The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > General Truck Forums > All 4x4 Tech & Off Roading

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 07-22-2017, 09:25 PM   #1
Bryan59EC
Registered User
 
Bryan59EC's Avatar
 
Join Date: Jan 2007
Location: San Antonio
Posts: 25
98 K1500 manual trans--no 4x4

Some time ago--two years maybe, I had to replace the transfer case on my pickup.

All was good until about 2 months ago when I needed the 4x4 it did not work.

Changed the actuator and it worked just fine----once

Fast forward to today -- again---no 4x4 engagement

Fuse good----cannot hear actuator with key on and going thru the ranges

Change TC switch---no change

plug wiring into removed switch and the actuator engages (I think)

Remove actuator plug harness to actuator key on
depress TC switch and actuator retracts----release and the actuator extends.

replace actuator----plug TC into loose switch actuator makes noise.
Start truck put into 4-lo and go out to my yard to try to climb a some sand.

Bury the truck-----the ranges seem to be working but I really have no way
of seeing if the transfer case is actually engaging the front driveshaft.

Is it possible that some shifting mechanism has broken inside the TC.

Sticking my finger inside the TC switch hole, it feels like the pawl is a bit off center----I did not think to see if it actually moved out of the way when in 4wd.

Or did something wig out in the differential---not sure.

Any ideas???
__________________
ElCamino 1959 454/5-spd
ElCamino 1966 307/5-spd-----25+mpg
Ranchero 1965 Factory 289 High Performance/4-spd
(uncle bought new)(lil Blue Rocket)

98 Cheyenne EXT cab 350/5-spd
Bryan59EC is offline   Reply With Quote
Old 07-22-2017, 11:06 PM   #2
andrewmp6
Registered User
 
Join Date: Jan 2009
Location: Louisville,Ky
Posts: 5,817
Re: 98 K1500 manual trans--no 4x4

You could pull the rear driveshaft shift it in to 4 wheel low or high and see if the truck will pull at all.Or put it on 4 jack stands and shift it in 4 wheel and see if the front wheels turn or not.
andrewmp6 is offline   Reply With Quote
Old 07-23-2017, 06:01 AM   #3
Bigdav160
Registered User
 
Bigdav160's Avatar
 
Join Date: Apr 2011
Location: Klein Texas
Posts: 3,179
Re: 98 K1500 manual trans--no 4x4

Push button or lever?
__________________
My Classics:
'72 K20 Suburban + '65 Dodge Town Wagon
'72 Corvette Roadster +'67 Corvette Roadster
'73 Z-28 Camaro
'63 Ford SWB Uni Pickup
'50 Ford Coupe
Bigdav160 is offline   Reply With Quote
Old 07-23-2017, 07:07 AM   #4
special-K
Special Order

 
special-K's Avatar
 
Join Date: Nov 2004
Location: Mt.Airy,MD
Posts: 66,899
Re: 98 K1500 manual trans--no 4x4

Looks like button switch. I guess it's possible your TC has a problem, but I suspect a connection or other. Need to wrap my head around it a while.
__________________
"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed"

'67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi...'The 67' (project)
'72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok...'The 72'
Tim

"Don't call me a redneck. I'm a rough cut country gentleman"

R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586
special-K is online now   Reply With Quote
Old 07-23-2017, 09:44 AM   #5
Bryan59EC
Registered User
 
Bryan59EC's Avatar
 
Join Date: Jan 2007
Location: San Antonio
Posts: 25
Re: 98 K1500 manual trans--no 4x4

all manual

big levers sticking out of the floor for both the trans and the transfer case.
__________________
ElCamino 1959 454/5-spd
ElCamino 1966 307/5-spd-----25+mpg
Ranchero 1965 Factory 289 High Performance/4-spd
(uncle bought new)(lil Blue Rocket)

98 Cheyenne EXT cab 350/5-spd
Bryan59EC is offline   Reply With Quote
Old 07-23-2017, 11:49 AM   #6
Ol Blue K20
Senior Member
 
Ol Blue K20's Avatar
 
Join Date: Nov 2012
Location: Fairfield, CA
Posts: 8,340
Re: 98 K1500 manual trans--no 4x4

What about the front diff actuator? I've replace mine twice. The transfer went into 4wd but the front diff didn't lock in.
__________________
"Some Days Chickens And Some Days Feathers"

Dale
Ol Blue K20 is online now   Reply With Quote
Old 07-30-2017, 03:33 PM   #7
Bryan59EC
Registered User
 
Bryan59EC's Avatar
 
Join Date: Jan 2007
Location: San Antonio
Posts: 25
Re: 98 K1500 manual trans--no 4x4

Actuator has been in there less than a month --- and it does function when I remove the switch from the TC and work it manually (actuator out of axle).

