Rear end swap question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**lock** · 05-16-2003, 02:01 PM

I recently pulled a 10 bolt rear end from my 86 IROC... it has 3.73 and Auburn Pro posi in it. Id really like to swap this into my 68 C10 so that I get the 3.73's and 5 lug. Will this rear end swap in? Anything special I need to do.. Im wondering how the truck arms will mount. My 68 is a coil spring setup.

Thanks!

Roberty · 05-16-2003, 03:05 PM

How does it compare in width to the one in your truck? As far as the brakets go I saw a link on the board here for the weld on brakets to be able to convert a different rearend to fit in our trucks. I didn't save the web address though.
Robert

tom hand · 05-16-2003, 03:38 PM

Chevyduty and others sell kits to install non-coil spring rearends in our trucks. Is it wide enough? The rear end is a five bolt pattern but it is 5 on 4 3/4 and our trucks are 5 on 5 so you would need to have your front rotors redrilled to have the same pattern all the way around. Good luck

**lock** · 05-16-2003, 08:07 PM

Ive converted the front to disc brakes with a setup from a 75 truck.

70c10 · 05-16-2003, 09:03 PM

lock, how much of that front end did you use?

Blue Beard · 05-16-2003, 10:28 PM

Is the bolt pattern the same on the car?

Thought they were different that the trucks...........

69c10Lwb · 05-16-2003, 11:16 PM

the bolt pattern is a 4 3/4 vs a 5.0 , but it is also a 7.5 ring gear most likely unless you stepped up to a aftermarket rear axle. what im trying to say is that you are going to a weaker rear axle . true the auburn posi is a good posi,but youre still using a small axle and it has the 4 3/4 bolt pattern. so it really comes down to how much are you willing to modify to make it work. plus the truck is heavier than the camaro it came from and that will affect the life span if you run the truck hard especially.....hope this helps and good luck.

**lock** · 05-17-2003, 12:00 AM

I used spindles and everything mounted form the truck on the front end. The iroc is 320hp, 410 torque at rear wheels. Yes the 10 bolt is suspect but this one has proven strong for me so far. My truck isnt as strong as the car. Im not concerned about tearing up the 10 bolt, rather jsut if I can get it in.

Ill check the bolt pattern this weekend and see.

Thanks for all the replies everyone!

onetoncrewcab · 05-17-2003, 08:48 AM

Here is a link to the thread I had started a couple of weeks ago. This might be the one Roberty is thinking of too.

http://64.246.42.114/vboard/showthre...threadid=52681

I have an 86 Sub that I'm pulling the rear axle out of. I knew there was new brackets available and someone on here knew about them too. But one member said I can just switch the axle shafts. I'm not sure of that yet. I think the Sub axle is longer.

I HAVE to get my wife's kitchen done before I can go work on the truck. Then I hope to get some progress pics on it.
Later
Mike

05-16-2003, 02:01 PM	#1
lock Insert funny comment. Join Date: Dec 1999 Location: Concord NC Posts: 621	Rear end swap question I recently pulled a 10 bolt rear end from my 86 IROC... it has 3.73 and Auburn Pro posi in it. Id really like to swap this into my 68 C10 so that I get the 3.73's and 5 lug. Will this rear end swap in? Anything special I need to do.. Im wondering how the truck arms will mount. My 68 is a coil spring setup. Thanks! __________________ ------------ - Mark -My Build Thread... -68 C10, LT1 - Undergoing Frame off resto -86 IROC-Z T72 turbo 355, M6 -70 Camaro http://www.iroc-ss.com

05-16-2003, 03:05 PM	#2
Roberty Hot Damn - Here I Am!! Join Date: Feb 2000 Location: Ringgold, Georgia Posts: 726	How does it compare in width to the one in your truck? As far as the brakets go I saw a link on the board here for the weld on brakets to be able to convert a different rearend to fit in our trucks. I didn't save the web address though. Robert __________________ My vehicles: '90 Silverado Sport '71 Chevelle SS Convertible '70 C-10 - My Grandfather bought it new - original un-restored

