Eaton/Corp rear axle ID??? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

HotRod929 · 01-23-2003, 12:58 PM

How do I know if I have one of these? Can you tell by just looking at it? I can get some pics of the axle if someone knows by just looking. Thanks

HotRod

**Yukon Jack** · 01-23-2003, 01:10 PM

Here's what my eaton in my 69 K20 looks like.

HotRod929 · 01-23-2003, 01:26 PM

Thanks Yukon Jack. What are the pros and cons of the Eaton axles?

HotRod

**Yukon Jack** · 01-23-2003, 01:30 PM

The drop out center section is cool, they are very strong, you can eat a salad out of the rear diff cover, they are old so limited parts, not sure if there is an easy disk brake swap. Mine has a factory Detroit Locker called a No-Spin in it and what a difference that makes - it will go places in 2wd that my 4wd Yukon can't go.

crew70 · 01-23-2003, 02:14 PM

i love these eatons, there big and manly .HD all the way.

stelth2002 · 01-23-2003, 02:34 PM

What gears are available for those eatons. Is there anything in the 3 range? Also where can u find gears for it? Is there a posi available for it? Thanks

**Yukon Jack** · 01-23-2003, 02:54 PM

Give Randy Ring and Pinion a call, I think they have a website. I don' know on the gears if there is anything in the 3 range but I think they go up to 5.3 something.

HotRod929 · 01-23-2003, 03:14 PM

Yea I think mine are 4.57s. Are these worth anything to sell because I would like to get a 10 bolt or something? Anyone know what the website for that place Yukon mentioned..."Randy Ring and Pinion."Thanks

HotRod

**Yukon Jack** · 01-23-2003, 03:25 PM

Better find someone local, shipping would be a bear.

www.ring-pinion.com

Vince M · 01-23-2003, 06:49 PM

Ring and pinion are available in 3.90, 4.10, 4.56. The 3.90 is an aftermarket and is the lowest numerically available. Other parts such as spiders are not available new. The pinion bearing is very expensive. The axles are 17 spline and in my opinion is the weakest part of the rear.
I swapped mine out and put in a 14 bolt FF.

stelth2002 · 01-23-2003, 06:52 PM

Ok then, i already researched the HO72. And found that the lowest is a 3.9 ratio. What is the same width as a 72 3/4 ton dana 44. Can i find a stock 14 bolt FF that width? Also what are some low 3 ratio gears that are the same in both the 14 bolt and dana 44

Vince M · 01-23-2003, 06:59 PM

The width of the 14 bolt is about an 1.5" wider if I remember. The shock mounts and the spring perches have to be relocated. I did these myself if you have a good grinder w/cutoff wheel and a welder.
Common ratios are the 3.73 which is probably in the 14 bolt already. Others are something down in the 3.2"s. I went to a couple of web sites and just checked what was available for each. I kind of was shooting for 3.54 but later I found it wasn't available for the Dana 44. So I've got 3.73.

HotRod929 · 01-23-2003, 08:11 PM

Good news guys I believe I have a Dana 60. Check out the pic below. So is it still possible for me to have 4.56 gears with the Dana 60? Thanks

HotRod

stelth2002 · 01-23-2003, 09:09 PM

Looks like a 12 bolt corp to me. I believe those gears are possible in those.

**JIMs70GMC** · 01-24-2003, 06:35 AM

The 12 bolt would be semi-floater his is a full floater. I believe that the only thing that comes close in width to the front dana 44 from a 3/4 ton is a 14 bolt from under a chevy van. GM had the two different widths so in a turn the front end would track closer to the front end turning radius i.e through the front foot print.

