4x4 running gear questions - The 1947 - Present Chevrolet & GMC Truck Message Board Network

70 Jimmy · 06-03-2002, 04:54 PM

Did the 3/4 ton come with a Dana 44 up front?

Is the 14 bolt the only rear axle that came on a 3/4 ton?

Where can you get gear sets for his 14 bolt rear?

**breeh** · 06-03-2002, 05:50 PM

3/4 ton as well as the 1/2 ton came with 44's up front. These trucks didn't come with the 14 bolt rear. They came with either a Dana 60 or a Corporate/Eaton rear.

70 Jimmy · 06-03-2002, 07:27 PM

I can't seem to find info on the "Corporate/Eaton" Only GM 12 and 14 bolt, and Dana 60. Can anyone point me in the right direction for gears. Thanks

**JIMs70GMC** · 06-03-2002, 08:01 PM

I believe there was a post awhile back about gears for the corporate/eaton rearends that recommended Randy's www.ringpinion.com you'll probably have to call them.

The 14 bolt showed up in 73 and dana60s in the front in 77. 10 bolt fronts showed up in 77 and there was a mix of 10 bolts and dana44s up front until 80

70 Jimmy · 06-03-2002, 08:45 PM

From what I can find out, the Corporate/Eaton is manufacturers name of the 10, 12, and 14 bolt (just guessing that "corporate" refers to GM). The axle I'm refering to is from a friends rig. A 70 chevy 3/4 ton 4x4. It has a 4.11 ratio. He wants to go discs and to a higher ratio, say 3.73s. Of course, cheap and easy is always prefered.

**JIMs70GMC** · 06-03-2002, 09:15 PM

The corporate/eaton rear that would come under 3/4 ton is not like the 10,12,14 bolt rears. This corporate/eaton rear was stopped in 1972 had 10 bolts holding on the rear round cover and had a drop out center section like a 9" rear. Gearing is limited and was in the numerically higher 4:1 range. I believe the highest gearing available was 4.11:1. Though I believe someone said 3:73 are/were made??? not sure. Only locker available was a detroit that I don't think is made anymore. I believe someone posted that Randy's ring and pinion had some(used).

**68SWB4x4** · 06-03-2002, 10:05 PM

just put bigger tires no need for gear change

06-03-2002, 04:54 PM	#1
70 Jimmy aka Crusher, Crushergmc Join Date: Mar 2000 Location: Oregon Posts: 1,834	4x4 running gear questions Did the 3/4 ton come with a Dana 44 up front? Is the 14 bolt the only rear axle that came on a 3/4 ton? Where can you get gear sets for his 14 bolt rear? __________________ "KEEP IT DOWN!" 70 Jimmy 454 2wd 56 GMC Big Window "It's funny till someone gets hurt, then it's freakin' hilarious"

06-03-2002, 05:50 PM	#2
breeh Recovering 67-72 Addict Join Date: Oct 2000 Location: North Bend, WA Posts: 1,788	3/4 ton as well as the 1/2 ton came with 44's up front. These trucks didn't come with the 14 bolt rear. They came with either a Dana 60 or a Corporate/Eaton rear. __________________ 68 Short Fleet 4x4; 427; BTO Level 3 700R4; NP205; Dana 60 front and rear; 4" lift with 35's; Disc brakes; AGR variable ratio steering; factory bucket seats; factory tach and tilt. "Friends call me cruzer cuz I like fast cars and fast women"

06-03-2002, 07:27 PM	#3
70 Jimmy aka Crusher, Crushergmc Join Date: Mar 2000 Location: Oregon Posts: 1,834	I can't seem to find info on the "Corporate/Eaton" Only GM 12 and 14 bolt, and Dana 60. Can anyone point me in the right direction for gears. Thanks __________________ "KEEP IT DOWN!" 70 Jimmy 454 2wd 56 GMC Big Window "It's funny till someone gets hurt, then it's freakin' hilarious"

06-03-2002, 08:01 PM	#4
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	I believe there was a post awhile back about gears for the corporate/eaton rearends that recommended Randy's www.ringpinion.com you'll probably have to call them. The 14 bolt showed up in 73 and dana60s in the front in 77. 10 bolt fronts showed up in 77 and there was a mix of 10 bolts and dana44s up front until 80 __________________ 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 Last edited by JIMs70GMC; 06-03-2002 at 08:04 PM.

06-03-2002, 08:45 PM	#5
70 Jimmy aka Crusher, Crushergmc Join Date: Mar 2000 Location: Oregon Posts: 1,834	From what I can find out, the Corporate/Eaton is manufacturers name of the 10, 12, and 14 bolt (just guessing that "corporate" refers to GM). The axle I'm refering to is from a friends rig. A 70 chevy 3/4 ton 4x4. It has a 4.11 ratio. He wants to go discs and to a higher ratio, say 3.73s. Of course, cheap and easy is always prefered. __________________ "KEEP IT DOWN!" 70 Jimmy 454 2wd 56 GMC Big Window "It's funny till someone gets hurt, then it's freakin' hilarious"

06-03-2002, 09:15 PM	#6
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	The corporate/eaton rear that would come under 3/4 ton is not like the 10,12,14 bolt rears. This corporate/eaton rear was stopped in 1972 had 10 bolts holding on the rear round cover and had a drop out center section like a 9" rear. Gearing is limited and was in the numerically higher 4:1 range. I believe the highest gearing available was 4.11:1. Though I believe someone said 3:73 are/were made??? not sure. Only locker available was a detroit that I don't think is made anymore. I believe someone posted that Randy's ring and pinion had some(used). __________________ 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

06-03-2002, 10:05 PM	#7
68SWB4x4 Strongman Garage Join Date: Apr 2000 Location: Salinas, CA Posts: 10,241	just put bigger tires no need for gear change __________________ Kalle 68 GMC Suburban 1500 4x4 SOLD 69 Pontiac Lemans 99 Silverado 4.8 5 speed ECSB [ Facebook Instagram Subscribe on YOUTUBE



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.