Did my transmission sh*T the bed? (1 Viewer)

[Concrete]

On my way out of the neighborhood today, my ‘93 HDJ81 with the a442f auto transmission upshifted VERY hard on a downhill and I started hearing a cyclical metal-on-metal sound. I turned around as soon as I heard it and parked the rig. At quicker speeds (15-20mph) I couldn’t hear the sound but at slower speeds it sounded like metal was rubbing on metal but only at a certain point in the “cycle” of the driveshaft rotating. I’m towing it to the mechanic tomorrow but does anybody have an idea as to what could have happened? I don’t have a good feeling about it…

 

[inkpot]

You spit out a brake pad?

 

[Concrete]

You spit out a brake pad?

I wasn’t braking on the downhill. Just coasting, with no throttle input. Don’t think it’s a brake issue.

 

[robnicko]

you could (hopefully) just have a UNI that has given up the ghost

 

[Kernal]

Check the front drive flange and CV joint splines to see if either are stripped??

Is it a grating, grinding, grrrrr, or harsh metallic zipper sound?

 

[Concrete]

you could (hopefully) just have a UNI that has given up the ghost

Could you explain what a UNI is? Shade tree mechanic here.

 

[Concrete]

Check the front drive flange and CV joint splines to see if either are stripped??

Is it a grating, grinding, grrrrr, or harsh metallic zipper sound?

It sounds like a grinding but only at 12 o’clock-2oclock on a 360° wheel, if that makes sense. When I’m rolling, there’s no grinding except for half a second at the same interval as if there’s one part that’s messed up, but the rest is fine. May try to get a video tomorrow but it’s seemingly beyond my scope of expertise as a weekend warrior with this stuff.

 

[RoaringFork]

Could you explain what a UNI is? Shade tree mechanic here.

Australian for u-joint

 

[MUDZLLA]

A slow speed upshift shouldn't hurt that transmission. If you were coasting downhill it's possible the upshift went 2 gears (2nd to OD) in which case the truck may have free-falled for a second then the transmission engaged just as the torque converter locked up. This would account for the hard shift. Might have broke something.

I would check the driveline first though. You said the noise cycles in unison with drive shaft rotation. The driveshaft rotates at transmission input speed only in 3rd.

 

[WCBlueSky]

Does it make the noise in neutral? Could also check for metal shavings. Either drop the pan, or there is a speed sensor on the top of the transmission with a magnet which doesn't require dropping the pan, if there are shavings on the sensor you are in trouble. When mine died there were shavings everywhere. It didn't make any noise in neutral though.

Grinding noise: A442F Transmission Failure - https://forum.ih8mud.com/threads/grinding-noise-a442f-transmission-failure.1187315/