I have a 1982 ford F150 reg cab with 72,000 miles on the truck, the truck is only two wheel drive. well i got stuck in some mud and i got on the gas pedal a little and when i left the tranny felt like it was slipping. but it only does it in first and second and it only lastes up to 30 mph. Could i have got mud in the tranny or it is loose or did i just screw up my whole transmission and have to replace it? thanks for the help if there are any web sites that might help with this please state them to thanks again.