I've got an issue with my TH350. Earlier in the year I had an issue with the trans not wanting to engage while in gear ,off and on. Traced it to a vaccum line that was split. I replaced that and the issue went away for awhile. Now I'm having an issue with having to rev the motor to get the trans to engage (doesn't matter if its a forward gear or reverse) . Then it seems to work fine while driving. Is this a modulator going bad or something else??

having to rev the motor to engage the trans sounds like the filter is dirty .... at which point I'd bet the trans in not long for this world .. drop the pan & service the trans !!! look to see how much clutch linning is in pan :sad:

that's not what I wanted too hear!..lol..this trnas only has maybe 1K on it...wel I guess this is the time of year to make repairs if needed