my 84 chevy pickup, with a 305 ( with some mods), th400, np205, 3.73 gears and 35s, tends to like lose alot of power and chug when im in 4wd and trying to drive through mud. it was doin this last night, like it would hesitate to move, and then it would all of a sudden start to move but still not with as much power as it should, it never used to do this, when i had 33s. but my cab mounts are also gone and the body lift pucks are basically sittin on my floor. so is it possible that the reason my truck is doin this is because the linkage for the tranny isnt all the way in gear, because of the front of the truck sittin lower, cuz of the cab mounts? and i know the tranny isnt bad. or is it just because i have a 305 and my tranny and tcase is suckin up too much engine rpm, and the gears arent high enough, to get enough power to get it to move in 4wd? I gotta get this fixed, cuz theres a 4x4 competition in June that I compete in every year, and i cant miss out cuz i did last year. Ive also got new cab mounts which will be tommorrow, cuz right now its raining. thanks for any help.