I don't think RPM should drop if in OD range when is meets all the requirements to be in OD since it is not coasting gear per the snipet I posted above. I need to take it back on the road to confirm if it is commanding 4th. That can't happen right now since I'm in the middle of fixing some...
Per the 4L80E manual I interpret 4th as a compression brake gear, see attached snipet. It also says that manual 3rd range is a coasting gear. If this is the case, then when my RPM drops RPM when coasting while in OD range, I very well could still be in 3rd and never even get to 4th. I'm also...
Thanks for the info. The scanner is Autel Diaglink MD802 on Amazon for like 88$. You get 1 vehicle make for free and additional is 10$ each. Pretty clunky interface and refresh is quite slow, frame every 2sec if you are reading a page of 4 blocks and up to 5sec if you capture all the TCM blocks
Hello. I have a 1999 P30 motorhome with a 7.4L and 4L80E that appears to not stay in OD. When fully warmed up in OD range at 55mph I'm at 2500RPM (which is 3rd gear). If I coast down a hill and fully lift off the gas, the RPM drops down to ~1300RPM. As soon as I give it some gas, the RPM...