Hi, Tried to search this with no luck. Probably me. At mile 400 of 425 today, I noticed the trans came out of OD and I was running 2500 rpm. Also noticed the temp was about 235 on gauge. I was thinking that maybe if the temp is too high the trans won't go into OD to help cool the engine. More revs, lighter load more cooling. If this could be true, then a stuck thermostat or other cooling issue could cause problem. Drove 425 on Friday and 425 back today. only acted up on last 25 miles today. Any thoughts?