4 wheel drive pops..

[Wow]

Wanting to know if anyone can tell me why my truck pops in 4 wheel drive? Its a 77 3/4 and i put it in 4 high and about every 100 yards or so it pops and kinda jurks the truck a little. The 4 wheel drive is working but dont know where to start with this.
I had a 82 that did the same exact thing and never did figure it out.

Thanks for any help..

 

[blacksnapon]

Wanting to know if anyone can tell me why my truck pops in 4 wheel drive? Its a 77 3/4 and i put it in 4 high and about every 100 yards or so it pops and kinda jurks the truck a little. The 4 wheel drive is working but dont know where to start with this.
I had a 82 that did the same exact thing and never did figure it out.

Thanks for any help..

On each end of the truck, everything has to be the same (tire size, tire pressures, axle ratios, etc.). After verifying this, then you can start on parts. Lockouts, axle splines, u-joints, transfer case chain and gears.

 

[wizzard351]

u joints!!!!