Question about 1999 GMC Suburban

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K1500 to K2500 Conversion

I'd like to convert my 2WD K1500 to a 4WD K2500 454/7.4L. How can I get a complete parts list of each to do a comparison on parts that need to be switched? I understand the engine, tranny and suspension, but what about the rest?

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The only way to do it is put your cab and box on a 4x4 chassis.
the frames are different.

Posted on Jan 03, 2009


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I have a 93 jeep Cherokee, it will move in 4wh and in 4wl but will not go back into 2wd?

Hello guy
try posting what 4wd system you have,? first.
command trac or select track, (the latter is full time)
part time or the full time system,
we cant guess it....
read the operators guide first, if a part time system only
as i suspect, stop driving on dry pavement.
it's only for ice, or dirt. part time. part time is not a full time system.
shifting to 4wd on dry (means no ice) pavement causes, drive line wind up! and the gears to lockup. (see steering get tight in turns?> and is dangerous to drive it like this , you, me and the box)
posted here 100s of times.

the non grand Cherokee. early

had these choices
  • 1987-2001: New Process NP231 Command-Trac, part-time only, 2.72:1 ratio with low range
NP231 has the following settings: 2HI, 4HI, N, 4LO
  • 1987-2001: New Process NP242 Selec-Trac, full-time or part-time, 2.72:1 ratio with low range
NP242 has the following settings: 2HI, 4 full-time, 4 part-time, N, 4LO

as you can see you need to first know, what NP box you have or
photo your shift lever for 4wd, an post it and we tell you.

more facts, on select trac. (totally unlike command trac)
Selec-Trac locking hub is used on 4WD Cherokee. Selec-Trac
utilizes a non-disconnect front axle. Engagement of 2WD or 4WD is
accomplished at transfer case by means of mechanical shift linkage.
System allows full or part time 4WD. Selec-Trac can be shifted into
2WD or 4WD modes from inside the vehicle at any speed.
next from the service manual,
1) Place mode select switch in 2WD position. Transfer case
should shift to 2WD and not allow shifting into 4WD or LO range. Axle
should shift after transfer case shifts.
2) To determine if front axle has completed a shift out of
4WD into 2WD, position mode select switch back to 4WD position while
operating vehicle at slow speed. If vehicle shifts into 2WD, axle will
ratchet. If shift is not completed, transfer case will shift into 4WD
and hissing sound will come from mode select switch.
end quote.

if unsure read the FSM book its free.
shows you both systems and how to diagnose it.

in the box, click Cherokee,,then click 1993, and behold.
the real deal.


May 10, 2016 | Jeep Cars & Trucks

1 Answer

1990 k1500 I from 4wd to 2wd the front axle stay's locked in. I have to take the actuator out wiggle the "pin" inside the differential to unlock it.

the pin may be locked in because of torque wind up from driving on hard surface in 4wd . Check power/ vacuum to actuator as well. Run on grass / mud/gravel/ ice surface as you try to unlock 4wd to allow the torque wind up to disappear.

Feb 14, 2014 | 1990 Chevrolet K1500

1 Answer


The best way to put it in 4WD is to stop the truck, put it in Neutral, then shift into 4WD. Then when you take it out of 4WD, stop the truck put it in Neutral and shift to 2WD, then back up in reverse for about 20 feet.

Jan 11, 2011 | 1995 Chevrolet K1500

1 Answer

My 1997 K1500 4wd Chevy Silverado won't move.

Do you have the tranfer case in gear?

Dec 17, 2009 | 1997 Chevrolet K1500

1 Answer

4x4 is there any kits out there

It can be done, but usually it ends up with an ad in the local newspaper about 24 months after the project is initiated....

" 19XX Yugo (or any other brand) -- Started life out as 2WD -- converted to 4WD. 90% complete. $18,000 invested, will sell for $2,200. Hurry, won't last".

The list of parts is endless, the technical skills are demanding, the shop and machining requirements are expensive. Lastly, you will likely find that 6 months into the project someone else wants to use the garage to park in...

If you truly want a 4WD vehicle, just buy one. It is tough enough keeping one running right that was 4wd to begin with, much less one that has been 'converted'.

good luck

May 16, 2009 | 2006 Dodge Ram 1500

1 Answer

4wd not engaging

Is it a two wire actuator or a three wire actuator? The two wire ones are pretty unreliable. that is why Chevrolet converter them to the three wire. Check for power and ground on the two wire in 4wd. For the three is should have one ground wire, one wire that is hot in 4wd, and one wire that is hot in 2wd.

Jan 29, 2009 | 1995 Chevrolet K1500

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