installing posi carrier - The 1947 - Present Chevrolet & GMC Truck Message Board Network

walker · 06-10-2009, 10:12 AM

I have a 67 with a 4.11 posi rear and have wanted higher gears for a while. I found a 3.73 open diff, but would like to keep my posi. How difficult is it to swap in my posi carrier into the open diff. I have had people tell me that they just swapped the carriers using the shims that were on the carrier they were swappin in. What are the chances of doing that? I could also swap the gears into my existing rear axle onto my posi carrier if there is a better chance of success. Let me know if anyone has done this swap.
Thanks

BossHogg69 · 06-10-2009, 10:22 AM

Well, my experience with trying to set up my own rearend ended up in me taking it to a shop to get rid of the howling noise! I even had the contact pattern right (or so I thought) and checked the backlash, etc.. I've witnessed said shop swap carriers on their own shop truck (going from open to posi) and had to use a different shim pack. Basically, with changing the gears onto your carrier and existing housing, everything will need to be set up from square 1. Crush sleeve, shims, etc. Are you gonna reuse any bearings? I would say you would be extremely lucky if it just happened to go back together and not make noise.

walker · 06-10-2009, 11:36 PM

Thanks, that was what I needed to know. I think I may just swap in the 3.73 open diffy, then when I have the time to play with it move the other spare 3.73 gears into my original rear end.

06-10-2009, 10:12 AM	#1
walker Registered User Join Date: Jul 2003 Location: north of Phx AZ about 30 miles Posts: 698	installing posi carrier I have a 67 with a 4.11 posi rear and have wanted higher gears for a while. I found a 3.73 open diff, but would like to keep my posi. How difficult is it to swap in my posi carrier into the open diff. I have had people tell me that they just swapped the carriers using the shims that were on the carrier they were swappin in. What are the chances of doing that? I could also swap the gears into my existing rear axle onto my posi carrier if there is a better chance of success. Let me know if anyone has done this swap. Thanks __________________ Andy,Phx AZ '67 C-10 (Ahhh, done at last. Well there is that disk front end I want to put in and...) "23 C-Cab-sold '48 Ford 8N tractor(still working) '67 Scout(Now on the road) '70 MG B.-sold

06-10-2009, 10:22 AM	#2
BossHogg69 motor exploder Join Date: Mar 2009 Location: Pittsburgh, PA Posts: 2,346	Re: installing posi carrier Well, my experience with trying to set up my own rearend ended up in me taking it to a shop to get rid of the howling noise! I even had the contact pattern right (or so I thought) and checked the backlash, etc.. I've witnessed said shop swap carriers on their own shop truck (going from open to posi) and had to use a different shim pack. Basically, with changing the gears onto your carrier and existing housing, everything will need to be set up from square 1. Crush sleeve, shims, etc. Are you gonna reuse any bearings? I would say you would be extremely lucky if it just happened to go back together and not make noise. __________________ Adam 1969 Chevy CST/10 stepside, DART Big M/TREMEC Magnum Extreme/3.73's w/Detroit Truetrac 1965 Chevy Bel Air Wagon (daily driver), 327/TH350,10 bolt w/3.08's 1961 Chevy Bel Air Sport Coupe, ZZ454/M21/9" rear w/3.50's & Detroit Truetrac 2005 GMC 1500 ccsb 2wd, 6.0L/4L65e/3.73 G80 2006 GMC 2500HD ccsb 4x4, DMax LBZ/Allison 6spd/4.56's w/Detroit TrueTrac Use the SEARCH function on this forum - it is your friend!!

06-10-2009, 11:36 PM	#3
walker Registered User Join Date: Jul 2003 Location: north of Phx AZ about 30 miles Posts: 698	Re: installing posi carrier Thanks, that was what I needed to know. I think I may just swap in the 3.73 open diffy, then when I have the time to play with it move the other spare 3.73 gears into my original rear end. __________________ Andy,Phx AZ '67 C-10 (Ahhh, done at last. Well there is that disk front end I want to put in and...) "23 C-Cab-sold '48 Ford 8N tractor(still working) '67 Scout(Now on the road) '70 MG B.-sold

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