Axle swap compatibility? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Sklptrljay · 07-14-2014, 12:14 PM

I found a rear end that is from a 72 Blazer. It's a 6 lug. Will 5 lug axles from a 71-72 fit in this rear end?

Sklptrljay · 07-15-2014, 11:13 AM

Bump.

Anybody know?

fp1967 · 07-15-2014, 04:44 PM

Yes, they will fit.

Sklptrljay · 07-15-2014, 10:40 PM

Thanks fp1967. Is something you have done before? Is it simply a straight swap or are there any modifications to be made?

Steve Cole · 07-16-2014, 08:37 AM

Were Blazers running 6 lugs in 72? I know the trucks were not. You should measure your rear end to be sure it's not an earlier, more narrow one. Swapping axles in trucks is an easy process, just take your time and don't disturb the spider gears. Do a search here, there is a good write-up on doing this.

imjeff · 07-16-2014, 09:15 AM

K trucks were 6 lug in 72.

Sklptrljay · 07-16-2014, 06:50 PM

Here are some pictures the guy sent me about this rear end. He is 2 hours away so I haven't seen it myself. He snapped these before he went to work so it's all I have right now.

I would like to see a pic with the carrier rotated about 90 degrees because I don't see any clutches, so It looks like an open. But...I've never seen gear markings on the carrier like this. It is 3.73, and supposed to be from a 4WD. Can anyone identify this style?

imjeff · 07-16-2014, 07:32 PM

Wow! Those ring gear teeth look hammered and that carriage looks like it was attacked by a ring gear! I don't know if it's worth four hours of drive time, let alone cash. Looks like you would need to replace everything in the case and, by the looks of the carriage, maybe the housing as well. Please follow up if he tells you what happened to it.

Oldtruckfanatic · 07-16-2014, 07:44 PM

Looks like it lost a pinion bearing or the nut backed off. I wouldnt buy that. It would cost less to buy a better rear end than rebuild that one.

Sklptrljay · 07-16-2014, 10:35 PM

Shows how smart I am. I was looking at it on my phone and I was thinking it was some different kind of carrier. Now that I looked at it close up on a computer screen I can see it's all gnarled.

Well, back to the drawing board. I'll find one eventually.

07-14-2014, 12:14 PM	#1
Sklptrljay Registered User Join Date: Apr 2012 Location: Stillwater, Oklahoma Posts: 874	Axle swap compatibility? I found a rear end that is from a 72 Blazer. It's a 6 lug. Will 5 lug axles from a 71-72 fit in this rear end? __________________ 1971 C/10 SWB, 15x8 Rallys, 4.5" X 7" static drop, C-notched, 350/350, 3.73 Posi. .........A 383 and Gear Vendors are on my bucket list. 1972 GMC 4X4 K1500 Survivor - Sold No matter what problems life throws at you, your time on Earth can be incredibly fulfilling and rewarding.....if you just lower your expectations. -Phil Dunphy

07-15-2014, 11:13 AM	#2
Sklptrljay Registered User Join Date: Apr 2012 Location: Stillwater, Oklahoma Posts: 874	Re: Axle swap compatibility? Bump. Anybody know? __________________ 1971 C/10 SWB, 15x8 Rallys, 4.5" X 7" static drop, C-notched, 350/350, 3.73 Posi. .........A 383 and Gear Vendors are on my bucket list. 1972 GMC 4X4 K1500 Survivor - Sold No matter what problems life throws at you, your time on Earth can be incredibly fulfilling and rewarding.....if you just lower your expectations. -Phil Dunphy

07-15-2014, 04:44 PM	#3
fp1967 Registered User Join Date: Aug 2012 Location: U.P. of Michigan Posts: 115	Re: Axle swap compatibility? Yes, they will fit.

