got a weird one: truck stops rolling on its own

cccolin

New member
alright folks. This one is really baffling me. 97 5 spd with locker. 200k. Replaced the rear passenger wheel bearing about 15k miles ago. Never any problems with the locker. Truck does get some vibration in 4wd at highway speeds, but I run aggressive snow tires, so I'm assuming that's due to too much traction for full 4wd. Transmission has been real notchy for a while. No other issues.

About a month ago I was very slowly rolling in a parking lot, under 5mph, with my foot on the clutch, and my truck sort of gently came to a sudden complete stop on its own. It was very dark so I while I thought it was odd, I assumed I hit a speedbump or one tire rolled up against a rock or something.

However, it kept happening, and in the last week has gotten worse. While driving, it's totally fine. No hesitation, no dragging, no noise, no nothing. Totally fine. However, when just starting off or rolling to a stop, it's like there's a hump it has to get over, or a hitch, something catching. Hard to describe. When starting off, sometimes it's totally normal, but if it's at the "catch" point, I have to give it way more gas than I should to get it rolling, like the tires are up against a large speed bump right when starting off. Once past the "bump", it's fine again and I don't notice anything until I stop.

When rolling to a stop at a light, if I have the drivetrain disengaged (in neutral or clutch in), rolling slowly, the truck will suddenly stop like it hit something softly. Like a gentle lurch. If I keep the clutch in and don't press the brake, the truck will actually roll backwards sometimes after coming up against the "bump". Then when I start off, I will again have to give it more gas than I should to get over the hump in the rolling resistance again.

The weird thing is, based on how it acts, I would guess it was in the axles somewhere. It doesn't seem to be a drivetrain or clutch slip issue, but like one of the axles isn't rolling smoothly or something. However, when I had to replace the rear passenger bearing, the failing bearing was LOUD. with this, there is no noise at all.

Any ideas?
 
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Why would you drive in 4WD at highway speed? I do not think that is recommended. OK if it were ALL-wheel drive, bit not 4WD.

I dont think there's any problem with 4wd at high speeds only switching at high speeds. I dont have any mechanical reason for this but I have seem threads of guys on tacoworld taking their 4wd well beyond 100 mph without any adverse effects.
 
Why would you drive in 4WD at highway speed? I do not think that is recommended. OK if it were ALL-wheel drive, bit not 4WD.

because I live in Colorado and I spend a lot of time driving mountain passes covered in snow and RWD is scary as hell in snow. I don't go over 60 usually. My understanding is that as long as you switch below 60 and the road isn't dry, it's fine.
 
I dont think there's any problem with 4wd at high speeds only switching at high speeds. I dont have any mechanical reason for this but I have seem threads of guys on tacoworld taking their 4wd well beyond 100 mph without any adverse effects.

You have it right, there is no speed limit for 4wd in our trucks per the owner's manual. Engagement does need to occur at 62 or less mph, disengage at any speed. :cowboy:
 
You have it right, there is no speed limit for 4wd in our trucks per the owner's manual. Engagement does need to occur at 62 or less mph, disengage at any speed. :cowboy:

Cool. I almost said 62 but couldn’t remember where I got that number so rounded down.
 
Heat. Anything hanging up or sticking would create heat. Check all moving components with an infrared heat gun or flir. Flir would be very obvious.
 

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