Can’t shift on the fly 4WD
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Rookie
Joined: May 2018
Posts: 60
Likes: 1
From: Idaho
Can’t shift on the fly 4WD
Hey guys, only lately I’ve noticed I cannot shift into 4Hi while rolling, it will only go while completely stopped. Either situation I am in neutral. It makes a sort of quiet metal ‘rubbing’/syncro attempting to work’ type of noise, when you pull back on the lever while rolling. Not a violent or bad sound. I’ve looked around on forums and can’t find anything except this:
“Note: During cold weather (below 30F.) it may be more difficult to shift the transfer case while the vehicle is moving. If so, stop the vehicle and shift.”
Sure enough it’s been cold, have you guys experienced this during cold weather? Maybe that’s it, but I’ve never heard of the cold affecting this.
“Note: During cold weather (below 30F.) it may be more difficult to shift the transfer case while the vehicle is moving. If so, stop the vehicle and shift.”
Sure enough it’s been cold, have you guys experienced this during cold weather? Maybe that’s it, but I’ve never heard of the cold affecting this.
Champion
Joined: Feb 2007
Posts: 3,103
Likes: 109
From:
RPMs have to be idle. Shift N, let it coast a bit and pull firmly back. Should pop in. I had trouble for years and mine is a stick which means I just push in the clutch and pull. If it works while stopped, it will work rolling. But not too fast. I think the fastest I've done it is 50mph.
Administrator
Joined: Apr 2010
Posts: 87,437
Likes: 4,217
From: Clayton MI
Yeah, according to the manual, you can shift into 4x4 at "up to" 55 mph..... Don't think I would wanna be moving that quickly though while shifting..... On my trucks, if I wanna hit 4 hi, I just let off the gas, and give the expensive stick a yank. Haven't had any problems doing it that way.
Record Breaker
Joined: Jan 2004
Posts: 1,428
Likes: 191
From: United States
Honestly I've always wondered how it gets the front d/s up to speed. I think what you're experiencing is trying to slide the collar in the t-case to engage the chain (and thus front output) but the rear is going "X" while the front is going ZERO.
Sometimes the collar is spring loaded such that when you pull the lever it's not a DIRECT mechanical link but rather preloads the collar with a spring so it'll slide and engage when the splines line up....which would happen because the front would eventually engage the CAD which would spin the front d/s to t-case front yoke to chain. BUT I actually don't think the 231 has said spring.
I service a '99 with the same symptoms but I never pursued it and the customer wouldn't be able to afford to pay me to solve it. My guess is wear of something in the 'case....but I'd need to open it up to diagnose
Sometimes the collar is spring loaded such that when you pull the lever it's not a DIRECT mechanical link but rather preloads the collar with a spring so it'll slide and engage when the splines line up....which would happen because the front would eventually engage the CAD which would spin the front d/s to t-case front yoke to chain. BUT I actually don't think the 231 has said spring.
I service a '99 with the same symptoms but I never pursued it and the customer wouldn't be able to afford to pay me to solve it. My guess is wear of something in the 'case....but I'd need to open it up to diagnose
Legend
Joined: Nov 2014
Posts: 8,098
Likes: 318
Honestly I've always wondered how it gets the front d/s up to speed. I think what you're experiencing is trying to slide the collar in the t-case to engage the chain (and thus front output) but the rear is going "X" while the front is going ZERO.
Sometimes the collar is spring loaded such that when you pull the lever it's not a DIRECT mechanical link but rather preloads the collar with a spring so it'll slide and engage when the splines line up....which would happen because the front would eventually engage the CAD which would spin the front d/s to t-case front yoke to chain. BUT I actually don't think the 231 has said spring.
I service a '99 with the same symptoms but I never pursued it and the customer wouldn't be able to afford to pay me to solve it. My guess is wear of something in the 'case....but I'd need to open it up to diagnose
Sometimes the collar is spring loaded such that when you pull the lever it's not a DIRECT mechanical link but rather preloads the collar with a spring so it'll slide and engage when the splines line up....which would happen because the front would eventually engage the CAD which would spin the front d/s to t-case front yoke to chain. BUT I actually don't think the 231 has said spring.
I service a '99 with the same symptoms but I never pursued it and the customer wouldn't be able to afford to pay me to solve it. My guess is wear of something in the 'case....but I'd need to open it up to diagnose
