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Is there a proctologist in the house?

Bill Hanlon

Bill Hanlon

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I need your help in identifying the rear end of my recently purchased '52 GMC 150.

As a fresh from tech school Airman 2nd class working on B-52 auto pilots in 1966, my trainer Bob Schwenke used to tell me I couldn't find my ass with both hands, a flashlight and a mirror. This morning I gathered the necessary tools including a genuine USAF wireless solar powered communications device ...

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... and my camera. Crawled under the '52 and found this.
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Flange to flange is about 54.5"
There is a "B 1 7" date code at about 11 o'clock on the back side of the center section.
3" diameter axle tubes, necking down to about 2.5" at the flange.
There are no signs of any pads being cut off of the axle tubes.
10 bolts on the round rear cover.
No adjuster holes in the backing plates.

Looking from the front you can see this on the passenger's side top rib.
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Picture has been flipped for easy reading. I think the number is 3894859.

The driver's side top rib has a "GM 14" casting mark.

Bolt circle of the hubs is 5x4.75"

Using the chalk mark on the tire and driveshaft, the ratio is somewhere in the 3.5:1 range.

Do you know what vehicle this rear end originated in?
 
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Rear end

Appears to could be a 1967-69 Camaro 10 bolt, but it would be 60" wide backing plate to backing plate.

It could also be from a 65-67 Nova, they are 57.75" wide backing plate to backing plate.

Date Code B 1 7 = (B)=Feb. (1)=day (7)most likely 1967

Go here http://www.camaros.org/drivetrain.shtml and look at the information on rear ends. Try to find the rest of the numbers and compare them to what's listed then you should know what you really have.


Good Luck,

Rick
 
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Hunted all over the rear end for the numbers referenced from the Camaro site with no luck. The axle has newly welded on shock brackets that may cover the numbers. The Previous Owner (not a do-it-yourselfer) gave me the invoices from the company that did the work. One invoice lists a "10 bolt ring and pinion set" from Jeg's for $319.78, but didn't mention the ratio.
 
I'd say the B 1 7 code proves it's 1967 vintage rear.

Double check your width dimension. Your width appears to be closer to a Nova than a Camaro.

Lastly, pull the rear end cover and get a count of the teeth on the ring gear.

Not much more you can do.

Good Luck,

Rick
 
Well, if you were following the procedures you had back in the AF, you probably should have let go of your ass to get a good measurement? I'm sure the mirror was only reflecting your smile~
Glad I could help with this.
Carry on.
 
Bill,
First, congrats on the new ride, seems to have a lot of possibilities especially for someone with time on their hands. Here is a chart I have used a lot during the years. The standard measurement and most often given is the wheel mount flange (or axle face) to the same on the other side. Backing plates can very due to different amounts of off set where they fit back over the axle tube end so it's not the preferred measurement. The flange to flange will be the same even if you throw the drums away and go to discs. The first generation Camaro/Firebird was nearly identical to the AD at about 60-61" and with a 4.75 bolt circle it's a good bet. Remember on the chart you can subsitute Camaro and Firebird. http://www.teufert.net/other/rear20%end dimensions.htm
 
Mechanical Puzzles

Now you're about to learn how us old Farm / Junkyard Mechanics manged to get parts when working on cobbled up things......

Bendix brakes , right ? that'll ease things a fair bit .

The R & P ratio will be stamped into the edge of the Crown Wheel .

I'm betting 3.52 .

I still have my old WWII Rescue Signal Mirror , it's not fancy-schmancy like yours but was still loads of fun for both me as a lad and my young son when faced with high beam tailgaters late at night........ :) .
 
vwnate1 said:
I still have my old WWII Rescue Signal Mirror , it's not fancy-schmancy like yours but was still loads of fun for both me as a lad and my young son when faced with high beam tailgaters late at night........ :) .
Click to expand...
But in today's world you have to assume the high beam tailgater is carrying and is stupid enough to use it.
 
that sir would be an 8.2 10 bolt rear:

specs:
8.20" Diameter Ring Gear
1.438" Diameter Pinion - 25 Splines


65-70 Chevrolet
64-72 Chevelle
64-70 Chevy II
67-70 Camaro
70-72 Nova

Most Chevy-style 8.2" 10-bolts use the 11" cover with an inverted "V" groove (for internal lubrication) across it's face, just like the 12-bolt version. Some have a 10 5/8" irregular cover. All have slip-in axles retained by C-clips. The pinion nut will be 1 1/8".

info came from http://www.oldsmobility.com/old/10bolt-tech.htm

had to identify a 8.5 10 bolt that i put under my truck had to search all this stuff out as well, glad i had it bookmarked

hope that helps.
 
Saftey first !

Bill Hanlon said:
But in today's world you have to assume the high beam tailgater is carrying and is stupid enough to use it.
Click to expand...

Just so Sir ;

This is why I stopped using it this way over a decade ago.....

Too many goofballs out there these days .
 
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