my 4WD low will not engage 100 % of the time, or really even 5% of the time, almost got stuck tonite and i really needed it to avoid tearing up my driveway, so i had to tear it up because it would not engage so i could climb out of the 15" Ruts, i had a new auto put in 10K ago with a hi-perf torque converter, it shudders from take off but goes away pretty quick under accelleration. Is it because of the chip and the tires? Btw i love it when the converter locks sometimes around 2k and it will pull it all the way through the powerband with full throttle . most of all, whats up with the 4wdLOW range not working?

 

Are you stopped, in neutral, and foot on break with working break lights?

Adrianspeeder

 

all the above

 

Brake lights work 100% of the time? If the brake pedal switch is intermittent, 4L will be intermittent.
You also didn't state whether you had MSOF or ESOF.

 

What's msof or esof??

 

MSOF = Manual Shift On the Fly - You have a shift lever for 4wd
ESOF = Electronic Shift On the Fly - You have a rotary dial for 4wd