will a posi out of a 67 1/2 ton fit in a 71-72 1/2 ton - The 1947 - Present Chevrolet & GMC Truck Message Board Network

teeitup · 06-11-2011, 09:05 AM

Will he need the axles too, or any other problems he may have? Thanks for any help, Randy

LONGHAIR · 06-11-2011, 09:40 AM

The differential itself will swap as long as they are both of the same "series" There are different units for the variation of gear ratios.
The axles are a different story though. There is a length issue. The newer axles are longer than the early ones, so that's a no-go.

This is not a simple bolt-in procedure though, you really need a pro to do this kind of installation. You can turn your parts into scrap quickly...

cdowns · 06-11-2011, 11:27 AM

i would not think it is worth the effort to swap in a 40 year old posi

gcburdic · 06-12-2011, 02:24 PM

Randy....as Longhair mentioned, my understanding is that the carrier will swap in, but they need to grab the pinion gear too (ring and pinion gear should stay together), obviously like cdowns says, someone should look both gears over really good too, and replace/ rebuild if possible

might as well replace all bearings and seals while they are there too....

teeitup · 06-13-2011, 12:56 PM

Thanks guys for info, ring gear and pinion is all with it. Randy

teeitup · 06-26-2011, 11:39 PM

Here ya go Travis

*truckmanloco* · 06-26-2011, 11:44 PM

Thanks Randy thats what i needed.

06-11-2011, 09:05 AM	#1
teeitup Just like to part out trucks!! Join Date: Nov 2001 Location: Meriden, Ks-North of Topeka 10 miles Posts: 27,396	will a posi out of a 67 1/2 ton fit in a 71-72 1/2 ton Will he need the axles too, or any other problems he may have? Thanks for any help, Randy __________________ 67 Chev swb stepside 4x4 283 4 speed SOLD 72 blazer 4x4 4 speed Cheyenne 72 GMC swb 4x4 fleet 4 speed, original paint 1958 Cameo (one of 1405 built, it was my dads) 2020 chevy Apex 4x4 crew cab 1969 Z28 with the 302 1980 chevy swb 4x4 1964 chevell Malibu SS 1976 K20, sold new originally out of my dads chevy dealership Members that I've met, over 200 probably closer to 300 in the 12 years I've been on this site, everyone I met "It was a pleasure" Last edited by teeitup; 06-11-2011 at 09:05 AM.

06-11-2011, 11:27 AM	#3
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: will a posi out of a 67 1/2 ton fit in a 71-72 1/2 ton i would not think it is worth the effort to swap in a 40 year old posi __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

06-12-2011, 02:24 PM	#4
gcburdic Restoration Virgin! Join Date: Jan 2008 Location: Huntersville, NC Posts: 8,298	Re: will a posi out of a 67 1/2 ton fit in a 71-72 1/2 ton Randy....as Longhair mentioned, my understanding is that the carrier will swap in, but they need to grab the pinion gear too (ring and pinion gear should stay together), obviously like cdowns says, someone should look both gears over really good too, and replace/ rebuild if possible might as well replace all bearings and seals while they are there too.... __________________ Geoff with a G 1968 Chevy C10 SWB The Mistress 1972 Custom Deluxe C20 Suburban A Suburban Named Isabella 1966 Ford Mustang Mama's High School Graduation Present

06-13-2011, 12:56 PM	#5
teeitup Just like to part out trucks!! Join Date: Nov 2001 Location: Meriden, Ks-North of Topeka 10 miles Posts: 27,396	Re: will a posi out of a 67 1/2 ton fit in a 71-72 1/2 ton Thanks guys for info, ring gear and pinion is all with it. Randy __________________ 67 Chev swb stepside 4x4 283 4 speed SOLD 72 blazer 4x4 4 speed Cheyenne 72 GMC swb 4x4 fleet 4 speed, original paint 1958 Cameo (one of 1405 built, it was my dads) 2020 chevy Apex 4x4 crew cab 1969 Z28 with the 302 1980 chevy swb 4x4 1964 chevell Malibu SS 1976 K20, sold new originally out of my dads chevy dealership Members that I've met, over 200 probably closer to 300 in the 12 years I've been on this site, everyone I met "It was a pleasure"

06-26-2011, 11:39 PM	#6
teeitup Just like to part out trucks!! Join Date: Nov 2001 Location: Meriden, Ks-North of Topeka 10 miles Posts: 27,396	Re: will a posi out of a 67 1/2 ton fit in a 71-72 1/2 ton Here ya go Travis __________________ 67 Chev swb stepside 4x4 283 4 speed SOLD 72 blazer 4x4 4 speed Cheyenne 72 GMC swb 4x4 fleet 4 speed, original paint 1958 Cameo (one of 1405 built, it was my dads) 2020 chevy Apex 4x4 crew cab 1969 Z28 with the 302 1980 chevy swb 4x4 1964 chevell Malibu SS 1976 K20, sold new originally out of my dads chevy dealership Members that I've met, over 200 probably closer to 300 in the 12 years I've been on this site, everyone I met "It was a pleasure"

06-26-2011, 11:44 PM	#7
truckmanloco Account Suspended Join Date: Nov 2007 Location: San Diego ca Posts: 717	Re: will a posi out of a 67 1/2 ton fit in a 71-72 1/2 ton Thanks Randy thats what i needed.



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