05-16-2003, 03:38 PM	#3
tom hand CCRider Join Date: Feb 2000 Location: Olive Branch,MS,USA Posts: 2,232	Chevyduty and others sell kits to install non-coil spring rearends in our trucks. Is it wide enough? The rear end is a five bolt pattern but it is 5 on 4 3/4 and our trucks are 5 on 5 so you would need to have your front rotors redrilled to have the same pattern all the way around. Good luck __________________ 72 GMC Sierra SWB almost finished---- 84 Softail Olive Branch MS

05-16-2003, 08:07 PM	#4
lock Insert funny comment. Join Date: Dec 1999 Location: Concord NC Posts: 621	Ive converted the front to disc brakes with a setup from a 75 truck. __________________ ------------ - Mark -My Build Thread... -68 C10, LT1 - Undergoing Frame off resto -86 IROC-Z T72 turbo 355, M6 -70 Camaro http://www.iroc-ss.com

05-16-2003, 09:03 PM	#5
70c10 67-72 Addict! Join Date: Feb 2002 Location: The TAX State! Posts: 7,856	lock, how much of that front end did you use? __________________ Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads

05-16-2003, 10:28 PM	#6
Blue Beard Registered User Join Date: Jan 2003 Location: Washington State Posts: 8,831	Is the bolt pattern the same on the car? Thought they were different that the trucks........... __________________ 1970 Chev CST 2003 Harley Fatboy 1975 Chevrolet Step Van 1956 Chev Bel Air 1977 Blazer 2WD For Sale $3000.00 1978 Blazer 2WD For Sale $7000.00 1978 Silverado 2005 Monte Carlo

05-16-2003, 11:16 PM	#7
69c10Lwb Registered User Join Date: Feb 2003 Location: san antonio,texas Posts: 37	86 iroc rear end the bolt pattern is a 4 3/4 vs a 5.0 , but it is also a 7.5 ring gear most likely unless you stepped up to a aftermarket rear axle. what im trying to say is that you are going to a weaker rear axle . true the auburn posi is a good posi,but youre still using a small axle and it has the 4 3/4 bolt pattern. so it really comes down to how much are you willing to modify to make it work. plus the truck is heavier than the camaro it came from and that will affect the life span if you run the truck hard especially.....hope this helps and good luck. __________________ 1973 pro-street nova back halved 632 cid 9inchford, disc brakes,2stges of spray,t-400 w/brake . almost done. 1952 chevy pick up soon to have a 468 bbc (hopefully momma will be happy with it and let me play with my toys more) nds.1983 ford bronco 400m auto matic 4wheel drive (war wagon, seen many battles and lost most ) another 1969 lwb project. suspension ?? motor ?? driveline ?? when you get it for free you dont turn it down... right???? 1992 suburban 4x4 no mods yet

05-17-2003, 12:00 AM	#8
lock Insert funny comment. Join Date: Dec 1999 Location: Concord NC Posts: 621	I used spindles and everything mounted form the truck on the front end. The iroc is 320hp, 410 torque at rear wheels. Yes the 10 bolt is suspect but this one has proven strong for me so far. My truck isnt as strong as the car. Im not concerned about tearing up the 10 bolt, rather jsut if I can get it in. Ill check the bolt pattern this weekend and see. Thanks for all the replies everyone! __________________ ------------ - Mark -My Build Thread... -68 C10, LT1 - Undergoing Frame off resto -86 IROC-Z T72 turbo 355, M6 -70 Camaro http://www.iroc-ss.com

05-17-2003, 08:48 AM	#9
onetoncrewcab One of my kids. Cute eh? Join Date: Oct 2001 Location: Mitchell, SD Posts: 1,286	Here is a link to the thread I had started a couple of weeks ago. This might be the one Roberty is thinking of too. http://64.246.42.114/vboard/showthre...threadid=52681 I have an 86 Sub that I'm pulling the rear axle out of. I knew there was new brackets available and someone on here knew about them too. But one member said I can just switch the axle shafts. I'm not sure of that yet. I think the Sub axle is longer. I HAVE to get my wife's kitchen done before I can go work on the truck. Then I hope to get some progress pics on it. Later Mike __________________ If a kid asks where rain comes from, I think a cute thing to tell him is “God is crying.” And if he asks why God is crying, another cute thing to tell him is “Probably because of something you did. John 3:16 2006 Chevy HHR 2000 Dodge Durango 1985 Jeep CJ-7 1970 Chevy Pickup

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