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  Topic Review (Newest First)
08-08-2019 09:41 AM
sz0k30
Quote:
Originally Posted by Big Dave View Post
BBC cars had a TH400 and a 3/8th inch gas line. In 1967 a SBC had a 5/16th inch gas line and a PG

Not quite. 327's also came with a TH400.
07-05-2019 07:34 PM
67ImpalaSSConv Cowl tag indicates this was a th400 car for sure, very early build St. Louis car. . I know It does have an original 3/8 fuel line because I had to replace part of it when I replaced the fuel sending unit and cleaned the tank. But it didnít have the original engine or tranny so I couldnít be completely sure what it was. No build sheet either, was pretty much stripped down when I got it. I replaced most of the front end parts and bought new springs while I was at it. It also has original rear air shocks, I havenít replaced anything in the rear yet. Anyway, the car has been fun and mostly a mystery as to what it actually began life as..
07-05-2019 12:55 PM
Big Dave BBC cars had a TH400 and a 3/8th inch gas line. In 1967 a SBC had a 5/16th inch gas line and a PG (TH350 wasn't released as a production tranny until 1969). If you have a radiator still in the car the BBC had a 3 core and the SBC was a 2 core. Springs and shocks were also different but you would have to measure the spring wire size and free height to verify.

Yes a combo 3R-1330 will work. Just buy a couple to have spares for the future; as these unique car parts are not going to be made much longer as those who appreciate classic cars age out.

Big Dave
07-05-2019 10:28 AM
67ImpalaSSConv It was a highly optioned vehicle. Ac, th400 and several other options I forget. It might also have been a big block car I think from several other clues weíve found. But thereís no way to be sure about engine size. U less you know some definitive clues

So now that Iím sure what yoke I have, is it ok to use a combo yoke with the 3r style drive shaft I found at the salvage? It is about a 3Ē shaft. I happened to find one the exact length I needed so it might not need cut and messed with.

Also wondering about the 3.07 gears. It seems a little high but Will that be ok with the big block and th400.
07-04-2019 07:50 PM
Big Dave You might have gotten a portly Impala. U-joints were based on the GVW on the vehicle and the Impala and the half ton pick up shared a lot of parts due to their weight.

Big Dave
07-04-2019 06:51 PM
67ImpalaSSConv Well I verified it is definitely a pass car 12 bolt by the shape of the diff cover. And it appears to have never been changed so I suspect it is stock. Also it is a 1330 style because it measures 3 5/8" between the tabs. Little bit of a mystery now. I'm wondering if someone didn't change the yoke to match another shaft or if some of the cars didn't use a 1330 style??
07-03-2019 03:36 PM
67ImpalaSSConv
Quote:
Originally Posted by Big Dave View Post
Use a caliper. You can buy a cheap Chinese six inch digital caliper for $20:

https://www.amazon.com/OEMTOOLS-2536...a-749480060607

Tape measures are for carpentry as they are only accurate to an eighth of an inch if you use the tab on the end.

Big Dave
Thanks! I understand. I do a lot of carpentry but do have a nice caliper, but was trying to hurry up under there. was getting claustrophobic!

I'm wondering if its possible that someone did swap the rear end in this car with a truck, or more likely swapped out the rear end yoke with the truck they took the th400 tranny out of so the drive shaft would fit up. Unfortunately, the drive shaft didn't pass with the car when I got it so I'll never know for sure.

Working in my dad's shop on the car, where he wants to install a 2 post lift. That will come in very handy. I actually had the car up on stands wire brushing and power washing the undercarriage prepping for paint, I offered to go in with him on a 2 post lift after that experience..

This is also the same shop where I "restored" my 65 SS about 30 years ago. Restore is a very strong word in that case.. Great experience though.
07-03-2019 03:09 PM
Big Dave Use a caliper. You can buy a cheap Chinese six inch digital caliper for $20:

https://www.amazon.com/OEMTOOLS-2536...a-749480060607

Tape measures are for carpentry as they are only accurate to an eighth of an inch if you use the tab on the end.

