transfer case problems - The 1947 - Present Chevrolet & GMC Truck Message Board Network

coastal · 12-15-2002, 11:31 PM

I have a NP203 tranfer case with th350 auto/trans. that is very difficult to shift into 4hi. It will shift into 4low no problem, checked the fluid and its full. any ideas?

*mike reeh* · 12-16-2002, 03:01 AM

probably linkage

mike

chevychic · 12-16-2002, 03:14 AM

I'm so glad you asked this question! I'm kinda having the same problem. Except I can get into 4hi just fine. It's 4lo I'm having troubles with. Tried to go out and play in the mud today for the first time this winter and couldn't get it into 4lo. But I still had fun in 4hi

I'll be watching this thread to find out what kind of replies you get.

79BIG10 · 12-16-2002, 05:24 AM

On smokie55's panel conversion we had trouble as well on his NP208/700r4 conversion since the guy before welded some angle iron under the cab where the shifter on the TC would move into 4H it would block it. I doubt this is the case but have someone shift the TC while looking underneath for any kind of bind.

*mike reeh* · 12-16-2002, 09:08 PM

this is likely a NP203 specific problem because the linkage is very cumbersome. If you have ever seen it, its a mess of bars and pivot points, etc...

its also not very easy to get at but I do have the adjustment manual SOMEWHERE so let me know if you need it. My np203 in my 77 K10 was the same way, it was very hard to get into 4 lo-loc.. you had to put all your weight into it..

the first thing I would do if I were you is WD-40 the HELL out of the linkage.. then work it for a while.. this wont be a permanent fix or lubricant but it will help unmask the problem..

of course there is the possibility of it being something internal but I bet not

mike

79Silv4x4 · 12-16-2002, 10:23 PM

post this or search for this topic on coloradok5.com--those guys know all about this.

coastal · 12-18-2002, 10:17 PM

thanks mike, i"ll wd40 the hell out of it and see what happnes!

hrc200x · 12-19-2002, 05:09 PM

I also had the same problem with my 203. I had my cab off so taking apart the whole linkage assembly was a snap, shifts really nice now. If you could take it apart and clean it and then grease everything that would probably be better than just squirting it with WD40. But dissasembly might be impossible with the cab on or without dropping the tranny and t-case.

coastal · 12-20-2002, 08:32 AM

thanks, What if I used brake cleaner to clean out the linkage the best I could , then grease it good. Do you think I would damage any parts with the brake cleaner?

12-15-2002, 11:31 PM	#1
coastal Registered User Join Date: Dec 2002 Posts: 5	transfer case problems I have a NP203 tranfer case with th350 auto/trans. that is very difficult to shift into 4hi. It will shift into 4low no problem, checked the fluid and its full. any ideas?

12-16-2002, 03:14 AM	#3
chevychic Registered User Join Date: Oct 2002 Location: Chanhassen, MN Posts: 1,061	I'm so glad you asked this question! I'm kinda having the same problem. Except I can get into 4hi just fine. It's 4lo I'm having troubles with. Tried to go out and play in the mud today for the first time this winter and couldn't get it into 4lo. But I still had fun in 4hi I'll be watching this thread to find out what kind of replies you get. __________________ *ChevyChic* 86 Chevy K-10 If I can't be a good example, then I'll just have to be a horrible warning. "You're braver than you believe, and stronger than you seem, and smarter than you think" - Christopher Robin

12-16-2002, 05:24 AM	#4
79BIG10 I'm back with 2nd truck! Join Date: Feb 2002 Location: Texas Posts: 3,774	On smokie55's panel conversion we had trouble as well on his NP208/700r4 conversion since the guy before welded some angle iron under the cab where the shifter on the TC would move into 4H it would block it. I doubt this is the case but have someone shift the TC while looking underneath for any kind of bind. __________________ 1979 Chevrolet Bonanza Big10 "Tootsie Roll" 1985 Chevrolet Silverado (wife's) Member of the Southern Bowties Club "Don't underestimate how sexy a fat man who drinks to excess can be." Homer Simpson

12-16-2002, 10:23 PM	#6
79Silv4x4 Workaholic Join Date: Oct 2002 Location: Katy, TX Posts: 1,589	post this or search for this topic on coloradok5.com--those guys know all about this. __________________ 1979 K-10 Silverado (work in progress) 1991 V1500 Subruban 1999 Suburban LT 4x4 2006 Suburban LTZ (daily driver)

12-19-2002, 05:09 PM	#8
hrc200x Registered User Join Date: Sep 2002 Location: Minnesota Posts: 203	I also had the same problem with my 203. I had my cab off so taking apart the whole linkage assembly was a snap, shifts really nice now. If you could take it apart and clean it and then grease everything that would probably be better than just squirting it with WD40. But dissasembly might be impossible with the cab on or without dropping the tranny and t-case. __________________ '75 Chevy 3/4 4x4, 6" suspension lift, 3" body lift, 3" lifted gas tanks, '83 cab, '88 clip, 35" cooper tires, American Racing Baja rims, 350, 700r4, 208.

12-16-2002, 03:01 AM	#2
mike reeh 5 day ban, learn to behave. Join Date: Nov 2002 Location: san diego, ca Posts: 683	probably linkage mike

12-16-2002, 09:08 PM	#5
mike reeh 5 day ban, learn to behave. Join Date: Nov 2002 Location: san diego, ca Posts: 683	this is likely a NP203 specific problem because the linkage is very cumbersome. If you have ever seen it, its a mess of bars and pivot points, etc... its also not very easy to get at but I do have the adjustment manual SOMEWHERE so let me know if you need it. My np203 in my 77 K10 was the same way, it was very hard to get into 4 lo-loc.. you had to put all your weight into it.. the first thing I would do if I were you is WD-40 the HELL out of the linkage.. then work it for a while.. this wont be a permanent fix or lubricant but it will help unmask the problem.. of course there is the possibility of it being something internal but I bet not mike

12-18-2002, 10:17 PM	#7
coastal Registered User Join Date: Dec 2002 Posts: 5	thanks mike, i"ll wd40 the hell out of it and see what happnes!

12-20-2002, 08:32 AM	#9
coastal Registered User Join Date: Dec 2002 Posts: 5	thanks, What if I used brake cleaner to clean out the linkage the best I could , then grease it good. Do you think I would damage any parts with the brake cleaner?

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