But something dawned on me just recently-----seems all the drawings I see of the TC/Acuator circuit have a relay somewhere----I have no idea where it would be or even if the manual trans/manual transfercase vehicles even have one.

No time to play with it last week or even this upcoming week as it needs to drivable to the airport (where it pretty much lives)

Should be working in my hometown after the 8th for a few days so I might get somewhere with it.

Would really like to--the brush piles need to be consolidated into a single pile for burning and I ain't about to go back there again without the 4x4 working.
__________________
ElCamino 1959 454/5-spd
ElCamino 1966 307/5-spd-----25+mpg
Ranchero 1965 Factory 289 High Performance/4-spd
(uncle bought new)(lil Blue Rocket)

98 Cheyenne EXT cab 350/5-spd
Bryan59EC is offline   Reply With Quote
Old 10-26-2018, 10:39 PM   #8
Bryan59EC
Registered User
 
Bryan59EC's Avatar
 
Join Date: Jan 2007
Location: San Antonio
Posts: 25
Re: 98 K1500 manual trans--no 4x4

UPDATE:

Lost job after 37 years
Had to put a new engine in the truck----190,000 pasture miles (it was due as oil pressure dropped to zero at idle and had been knocking for a couple of years now)

Started new job and have had little time to mess with it.

Just picked up the truck today after getting engine installed and put it up on a rack.

Removed the actuator and fired the truck up---put in 4-low and and let it idle.


Front driveshaft is turning and it is positive, not just floating with the t/c.

Floor indicator not coming on and actuator not engaged (plugged in hanging)

Insert an extension bar into the front end and the differential engages just fine.

Unplug actuator switch and plug a loose switch to the harness

Actuator starts dancing at the end of it's harness like it is trying to engage.

Plug harness back to t/c and play with wiring over the top of the t/c and the actuator starts dancing again.

This kind of tells me that there is a bad wire somewhere in the harness.

Now, I have looked for a STANDARD wiring diagram for this truck and cannot locate one anywhere.

Manual 5spd with a NP241C t/c
The only electrical connections on this t/c are for:
VSS
Differential actuator

Does anyone have an electrical diagram that will show the wiring of a BASE
5-spd 4x4----no dash switches, no dash indicators--the only indicator is a lamp on the floor shifter that lights when it is placed in either of the 4x4 positions.
This lamp has stopped working as well---was working earlier in the summer.

The only diagrams that I can find are for the trucks with the buttons on the dash and automatic transmissions---my truck has neither.

If this thing has relays or modules, I have no idea where they may be located. Still kind of anxious to get the 4x4 working, especially now that I know it is not mechanical.

The good news is that my truck no longer rattles at a light and the oil pressure is staying at 40+ all the time.
__________________
ElCamino 1959 454/5-spd
ElCamino 1966 307/5-spd-----25+mpg
Ranchero 1965 Factory 289 High Performance/4-spd
(uncle bought new)(lil Blue Rocket)

98 Cheyenne EXT cab 350/5-spd
Bryan59EC is offline   Reply With Quote
Old 10-28-2018, 07:41 PM   #9
Bryan59EC
Registered User
 
Bryan59EC's Avatar
 
Join Date: Jan 2007
Location: San Antonio
Posts: 25
Re: 98 K1500 manual trans--no 4x4

Nobody??
__________________
ElCamino 1959 454/5-spd
ElCamino 1966 307/5-spd-----25+mpg
Ranchero 1965 Factory 289 High Performance/4-spd
(uncle bought new)(lil Blue Rocket)

98 Cheyenne EXT cab 350/5-spd
Bryan59EC is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 11:40 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2018, vBulletin Solutions Inc.
Copyright 1997-2013 67-72chevytrucks.com