99 F-250 transmission problem

only in reverse ?

Yep, only in reverse. That what stumped me? I can drive miles, but once I shift into reverse fluid comes pouring out.

This problem seems to be the case. I have 3 F350's in my files over the past 2 years that have caught fire when this happened. All three were found with the dipstick pushed out a couple of inches and the right side of the engine compartment doused in trans fluid. It also appears to come from the case vent which would indicate the case vent to be clear. There is no indication of seal leakage. It does not appear to be related to heat as one of the units had been parked for 6 hours just before it started to back up with an equipment trailer. It had moved less than 50 feet when it burped and caught fire. One of the 3 had this happen in two prior occasions without catching fire. Trans was pulled and built after each event. If anyone comes up with a cause for this, I would sure like to hear about it.

Lugnut

Wow, that's scary. Thanks for the heads-up. If I find the cause I'll let you know.

Off the top of my head I can think of two things that could cause this. One is a bad leak in the reverse clutch pack that it routing a lot of oil back to pan in a path the is trapping some air and bubbling fluid out, the other is a bad leak in the valve body reverse circuit that is doing the same. Some how a lot of fliud is being expelled internally were it is not supossed to be and it is trapping air in the process through leakge and or areation caused by the leakage and causing the effect you have. Also with a big internal leak the pump could be cavitating and sucking air and creativing a oily foam that would vent out too.