1965 Differential oddity

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May 26, 2026 | 08:47 PM

GTR1999

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From: Connecticut, USA

1965 Differential oddity

I am building a 65 diff now. This one has been worked on before, there was an old set of Richmond 4 series 411 gears in it when it came in.
However, there is something a little different about this one, anyone see anything?

The housing is dated March 1964 and was an original 411 diff. Stamped AP - 327 with 411

May 26, 2026 | 08:58 PM

TCracingCA

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From: California

Clearanced for a 12 bolt ring gear. So give us something hard!

Last edited by TCracingCA; May 26, 2026 at 08:58 PM.

May 26, 2026 | 09:03 PM

GTR1999

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From: Connecticut, USA

Quote:

Originally Posted by TCracingCA

Clearanced for a 12 bolt ring gear. So give us something hard!

No, this is not a 12 bolt conversion.

May 26, 2026 | 09:29 PM

rccarson

Racer

Joined: Jun 2013

Posts: 326

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From: The Great Pacific Northwest Washington

Hi Gary!
Is it the drain plug and drain cavity under the pinion bearing?
Reg

May 26, 2026 | 09:37 PM

GTR1999

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From: Connecticut, USA

No I tapped that today

May 26, 2026 | 10:20 PM

Mike C#2

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Left bearing cap missing the tab on outside? Almost like it’s machined off center?

Last edited by Mike C#2; May 26, 2026 at 10:21 PM.

May 26, 2026 | 10:43 PM

acstephenson

Instructor

Joined: Dec 2025

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From: Pachuta, MS

This may be a perspective problem but it sure looks to me like the pinion bore is misaligned.

Yesterday | 12:22 AM

GTR1999

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From: Connecticut, USA

Quote:

Originally Posted by Mike C#2

Left bearing cap missing the tab on outside? Almost like it’s machined off center?

Winner, different bearing caps for the year.

Last edited by GTR1999; Yesterday at 12:25 AM.

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Yesterday | 04:15 PM

GTR1999

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From: Connecticut, USA

Just a note about this. The right cap was not used on a 65, at least none of the many 65's I built. I cannot say for sure it didn't come from the factory like this but chances are the cap was replaced. While it was a close fit, I did in fact refit it for the correct fitment. The caps are both fine and no one is going to open a diff to judge caps. Just something that wasn't right that I picked up.

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