DieselAmateur
She ain't revved 'til the rods are thrown...
Howdy gang,
So out of nowhere, at a very inconvenient time, my 4WD decided to stop working.
Short history: T- case is original as far as I know. Drained and filled with new fluid last April.
4WD worked last Friday. Topped off gear oil in front diff as I had a long day of hauling ahead of me Saturday. Towed empty equipment trailer down to southern PA, towed back ~9k load same day. Smooth sailing and no issues that I know of, although transmission is dying a slow death but that's another story and I believe to be independent from this 4wd issue.
Went to move truck and trailer today, still loaded down, and truck will not go into 4 high or low.
Checked fuse 24 (4wd) in side dash fuse panel and it was blown. Of course it couldn't have been that simple, replacing the fuse made no difference.
When shifting into 4HI, the light around the floor shifter doesn't light up, and 4wd doesn't engage, but stays engaged in 2wd as truck will still move in gear.
When shifting into 4LO, the light on the floor shifter does go on, but truck seems stuck in neutral as the truck won't move when transmission is put into gear.
The previous owner had already upgraded the 4wd actuator to the newer non- thermal type.
Truck drives fine/ normal in 2wd
So, based on all the above information, any ideas on what the issue is? I cleaned the electrical connections on the 4wd actuator wires and the wire that plugs into the top of the t-case, not the one at the end of the tail shaft (think this one is for speedo?) Cleaning these electrical contacts didn't help/ change anything
What has me tricked up is the light going on in 4HI but not 4LO. And the fact that the rear is still engaged in 4HI but nothing is engaged in 4LO leads me to believe the culprit is the T-case and not the actuator. I'll happily swap in a working actuator before pulling the t-case, but if there's anything else to test/ check, I'd sure appreciate the help
So out of nowhere, at a very inconvenient time, my 4WD decided to stop working.
Short history: T- case is original as far as I know. Drained and filled with new fluid last April.
4WD worked last Friday. Topped off gear oil in front diff as I had a long day of hauling ahead of me Saturday. Towed empty equipment trailer down to southern PA, towed back ~9k load same day. Smooth sailing and no issues that I know of, although transmission is dying a slow death but that's another story and I believe to be independent from this 4wd issue.
Went to move truck and trailer today, still loaded down, and truck will not go into 4 high or low.
Checked fuse 24 (4wd) in side dash fuse panel and it was blown. Of course it couldn't have been that simple, replacing the fuse made no difference.
When shifting into 4HI, the light around the floor shifter doesn't light up, and 4wd doesn't engage, but stays engaged in 2wd as truck will still move in gear.
When shifting into 4LO, the light on the floor shifter does go on, but truck seems stuck in neutral as the truck won't move when transmission is put into gear.
The previous owner had already upgraded the 4wd actuator to the newer non- thermal type.
Truck drives fine/ normal in 2wd
So, based on all the above information, any ideas on what the issue is? I cleaned the electrical connections on the 4wd actuator wires and the wire that plugs into the top of the t-case, not the one at the end of the tail shaft (think this one is for speedo?) Cleaning these electrical contacts didn't help/ change anything
What has me tricked up is the light going on in 4HI but not 4LO. And the fact that the rear is still engaged in 4HI but nothing is engaged in 4LO leads me to believe the culprit is the T-case and not the actuator. I'll happily swap in a working actuator before pulling the t-case, but if there's anything else to test/ check, I'd sure appreciate the help