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#1 |
Registered User
Join Date: Sep 2005
Location: Smith Mountain Lake Virginia
Posts: 1,537
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rear diff identification help (I tried...)
I've spent several hours now trying to find anything about the gear ratio on the net (and in here) to id my differential - I've attached a diagram of what I have and what I've found so far.... In the near future, I will be pulling the cover, looking at the gears, changing the fluid, etc. but would like to know so I can start looking for what I want if this isn't it.... I know it's all original. Thank you all for the assistance.
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"A cat will almost always blink when hit between the eyes with a ball peen hammer" (you don't always have to state the obvious) Wear your PPE! You can eat with false teeth but you can't see with a false eye. 1959 Studebaker Silverhawk 350/400 1972 C10 L6 3OTT 2005 F350 - Built - whew! Last edited by Luvlegs; 09-19-2006 at 08:42 AM. |
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#2 |
Registered User
Join Date: Jan 2002
Location: cornville, maine
Posts: 659
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Re: rear diff identification help (I tried...)
The rear ends are normally identified visually, such as 10 or 12 bolt, or the bigger dana 60's, HO 52 and HO 72. Since you have a half ton, it is either a 10 or 12 bolt. I believe a 10 bolt has a round rear cover, and a 12 bolt has a not round shaped cover.
A photo would make ID a snap.
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jku Cornville, Maine 68 C10 burb 42 Willys MB 46 Dodge WF-32 1.5 ton 53 & 56 Olds' 60 Cadillac 22 Dodge Brothers |
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#3 |
Registered User
Join Date: Sep 2005
Location: Smith Mountain Lake Virginia
Posts: 1,537
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Re: rear diff identification help (I tried...)
Sorry - it's a 12 bolt, I was looking for the gear ratio - thanks
__________________
"A cat will almost always blink when hit between the eyes with a ball peen hammer" (you don't always have to state the obvious) Wear your PPE! You can eat with false teeth but you can't see with a false eye. 1959 Studebaker Silverhawk 350/400 1972 C10 L6 3OTT 2005 F350 - Built - whew! |
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#4 |
Registered User
Join Date: Jan 2002
Location: cornville, maine
Posts: 659
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Re: rear diff identification help (I tried...)
Two places to find gear ratio are the glovebox door sticker, or pop the cover and rear the stamping on the ring gear.
The other way to determine is to jack up the rear end, and put a mark on the driveshaft, turn the wheel exactly one turn, and count the number of turns the drive shaft makes. If its just under four, its a 3.73(the standard rear gears), if slightly more, its a 4.11. There is a slim chance its a 3.07, but with a 6 cylinder, its most likely a 3.73.
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jku Cornville, Maine 68 C10 burb 42 Willys MB 46 Dodge WF-32 1.5 ton 53 & 56 Olds' 60 Cadillac 22 Dodge Brothers |
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#5 |
Registered User
Join Date: Sep 2005
Location: Smith Mountain Lake Virginia
Posts: 1,537
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Re: rear diff identification help (I tried...)
ok - got all that - (nothing on my glove box sticker) what I'm trying to do is verify with the numbers stamped on the axle.-
I found a bunch of sites that decipher all the numbers but most were for chevelles or camaros, etc. - no trucks. Most only went up to 1970....and there was one that showed "RH" as a posi rear end (?).... but with only a 6 in it originally, I didn't think that sounded right. From all the posts I've looked at, Solver seemed to be the guy with the breaks downs of the RPOs(?)...
__________________
"A cat will almost always blink when hit between the eyes with a ball peen hammer" (you don't always have to state the obvious) Wear your PPE! You can eat with false teeth but you can't see with a false eye. 1959 Studebaker Silverhawk 350/400 1972 C10 L6 3OTT 2005 F350 - Built - whew! Last edited by Luvlegs; 09-19-2006 at 09:25 AM. |
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#6 |
Member #1049
Join Date: Jun 2000
Location: Troy Montana
Posts: 3,940
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Re: rear diff identification help (I tried...)
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#7 |
Registered User
Join Date: Sep 2005
Location: Smith Mountain Lake Virginia
Posts: 1,537
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Re: rear diff identification help (I tried...)
Thanks man - now all I need to do is figure out if it's posi or not -
What I'd really like to do is find a place for a break down of all the stampings -I know as it shows in my sketch, it was produced Oct 21, 1971... on the day shift.... kind of interesting to know - Thanks jku and livrat!
__________________
"A cat will almost always blink when hit between the eyes with a ball peen hammer" (you don't always have to state the obvious) Wear your PPE! You can eat with false teeth but you can't see with a false eye. 1959 Studebaker Silverhawk 350/400 1972 C10 L6 3OTT 2005 F350 - Built - whew! |
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#8 |
Cantankerous Geezer
Join Date: Aug 2002
Location: Bel Aire, KS
Posts: 6,264
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Re: rear diff identification help (I tried...)
To check for posi, jack both rear wheels and turn the right wheel. If the left wheel turns the same direction, you have posi. Also, don't trust the markings for the gear ratio. Someone before you could have swapped out the gears. Verify either by turning the wheels and counting the revs or popping the cover and looing for the ratio (or counting the gear teeth)
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Fred There is no such thing as too much cam...just not enough engine. ![]() |
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#9 |
Registered User
Join Date: Sep 2005
Location: Smith Mountain Lake Virginia
Posts: 1,537
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Re: rear diff identification help (I tried...)
gotcha again....on the wheel spinning and popping the cover, etc. - (I know the trucks all original - I know both POs)
Let's say I was doing a completely authentic restoration and wanted to make all the stuff match up and get all the stampings information - any idea of online sources for info? Guess I could try a dealer....
__________________
"A cat will almost always blink when hit between the eyes with a ball peen hammer" (you don't always have to state the obvious) Wear your PPE! You can eat with false teeth but you can't see with a false eye. 1959 Studebaker Silverhawk 350/400 1972 C10 L6 3OTT 2005 F350 - Built - whew! |
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#10 |
Registered User
Join Date: Dec 2004
Location: Northern AZ
Posts: 7,271
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Re: rear diff identification help (I tried...)
Fred, I know you know your stuff, but I have a posi in my camaro and my tahoe and the wheels spin in oposite directions cause they are limited slip and they only engage when one begins to loose traction. As for wondering what the gear ratio is or if it is a posi, just take the cover off. That is the only way you will know for sure, and the best we can do is speculate, if you want to know, then pull the cover and be done with it.
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#11 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: rear diff identification help (I tried...)
well if you know it is original, and the glove box sticker says nothing about posi, limited slip or something to that effect, then it isn't.
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#12 |
Registered User
Join Date: May 2000
Location: Storm Lake, Ia
Posts: 1,449
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Re: rear diff identification help (I tried...)
rhc is listed as: CS-CE 10, PS-PE 10 with 3:73 ratio no posi
rhx is 3:73 with Posi
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#13 |
Registered User
Join Date: Sep 2005
Location: Smith Mountain Lake Virginia
Posts: 1,537
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Re: rear diff identification help (I tried...)
Thanks to all.
__________________
"A cat will almost always blink when hit between the eyes with a ball peen hammer" (you don't always have to state the obvious) Wear your PPE! You can eat with false teeth but you can't see with a false eye. 1959 Studebaker Silverhawk 350/400 1972 C10 L6 3OTT 2005 F350 - Built - whew! |
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