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Puzzler - differential yoke

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Old May 31, 2023 | 03:31 PM
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Default Puzzler - differential yoke

Greetz all,

I’m just curious. It’s a puzzler. The yoke of my differential seems to be a combination of 1310 and 1350.

The cap size is 1 1/16 (1310). But the cross width is 3 3/16 (1350).

The drive shaft side is 1310 all the way.







I can’t imagine it was like this from factory.

Folks care to speculate?

Best

DC3
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May 31, 2023, 10:38 PM
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Ya, here's a Swedish differential yoke:

Sven walks into a bar and orders a beer.
The bartender says, "Ya Sven how ya gonna pay now/"
Sven says "I can pay ya vith dis gear" and sets a greasy gear on the counter.
The bartender replies " If I vanted your pinion I vould haf asked for it"
Old May 31, 2023 | 07:02 PM
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The 1330 and 1350’s have the same width but the caps are larger on the 1350. Believe you have a 1310/1330 combo which is not unusual.



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Old May 31, 2023 | 10:38 PM
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Ya, here's a Swedish differential yoke:

Sven walks into a bar and orders a beer.
The bartender says, "Ya Sven how ya gonna pay now/"
Sven says "I can pay ya vith dis gear" and sets a greasy gear on the counter.
The bartender replies " If I vanted your pinion I vould haf asked for it"
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Old Jun 1, 2023 | 12:49 AM
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Originally Posted by lowbuck72
Ya, here's a Swedish differential yoke:

Sven walks into a bar and orders a beer.
The bartender says, "Ya Sven how ya gonna pay now/"
Sven says "I can pay ya vith dis gear" and sets a greasy gear on the counter.
The bartender replies " If I vanted your pinion I vould haf asked for it"


So this could be stock then ??
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Old Jun 1, 2023 | 08:05 AM
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Not stock, but as mentioned, very common to see this combination.
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Old Jun 1, 2023 | 08:14 AM
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Understood - not stock. But is there any advantage to this ? Or just did a rebuild or from another source and snagged whatever was in the shelf

Last edited by DorianC3; Jun 1, 2023 at 08:23 AM.
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Old Jun 1, 2023 | 10:59 AM
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When I swapped the Tremec into my '79 I was unable to find a trans yoke that took the same size U-joint that was in the driveshaft. My solution was to source a combination U-joint. I don't remember exactly what the sizes required were. 1350/1310 sticks out in my mind but don't quote me.
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Old Jun 1, 2023 | 01:44 PM
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Just look at the pinion yoke on the diff. If it uses u-bolts to hold the joint it is a 1310, if it uses straps and bolts it is a 1330, 1350 was never optioned on vettes but will fit since the spline count and diameter is the same as the Chevy 12 bolt. 1350 will hit the tunnel of a C3 on the passenger side. 1310 & 1330 will not-unless there was glass work done from damage. Tremec usually came with 1310, The Keisler 1310 slip yoke we had leaked and broke under load. Mark Williams makes a strap type slip yoke which corvettes need but expect to pay an arm and a leg, or about $450
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Old Jun 1, 2023 | 02:16 PM
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Originally Posted by DorianC3
Understood - not stock. But is there any advantage to this ? Or just did a rebuild or from another source and snagged whatever was in the shelf
Not positive, but I suspect your car was originally delivered with a 1310 differential yoke and somewhere down the line, a 1330 yoke was installed, either through a rebuild/repair of the differential or because the differential was replaced with one that had a 1330 yoke. The 1330 yoke was introduced with the automatic transmission. So, faced with the situation of a drive shaft with a 1310 u-joint and a differential with a 1330 pinion yoke, the options are: a) replace the pinion yoke, b) replace/modify the driveshaft to accept a 1330 or c) install a 1310/1330 combo u-joint. Clearly, option c is the least expensive.
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