comes out of gear when cold

[timmytim]

My truck has a auto i believe its a c4. My problem is when I first start truck up if i dont let truck warm up b4 i drive it, the first time i pull up to a stop,it kicks out of gear.I normaly shift it to N then back to D and I dont have anymore problems. Any idea what would cause this

[cep62]

Have you checked or changed the fluid lately?

[BobbyFord]

Have you checked or changed the fluid lately?

sounds like a low fluid level condition...

[timmytim]

I have check level and its full. I was told it was completely rebuilt about 4 years ago and before i bought truck it was driven very little.Ive owned it since april....Im thinking there maybe some varnish on seals ect. and i should have it flushed but i know how risky it is to change tranny fluid so wanted to see what u guys thought.

[BobbyFord]

What is the condition of the fluid? Color, smell, etc. What are the shift points like once it's warmed up? Shift too early, too late, just right?

[timmytim]

shift points are normal. for some reason (i dont remember why i did this)i had to undue the trans lines from the radiator and it leaked out about 3 qrts. the fluid was black.

[BobbyFord]

It may be time for a trans service. Cooked fluid is not a good sign and changing it may not make a difference.