01-23-2003, 12:58 PM	#1
HotRod929 Registered User Join Date: Mar 2002 Location: Bondurant, IA but in Worcester, MA for school Posts: 767	Eaton/Corp rear axle ID??? How do I know if I have one of these? Can you tell by just looking at it? I can get some pics of the axle if someone knows by just looking. Thanks HotRod __________________ 1970 Chevy C-20 350 V-8 Turbo 350 w/ shift kit Dana 60 w/ 4.10 gears AND Powr-Loc POSI New Additions: Summit Headers 135amp alternator Proform HEI Edelbrock 1406 600cfm carb Sunpro Tach Powr-Loc POSI Edelbrock Performer RPM Intake MSD 6A Ignition Box AIM: HotRod929 Visit My Site: http://1970chevy.netfirms.com/

01-23-2003, 01:10 PM	#2
Yukon Jack Post Whore Join Date: Feb 2000 Location: Rose Hill, KS, USA Posts: 12,686	Here's what my eaton in my 69 K20 looks like. __________________ 1970 Blazer with a 400 sbc and 4" lift 1980 Pontiac Trans Am, 455 Oldsmobile 2012 Kawasaki Concours 14

01-23-2003, 01:26 PM	#3
HotRod929 Registered User Join Date: Mar 2002 Location: Bondurant, IA but in Worcester, MA for school Posts: 767	Thanks Yukon Jack. What are the pros and cons of the Eaton axles? HotRod __________________ 1970 Chevy C-20 350 V-8 Turbo 350 w/ shift kit Dana 60 w/ 4.10 gears AND Powr-Loc POSI New Additions: Summit Headers 135amp alternator Proform HEI Edelbrock 1406 600cfm carb Sunpro Tach Powr-Loc POSI Edelbrock Performer RPM Intake MSD 6A Ignition Box AIM: HotRod929 Visit My Site: http://1970chevy.netfirms.com/

01-23-2003, 01:30 PM	#4
Yukon Jack Post Whore Join Date: Feb 2000 Location: Rose Hill, KS, USA Posts: 12,686	The drop out center section is cool, they are very strong, you can eat a salad out of the rear diff cover, they are old so limited parts, not sure if there is an easy disk brake swap. Mine has a factory Detroit Locker called a No-Spin in it and what a difference that makes - it will go places in 2wd that my 4wd Yukon can't go. __________________ 1970 Blazer with a 400 sbc and 4" lift 1980 Pontiac Trans Am, 455 Oldsmobile 2012 Kawasaki Concours 14

01-23-2003, 02:14 PM	#5
crew70 Registered User Join Date: Jan 2002 Location: shafer,mn,usa Posts: 316	i love these eatons, there big and manly .HD all the way. __________________ 70 chevy 3/4 ton 4x4 402ci crewcab 3/4ton 94 gmc 1 ton dually crewcab 454ci 99 suburban 5.7 2001 500cc ski-doo mxz 95 500cc ski doo fan 650 bombardiar 4 wheeler

01-23-2003, 02:34 PM	#6
stelth2002 Young Gun wth Fast Inline Join Date: Jan 2002 Location: Idaho Posts: 1,475	What gears are available for those eatons. Is there anything in the 3 range? Also where can u find gears for it? Is there a posi available for it? Thanks __________________ 1967 Chevrolet LWB with built 292! 415 ft. lbs of torque, 4 speed :O with 27% overdrive too, 3.73 Posi. Frame and body done... getting painted!!!

01-23-2003, 02:54 PM	#7
Yukon Jack Post Whore Join Date: Feb 2000 Location: Rose Hill, KS, USA Posts: 12,686	Give Randy Ring and Pinion a call, I think they have a website. I don' know on the gears if there is anything in the 3 range but I think they go up to 5.3 something. __________________ 1970 Blazer with a 400 sbc and 4" lift 1980 Pontiac Trans Am, 455 Oldsmobile 2012 Kawasaki Concours 14

01-23-2003, 03:14 PM	#8
HotRod929 Registered User Join Date: Mar 2002 Location: Bondurant, IA but in Worcester, MA for school Posts: 767	Yea I think mine are 4.57s. Are these worth anything to sell because I would like to get a 10 bolt or something? Anyone know what the website for that place Yukon mentioned..."Randy Ring and Pinion."Thanks HotRod __________________ 1970 Chevy C-20 350 V-8 Turbo 350 w/ shift kit Dana 60 w/ 4.10 gears AND Powr-Loc POSI New Additions: Summit Headers 135amp alternator Proform HEI Edelbrock 1406 600cfm carb Sunpro Tach Powr-Loc POSI Edelbrock Performer RPM Intake MSD 6A Ignition Box AIM: HotRod929 Visit My Site: http://1970chevy.netfirms.com/

