10 bolt in 77 3/4? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

milner · 05-28-2007, 12:26 PM

I have a 72 K20 with the original corprate rear. I found a 77 K20 with a 14 bolt that I am going to swap in. The owner says the truck has a 10 bolt with 8-lugs. Does this sound right? I have not seen the truck yet. I was going to just buy both axles but mine has a Dana 44 in it. Should I just leave the 44? The truck is not a rock crawler or something that I beat on, just wondering if it is true there is a 10 bolt w/8-lugs and if I should just leave my 44 in. Thanks.

Don

eedgell · 05-28-2007, 12:35 PM

Yes, 10 bolt front w/8 lug would be a corp. front. And yes I would leave the dana in place. The two are mostley the same except for the carrier, but I would stick with the dana because it is already bolted in. No benefit in changing dana out. Plus the dana is correct equipment for your 72. Just my thoughts.

msgross · 05-28-2007, 12:54 PM

unless the gears in the 14bolt are different than your current dana... then keep the same gears (10 bolt) or pay someone a few bills to swap yours to match the 14bolt etc...

snj8198 · 05-28-2007, 12:55 PM

Quote:

Originally Posted by eedgell

Yes, 10 bolt front w/8 lug would be a corp. front. And yes I would leave the dana in place. The two are mostley the same except for the carrier, but I would stick with the dana because it is already bolted in. No benefit in changing dana out. Plus the dana is correct equipment for your 72. Just my thoughts.

I agree, strength wise the Dana 44 and Corporate 10 bolt are the same, so there is no reason to swap one for the other except if the Dana's houseing is bent. Although there are lots of aftermarket components for each axle, the Dana 44 does have a few more options in the selectible locker catagory if you choose to ever go such a route. -steve

milner · 05-28-2007, 01:15 PM

Thanks for the replies. The 14 bolt and the dana have the same gear ratio but snj8198's post made me remember the dana I have now is from a buddy who had it in his mid 80s burb with 44inch boggers and went over a car when the throttle stuck. Not sure if it is bent, maybe I should just get the 10 bolt also?

Chris27 · 05-28-2007, 02:15 PM

IIRC '77 is kind of hit & miss for 10 bolts. '77 was a transition year, some got D44's some got 10 bolts. My diffs came from a '77 and the front was D44. Double check what you are getting.

eedgell · 05-28-2007, 03:06 PM

It sure doesnt hurt to have parts!! Better to have it and not need it than the other way, I always say.

05-28-2007, 12:26 PM	#1
milner Registered User Join Date: Jun 2003 Location: Mandan,ND Posts: 268	10 bolt in 77 3/4? I have a 72 K20 with the original corprate rear. I found a 77 K20 with a 14 bolt that I am going to swap in. The owner says the truck has a 10 bolt with 8-lugs. Does this sound right? I have not seen the truck yet. I was going to just buy both axles but mine has a Dana 44 in it. Should I just leave the 44? The truck is not a rock crawler or something that I beat on, just wondering if it is true there is a 10 bolt w/8-lugs and if I should just leave my 44 in. Thanks. Don __________________ 355,vortec heads, Doug Herbert cam, Performer intake, 750 Holley, Hooker Comps, 2 1/2 duals w/Aero Chambers, 2500 stall and 3.73 posi.

05-28-2007, 12:35 PM	#2
eedgell It's the air up here Join Date: Mar 2007 Location: Western Colorado Posts: 710	Re: 10 bolt in 77 3/4? Yes, 10 bolt front w/8 lug would be a corp. front. And yes I would leave the dana in place. The two are mostley the same except for the carrier, but I would stick with the dana because it is already bolted in. No benefit in changing dana out. Plus the dana is correct equipment for your 72. Just my thoughts. __________________ 1971 cheyenne k10 4 speed np 205 454 BB factory a/c Never drink down stream of the herd! Eric

05-28-2007, 12:54 PM	#3
msgross Registered User Join Date: Jul 2006 Location: Central PA Posts: 12,201	Re: 10 bolt in 77 3/4? unless the gears in the 14bolt are different than your current dana... then keep the same gears (10 bolt) or pay someone a few bills to swap yours to match the 14bolt etc... __________________ The Garage: 1968 K-10 SWB - "Project Money Pit" 1996 Z-71 - "huntin rig" 1969 C-10 LWB (SOLD) "Project flip that truck or else" 1993 Passport, F@rd 1-ton (SOLD)"Project Cousin Eddie" My Garage Build "The 1,000 footer" Last edited by msgross; 05-28-2007 at 12:54 PM.

05-28-2007, 01:15 PM	#5
milner Registered User Join Date: Jun 2003 Location: Mandan,ND Posts: 268	Re: 10 bolt in 77 3/4? Thanks for the replies. The 14 bolt and the dana have the same gear ratio but snj8198's post made me remember the dana I have now is from a buddy who had it in his mid 80s burb with 44inch boggers and went over a car when the throttle stuck. Not sure if it is bent, maybe I should just get the 10 bolt also? __________________ 355,vortec heads, Doug Herbert cam, Performer intake, 750 Holley, Hooker Comps, 2 1/2 duals w/Aero Chambers, 2500 stall and 3.73 posi.

05-28-2007, 02:15 PM	#6
Chris27 Blazerless Join Date: Nov 2006 Location: Kelowna, BC, Canada Posts: 274	Re: 10 bolt in 77 3/4? IIRC '77 is kind of hit & miss for 10 bolts. '77 was a transition year, some got D44's some got 10 bolts. My diffs came from a '77 and the front was D44. Double check what you are getting. __________________ 72' K5 Blazer 4x4 350TBI/700R4/NP205 3/4 ton diffs. Daily driver. SOLD 69' Beaumont 388/700R4 11.70@116 77' Bronco, Wife's mall cruiser/poser 4x4. Capable but too pretty to go offroad.

05-28-2007, 03:06 PM	#7
eedgell It's the air up here Join Date: Mar 2007 Location: Western Colorado Posts: 710	Re: 10 bolt in 77 3/4? It sure doesnt hurt to have parts!! Better to have it and not need it than the other way, I always say. __________________ 1971 cheyenne k10 4 speed np 205 454 BB factory a/c Never drink down stream of the herd! Eric Last edited by eedgell; 05-28-2007 at 03:07 PM.



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