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01-31-2017, 12:21 PM
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#1 |
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Registered User
Join Date: Jan 2011
Location: CA
Posts: 772
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Can anyone ID this diff?
Im trying to see if this will work in my 61, but the owner isn't sure what it is...
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'61 Panel - Helms Bakery Truck - Daily Driver - FOR SALE |
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01-31-2017, 12:25 PM
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#2 |
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Registered User
 
Join Date: Sep 2006
Location: San Francisco
Posts: 4,782
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Re: Can anyone ID this diff?
How many bolts in the cover and how many lugs dose it have? Looks like something that came out of 60 to 72 chevy truck depending on the Lugs. The pumpkin looks kind of small in that picture, but it could just be the angle.
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"A man and his truck, what a beautiful thing" 65 Short Fleetside BBC 65 Long Fleetside 283 3 on the tree for now. my build thread http://www.67-72chevytrucks.com/vboa...d.php?t=259536 |
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01-31-2017, 12:27 PM
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#3 |
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Registered User
Join Date: Jan 2011
Location: CA
Posts: 772
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Re: Can anyone ID this diff?
Thats what I was thinking too. He is getting a measurement of how wide it is... i will ask about how many bolts on the cover.
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'61 Panel - Helms Bakery Truck - Daily Driver - FOR SALE |
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01-31-2017, 12:31 PM
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#4 |
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Moderator
 Join Date: Dec 2012
Location: ON, Canada
Posts: 2,176
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Re: Can anyone ID this diff?
I have an idea... but just get him to turn it and take a pic of the back. We'll know immediately.
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01-31-2017, 12:56 PM
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#5 |
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Registered User
Join Date: Apr 2004
Location: Tigard, Or
Posts: 503
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Re: Can anyone ID this diff?
Hard to say but it looks like a 10 bolt from an 80s pickup. A shot of the cover will help a bunch but the circled features point me to a 10 bolt.
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01-31-2017, 01:29 PM
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#6 |
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Senior Member
 
Join Date: Jan 2011
Location: Hayes Va
Posts: 4,569
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Re: Can anyone ID this diff?
Looks like one out of a 4wd. Almost looks like it has the bigger brakes on it.
Jimmy
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60 to 66 Chevy and GMC window decals http://67-72chevytrucks.com/vboard/s...d.php?t=661131 Good friends, good food and a hotrod what else do you need? 1966 BBW long fleet Daily driver 1965 BBW short fleet Sold and going to a good home 1965 Suburban 2003 3500 Duramax 2005 Ultra Classic |
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01-31-2017, 01:31 PM
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#7 |
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Registered User
Join Date: Jan 2011
Location: CA
Posts: 772
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Re: Can anyone ID this diff?
Here are some more pics. I have a feeling this is way newer than what Im looking for...
    Also, I found another rear end thats out of a 66 GMC Suburban. The guy that has it says its not a 12 bolt though. What other options did the GMC Suburban have?
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'61 Panel - Helms Bakery Truck - Daily Driver - FOR SALE |
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01-31-2017, 01:39 PM
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#8 |
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Registered User
Join Date: Apr 2004
Location: Tigard, Or
Posts: 503
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Re: Can anyone ID this diff?
That's definitely a 12 bolt
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01-31-2017, 01:42 PM
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#9 |
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Registered User
Join Date: Jan 2011
Location: CA
Posts: 772
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Re: Can anyone ID this diff?
I think it may be from an 80s truck, which would make it too wide for my 61...
Still wondering what the 66 GMC Suburban would have if its not a 12 bolt....
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'61 Panel - Helms Bakery Truck - Daily Driver - FOR SALE |
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01-31-2017, 02:02 PM
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#10 |
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Registered User
Join Date: Feb 2012
Location: pleasant valley--placerville ca
Posts: 3,039
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Re: Can anyone ID this diff?
gmc dana 44
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1961 chevy K10 my build is------------61K10 build |
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01-31-2017, 02:25 PM
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#11 |
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Moderator
Join Date: Aug 2011
Location: China Spring, TX
Posts: 7,280
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Re: Can anyone ID this diff?
That's your basic 12-2 Alpha Delta Charlie right there. Basically.
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Master Chief, US Navy, Retired 1964 C10 Step-side Short Bed - In Progress 2009 2500HD Duramax LTZ 1948 GMC Panel 1956 Big Window Stepside 1953 5 Window Chevy Stepside 1932 Coupe New Seat Foam for Bench Seats? |
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01-31-2017, 03:28 PM
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#12 |
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Registered User
Join Date: Jan 2011
Location: CA
Posts: 772
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Re: Can anyone ID this diff?
What does 12-2 ADC mean?
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'61 Panel - Helms Bakery Truck - Daily Driver - FOR SALE |
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01-31-2017, 03:31 PM
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#13 |
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Moderator
Join Date: Aug 2011
Location: China Spring, TX
Posts: 7,280
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Re: Can anyone ID this diff?
The phrase is "your basic 12-2 Alpha Delta Charlie".
Whatever I want it to mean. In this case, I'm clueless as to what the rear end is. 
