Truck shakes and acts like it's about to stall when I slow down

[David Vandercook]

Hello everyone,
I hauled a load of gravel in my 86 w250 this morning for a project.my Truck was running great the whole way. I backed down our hill, unloaded, and proceeded to drive back up. I had to put it in 4h to get up the hill. I got back on the street, put it in 2h and parked. Then, this afternoon, I took it to the store. Every time I slowed down to stop, right before I came to a stop, it would shudder and act like it was bogging down. Just driving though, it was perfectly normal. What would cause this? One of my guesses was the transfer case stuck in 4h. Would that be a potential culprit, and is there an easy way to find out if it's stuck in 4wd? If not, what else would cause it?
Thanks

 

[chopperman1]

Drive in tight circles on dry pavement and see if you get any tire chirping.

 

[huntergreen]

When was the last time you changed your plugs and wires ?

 

[David Vandercook]

I changed them earlier this year, but I should check them out. My truck runs pretty dirty.

 

[Old Sarge]

Sounds like the torque converter is stuck in lockup mode. That's usually caused by low t fluid.

 

[David Vandercook]

Lockup mode? I thought 4x4 trucks didn't have that. I never felt it lock either.

 

[Mojo88]

Then, this afternoon, I took it to the store. Every time I slowed down to stop, right before I came to a stop, it would shudder and act like it was bogging down.

This kinda sounds like an ABS sensor issue to me. These are the exact symptoms.

 

[David Vandercook]

Well, it stopped doing it today, so I will pretend it never happened and hope it doesn't happen again lol

 

[Old Sarge]

Lockup mode? I thought 4x4 trucks didn't have that. I never felt it lock either.

My 2001 did. Don't know if my 20 does. In my 01 that was the issue described.

 

[Dodge trucker]

My 81 and my son's 80 were both 4wd and had lockup.
For whoever said "ABS" can't be they didn't have it yet when the OPs truck was new.

 

[Mojo88]

............For whoever said "ABS" can't be they didn't have it yet when the OPs truck was new.

Haha, yeah, my bad, I didn't even look at the truck year. It's kinda unusual for anyone to be asking questions about a '86 truck....not many of them left running............