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post #1 of 12 (permalink) Old 03-13-2012, 08:05 PM Thread Starter
 
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Rear axle codes

Ok as some of you may or may not know I have a 69 Custom S, it's been through a few lives prior to my acquiring it. I decided to check the the rear axle today for the codes to check and see what I had back there.

Near as I can tell from the VIN decoding she came with a V8 (one of the less than 100,000 units V8's - if that means anything)

It had a non original 389 and TH 400 when I got it so I don't expect it to be original but this is what I found.

The only codes on the front of the passenger side of the axle are
P2 WC in that order.
I can't find a date stamp, nothing before the P2 and nothing after the WC.

Am I looking in the wrong spot?

It's a 10 bolt differential and it has drums.
I did not find the Safe T Track tag.

All I can find looking for the WC code that makes sense is 1969 Tempest 2.78 39/14 WC XC
Any help would be great.
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post #2 of 12 (permalink) Old 03-13-2012, 08:11 PM
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Check by the cover. It should be cast not stamped. If it was a safe t track the code would have started with an x, y or z for '68 - '72. y or z for '65 - '67.



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post #3 of 12 (permalink) Old 03-13-2012, 09:14 PM Thread Starter
 
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only thing I can find CAST on the case is 9799100 with F100 above it.
That's on the rear of the passengers side of differential.
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post #4 of 12 (permalink) Old 03-13-2012, 10:09 PM
 
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Check rear axle numbers here ... GTO Axle Identification
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post #5 of 12 (permalink) Old 03-13-2012, 10:21 PM
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Quote:
Originally Posted by Pontiacpurebrred View Post
only thing I can find CAST on the case is 9799100 with F100 above it.
That's on the rear of the passengers side of differential.
The F100 should be the date code - June 10, 1970

I've read where all 10 bolt 1970 GTO/Lemans had that axle code, 9799100.

At any rate, it's a '70 rearend and still a WC 2.78(providing the gears haven't been changed). Real nice highway gear especially with todays gas prices... That's what I have except a '71. The 3.55 safe t track is going to have to wait....



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Accel Super Coil, Accel 8.8mm Wires

Last edited by 68greengoat; 03-13-2012 at 10:52 PM.
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post #6 of 12 (permalink) Old 03-14-2012, 11:30 AM Thread Starter
 
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Well alrighty then. I have a 1970 non-limited slip highway gear rear end.
(I did the old school test, spun one wheel and the other wheel goes the opposite direction)

Which I do not want. (shocking right?) (It's drum breaks too)

The gears aren't bad I suppose (like you said gas prices right?)

But I gotta have both wheels locked down. What are my options on either making this a posi or finding a replacement?
I know any 68-72 GTO, LeMans, Tempest limited slip will work, anything else out there that I can find at a junk yard or on CL that will go with minor to no modification?
Thanks in advance.
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post #7 of 12 (permalink) Old 03-14-2012, 02:37 PM
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LOL, I have drums all the way around too...

If you want to stick with the same gears, just swap out the carrier to a limited slip like this:

Auburn Gear 5420114 Auburn Gear Differentials



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Performer Intake, Mild Cam
Pertronix Ignitor III
Accel Super Coil, Accel 8.8mm Wires
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Quote:
Originally Posted by 68greengoat View Post
LOL, I have drums all the way around too...

If you want to stick with the same gears, just swap out the carrier to a limited slip like this:

Auburn Gear 5420114 Auburn Gear Differentials
I at least have discs up front, and power all around. I looked at those, the Auburn gears, wasn't sure how it would work and if I am capable of installing such a thing. I will look into it further and also may look around for a replacement.
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post #9 of 12 (permalink) Old 03-14-2012, 05:06 PM
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Power, what's that? For me it's my leg and arms. Manual everything, power nothing... Power................. someday.....



SOLD.....
462ci, 4spd
Performer Intake, Mild Cam
Pertronix Ignitor III
Accel Super Coil, Accel 8.8mm Wires
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post #10 of 12 (permalink) Old 03-14-2012, 05:54 PM Thread Starter
 
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I got SUPER lucky with Marilyn, she came with power breaks (discs in front) tilt column, power antennae, remote mirror, no rust in the trunk or floor boards. Someday she will be back together and hopefully with 4 wheel discs, upgraded suspension and POSI.
lol

Thanks for all the info.
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  Pontiac GTO Forum > The 1964-1974 Pontiac Tempest, Lemans & GTO > 1964-1974 Tempest, Lemans & GTO Undercarriage, Frame, Transmission and Differential Discussions.

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