Rearend Decode? [Archive] - Chevelle Tech

: Rearend Decode?


stealth71
Feb 23rd, 07, 8:58 PM
I know it's a 12-bolt, but not sure from what.

Looks like the housing is #3968038
http://www.bionicengineering.net/media/DSC02385.JPG

Axle tube: TEL -0526K- Left axle Tube
http://www.bionicengineering.net/media/axle_tube.jpg

Realhummer
Feb 23rd, 07, 9:37 PM
I know one thing, the number of the casing is 3959038, it may appear as 3958038 but it is not and this would be a 1969 housing. go to www.chevellestuff.com then click "decoding" then rear and you can scroll down and see what I am stating. The TEI does not show as anything but the 0526K means the date stamped likely was 05=may 26 =26th and K =Mc kinnon plant. I am not a expert on these things so please do not take my word 100% , you may want to check it yourself or have one of the more knowledgable Guys on this forum check it out for you. GOOD LUCK --- BOB

Realhummer
Feb 23rd, 07, 9:46 PM
I got my numbers a little confused here , YOU SAID IT LOOKS LIKE 3968038 and I meant to state that a 69 rear is 3959038 --- I stand corrected, Got myself a little twisted up on that ! BOB

rcrchsr16
Feb 23rd, 07, 11:04 PM
I'm not sure what you mean by left axle tube, but if you mean driver's side, that's not where my 12 bolt is marked. My 12 bolt decoded "CI" from a 66-68 Chevelle. It is marked on the passenger side axle tube, on the driveshaft/pinion side of the tube. Mine was pretty difficult to see, as the stamping was no where near as deep a stamping as the one pictured here. I had to use a 220 girt sandpaper , then wash it with thinner to find the marks. It was early on after I bought this 72 parts car, and before I popped the cover. Pleasant surprise- decoded as a 3:73 gear with posi-traction- verified later after opening it up. Very happy to put it in my 71!

mr
Feb 23rd, 07, 11:33 PM
I know it's a 12-bolt, but not sure from what.

Looks like the housing is #3968038
http://www.bionicengineering.net/media/DSC02385.JPG

Axle tube: TEL -0526K- Left axle Tube
Here are the casting numbers I have personally observed over the decades:

12-Bolt Housing: Casting #
1965 Chevelle 3859140N
1966 Chevelle 3875745N
1967 Chevelle 3894939NF
1967 Chevelle-Late 3917124NF
1968-Early 69 Chevelle 3917124NF
1969 Chevelle 3959038NF
1970-72 Chevelle 3969278NF

10-Bolt Housing: Casting #
1964 Chevelle 3839390N
1965 Chevelle 3959139N
1966 Chevelle 3875744N
1967 Chevelle 3894938NF
1968 Chevelle 3917123NF
1969 Chevelle 3859037NF
1970-72 Chevelle 3969277NF
"Chevrolet by the numbers 1965-69", does'nt list any "code", anywhere close, to the [Axle tube code: TEL 0526 K].... Don.

shooter
Feb 24th, 07, 12:28 AM
This is another one of the chevelle 12bolts used in the Canadian built
Cutlass 442 starting in 68 at Oshawa plant.
TL=In 69: Olds. 3.55 posi, the off set E is for Eaton posi source.

stealth71
Feb 24th, 07, 1:06 AM
This is another one of the chevelle 12bolts used in the Canadian built
Cutlass 442 starting in 68 at Oshawa plant.
TL=In 69: Olds. 3.55 posi, the off set E is for Eaton posi source.

This rear was originaly from a different car and this confirms it. You sure know your stuff. Thanks for the quick responses.