Author Topic: 4x4 shifting  (Read 3944 times)

Offline Dirka

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4x4 shifting
« on: October 09, 2014, 07:57:32 PM »
Just installed my TH250?NP203 back under my truck today, got everything buttoned up.
I get into truck and run the shifter, and I feel like it only "locks" into 3 different positions..
I'm still in the process of putting the rebuilt engine back in, so can't test which I have, but is there anything I could have done wrong to only have 3 positions??

Offline Captkaos

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Re: 4x4 shifting
« Reply #1 on: October 09, 2014, 08:07:30 PM »
TH250?  You mean TH350?  By 3 posistions you me it only moves in 3 slots?  Did it previously have this same trans setup?  If so pull off the linkage and work the trans lever to verify PRNDLL.

Offline Dirka

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Re: 4x4 shifting
« Reply #2 on: October 09, 2014, 08:18:04 PM »
Capt, yes 350.. I don't always go back and spell check. Guess high school didn't teach me anything  :o :o
I did check the PRNDLL I get all of those from the tranny.
I'm talking about the transfer case.

Offline FlatBlack77

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Re: 4x4 shifting
« Reply #3 on: October 09, 2014, 10:46:23 PM »
i had a similar problem when i first got my 79. it felt like it only had 3 positions and was really hard to shift.

turned out i had to put so much effort into shifting that it was skipping over 1 and even 2 positions when it would move because i was pushing so hard.

if you understood that lol

take the shifter boot off and see whats goin on. i sprayed some lube on it and havent had a problem since
"When you are a hammer, everything looks like a nail"
'77 C/10 - 350/350 mild street motor

Offline Dirka

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Re: 4x4 shifting
« Reply #4 on: October 11, 2014, 11:04:16 AM »
take the shifter boot off and see whats goin on. i sprayed some lube on it and havent had a problem since

Looks like I will put some lube on it before I put interior back in. Thanks!

Offline Jason S

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Re: 4x4 shifting
« Reply #5 on: October 11, 2014, 12:09:58 PM »
You might want to take the shifter off, take it apart and clean all the internal parts.  Cleaning out any mud, old grease and rust will help a lot with shifter operation.
1973 GMC K2500, Super Custom, Camper Special, 350, TH350, NP203, 4.10's
1974 Chevrolet K10, Custom Deluxe, 350, SM465, NP203, 3.73's

"1) Peace through strength; 2) Trust but verify; 3) Beware of evil in the modern world"

Offline Dirka

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Re: 4x4 shifting
« Reply #6 on: October 31, 2014, 04:57:12 PM »
OK another quick question.  I replaced the metal hold down piece that goes around rubber boot and it doesn't have the markings for Hi, Lo, N Lo Lock, Hi Lock.. Of course N is in the middle and I found Low was pushed forward, and HI was pulled back all the way. I haven't locked the hubs, will that give me an extra gear to put in, or will it remain just those three?

Offline Jason S

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Re: 4x4 shifting
« Reply #7 on: November 03, 2014, 10:17:56 AM »
There should be 5 positions, regardless of whether your NP203 has a part-time conversion or is still full time.

If your NP203 has a part-time conversion you gain a 2wd-lo and can run hubs in the front. With the part-time conversion, shifter all the way forward (closest to the dash) and moving backward (toward the seat):
Lo-Loc is 4wd Lo
Lo is 2wd Lo
N is still neutral
Hi is 2wd Hi
Hi-Loc is 4wd Hi
1973 GMC K2500, Super Custom, Camper Special, 350, TH350, NP203, 4.10's
1974 Chevrolet K10, Custom Deluxe, 350, SM465, NP203, 3.73's

"1) Peace through strength; 2) Trust but verify; 3) Beware of evil in the modern world"