4L60E No Gears When Warmed-Up

[Syberhurt1]

I have a 1993 GMC Yukon with a 4L60E transmission. Once the vehicle warms-up I loose all gears, foward/reverse. My fluid level is good, indicates high with engine off and drops to normal with engine running. Any ideas?

 

[firefighter_2319]

front pump maybe?? did it just start?

 

[Aloicious]

moved thread to where you might get more feedback.

 

[Syberhurt1]

It all happened within a few minutes

 

[Darkrider]

I have a 1993 GMC Yukon with a 4L60E transmission. Once the vehicle warms-up I loose all gears, foward/reverse. My fluid level is good, indicates high with engine off and drops to normal with engine running. Any ideas?

Sounds like the clutch disks are worn to the point that once they warm up they have no more friction to make the internal connections needed to move.

Sent from a 6.5 Detroit Diesel powered smartphone

 

[rhino]

The filter is stopping up....Probably something going bad causing a ton of metal stopping it up thought. Usually they will have a small whine when this happens, the pump starving for fluid. When you cut it off, the fluid drains back to the pan through the filter unstopping it.

 

[Syberhurt1]

You were right on-the-money Rhino. I changed filter and reserviced the trans and everything works great. Thanks.........

 

[silverado13]

i second the pump