07-15-2014, 10:40 PM	#4
Sklptrljay Registered User Join Date: Apr 2012 Location: Stillwater, Oklahoma Posts: 874	Re: Axle swap compatibility? Thanks fp1967. Is something you have done before? Is it simply a straight swap or are there any modifications to be made? __________________ 1971 C/10 SWB, 15x8 Rallys, 4.5" X 7" static drop, C-notched, 350/350, 3.73 Posi. .........A 383 and Gear Vendors are on my bucket list. 1972 GMC 4X4 K1500 Survivor - Sold No matter what problems life throws at you, your time on Earth can be incredibly fulfilling and rewarding.....if you just lower your expectations. -Phil Dunphy

07-16-2014, 08:37 AM	#5
Steve Cole Registered User Join Date: May 2012 Location: Faith,NC Posts: 1,626	Re: Axle swap compatibility? Were Blazers running 6 lugs in 72? I know the trucks were not. You should measure your rear end to be sure it's not an earlier, more narrow one. Swapping axles in trucks is an easy process, just take your time and don't disturb the spider gears. Do a search here, there is a good write-up on doing this.

07-16-2014, 09:15 AM	#6
imjeff Registered User Join Date: Feb 2008 Location: Tacoma Washington Posts: 890	Re: Axle swap compatibility? K trucks were 6 lug in 72. __________________ I know a guy who's addicted to brake fluid. He says he can stop any time. 72 K10 396 75 Cj5 MPI 350 Chev 67 Chevelle 396, 4 speed 74 FXE 08 Tahoe

07-16-2014, 06:50 PM	#7
Sklptrljay Registered User Join Date: Apr 2012 Location: Stillwater, Oklahoma Posts: 874	Re: Axle swap compatibility? Here are some pictures the guy sent me about this rear end. He is 2 hours away so I haven't seen it myself. He snapped these before he went to work so it's all I have right now. I would like to see a pic with the carrier rotated about 90 degrees because I don't see any clutches, so It looks like an open. But...I've never seen gear markings on the carrier like this. It is 3.73, and supposed to be from a 4WD. Can anyone identify this style? Attached Images __________________ 1971 C/10 SWB, 15x8 Rallys, 4.5" X 7" static drop, C-notched, 350/350, 3.73 Posi. .........A 383 and Gear Vendors are on my bucket list. 1972 GMC 4X4 K1500 Survivor - Sold No matter what problems life throws at you, your time on Earth can be incredibly fulfilling and rewarding.....if you just lower your expectations. -Phil Dunphy

07-16-2014, 07:32 PM	#8
imjeff Registered User Join Date: Feb 2008 Location: Tacoma Washington Posts: 890	Re: Axle swap compatibility? Wow! Those ring gear teeth look hammered and that carriage looks like it was attacked by a ring gear! I don't know if it's worth four hours of drive time, let alone cash. Looks like you would need to replace everything in the case and, by the looks of the carriage, maybe the housing as well. Please follow up if he tells you what happened to it. __________________ I know a guy who's addicted to brake fluid. He says he can stop any time. 72 K10 396 75 Cj5 MPI 350 Chev 67 Chevelle 396, 4 speed 74 FXE 08 Tahoe

07-16-2014, 07:44 PM	#9
Oldtruckfanatic Truck junkie Join Date: May 2006 Location: Reno NV Posts: 697	Re: Axle swap compatibility? Looks like it lost a pinion bearing or the nut backed off. I wouldnt buy that. It would cost less to buy a better rear end than rebuild that one.

07-16-2014, 10:35 PM	#10
Sklptrljay Registered User Join Date: Apr 2012 Location: Stillwater, Oklahoma Posts: 874	Re: Axle swap compatibility? Shows how smart I am. I was looking at it on my phone and I was thinking it was some different kind of carrier. Now that I looked at it close up on a computer screen I can see it's all gnarled. Well, back to the drawing board. I'll find one eventually. __________________ 1971 C/10 SWB, 15x8 Rallys, 4.5" X 7" static drop, C-notched, 350/350, 3.73 Posi. .........A 383 and Gear Vendors are on my bucket list. 1972 GMC 4X4 K1500 Survivor - Sold No matter what problems life throws at you, your time on Earth can be incredibly fulfilling and rewarding.....if you just lower your expectations. -Phil Dunphy



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