1995 Dodge Diesel - Automatic Transmission

Most Chrysler models use some sort of electronic controlled AT, 4 or 5 solenoids that control hydraulic pressure to 4-5 clutches and to the lockup clutch of the torque converter. In reverse mode, your torque converter is unlocked, therefore, fluid is flowing where it normally does not flow, by this a solenoid and check balls allow this to happen. The lockup clutch locks out 1st gear when other gears are engaged, my THEORY is a clutch issue, 3&4 are not energized during R, but 1 and 2 are,hence low reverse....what if 3&4 became energized while in R, being a clutch and solenoid issue...if you have access to diagnostic tool, it should tell you your issue, all this is controlled by the PCM, too