12 bolt posi spider gear/cross pin play

[D0ublezer0x]

Hey everyone,

 

I was doing a oil change on my 12 bolt and noticed some slop in the spider gears and cross pin. I was wondering how much is "normal" for these and if you guys can spot anything else that concerns you.

 

Thanks!

 

[72MC]

Based on the naked eye, that's too much play. With a magnetic base and a dial indicator on the ring teeth, you should only move .006-.010. Was it set up correctly to begin with? Do you hear whining on the coast or acceleration. Your vid looks like you're pushing > .050. As long as all the gears look good, it just may be a clutch pack or shim issue. - Dave

[D0ublezer0x]

Based on the naked eye, that's too much play. With a magnetic base and a dial indicator on the ring teeth, you should only move .006-.010. Was it set up correctly to begin with? Do you hear whining on the coast or acceleration. Your vid looks like you're pushing > .050. As long as all the gears look good, it just may be a clutch pack or shim issue. - Dave

 

Don't have a dial indicator but I think I'll pick one up as this is the third time I wish I had one. I have no idea if it was set up correctly in the first place and I kind of doubt it was looking at some of the other shady things done on the car. It does whine on coast at around 50 MPH.

[Mike 57]

Looks like the posi clutches are shot. I would drop the cross shaft and check the play on the shaft and spyder gears

[footballubet]

What are you turning to check the play? Wheel, driveshaft?

[Jason72]

I second what Mike said...

[D0ublezer0x]

Thanks for the replies guys. I was using the wheel to rotate the axle. I think I'll just be nice to it until the end of the season and do a full rebuild over the winter.