i drove my truck around in fwd for a while when i was getting my driveshaft balanced and it was hell lol. especially since i have lockers, turning was almost impossible unless i took it of gear, if i didn't it would make this awful clunking sound. the truck would pull really hard if i accelerated also. i know the locker had a lot to do w/ this(along w/ minute differences in tire size), but i was wondering if it was b/c the cv axles are of different lengths.

*edit- i just noticed that you said your buddy already suggested this. i know that torque steer is a problem under hard acceleration on honda civics b/c the cv axles are of different lengths, but i'm still not sure if this is the cause of pulling in fwd on our trucks.

as for your question, i'm not sure if my advice is still relevant since i have lockers. but when i jack the front end up and spin one tire w/ both hubs locked, occasionally neither the opposing wheel nor the driveshaft will spin unless i turn the driveshaft a little bit clockwise to engage the other wheel. after that, both my tires will spin in the same direction. thats in 4wd of course.