1963 17 spline to 30 spline questions, is this such a unique diff?

[Jeremy 63]

Hi y'all,

Sorry for the delay. Just wanted to thank everyone for all the help and guidance. It has been amazing networking with you. I will keep you posted on the project.

Captainfab, you have been a mountain of resource, and I thank you for the effort you have put into helping me with this rear end.

I will be purchasing 30.5 length axles for this rear, along with a new 30 spline posi carrier and all the internal parts to go along with it. The original 12 bolt was strong, and now it is time to make it stronger.

Many thanks and blessings to all of you.

Jeremy Franklin
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[mechanic58]

Sorry to dig up an old thread - but this question I have might be pertinent to the other information that is already in here...

WHAT YEAR did they switch from using the 17 spline pinion and axle to the 30 spline pinion and axle? I noticed that no one made mention so far of the early 12-bolt pinion also having 17 splines - they did. I have an axle that supposedly came out of a '65 model chevy truck, but it has 17 spline parts in it. I have also noticed that the wheel bearing/axle seal bore on this axle is just slightly smaller than a later model 12-bolt. Can anyone confirm this fact and also let me know what year they made the switch?

[Rannos]

I am not 100% on this but from what I have seen 65 was the change over year. Early 65 can have either and later 65 will be 30spline. 65 should also be the year the panard bar was relocated.
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[mechanic58]

Originally Posted by Rannos

I am not 100% on this but from what I have seen 65 was the change over year. Early 65 can have either and later 65 will be 30spline. 65 should also be the year the panard bar was relocated.
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The panard bar on this axle was attached to a welded on bracket on the passenger's side axle tube - not to a fitting on the center section casting.

[Reyals Bemus]

Originally Posted by lucifer

I took my 17 spline side gears out ...replaced them with 30 spline side gears and ordered 30 spline axles. ( same as 1965-66 trucks) They are actually available off the shelf from Summit Racing, Jegs and Moser axles.
Moser # A30 65GMTK

This is exactly what I did as well on my '64.

[Captainfab]

The '63 and '64 12 bolts both had the 17 spline side gears and axles. These also had the panhard bar bracket on the passenger side axle tube. The first year for the truck 12 bolt was 1963. These can be identified by the pressed on brake backing plates. In '64 they went to a flange welded to the axle tube and the backing plates bolted on. It has been many years since I have had to replace the axle bearings or seals on a '63-'64 12 bolt, but it does seem like they are slightly different.

Originally Posted by mechanic58

Sorry to dig up an old thread - but this question I have might be pertinent to the other information that is already in here...

WHAT YEAR did they switch from using the 17 spline pinion and axle to the 30 spline pinion and axle? I noticed that no one made mention so far of the early 12-bolt pinion also having 17 splines - they did. I have an axle that supposedly came out of a '65 model chevy truck, but it has 17 spline parts in it. I have also noticed that the wheel bearing/axle seal bore on this axle is just slightly smaller than a later model 12-bolt. Can anyone confirm this fact and also let me know what year they made the switch?

[mechanic58]

Originally Posted by Captainfab

The '63 and '64 12 bolts both had the 17 spline side gears and axles. These also had the panhard bar bracket on the passenger side axle tube. The first year for the truck 12 bolt was 1963. These can be identified by the pressed on brake backing plates. In '64 they went to a flange welded to the axle tube and the backing plates bolted on. It has been many years since I have had to replace the axle bearings or seals on a '63-'64 12 bolt, but it does seem like they are slightly different.

Thanks for that information, it seems to jive with what I have. This axle has bolted-on brake backing plates. The wheel bearing bore is 2.530" - I have noted on later, more typical 12-bolts that the bearing bore is approximately 2.570" (ish). The axle shaft dia is the same though at 1.618".

[Jeremy 63]

Hello Y'all,

Jeremy here. It's been a long time since I've been here. Some of you knew i was restoring a 63' C10 LWB over here in Germany (383 stroker, 700R4, original 12 bolt 17 spline with original posi, original Balboa Blue color), and many of you helped with questions I had. I thank y'all so much (especially Captainfab, Lucifer).

Last year the restoration was complete (6 years restoration). I got an A1 classification on the restoration from Classic Data. Was very proud of that. However, two weeks later while on a trip from Germany to Sweden, the truck (Jeddy) was stolen off the Bella Sky Hotel in Kopenhagen, Denmark. Jeddy has never returned. Info can be found on:

- type in google (Jeremy Franklin og Yvonne Franklin)

You can see everything we did to find our beloved Jeddy

Since then, I have purchased another 63' C10 SWB from World Wide Vintage Autos in Denver, and had it shipped over here to Germany. I have since torn it down to the frame, fire zinked the frame, tubular control arms, sand blasted all body parts and now starting body work. Pretty much doing the same to Jeddy II as I did to Jeddy I.

I've already got (for Jeddy II):

-Built 540 BBC (733 HP/730 NM Torque) from Big Al's ToyBox in CT (thank you Al)
-Built TH400 (manual valve) again, Big Al's
-Built 9 inch rear w/ 3.55 TRUE-TRAC posi, Sportman Gear Case - Race Pinion Support AND 1330-Short Yoke
- will be making many BIG parts orders to Summit again (thank you Summit Racing)

Wish you all well and keep ya up to date.

Roll on,
Jeremy

P.S.
Blue truck is Jeddy I
Other truck is new one, Jeddy II

[Palf70Step]

Sorry to hear about Jeddy. Your new ride looks great!

[Jeremy 63]

Pics of my others:

I'm loading up cars in Bremerhaven, Germany at the docks to bring home.

Many thanks to Jason Martin and Blake from Canning Auctions in Murphysboro, IL.

1965 Impala "Caprice" all original - matching numbers - only one year made
RPO: Z18
327 Turbo-Fire (250HP) SBC, powerglide, 10 bolt
Minor repairs - just get it running to sale off

1936 Chevy Sedan - all original
Straight 6
Needs minor repairs to body and drivetrain
Will be used for wedding and special events in the Dusseldorf, Germany area.

1939 Buick Century Eight - all original
Long term project
When complete and restored to original, will be entered into the Concours d'Elegance here in Europe.

[Jeremy 63]

Hey Palf70,

Thanks for the thoughts. We miss Jeddy I very much, and we are hoping Jeddy II will turn out much better.

Frame fire zinked
Suspension
Getting ready for major body operation

[The Rocknrod]

Alright I'll bite - what is fire zinc? Is that like Galvanizing?

[Jeremy 63]

Hey RocknRod,

Yes, the frame it's galvanized.

[Jeremy 63]

Hey RocknRod,

How are you? Hope all is ok.

Yes, the frame has been sandblasted, then dipped in cleaning acid (a 7 times process), then galvanized.

[shortstep60]

If you guys need any five on five 17 spline axles made up Moser axles can build you a set. I had a set made up for a posi rear end that's going in my 65 with a bbc . Talk to Homan at Moser axles and he will get you fix up