01-23-2003, 03:25 PM	#9
Yukon Jack Post Whore Join Date: Feb 2000 Location: Rose Hill, KS, USA Posts: 12,686	Better find someone local, shipping would be a bear. www.ring-pinion.com __________________ 1970 Blazer with a 400 sbc and 4" lift 1980 Pontiac Trans Am, 455 Oldsmobile 2012 Kawasaki Concours 14

01-23-2003, 06:49 PM	#10
Vince M Senior Member Join Date: Apr 2000 Location: Orlando, FL Posts: 1,076	Ring and pinion are available in 3.90, 4.10, 4.56. The 3.90 is an aftermarket and is the lowest numerically available. Other parts such as spiders are not available new. The pinion bearing is very expensive. The axles are 17 spline and in my opinion is the weakest part of the rear. I swapped mine out and put in a 14 bolt FF. __________________ ............................................................ 68 Chevy CST SWB w/LS1, carb & 700r4. Golden Anniversary clone with a few improvements.

01-23-2003, 06:52 PM	#11
stelth2002 Young Gun wth Fast Inline Join Date: Jan 2002 Location: Idaho Posts: 1,475	Ok then, i already researched the HO72. And found that the lowest is a 3.9 ratio. What is the same width as a 72 3/4 ton dana 44. Can i find a stock 14 bolt FF that width? Also what are some low 3 ratio gears that are the same in both the 14 bolt and dana 44 __________________ 1967 Chevrolet LWB with built 292! 415 ft. lbs of torque, 4 speed :O with 27% overdrive too, 3.73 Posi. Frame and body done... getting painted!!!

01-23-2003, 06:59 PM	#12
Vince M Senior Member Join Date: Apr 2000 Location: Orlando, FL Posts: 1,076	The width of the 14 bolt is about an 1.5" wider if I remember. The shock mounts and the spring perches have to be relocated. I did these myself if you have a good grinder w/cutoff wheel and a welder. Common ratios are the 3.73 which is probably in the 14 bolt already. Others are something down in the 3.2"s. I went to a couple of web sites and just checked what was available for each. I kind of was shooting for 3.54 but later I found it wasn't available for the Dana 44. So I've got 3.73. __________________ ............................................................ 68 Chevy CST SWB w/LS1, carb & 700r4. Golden Anniversary clone with a few improvements.

01-23-2003, 08:11 PM	#13
HotRod929 Registered User Join Date: Mar 2002 Location: Bondurant, IA but in Worcester, MA for school Posts: 767	Good news guys I believe I have a Dana 60. Check out the pic below. So is it still possible for me to have 4.56 gears with the Dana 60? Thanks HotRod Attached Images __________________ 1970 Chevy C-20 350 V-8 Turbo 350 w/ shift kit Dana 60 w/ 4.10 gears AND Powr-Loc POSI New Additions: Summit Headers 135amp alternator Proform HEI Edelbrock 1406 600cfm carb Sunpro Tach Powr-Loc POSI Edelbrock Performer RPM Intake MSD 6A Ignition Box AIM: HotRod929 Visit My Site: http://1970chevy.netfirms.com/

01-23-2003, 09:09 PM	#14
stelth2002 Young Gun wth Fast Inline Join Date: Jan 2002 Location: Idaho Posts: 1,475	Looks like a 12 bolt corp to me. I believe those gears are possible in those. __________________ 1967 Chevrolet LWB with built 292! 415 ft. lbs of torque, 4 speed :O with 27% overdrive too, 3.73 Posi. Frame and body done... getting painted!!!

01-24-2003, 06:35 AM	#15
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	The 12 bolt would be semi-floater his is a full floater. I believe that the only thing that comes close in width to the front dana 44 from a 3/4 ton is a 14 bolt from under a chevy van. GM had the two different widths so in a turn the front end would track closer to the front end turning radius i.e through the front foot print. __________________ 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



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