'77 leaf rear into a '69 coil rear?????? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Power Trip · 06-22-2003, 10:18 PM

Hello I have been trying to swap my truck over to the popular 5 0n 5 lbot pattern. I have already put 5 lug disc on the front now time for the rear. The question is I have a '77 rearend from my brothers truck but its leaf. How hard would it be to cut the mounts off of mine and weld them onto the new rear. If that wont work what are some other ideas that you have. By the way my wallets on a diet and I have an excelent welder on hand. Thanks in advance for your help Jim

rambler · 06-23-2003, 10:40 AM

I've asked this question before in the past, From what I learned it should work, but you have to make sure everything is lined up correctly. I'm needing another rear end for my 72, and thought about the same thing, but paying a welder I can get a used 72 coil from a couple of guys in KC that part out our year of trucks,, I just missed a 72 posi.. (dang, still mad about that), $$$ is always the issue as well..

tom hand · 06-23-2003, 11:13 AM

There is a kit just for this. I comes with correct mounts and an extra long tracking bar that you need because you have to put the mount on the axle tube. You can find a pic of it in the Chevy Duty catilog

Longhorn Man · 06-23-2003, 05:51 PM

Some one was saying (please don't quote me on this) that you can slide the axles into your 69 rear end, and use the drums off the donor...
Is that right?
I know you can use the axles, but the drums will need to be a bit wider to make up the differance.

crazy longhorn · 06-23-2003, 07:10 PM

The 70 diff should be a direct swap for the 71 up axles, but the 69 diff will be a little narrower. i have heard of swapping the longer axles in the narrow diff, & using the wider drums to make up the difference........but I wouldnt try it(I am a picky SOB!). You can get NEW Moser axles with studs, & shipped for about $260

crazyL

Power Trip · 06-23-2003, 11:20 PM

well longhorn if i could do that it would be great. right now i'm not so picky i have a 3.08 rear in there now and that would go great with my motor.So just swap axles huh? Sounds good.

Tom thanks for pointingthat out i did not see it that still aint a bad deal if theaxle swap dont work.

thanks for the ideas you guys r great Jim

Longhorn Man · 06-23-2003, 11:49 PM

Like I said...don't quote me on that.
Get it verified first...I'm sure some one on here knows...

**Desert Rat** · 06-24-2003, 02:33 AM

71 and up axels will fit in a 1970 rearend but not a 1969 they are narrower.with a a torch and welder anything will fit,just dont cut and weld in one spot for too long,and warped the axel housings.get your pinion angle right.

06-22-2003, 10:18 PM	#1
Power Trip Got Caddy? Join Date: Jul 2002 Location: DeSoto,MO. Posts: 115	'77 leaf rear into a '69 coil rear?????? Hello I have been trying to swap my truck over to the popular 5 0n 5 lbot pattern. I have already put 5 lug disc on the front now time for the rear. The question is I have a '77 rearend from my brothers truck but its leaf. How hard would it be to cut the mounts off of mine and weld them onto the new rear. If that wont work what are some other ideas that you have. By the way my wallets on a diet and I have an excelent welder on hand. Thanks in advance for your help Jim __________________ 1969 c-10 swb fleetside with dreams of a caddy 500 Bagged shaved and rollin' on 18's Future bumper sticker. Looks like a chevy, runs like a caddy!

06-23-2003, 10:40 AM	#2
rambler MOVE OVER Join Date: Jun 2002 Location: Warrensburg, MO Posts: 5,470	I've asked this question before in the past, From what I learned it should work, but you have to make sure everything is lined up correctly. I'm needing another rear end for my 72, and thought about the same thing, but paying a welder I can get a used 72 coil from a couple of guys in KC that part out our year of trucks,, I just missed a 72 posi.. (dang, still mad about that), $$$ is always the issue as well.. __________________ No matter where you are..... There you are... Buckaroo Banzi

06-23-2003, 11:13 AM	#3
tom hand CCRider Join Date: Feb 2000 Location: Olive Branch,MS,USA Posts: 2,232	There is a kit just for this. I comes with correct mounts and an extra long tracking bar that you need because you have to put the mount on the axle tube. You can find a pic of it in the Chevy Duty catilog __________________ 72 GMC Sierra SWB almost finished---- 84 Softail Olive Branch MS

06-23-2003, 07:10 PM	#5
crazy longhorn Fabricate till you "puke" Join Date: Jun 2002 Location: Ill Posts: 9,403	The 70 diff should be a direct swap for the 71 up axles, but the 69 diff will be a little narrower. i have heard of swapping the longer axles in the narrow diff, & using the wider drums to make up the difference........but I wouldnt try it(I am a picky SOB!). You can get NEW Moser axles with studs, & shipped for about $260 crazyL __________________ 69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....

06-23-2003, 11:20 PM	#6
Power Trip Got Caddy? Join Date: Jul 2002 Location: DeSoto,MO. Posts: 115	well longhorn if i could do that it would be great. right now i'm not so picky i have a 3.08 rear in there now and that would go great with my motor.So just swap axles huh? Sounds good. Tom thanks for pointingthat out i did not see it that still aint a bad deal if theaxle swap dont work. thanks for the ideas you guys r great Jim __________________ 1969 c-10 swb fleetside with dreams of a caddy 500 Bagged shaved and rollin' on 18's Future bumper sticker. Looks like a chevy, runs like a caddy!

06-23-2003, 05:51 PM	#4
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Some one was saying (please don't quote me on this) that you can slide the axles into your 69 rear end, and use the drums off the donor... Is that right? I know you can use the axles, but the drums will need to be a bit wider to make up the differance.

06-23-2003, 11:49 PM	#7
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Like I said...don't quote me on that. Get it verified first...I'm sure some one on here knows...

06-24-2003, 02:33 AM	#8
Desert Rat Senior Member Join Date: Dec 1999 Location: Darrington, Washington Posts: 3,963	71 and up axels will fit in a 1970 rearend but not a 1969 they are narrower.with a a torch and welder anything will fit,just dont cut and weld in one spot for too long,and warped the axel housings.get your pinion angle right.



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