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1995 Suburban K1500 grinding noise coming from transmission

E

eremoao

Member
Sounds like the grinding noise I have talked about earlier as coming from the rear-end is actually coming from the transmission. I have removed the tire and brake, the brakes look good, the axle seems fine, when turning it it doesn't grind and seems to be ok. The u-joints are tight and there is no play in the drive shaft.

So that brings me to the trans mission. Fluid level is fine, doesn't smell burnt. Noticed when you here the grinding sound the loudest is when putting back into park, seems like even when stepping on the brakes, the transmission is still turning the drive-shaft. It is like when you don't let the car come to a complete stop and jam the car into park.

Could it be something to do with torque converter.
If you have any questions let me know, your help is appreciated.
 
Could certainly be the torque converter. They can go bad. They can leak and dry up, and away they go. My experience with automatic transmisions is that very few people are good enough to work on them, and if and when you find someone that is, keep him/her/them. Auto transmission isnt a novice repair, so I would stink at it. Torque converter was one bad piece when my auto trans went in my '02 3/4 ton 4x4 Cummins Dodge at around 50K. I don't use it much, so the warantee went before the trans did. Was rebuilt by a three shop local chain that is member of a nationwide group called ATRA (Automatic Transmission Rebuilders Association) that honors the warantees of the other member shops. In all of my years, short of buying a rebuilt and installing it myself, until now, I had yet to find anyone that was good on repairing or rebuilding them. This time, I got someone that did both of my Dodges and I'm keeping them as long as I can.

Good luck. When it comes to automatic transmissions, I stink up the joint as bad or worse as the worst, and admit it honestly.

Mark
 
If the torque converter leaked and dried up, the truck would no longer move. I assume it still does.

A torque converter is a fluid-coupling. With no fluid - no coupling is possible.
 
I'm assuming you've got a 4L60E. Maybe you got an over-running clutch going bad? It's a weak point in that trans, but more so with the older ones.

Other possibilities - include the clutch disk inside the torque-converter is dragging. Front clutch pack dragging. Or the parking-pawl return spring fell off.

You mentioned . . . "seems like even when stepping on the brakes, the transmission is still turning the drive-shaft."

Please explain with more detail. Does it want to move all the time even with the engine at idle speed?

You stated earlier you saw a back wheel wobbling when the noise came. What was that about?
 
You have a point. When the torque converter went on my pickup, I limped a mile or so home, called the trans shop, and took it to them the next day down infrequenly travelled back roads, not getting over maybe 10 or 15 or 20 tops the whole way, about 3 miles.

As I said, when it come to auto transmissions, I stink up the joint as bad or worse than the worst, and openly and honestly admit it. Fred's rebuilt mine just fine, and I'm keeping them.

Mark
 
I had my wife in the truck, had her put it into park, made the loud grinding noise and noticed that the back left axle was still turning. Drum is off.

The back wheel was not wobbling, it sounded like a grinding noise and the back wheel was vibrating. The wheel was off the ground at the time.
 
It's normal operation for the trans to drive (or attempt)the the rear wheels with the engine running. In neutral there is enough friction to turn the drive shaft with the engine running. Putting the trans in park with the shaft turning will make the grinding sound you heard.
 
Nope son in law just went though this. Pro tranny shop thought it was his front differntial...nope, broke snap ring in the transfer case!


Rick
 
Back up a minute and bear with me!

I can just about guarantee you that your wife stepped on that brake pedal while she was in the truck when the drum was off. :>)

And, you can forget the loud ratcheting noise when going back into park as that is a normal thing with no rear brake applied.

Take a couple of big screwdrivers and walk those brake shoes back down against their anchor bolt and then put the drum back on. Install two of the lug bolts upsidedown to hold the drum on.

Of all the thousands of parts in that truck, the converter is probably near the bottom of the list for failure.......but, they can and do go bad.

Get back in the truck, pump up the brakes to make sure they are holding, with your foot still on the brake, PUT THE TRANSMISSION IN NEUTRAL and start the truck.

1. Do you hear any noise with the transmission in neutral and the brakes applied?

2. With your foot still holding the brake, simply shift the transmission to drive. Do you now hear the noise?

Hollar back.

Allan
 
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