Help Identifying rear end pumpkin - The 1947 - Present Chevrolet & GMC Truck Message Board Network

jbgroby · 10-19-2010, 06:56 PM

My friend Justin has a '60 chevy 1/2 ton and recently changed the I-6 to a 302 V-8. He would like to change the rearend gears from the stock 3.90 (he believes) to something better 3.07 or 3.23 IF he has the Dana 44.

He sent me these pictures but this pumpkin does not look like the Dana 44 I have with my 60 gmc.

Can any of you more knowledgable folks figure out what his pumpkin is so we can pick a set of gears?

Thanks
Jake

292farmer · 10-19-2010, 07:07 PM

looks like an eaton rear end best your gonna get probably is 4.11 i thought. maybe other ratios were available

jbgroby · 10-19-2010, 09:39 PM

This rearend came wih the truck, did a bit of reasarch and it hard to find a decent picture or gear breakdown. I tried Precisiongear.com and they don't list any eaton. From what I've found they seem to be popular with fords?

He has the gears for 3.90 right now, so he trying to do what I did by gear lower so he drive a little easier at highway speeds.

Now that we know what it is called, we hope to find something out, (stupid questions time) was eaton a popular rearend for the '60 model chevy's?

Any help you can through on this would be great.
Thanks
Jake

292farmer · 10-19-2010, 10:07 PM

i believe on this website if u look at the section "from 1966 dealer book" you will see H-024 and H-29 i believe those would be the eatons for the half tons. the 3/4 and 1 tons are H-052 H-072 and H-110 so im guessing the H designates the eatons. i know thats for 66 but those axles i believe changes very little over the years(may explain why 3.90 not listed for 66).
http://www.6066gmcguy.org/DriveAxle.htm
im hoping this starts you in right direction, and that i haven't steered u in wrong direction. im hoping someone else will chime in.

also found this looks just like your and in same year 55-62 HO33 http://www.pirate4x4.com/forum/showt...=771317&page=9
HO33 Gear ratios
3.38
3.70
3.90*yours
4.11

9.375 inch ring gear
Posi available form 60 to 64
C clip axles, thats why the rear cover is removable.
hope this helps

jbgroby · 10-19-2010, 11:18 PM

thanks

**Captainfab** · 10-20-2010, 12:31 AM

Yukon Gear makes 3.38 gears for those. They refer to them as a 55T differential. Those differentials were used from 1955 thru 1962, and 3.90 was probably the most common gear.

jbgroby · 10-20-2010, 07:58 AM

Thanks Cap, Now we know what were looking for.

Jake

Shaky · 10-21-2010, 05:56 PM

Yeah - that one's not an Eaton. The "Eaton" has two bolts close together at the 9 o'clock and 3 o'clock.

10-19-2010, 06:56 PM	#1
jbgroby Registered User Join Date: Nov 2008 Location: Lacombe, LA Posts: 2,772	Help Identifying rear end pumpkin My friend Justin has a '60 chevy 1/2 ton and recently changed the I-6 to a 302 V-8. He would like to change the rearend gears from the stock 3.90 (he believes) to something better 3.07 or 3.23 IF he has the Dana 44. He sent me these pictures but this pumpkin does not look like the Dana 44 I have with my 60 gmc. Can any of you more knowledgable folks figure out what his pumpkin is so we can pick a set of gears? Thanks Jake Attached Images __________________ http://s1299.photobucket.com/user/jb...23904108567829

10-19-2010, 07:07 PM	#2
292farmer Registered User Join Date: Nov 2009 Location: stoddard nh Posts: 693	Re: Help Identifying rear end pumpkin looks like an eaton rear end best your gonna get probably is 4.11 i thought. maybe other ratios were available __________________ 1972 gmc c25 292/sm465 dana 60 w/5.13s 1973 vw super beetle 1600cc/4spd(baja bug) 1974 chevy c60 351v6/np-540+2 speed eaton rear 2005 chevy cobalt 2.2l

