them up, and take them to a muffler shop to get welded. The only down side is that custom length axle shafts are around $300 each Overhauled axles are around $1000 or more ready to ship. Custom axles are $1800-$4000 Last edited by Coupeguy2001; 09-02-2011 at 12:42 PM.

09-02-2011, 07:22 PM	#23
hotrodrookie Registered User Join Date: Sep 2008 Location: Sacramento Posts: 425	Re: aquired a rear axle Don't feel too bad Denee, I bought the same axle from a junkyard when I first started building my truck. Since then I have bought two others to replace it, haha. I settled on a ford explorer 8.8 rear end, but I still kept the 7.5" camaro rear end like yours to use as a core exchange if I ever buy another rear end from the wrecking yard.

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