Is it ok to put lucas transmission fix in a 5 speed allison? My truck jerks when downshifting from 2nd to 1st, but only when its cold from sitting over nite, it stops by the second or third stop sign.
No it won't not in that short of time. The transmission needs a load on it to really get it warmed up. That is why allison built it to not lock the converter until 86*. Even the engine won't get to operating temp until it is under load.
Not the transmission. My engine gauge will move in that time on high idle but the tranny will not. I'm not trying to argue with you but these trucks just don't work that way. Maybe yours warms up faster because it's a built tranny.