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Master Chief, US Navy, Retired 1964 C10 Step-side Short Bed - In Progress 2009 2500HD Duramax LTZ 1948 GMC Panel 1956 Big Window Stepside 1953 5 Window Chevy Stepside 1932 Coupe New Seat Foam for Bench Seats? |
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01-31-2017, 03:34 PM
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#14 |
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Registered User
Join Date: Jan 2011
Location: CA
Posts: 772
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Re: Can anyone ID this diff?
LOL awesome. Ill have to remember that one...
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'61 Panel - Helms Bakery Truck - Daily Driver - FOR SALE |
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01-31-2017, 10:37 PM
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#15 |
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Registered User
Join Date: Jan 2013
Location: Calgary Alberta
Posts: 1,170
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Re: Can anyone ID this diff?
Does the 61 also have leaf springs? Spacing? What about U joint match up?
I have a 1970 (or 71?) 12 bolt in my 66 and like it that it is 1 1/2" wider than original. |
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02-01-2017, 01:40 AM
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#16 |
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60-66 Nut
 Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,252
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Re: Can anyone ID this diff?
That differential IS a truck 12 bolt. It will be 1.5" wider than your original Eaton HO32/33. If it is 6 lug it will have been out of a 4x4.
A GMC will likely have a Dana 44 as already stated. Personally I would stay away from the Dana 44 as the brake drums are basically nonexistant and you have to modify other drums to make them work.
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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 |
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02-01-2017, 01:07 PM
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#17 |
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Registered User
Join Date: Jan 2011
Location: CA
Posts: 772
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Re: Can anyone ID this diff?
Thanks for the replies!!!
I found a local diff shop that will rebuild my stock rear and put 3.90 gears in it for $500. I am debating going this way. A newer 12 bolt would be nice, but between the price of the rear end and the work moving mounts and pan hard, maybe the $500 isn't too bad...
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'61 Panel - Helms Bakery Truck - Daily Driver - FOR SALE |
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02-01-2017, 01:40 PM
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#18 |
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Registered User
Join Date: Feb 2012
Location: pleasant valley--placerville ca
Posts: 3,039
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Re: Can anyone ID this diff?
3.90 gears haven't been made for years. A set of nos ones on e-bay are $495 just for the ring and pinion. Have them put in 3.38"s as they are ave.
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1961 chevy K10 my build is------------61K10 build |
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02-01-2017, 01:43 PM
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#19 |
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Registered User
Join Date: Jan 2011
Location: CA
Posts: 772
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Re: Can anyone ID this diff?
he has 3 sets of 3.90 gears at the shop. He is throwing a set in for free basically with the rebuild. If I want 3.38, then I have to buy a set.
I have a 700r trans, so 3.90 should be fine... Do you guys think I should just rebuild what I have for $500 and not worry about looking for a rear end?
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'61 Panel - Helms Bakery Truck - Daily Driver - FOR SALE |
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02-01-2017, 01:47 PM
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#20 |
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Moderator
Join Date: Aug 2011
Location: China Spring, TX
Posts: 7,280
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Re: Can anyone ID this diff?
Keep your stock rear housing and have it built.
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Master Chief, US Navy, Retired 1964 C10 Step-side Short Bed - In Progress 2009 2500HD Duramax LTZ 1948 GMC Panel 1956 Big Window Stepside 1953 5 Window Chevy Stepside 1932 Coupe New Seat Foam for Bench Seats? |
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02-01-2017, 01:53 PM
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#21 |
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Registered User
Join Date: Jan 2011
Location: CA
Posts: 772
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Re: Can anyone ID this diff?
The biggest downside of the stock rear end is not being able to get a Posi for it. But I guess don't really need one...
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'61 Panel - Helms Bakery Truck - Daily Driver - FOR SALE |
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02-01-2017, 06:27 PM
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#22 |
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Registered User
Join Date: Apr 2004
Location: Tigard, Or
Posts: 503
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Re: Can anyone ID this diff?
I don't know about the earlier stuff but if you already have a 12 bolt, couldn't you swap the axle shafts out from a 65 or 66 to run a posi?
Is it more than a coarse vs fine spline difference on the 61 diffs? |
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02-01-2017, 06:47 PM
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#23 |
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Registered User
Join Date: Jan 2011
Location: CA
Posts: 772
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Re: Can anyone ID this diff?
60-62 were Eaton rear ends. Not 12 bolts. I wish it was that easy....
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'61 Panel - Helms Bakery Truck - Daily Driver - FOR SALE |
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02-01-2017, 07:06 PM
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#24 | |
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Registered User
Join Date: Apr 2004
Location: Tigard, Or
Posts: 503
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Re: Can anyone ID this diff?
Quote:
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02-02-2017, 02:28 PM
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#25 |
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Registered User
Join Date: Feb 2012
Location: pleasant valley--placerville ca
Posts: 3,039
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Re: Can anyone ID this diff?
Go for it at that price. I looked for a set of 3.90 gears with no luck when i did mine. With your trans you should be fine with the 3.90's. these gears new nos?
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1961 chevy K10 my build is------------61K10 build |
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