I had a similar problem with my Ford F350 automatic transmission between 2nd & 3rd gears. The dealer said I needed a new transmission, which would've been covered by the warranty, but since I only had about 18,000 miles I thought that seemed unlikely.
A mechanic friend disconnected the battery for 10 minutes to reboot the truck's computer, and I never had a problem again. It's free to try this out and of course, can't hurt. Take care reconnecting the battery correctly, and note it's important to take the full 10 minutes to let it completely power down.
Might be a longshot but worth a try.
It will not shift properly. The 1999 has an electronic governor and the 1994 has an hydraulic governor.
check vaccum lines on differential or by shift linkage
Yes.
An eight feet bed of a 2009 dodge will fit a 2006 dodge 2500 with a little moderation.
Throttle position sensor.
The auto would bolt up, but not shift properly due to different internal sensors and controls.
Yes
Lift pump on a 2007 dodge 2500
This is a Dodge Ram 2500 Van that was converted.
Yes.
NoNo
Dodge Ram 2500 car parts are compataible with dodge ram 2500. this way you know they are compatible and don't have to worry if something will not work