Big Dave
07-03-2019 01:42 PM
67ImpalaSSConv
Quote:
Originally Posted by Big Dave View Post
Same yoke is used in open and posi. Styles changed as power increased with time. U-bolts were replaced with straps on newer rears. Tabs were dropped to cut costs in favor of using inside snap rings. 1310 was used on cars. 1330 on trucks up to 10,000 GVW when the 1350 was used. 1450 and larger went on larger (heavier GVW) trucks. You can buy a replacement chrome-moly steel yoke to replace the cast iron one.

https://www.dennysdriveshaft.com/c57_chevy_12_bolt.html

Has all three yokes for a 12 bolt and how to identify them. I learned that they used the 3R universal on a 12 bolt as well. I thought they only were used on the AWW 10 bolt corporate axle.

Big Dave
Makes sense, thanks! This driveshaft guy was probably not extremely knowledgeable about my particular era of Impala. Maybe he was guessing based on trucks and what he had more experience with. This is why I want to make sure I know exactly what I have before they go to welding it up.

I know I don't have the 3r because I do have tabs on my yoke.

so its either a 1310 or 1330, it does use straps to hold on the ujoint. Seems like a simple measurement will tell.
07-03-2019 01:01 PM
Big Dave Same yoke is used in open and posi. Styles changed as power increased with time. U-bolts were replaced with straps on newer rears. Tabs were dropped to cut costs in favor of using inside snap rings. 1310 was used on cars. 1330 on trucks up to 10,000 GVW when the 1350 was used. 1450 and larger went on larger (heavier GVW) trucks. You can buy a replacement chrome-moly steel yoke to replace the cast iron one.

https://www.dennysdriveshaft.com/c57_chevy_12_bolt.html

Has all three yokes for a 12 bolt and how to identify them. I learned that they used the 3R universal on a 12 bolt as well. I thought they only were used on the AWW 10 bolt corporate axle.

Big Dave
07-03-2019 11:53 AM
67ImpalaSSConv Ok. The 3 5/8" measurement between the tabs is what led me to guess a 1330, the 1310 is about 3 1/4" I think. But it was cramped and dark and i was using a measuring tape without any reading glasses, so I could have read it wrong.. I'll have to recheck it.

The rear end doesn't appear to have ever been changed. Nor anything else on the old beast! But who knows after 50 years..

The driveshaft shop said the measurement would tell them which yoke it had so I'd better be sure. He did say that he only needed the width between the tabs and I thought he said it might have a different style if it were a posi vs a standard diff. But I don't remember exactly what he said about that, I might have heard him wrong. I am not sure if this one is a posi or not, but I'm suspecting not.
07-03-2019 11:23 AM
Big Dave All GM car rears made before 1972 (when GM dropped Spicer in favor of American Axel Works) used a Spicer 1310 universal joint. So your 12 bolt should have a 1310 joint.

That doesn't mean some one couldn't have changed out a 10 bolt for a 12 bolt out of a light truck in the past that did use a 1330 U-joint. I hope not as a truck 12 bolt is weak compared to a car 12 bolt, because the truck rear wasn't built for racing but carrying weight. Because of this you have a small pinion and fewer gear choices, and the axles have huge bearings (with smaller OD axles) to carry weight.

Here is information provided by one of this boards sponsors, CARiD:

https://www.carid.com/articles/u-joi...placement.html

You can use the inside caliper (the pointy part) to measure your main cap at the edge of the parting line to determine the diameter of your you joint.

Note the reference to a tab being present on your yoke as to whether you need an inside snap ring universal or not.

Big Dave
07-03-2019 10:42 AM
67ImpalaSSConv
Rear diff yoke ID for '67 w/ 12 bolt main

So I am trying to ID my diff yoke to order the correct ujoint for my driveshaft shop to install.

It is a bolt on style and measures 3 5/8" between the tabs. It was hard to measure the cap diameter since the ujoint isn't there, but I think the bore is around 1.1". Can anyone help ID it based just on that width and vehicle?

It is a 67' convertible with a th400 and 12 bolt rear end.

(I suspect it is a 1330 style)

Thanks!

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