Will 73-87 diffs fit? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

shocker · 10-10-2011, 12:20 AM

Will 73-87 3/4 ton 4x4 diffs fit into a 1972 blazer without mods? What mods are required?

turp mcspray · 10-10-2011, 09:19 AM

Front will bolt in, rear will need spring perches and shock mounts moved.

Critter · 10-16-2011, 04:14 PM

A 1 ton rear axle from the 80's models will bolt in as far as spring perch width goes (1 ton is narrower than a 3/4 ton). One thing to keep in mind when putting ANY 3/4 ton or 1 ton rear axle in your 1/2 ton is the axle tubes of the heavier axles will be of a larger diameter than your factory 12 bolt rear. This isn't the end of the world, but you will need to buy/build new spring plates and U bolts.

This is a great way to go.

shocker · 10-16-2011, 05:32 PM

thanx for the help and info guys!

*SILVER_WS6* · 10-16-2011, 07:17 PM

I actually need to rebuild my 72 rear. Im not sure anymore what it is. I know its stock. Should just need wheel bearings and prob the carrier and pinion. Any ideas or numbers?

10-10-2011, 12:20 AM	#1
shocker Registered User Join Date: Dec 2009 Location: edmonton ab Posts: 73	Will 73-87 diffs fit? Will 73-87 3/4 ton 4x4 diffs fit into a 1972 blazer without mods? What mods are required? __________________ formerly cooter

10-10-2011, 09:19 AM	#2
turp mcspray Registered User Join Date: May 2007 Location: Rapid City South Dakota Posts: 2,359	Re: Will 73-87 diffs fit? Front will bolt in, rear will need spring perches and shock mounts moved. __________________ Turp Mcspray New life for an old 2wd, farm blazer http://67-72chevytrucks.com/vboard/s...d.php?t=505987 My Blazer build http://67-72chevytrucks.com/vboard/s...d.php?t=342299

10-16-2011, 04:14 PM	#3
Critter Future TOTM Winner Join Date: Aug 2006 Location: Bulverde, TX Posts: 2,692	Re: Will 73-87 diffs fit? A 1 ton rear axle from the 80's models will bolt in as far as spring perch width goes (1 ton is narrower than a 3/4 ton). One thing to keep in mind when putting ANY 3/4 ton or 1 ton rear axle in your 1/2 ton is the axle tubes of the heavier axles will be of a larger diameter than your factory 12 bolt rear. This isn't the end of the world, but you will need to buy/build new spring plates and U bolts. This is a great way to go. __________________ 72 Chevy CST K5 HIGHLANDER BLAZER Getting a 6.0,NV4500,NP205,14BFF (Currently laying all over the place in little pieces) 72 Chevy swb step-side "LS" 6.0 Here's a build thread of sorts 2002 HD2500 Crew Cab, 8.1L Allison 4x4 Daily Driver Check it out www.lsdyno.com

10-16-2011, 05:32 PM	#4
shocker Registered User Join Date: Dec 2009 Location: edmonton ab Posts: 73	Re: Will 73-87 diffs fit? thanx for the help and info guys! __________________ formerly cooter

10-16-2011, 07:17 PM	#5
SILVER_WS6 Account Suspended Join Date: May 2011 Location: 67-72 HQ Posts: 103	Re: Will 73-87 diffs fit? I actually need to rebuild my 72 rear. Im not sure anymore what it is. I know its stock. Should just need wheel bearings and prob the carrier and pinion. Any ideas or numbers?



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