The Stovebolt Site Forums The Parking Lot Tons 'o Fun 1970 - C30 Rear Differental Yoke

I have a 70 C-30 that has a wobbley yoke on the pinion. It looks like I can remove it without affecting the preload, would this be correct? also what brand rear would this be....all answers greatly appreciated...Thanks

A loose yoke usually indicates there's bearing wear behind it. Unless the nut has come loose, there's no reason for the yoke to suddenly develop any looseness because it's tightened to hundreds of ft/lbs of torque, and usually cotter-pinned into place. If the yoke is wobbling, the preload is completely gone. so it's wise to do a complete teardown and inspection.

If the center section of the axle can be unbolted at the front, you've most likely got a HO72 axle. If there's a one-piece housing with only a rear cover plate, it's probably a Dana type 70. (Mostly used in GMC's)
Jerry

Perhaps I should have mentioned it...The rear is as quiet as a church mouse... if the preload is gone shouldn't the rear be howling? Yes the pumpkin comes out from the front,The tag on the door jamb identified the rear axle as (GE6 or G86) no spin. The yoke is so sloppy it appears that the splines on the yoke are jumping the splines on the pinion starting from a stop with a load but not always, just sometimes. And again, it appears that there's a seperate nut for the preload... Thanks for repling...

Sounds bad enough that I'd sure want to dissemble and find out what the whole situation is before buying a new yoke for it, chances are it'll take more than just a new yoke to fix it properly.

Then having been through the whole thing if it turns out that the yoke was the only trouble you will have peace of mind knowing the rest really is OK.

Grigg

I am looking at an exploded view of an Eaton single-reduction differential with the NoSpin option. There is no separate preload adjusting nut. The pinion nut also provides the preload for the two tapered roller bearings that position the pinion in the carrier assembly.
Jerry

I'm relying on memory as the truck was put away for the winter...I will dig it out this weekend & be more accurate in my description...I also will try to upload pics....

Got the truck out & refreshed my memory....it seems I was viewing that removeable flange thinking it was part of the yoke, but the nut obviously goes to the pinion....actually the play might be in the bearing...I'm just surprised that the rear isn't howling...