Auto trans problems with holding gear

[dr084]

I have a 99 24v 2500 2wd  Mostly happens when truck warmed up' It will drop out of OD and sometimes then drop to 2nd. I have dome all the cleaning up etc. I have fresh pink fluid no slipping just wont stay in od mostly. A funny thing is when it does this if you set the cruise it will take off running faster.Trans was rebuilt according to previous owner but don't know who. I have been told that the shifts are controlled by electric in trans. Have not but do intend to replace VSS, but got a feeling it is more then that.  Thank you for any help  [i do have a new alternator on way for lock/unlock problem.

[JAG1]

Could this be as simple as some bad grounding?  Others will hopefully chime in & add to this.

 

 Do the simple inexpensive steps first anyway. Should test even a new Alternator. Battery clamps and posts clean, good batteries.etc.

 

I remember reading about changing some of the trans sensors over to Borg Warner too.

 

How many miles on it?

[dave110]

3 & 4 are electrically controlled. 1 and 2 are mechanical. I'm no expert but maybe the governer pressure solenoid as it seems to be a weak link for some

[dr084]

All ready did all grounds clamps any wire I could get too,even power contol modual wiring and grounds,have not done anything with trans wires from under truck ty for replys,again I keep seeing stuff about solenoids in trans pan

[Mopar1973Man]

ECM, PCM and VP44 are on the Passenger side negative battery cable. There is no body grounds for these 3 computers.

 

Any error codes? Yes error codes can exist without tripping a check engine light.

 

Any programmers on the truck previously?

[CTcummins24V]

If the governor solenoid and pressure transducer have never been replaced as far as you know or it's the original trans, it's time to replace them. They're almost wear items in a dodge. It's a good starting point for not a huge cost, and new fluid obviously. You can by these parts individually, borg warner solenoid, pressure transducer and 3-4 spring. Make sure they're for a 99'. Can't say for certain they'll solve everything, but when I got my truck, all I had was 1st, 2nd and sometimes 3rd. When it warmed up, all I had was 1st and 2nd. See link

 

http://www.cascadetransmissionparts.com/47regovernorpressureservicekit9899.aspx

[dr084]

yes on neg cable extra clean.  when I got the truck it had a broken ob2 connector[under dash] it has a replacement exhaust with straight thru, no muffle etc looks like 5 inch. with busted connector I suspect it had a programmer or some thing. Have checked codes only code is the one for too much boost got a junk yard connector and using Your wiring diagram replaced it. [thank you for posting that] That link and kit is probably how I will go.there is a wire from edge of pcm? next to air cleaner and it goes to a block ground, cleaned it I spent almost 8 hours on cleaning wires, and all connectors. Truck was used to travel the country picking up old/ antique motorcycles on a 20 ft trailer. Looks like good care but think trans, and a ps gearbox going out made the guy trade it to his friends motorcycle shop for a newer truck.