10-19-2010, 09:39 PM	#3
jbgroby Registered User Join Date: Nov 2008 Location: Lacombe, LA Posts: 2,772	Re: Help Identifying rear end pumpkin This rearend came wih the truck, did a bit of reasarch and it hard to find a decent picture or gear breakdown. I tried Precisiongear.com and they don't list any eaton. From what I've found they seem to be popular with fords? He has the gears for 3.90 right now, so he trying to do what I did by gear lower so he drive a little easier at highway speeds. Now that we know what it is called, we hope to find something out, (stupid questions time) was eaton a popular rearend for the '60 model chevy's? Any help you can through on this would be great. Thanks Jake __________________ http://s1299.photobucket.com/user/jb...23904108567829

10-19-2010, 10:07 PM	#4
292farmer Registered User Join Date: Nov 2009 Location: stoddard nh Posts: 693	Re: Help Identifying rear end pumpkin i believe on this website if u look at the section "from 1966 dealer book" you will see H-024 and H-29 i believe those would be the eatons for the half tons. the 3/4 and 1 tons are H-052 H-072 and H-110 so im guessing the H designates the eatons. i know thats for 66 but those axles i believe changes very little over the years(may explain why 3.90 not listed for 66). http://www.6066gmcguy.org/DriveAxle.htm im hoping this starts you in right direction, and that i haven't steered u in wrong direction. im hoping someone else will chime in. also found this looks just like your and in same year 55-62 HO33 http://www.pirate4x4.com/forum/showt...=771317&page=9 HO33 Gear ratios 3.38 3.70 3.90yours 4.11 9.375 inch ring gear Posi available form 60 to 64 C clip axles, thats why the rear cover is removable. hope this helps __________________ 1972 gmc c25 292/sm465 dana 60 w/5.13s 1973 vw super beetle 1600cc/4spd(baja bug) 1974 chevy c60 351v6/np-540+2 speed eaton rear 2005 chevy cobalt 2.2l Last edited by 292farmer; 10-19-2010 at 10:08 PM.*

10-19-2010, 11:18 PM	#5
jbgroby Registered User Join Date: Nov 2008 Location: Lacombe, LA Posts: 2,772	Re: Help Identifying rear end pumpkin thanks __________________ http://s1299.photobucket.com/user/jb...23904108567829

10-20-2010, 12:31 AM	#6
Captainfab 60-66 Nut Join Date: Mar 2007 Location: Coeur d'Alene, Idaho Posts: 23,247	Re: Help Identifying rear end pumpkin Yukon Gear makes 3.38 gears for those. They refer to them as a 55T differential. Those differentials were used from 1955 thru 1962, and 3.90 was probably the most common gear. __________________ Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE Last edited by Captainfab; 10-20-2010 at 12:31 AM.

10-20-2010, 07:58 AM	#7
jbgroby Registered User Join Date: Nov 2008 Location: Lacombe, LA Posts: 2,772	Re: Help Identifying rear end pumpkin Thanks Cap, Now we know what were looking for. Jake __________________ http://s1299.photobucket.com/user/jb...23904108567829

10-21-2010, 05:56 PM	#8
Shaky Six in a row makes it go... Join Date: Mar 2009 Location: Vacationland: Maine Posts: 1,346	Re: Help Identifying rear end pumpkin Yeah - that one's not an Eaton. The "Eaton" has two bolts close together at the 9 o'clock and 3 o'clock. Attached Images __________________ 67 C20 long step resto: http://67-72chevytrucks.com/vboard/s...d.php?t=342086 66 C10 long step build: http://67-72chevytrucks.com/vboard/s...=1#post3814790 CT to Alaska in a 67 C10: http://67-72chevytrucks.com/vboard/s...d.php?t=399224 “The height of sophistication is simplicity." - Clare Boothe Luce



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