i've got an 87 pickup carbed 5 speed, and anytime i put it in 4 hi it bogs out. put it in 4 lo and works fine. anyone have any idea what could be causeing this?

 

Do you mean when you wheel it in 4hi it bogs down but doesn't when you drop it in 4lo and try the same trail/line/climb/mud hole/etc?

What size tires and what gears are you running?

 

if ur offroad just 4 low i cant stand wheeling in 4 high. low range gives u so much more control and is alot easier on your clutch

 

yeah even when i'm in my driveway in 4 hi which is flat and kinda down hill can barely get the truck to move. it only has 4.10's with 32's. the problem is with low is when i put it in second gear its knocks it out of 4 lo. i dunno if has something to do with the body lift or if theres somethign wrong with the shifter.

 

4.10s and 32's isn't your problem. Something else is going on. I would go with your guess about the Body Lift.

 

i can see the body lift being the problem with the shifter i'm gonna work on doing something with that, but not the bogging out. i think when i bought it in the winter i had it in 4 hi to drive it home cause it had slicks on it and i dont remember having any problems. and i'm sure recently out fishing and stuff i may have had it in,but it could have been in lo. the only thing i've done with it recently is replace the head gasket but i cant see that having anything to do with it either. i even put it in 4 hi with the hubs in the free position and it still bogs out.