3.90 gears for Eaton H0 axles - The 1947 - Present Chevrolet & GMC Truck Message Board Network

1969 GMC · 11-28-2005, 03:52 AM

I am not getting paid for this, but whenever the discussion about the Eaton comes up, the 3.90 gearsets are mentioned, but usually "they've been discontinued." well, I think they are still being made....

http://www.oldchevytrucks.biz/catalog3/0044.html

part #HP208 (i think, its towards the top of the page)
pricy at $350, but they are brand new.

so I guess this is just an FYI for anyone who thought these aren't made anymore.

Fred T · 11-28-2005, 11:07 AM

Good to see the price coming down, and that they are available again. They were around $600 a few years ago. With that price drop, I would assume they're now being cut overseas.

72MARIO · 11-28-2005, 11:17 AM

I was sure Randys Ring and Pinion had them avaible also.

stueber68 · 11-28-2005, 01:17 PM

It seems that a lot of people are wanting to go with more of a highway gear in the Eatons. I have also heard some people say that 3.90 is as high as they come. Well, I did find a set in a 70 C20 and they happened to be 3.73 and I looked in my GM catalog and they listed a 3.56 to even be available in some of the old Eatons. This may or may not be some helpful info for all of us junkyard rats willing to search around and get some better MPG out of our old pigs.

Rod · 11-28-2005, 01:49 PM

3.73 would interest me, are you going to use them stueber68?

1967k30 · 11-28-2005, 02:14 PM

I just saw on another board where a guy says he has 2 3rd's with 3.55's.I have never seen one and I've looked at dozens.I have seen a few 4.10, lots of 4.56's,and some 5.14's but never a 3.55'. Was there ever a 4.88'? Most say there wasn't but I know a guy that claims to have some.

1969 GMC · 11-28-2005, 05:52 PM

there's an international harvester axle that looks alot like the Eatons, called the RA-15 or something, that has 4.88 gears. maybe its that? they are pretty similar overall.

1969 GMC · 11-28-2005, 05:54 PM

Quote:

Originally Posted by stueber68

It seems that a lot of people are wanting to go with more of a highway gear in the Eatons. I have also heard some people say that 3.90 is as high as they come. Well, I did find a set in a 70 C20 and they happened to be 3.73 and I looked in my GM catalog and they listed a 3.56 to even be available in some of the old Eatons. This may or may not be some helpful info for all of us junkyard rats willing to search around and get some better MPG out of our old pigs.

I was not aware of the higher gears for the Eatons, but a guy off of Pirate4x4 scanned me a page of his '63 TSM and it shows an optional 5.86 gear ratio for the H072. I am guessing that this is another hard to find gearset.

jostrans68 · 11-28-2005, 06:00 PM

i have 4.10 in mine and just got a 3.54 dana 60 coil to put under it if i dont sell it

Robert1970C20rstbukt · 11-28-2005, 06:50 PM

I'm keeping the 4.10 rear in my truck as long as it keeps working, it doesn't do too bad on the highway with 33's.

67-72williso · 11-28-2005, 09:04 PM

3.90 is the best you can get for HO-72. 3.73 and 3.54 were Dana 60 gears.
Later Willis

11-28-2005, 03:52 AM	#1
1969 GMC Registered User Join Date: Feb 2003 Location: The Rubber City Posts: 5,498	3.90 gears for Eaton H0 axles I am not getting paid for this, but whenever the discussion about the Eaton comes up, the 3.90 gearsets are mentioned, but usually "they've been discontinued." well, I think they are still being made.... http://www.oldchevytrucks.biz/catalog3/0044.html part #HP208 (i think, its towards the top of the page) pricy at $350, but they are brand new. so I guess this is just an FYI for anyone who thought these aren't made anymore. __________________ 1969 GMC K2500 1996 Honda Accord 2007 Kawasaki KLR 650

11-28-2005, 11:07 AM	#2
Fred T Cantankerous Geezer Join Date: Aug 2002 Location: Bel Aire, KS Posts: 6,264	Re: 3.90 gears for Eaton H0 axles Good to see the price coming down, and that they are available again. They were around $600 a few years ago. With that price drop, I would assume they're now being cut overseas. __________________ Fred There is no such thing as too much cam...just not enough engine.

