front and rear differential questions - The 1947 - Present Chevrolet & GMC Truck Message Board Network

CG · 06-07-2005, 01:22 AM

on a 68 3/4 ton 4x4 if you want to go to front disks what year 3/4 ton 4x4 front end would be a bolt in? and would the lug pattern be the same? also does the front and rear have to have same gear ratio...like both 4:11's etc.? seems like this would be a simple swap...maybe?

**JIMs70GMC** · 06-07-2005, 06:04 AM

Any front from 71 and up will bolt in. You'll need to replace brake lines from the frame to the caliper. Lug pattern the same, 8 on 6.5". You want them as close as possible i.e 4.09s and 4.10s or 4.56s and 4.57s, not 4.10 and 4.56s something will break.

CG · 06-07-2005, 12:03 PM

thanks for the info...i know around the country prices vary for this kind of thing but does anyone have a ballpark figure so if i decide to go looking i will have a general idea for the cost of a front assembly

**JIMs70GMC** · 06-07-2005, 02:58 PM

For 1/2 and 3/4 ton stuff $100-400 depending on condition etc... 1 ton (dana60) $800 and up.

b454rat · 06-10-2005, 08:26 PM

I bolted in a Dana 44HD in my 62 burban and besides brake lines the only thing that was different was the axle shock tabs. The original 62 tabs had a different angle to them. Now that I think about it, the spring plates were different on one side. For the most part it's bolt in, not major fabbing needed. Any axle up to 1991 will bolt in. For a Dana axle, 77 and older in the 1/2 and 3/4 tons, 77 thru 91 for a Dana 60, but watch the price. I've sold 5 or 6 Dana 60s, the cheapest being $500 and the most for $1100.

06-07-2005, 01:22 AM	#1
CG BlahBlahBlah Join Date: Feb 2002 Location: Wa. Posts: 20,073	front and rear differential questions on a 68 3/4 ton 4x4 if you want to go to front disks what year 3/4 ton 4x4 front end would be a bolt in? and would the lug pattern be the same? also does the front and rear have to have same gear ratio...like both 4:11's etc.? seems like this would be a simple swap...maybe?

06-07-2005, 06:04 AM	#2
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	Any front from 71 and up will bolt in. You'll need to replace brake lines from the frame to the caliper. Lug pattern the same, 8 on 6.5". You want them as close as possible i.e 4.09s and 4.10s or 4.56s and 4.57s, not 4.10 and 4.56s something will break. __________________ 1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm

06-07-2005, 12:03 PM	#3
CG BlahBlahBlah Join Date: Feb 2002 Location: Wa. Posts: 20,073	thanks for the info...i know around the country prices vary for this kind of thing but does anyone have a ballpark figure so if i decide to go looking i will have a general idea for the cost of a front assembly Last edited by CG; 06-07-2005 at 12:16 PM.

06-07-2005, 02:58 PM	#4
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	For 1/2 and 3/4 ton stuff $100-400 depending on condition etc... 1 ton (dana60) $800 and up. __________________ 1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm

06-10-2005, 08:26 PM	#5
b454rat Senior Member Join Date: May 2004 Location: Binghamton, NY Posts: 3,469	I bolted in a Dana 44HD in my 62 burban and besides brake lines the only thing that was different was the axle shock tabs. The original 62 tabs had a different angle to them. Now that I think about it, the spring plates were different on one side. For the most part it's bolt in, not major fabbing needed. Any axle up to 1991 will bolt in. For a Dana axle, 77 and older in the 1/2 and 3/4 tons, 77 thru 91 for a Dana 60, but watch the price. I've sold 5 or 6 Dana 60s, the cheapest being $500 and the most for $1100. __________________ 2000 GMC CCSB 454/4L80 6” lift SAS 1999 Chevy CCSB 454/NV4500 4” SAS 1999 GMC Yukon 350/4L60 6" SAS



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