Can't get into 4Lo NP203 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Stano · 09-24-2003, 10:38 PM

Ok the subject line says it all. I built me a 83 1/2 ton 4x4 and i can't get my transfer case into 4 Lo. It is a NP203 with a TH350 infront of it. I can get 4 Hi,2Hi,N,2Lo but not into 4 Lo which sucks because I plan on USING this truck and Low range is a must. Is this a problem with the TC or ME? LOL I have tried several times to no avail. The pattern is like this:

Dash
4Lo
2Lo
N
2Hi
4Hi

Any advice is much appreciated, thanks.
Stano

jeffspower · 09-24-2003, 11:20 PM

The problem is most likely in the 203's shifter "box", the part that the shift lever comes out of. They are notorious junk, & usually not worth your time to try & fix. They are pretty much like a 3-spd column shifter, cleaning, oiling & adjusting might help- but only for a little while. GM discontinued new assemblies & parts years ago, & I don't think the aftermarket makes anything either. There are companies that make "twin stick" conversions.

Stano · 09-24-2003, 11:25 PM

Thanks Jeffspower. The action is nice and smooth actually and not sloppy. It works well otherwise just stops at 2 Lo. Like 4Lo isn't there at all. The transfer is a 79 model if that is of any help. I will mess with it and see what I can get it to do. Thanks

jeffspower · 09-24-2003, 11:43 PM

You might unhook the rods from the t-case levers (the two that are on a shaft sticking out of the t-case) & move them thru their positions to see if they are all there. One lever will have 3 positions, high, neutral, low- & the other will have 2 positions, 2wd & 4wd. You have to pry on them a little to get them thru their detents, wheels blocked & trans in neutral will help. Rocking the rear driveshaft will help too.

If you get all positions this way, then you know its in that dam POS box.

stan79chevy · 09-25-2003, 09:48 AM

check to see if your shift lever is bent or binding on something. take the lever off and shift it by hand or wiht a screwdriver

09-24-2003, 10:38 PM	#1
Stano Registered User Join Date: Jul 2000 Location: Mo Posts: 963	Can't get into 4Lo NP203 Ok the subject line says it all. I built me a 83 1/2 ton 4x4 and i can't get my transfer case into 4 Lo. It is a NP203 with a TH350 infront of it. I can get 4 Hi,2Hi,N,2Lo but not into 4 Lo which sucks because I plan on USING this truck and Low range is a must. Is this a problem with the TC or ME? LOL I have tried several times to no avail. The pattern is like this: Dash 4Lo 2Lo N 2Hi 4Hi Any advice is much appreciated, thanks. Stano __________________ New daily driver 96 Chevy K3500 crew cab dually 53,000 miles 350 Vortec 4L80 Nice ride 67 Chevy C-10 LWB Built 350 TH-400 Wifes ride and family rig: 2001 Furd Expedition 5.4 Liter Kickin back in Rolla,Mo. USA "Do the thing you fear most and the death of fear is certain" Mark Twain

09-25-2003, 09:48 AM	#5
stan79chevy Registered User Join Date: Sep 2003 Location: COVINGTON GEORGIA Posts: 477	check to see if lever is bent check to see if your shift lever is bent or binding on something. take the lever off and shift it by hand or wiht a screwdriver

09-24-2003, 11:20 PM	#2
jeffspower Well, Whoop-dee-do! Join Date: Mar 2003 Location: Easton, Mo. pop.- me & scarcely a few others Posts: 2,302	The problem is most likely in the 203's shifter "box", the part that the shift lever comes out of. They are notorious junk, & usually not worth your time to try & fix. They are pretty much like a 3-spd column shifter, cleaning, oiling & adjusting might help- but only for a little while. GM discontinued new assemblies & parts years ago, & I don't think the aftermarket makes anything either. There are companies that make "twin stick" conversions.

09-24-2003, 11:25 PM	#3
Stano Registered User Join Date: Jul 2000 Location: Mo Posts: 963	Thanks Jeffspower. The action is nice and smooth actually and not sloppy. It works well otherwise just stops at 2 Lo. Like 4Lo isn't there at all. The transfer is a 79 model if that is of any help. I will mess with it and see what I can get it to do. Thanks

09-24-2003, 11:43 PM	#4
jeffspower Well, Whoop-dee-do! Join Date: Mar 2003 Location: Easton, Mo. pop.- me & scarcely a few others Posts: 2,302	You might unhook the rods from the t-case levers (the two that are on a shaft sticking out of the t-case) & move them thru their positions to see if they are all there. One lever will have 3 positions, high, neutral, low- & the other will have 2 positions, 2wd & 4wd. You have to pry on them a little to get them thru their detents, wheels blocked & trans in neutral will help. Rocking the rear driveshaft will help too. If you get all positions this way, then you know its in that dam POS box.



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