Transmission problem

[joeblo]

I have a problem with my Gulf Stream. Even if I start or not the engine, when I turn the switch on, after about 10 minutes, the transmission shift automatically to the 4th speed! :shock:
It' a Gulfstream motor home 1994 with a 6 speeds Allison transmission and 250 cummins engine.
What's the problem, could you help me?
Thank you

[RayChez1]

I would take it to a transmission repair shop before you do more damage. It might be something like a simple adjustment.
Good luck!