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Q: 92 k2500 5.7 4x4 wants to know if this will fit? Amazon filter says no but switch and harness fit? hum..?

This is an upgrade unit for the old style thermal actuator. This should work on your truck, but you have to use the Dorman 600-600 upgrade harness, which includes a spacer which goes into the axle for proper operation. I installed this actuator and the upgrade harness kit on my 93 Silverado K1500 5.7 in about one and a half hours. The hardest part was routing the extra hot wire from the new harness back up to the 4X4 shifter. I spliced into the hot wire going to the shifter so the actuator stays engaged with the ignition switch off. If you run the new hot wire on upgrade harness directly to the battery the actuator will disengage/engage every time you turn the ignition off/on while in 4 wheel drive. My front axle now engages as soon as I move the shifter, no waiting like the old thermal unit and cold weather does not affect it.

Q: My 92 k1500 has the shifter in the floor for 4x4 and when i put it in4 low or high the front drive shaft on the column doesnt light up would this fix?

Did you get it fixed? I would suspect either the lamp burned out like in my 94 Suburban with the NP243. My NP243 also has 2 switches, one for the actuator, the other for the "4x4" light (which I believe is a "194" bulb) under the little diagram on the cover when I engage the floor lever. Also check ACDelco "PT724" (GM Original Equipment 2-Way Male Gray Multi-Purpose Pigtail) if your plug is bad.

Q: My 96 k1500 takes awhile to ingage. Would this fix it

It will fix it but along with that you need a wiring harness to change over from Chevrolet you have to get it from Chevrolet

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🚙 Upgrade your 4WD game with confidence — don’t get left behind!

SEAMLESS OE FIT - Direct replacement engineered to match original specs for hassle-free installation.
PRECISION VERIFIED - Use the garage tool to confirm perfect fitment for your specific vehicle model and year.
CUSTOMIZABLE FINISH - Exterior ready to paint, allowing you to maintain your vehicle’s aesthetic integrity.
RELIABLE 4 WD REVIVAL - Effectively fixes inoperative four-wheel drive systems, getting you back on the road with confidence.
CENTURY STRONG LEGACY - Backed by over 100 years of trusted Dorman automotive innovation and expertise.

The Dorman 600-101 4WD Actuator is a precision-engineered direct replacement part designed to restore full four-wheel drive functionality on select vehicle models. Weighing just 9.6 ounces and measuring 3.3 x 3.3 x 7.6 inches, this US-designed actuator ensures reliable performance backed by over a century of Dorman’s automotive expertise. Easy to verify fitment and ready-to-paint exterior make it the smart choice for professional-grade repairs.

Specifications

Manufacturer	Dorman Products
Brand	Dorman
Model	4WD ACTUATOR
Item Weight	9.6 ounces
Product Dimensions	3.3 x 3.3 x 7.6 inches
Item model number	600-101
Is Discontinued By Manufacturer	No
Exterior	Ready To Paint If Needed
Manufacturer Part Number	600-101
OEM Part Number	742D421A; 7F2000; 7F2001; 83-115A; A482421; FWD14; FWD32; TCA-19; TCA-20; TCA-22; 26060073; 8-26060-073-0
Position	Center

Have a Question? See What Others Asked

92 k2500 5.7 4x4 wants to know if this will fit? Amazon filter says no but switch and harness fit? hum..?

Have a 05 gmc 1500 slt. 2wd dont work. will this fix the problem? or will it fit?

My 92 k1500 has the shifter in the floor for 4x4 and when i put it in4 low or high the front drive shaft on the column doesnt light up would this fix?

My 96 k1500 takes awhile to ingage. Would this fix it

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