apache rear end - The 1947 - Present Chevrolet & GMC Truck Message Board Network

61apachespeed · 02-10-2011, 12:32 AM

i have a 61 apache. trying to find out what rear end i have. the center bolts on from the front but it has a cover on the rear. i want to change the gears out i have 411.

**Captainfab** · 02-10-2011, 12:38 AM

The only designation I have found for that style of rear end is the GM55T. They were used from 1955-62. Gears aren't that easy to find for those rear ends. The only gears I know of are 3.38's made by Yukon Gear. What you currently have would be 3.90's

If I were you I would consider changing that rear end out for a truck 12 bolt. There are lots of options for those.

pope · 02-10-2011, 12:04 PM

I thought that I might add to the above in case you have a 3/4 or 1 ton. If so the 3/4 ton trucks usually had H052 axles with 4.57 gears and the 1 tons had H070 axles with 5.13 or something close to that. These were built by Eaton, Chevy used these While GMC seemed to use Spicer (later Dana) the 4.10 gears were available later in the 60s and 3.90 gears were available as aftermarket sets, which are no longer made. (or that I have been able to find new)

pope · 02-10-2011, 12:05 PM

I forgot to ask what kind of ratio are you after?

61apachespeed · 02-10-2011, 08:40 PM

i want all 340s. right now i can only do about 60 tops on the free way. i want to be able to keep up. i think its a 1/2 ton. i have springs in the rear. how can you tell ??

61apachespeed · 02-10-2011, 08:51 PM

can i even do a 12 bolt. i was thinking nothing bolted up. i starting to think it might be cheaper to buy a 700r4

**Captainfab** · 02-11-2011, 01:25 AM

Yes a 12 bolt will work. That's what I mentioned in my first post

Quote:

Originally Posted by 61apachespeed

can i even do a 12 bolt. i was thinking nothing bolted up. i starting to think it might be cheaper to buy a 700r4

Is your truck a 4x4? A 1/2 ton will have 6 wheel studs. A 3/4 ton has 8 wheel studs.

Quote:

Originally Posted by 61apachespeed

i want all 340s. right now i can only do about 60 tops on the free way. i want to be able to keep up. i think its a 1/2 ton. i have springs in the rear. how can you tell ??

61apachespeed · 02-11-2011, 02:18 AM

no its two wheel drive. i am pretty sure its 1/2 ton. it has a 327 and a t350 in it. with the stock rear end. so what would the 12 bolt come out of???

02-10-2011, 12:32 AM	#1
61apachespeed Registered User Join Date: Jul 2010 Location: phoenix az Posts: 60	apache rear end i have a 61 apache. trying to find out what rear end i have. the center bolts on from the front but it has a cover on the rear. i want to change the gears out i have 411.

02-10-2011, 12:38 AM	#2
Captainfab 60-66 Nut Join Date: Mar 2007 Location: Coeur d'Alene, Idaho Posts: 23,252	Re: apache rear end The only designation I have found for that style of rear end is the GM55T. They were used from 1955-62. Gears aren't that easy to find for those rear ends. The only gears I know of are 3.38's made by Yukon Gear. What you currently have would be 3.90's If I were you I would consider changing that rear end out for a truck 12 bolt. There are lots of options for those. __________________ 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

02-10-2011, 12:04 PM	#3
pope Registered User Join Date: Dec 2010 Location: Belgrade, Mt Posts: 130	Re: apache rear end I thought that I might add to the above in case you have a 3/4 or 1 ton. If so the 3/4 ton trucks usually had H052 axles with 4.57 gears and the 1 tons had H070 axles with 5.13 or something close to that. These were built by Eaton, Chevy used these While GMC seemed to use Spicer (later Dana) the 4.10 gears were available later in the 60s and 3.90 gears were available as aftermarket sets, which are no longer made. (or that I have been able to find new) __________________ Where the hell did my coffee cup go?!! Last edited by pope; 02-10-2011 at 12:12 PM.

02-10-2011, 12:05 PM	#4
pope Registered User Join Date: Dec 2010 Location: Belgrade, Mt Posts: 130	Re: apache rear end I forgot to ask what kind of ratio are you after? __________________ Where the hell did my coffee cup go?!!

02-10-2011, 08:40 PM	#5
61apachespeed Registered User Join Date: Jul 2010 Location: phoenix az Posts: 60	Re: apache rear end i want all 340s. right now i can only do about 60 tops on the free way. i want to be able to keep up. i think its a 1/2 ton. i have springs in the rear. how can you tell ??

02-10-2011, 08:51 PM	#6
61apachespeed Registered User Join Date: Jul 2010 Location: phoenix az Posts: 60	Re: apache rear end can i even do a 12 bolt. i was thinking nothing bolted up. i starting to think it might be cheaper to buy a 700r4

02-11-2011, 02:18 AM	#8
61apachespeed Registered User Join Date: Jul 2010 Location: phoenix az Posts: 60	Re: apache rear end no its two wheel drive. i am pretty sure its 1/2 ton. it has a 327 and a t350 in it. with the stock rear end. so what would the 12 bolt come out of???



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