11-28-2005, 11:17 AM	#3
72MARIO Registered User Join Date: Nov 2000 Location: Huntsville Ontario Canada Posts: 4,052	Re: 3.90 gears for Eaton H0 axles I was sure Randys Ring and Pinion had them avaible also. __________________ 1968 Suburban numbers matching all original truck now equipped with 6.0/4L80 on Accuair http://67-72chevytrucks.com/vboard/s...d.php?t=625017 1967 C/20 6.0/4L80 Roofing Truck 1990 V2500 Suburban "Plow Truck" 2005 TAHOE DD

11-28-2005, 01:17 PM	#4
stueber68 1968 C20 Vortec Beast Join Date: Jun 2005 Location: STILLWATER,OKLAHOMA Posts: 483	Re: 3.90 gears for Eaton H0 axles It seems that a lot of people are wanting to go with more of a highway gear in the Eatons. I have also heard some people say that 3.90 is as high as they come. Well, I did find a set in a 70 C20 and they happened to be 3.73 and I looked in my GM catalog and they listed a 3.56 to even be available in some of the old Eatons. This may or may not be some helpful info for all of us junkyard rats willing to search around and get some better MPG out of our old pigs. __________________ Ugly or not it still kicks a**!

11-28-2005, 01:49 PM	#5
Rod Join Date: Dec 1999 Location: Eastern - Manitoba Canada, Winnipeg Posts: 4,369	Re: 3.90 gears for Eaton H0 axles 3.73 would interest me, are you going to use them stueber68? __________________ Senior active founding member. 70 3/4 ton GMC Suburban 4x4 250/4 spd. 71 1/2 ton Suburban Chevy 4x4, 350/350 72 Chev 1 ton tow truck 402BB w/Holmes 440 wrecker on propane 2005 FLSTSCI Harley Springer 85 FXSB Harley Lowrider 72 Triumph 650 Bonneville 5spd "Poor people don't have hobbies" Quote from wife.

11-28-2005, 02:14 PM	#6
1967k30 Senior Member Join Date: Sep 2005 Location: NE Posts: 363	Re: 3.90 gears for Eaton H0 axles I just saw on another board where a guy says he has 2 3rd's with 3.55's.I have never seen one and I've looked at dozens.I have seen a few 4.10, lots of 4.56's,and some 5.14's but never a 3.55'. Was there ever a 4.88'? Most say there wasn't but I know a guy that claims to have some. __________________ 01 2500 Duramax,6spd,4x4,Not stock. Estimated 550rwhp/1100rwfp on fuel only. 03 3500 Duramax,6spd,4x4,Pac-Brake,not stock Estimated 500rwhp/1000rwfp fuel only 67 K10 in many pieces Little Brothers truck 67 K20 Cummins 12V/NV4500/205, D60/Eaton w/ Detroit,37" Xterrains,crossover steering, Future plans,Twins and lots of fuel.

11-28-2005, 05:52 PM	#7
1969 GMC Registered User Join Date: Feb 2003 Location: The Rubber City Posts: 5,498	Re: 3.90 gears for Eaton H0 axles there's an international harvester axle that looks alot like the Eatons, called the RA-15 or something, that has 4.88 gears. maybe its that? they are pretty similar overall. __________________ 1969 GMC K2500 1996 Honda Accord 2007 Kawasaki KLR 650

11-28-2005, 06:00 PM	#9
jostrans68 Jostrans68 Join Date: Mar 2001 Location: Bloomington indiana Posts: 1,182	Re: 3.90 gears for Eaton H0 axles i have 4.10 in mine and just got a 3.54 dana 60 coil to put under it if i dont sell it __________________ [CGTW Member former 67-72 now with a 96 silverado

11-28-2005, 06:50 PM	#10
Robert1970C20rstbukt Registered User Join Date: Jun 2004 Location: Beeville, Texas Posts: 1,943	Re: 3.90 gears for Eaton H0 axles I'm keeping the 4.10 rear in my truck as long as it keeps working, it doesn't do too bad on the highway with 33's. __________________ RJD 1984 Chevrolet C30 welding truck 454/SM465 1977 GMC C15 pickup 350/TH350 1970 Chevrolet C20 pickup 350/TH400 1970 Chevrolet K20 Suburban 454/TH350 1969 GMC 8500 478M V6/5 spd winch truck

11-28-2005, 09:04 PM	#11
67-72williso Junk/Daily Driver Club Join Date: Feb 2004 Location: Manheim, PA 17545 Posts: 253	Re: 3.90 gears for Eaton H0 axles 3.90 is the best you can get for HO-72. 3.73 and 3.54 were Dana 60 gears. Later Willis __________________ Daily Driver: 1970 C-20 400 sbc,sm-465,Dana 61 one ton SRW rear, 3.07 gears, locker. There are three kinds of people: those who make things happen, those who watch things happen, and those who have no idea what happened!

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