Re: Problem with my Ford F350 transmission pulling heavy load.
Welcome to TDS. Your best source for information about your truck (Much more informed than most dealerships!). You need to realize you should never back up a grade like that with your tranny. It can fry in just a few minutes. There is too little cooling and I do not believe the torque convertor can lock up in reverse. Next get a tranny temperature gauge. Your OEM gauge if equipped is an idiot gauge with three positions. Cold, normal and toast. Read this!
After this last incident, I would check the fluid. If it smell burned flush the entire system following this procedure.
On edit. Additional cooling might be a good idea. You need to see if you have an Oil to water cooler in addition to the oil to air tranny cooler. This was added to later model year trucks. You can add an otw cooler and/or replace your existing coolers with bigger V-10 or 6.0L oil to air coolers. Since you have a chipped truck and are out of engine warranty, you might contact some of the sponsors about reprogramming you PCM to shift better for heavy towing and give you the hp you need, I have not heard much about that chip but some are known to have problems with EGTs etc.
2002 F350 Lariat CC 4x4 Auto 4.10 DRW, DP-Tuner F5 live tuned stock, quiet, 40dd, 40, 60, 80 tow, 80e and 120r, B&W GN, BrakeSmart, 'pooned tank, tank and pre-pump mods, 2µ Dahl 100 filter, regulated return, BTS dual HPOP, AC singles with EDM 34 lpm nozzles, AIS, H2e, Spearco 6.0 IC, Hypermax 3.5" dp--> MBRP 4" 304SS exhaust, BTS tranny, 203º T-stat, Chevron ELC, coolant filter, Oilguard bypass with Schaeffer 9000, WranglerNW 200 amp alternator & Optima group 31 batteries, Nippon-Denso starter, SPA gauges, SteveRacer mods, Hella 80/100W 9007s, Hella Micro DE foglights, 1000FF driving lights, 220W backup lights, Stancor contactor, Michelin XPS Traction tires, X-Springs, Bilstein shox, custom bumpers but otherwise stock. Nov 30 '99 build engine with 16 K miles, Fluidampr, Comp Cam 910 springs, Melling LPOP and ARP headstuds.