Anybody Know Halfshaft Lengths?

Anyone know the center to center length of early and late C3 halfshafts and perhaps C4 halfshafts?

BBShark said:

Anyone know the center to center length of early and late C3 halfshafts and perhaps C4 halfshafts?

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13 and 13/16ths is the loop center to loop center length of my extra early shark steel 1/2 shaft laying on the shelf.....just measured it at 100f in the garage.....YMMV on that length depending on temps.....:hunter::clobbered::bullshit:

BBShark said:

Anyone know the center to center length of early and late C3 halfshafts and perhaps C4 halfshafts?

Click to expand...

The C4 shafts I have laying around look to be 18 1/8 inch, give or take a sixteenth.

Wow, I had no idea the C4's were that much longer. Wonder if they could be shortened (reliably).

Looks like 63-79 is 13 7/8 and 80-82 is 13 1/2.

Sure, just put them in a lathe and cut out the weld, the ends will fall off and then shorten the tube and reweld. Any axle shop can do that.

C4's are aluminum w/1330 u-joints right?

BBShark said:

Wow, I had no idea the C4's were that much longer. Wonder if they could be shortened (reliably).

Looks like 63-79 is 13 7/8 and 80-82 is 13 1/2.

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Yep. Any driveline shop can do that, and rebalance them. $80 or so.

Just for kicks, I weighed one of the spare C4 shafts I have laying around. According to my Sunbeam bathroom scale, it appears to be 6 pounds (with both u-joints). Anybody got a C3 shaft and a scale to give a rough comparison to the C4 shaft?

69427 said:

Just for kicks, I weighed one of the spare C4 shafts I have laying around. According to my Sunbeam bathroom scale, it appears to be 6 pounds (with both u-joints). Anybody got a C3 shaft and a scale to give a rough comparison to the C4 shaft?

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A 2 1/2 C3 shaft w/u-joints is 9lbs.

The C4 ones I had were 3" alu w/ 1350s, was from a manual though.

Twin_Turbo said:

The C4 ones I had were 3" alu w/ 1350s, was from a manual though.

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It's my understanding that there was just one model/version of C4 shafts.

I thought so too, so if so, they all use 1350 joints on the halfshafts and 1310s on the driveshaft

A C4 uses 1310's on the driveshaft?

Yes, even the Dana 44, same as 80-82. Here's a C4 D44 next to an 82 D44, same 1350s on the halfshafts ad 1310s on the driveshaft

The 80 and 81 automatic Dana's use 1330 joints on the halfshafts, The 4 speeds used the 1350.
Mike

So it sounds like I could use shortened C4 aluminum halfshafts with my C3 stuff. I really need halfshaft about 14 7/8 inches long. Maybe this is the answer.

BBShark said:

So it sounds like I could use shortened C4 aluminum halfshafts with my C3 stuff. I really need halfshaft about 14 7/8 inches long. Maybe this is the answer.

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For us inquisitive/nosey types, whatcha working on?

I am looking at using Brembo GT calipers and spot caliper for the parking brake. The parking brake is the challenge, it's a mechanical floating caliper that is deep enough that it interferes with the frame rail. If I had longer half shafts and reworked the trailing arms, the caliper would clear.