98 24 valve 3500 Ram. Overdrive goes in and out between 43 and 53 mph under lite load. Trans recently rebuilt. Old trans did same thing. Any answers?
....well here's a guess...The TCM is trying to control through vacuum modulators....thinkin' maybe the vacuum lines are bloated or dry and cracked...and leakin' vacuum....SO go to the specialty section and buy a reel of silicone vacuum tubing and replace ALL vacuum lines in all circuits..(all police cars use and BMW) uses this~
I replaced the vac line from the tcm. It didn't fix it. Where is the vacuum coming from?
is going to be manifold vacuum~