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Well, that is a loaded question. If the light come on it means the shaft has moved. It doesn’t’t mean 4x4 is engaged. Your linkage to the shaft could be out of adjustment to get 4x4 all the way engaged. Or, the little plastic pads on the shift forks could be worn or totally missing. Either will...

Sorry for the short reply last night. I was tired and just did the basics. I think you have the aluminum NP208. You didn’t state though. The NP208 has a single shift shaft that changes front axle engagement first and then neutral and finally low range. The sensor for the light has a spring...

The sender for the light is on a shift rail inside the transfer case. Which means the light comes on if the shift rail has been moved. Nothing to do with the front axle.

The vent in the filler neck is a 1 inch hose. It can be removed by crawling under the truck behind the rear tire. Since the hose is close to 40 years old. I would suggest looking at it, figuring out how much new hose get, get it and then cut off the old stuff. LMC has all of this hose. There...

A stock CUCV has no wire in the tailgate. Someone added them and our guess is as good as your about what they do or where they go.

Your injectors in the picture look nice and dry. No leaks there. Just the normal valve cover seep.

Are you talking about the injector line clamp that bolts to the bracket on the valve cover?

I have never taken a micrometer to the frames. But, there is always an online argument it seems about how a 3/4 ton frame is just a hair thicker than a 1/2 ton frame with the 1 ton frame being even thicker yet. Since you have both there together. Look at the frame ends and try to see if they...

I have to write this. When I saw your location all I could think of is driving south on I-75 and that climb once you cross the river. There is a similar grade and distance climb in Oklahoma. I was down to 12 mph on the interstate, wide open throttle, black smoke billowing and actually proud of...

Black smoke means too much fuel. Or, not enough air. How is your air filter? Snap-On makes a special injector socket for the 6.2/6.5. A 32 mm open end will work sometimes. The injector lines seal to the injectors or the injection pump with a very fine tolerance fit. A single spec of dirt will...

I know you wrote that you are still getting air. However, my thought process went to brake shoe minor and major adjustment because you changed out the wheel cylinders. Your description of a low firm pedal the first push, then higher and finally firm and high to me read like the air is out and...

When you switch between hi and low do you get a crisp click or more a stirring butter into oatmeal sensation? It is very easy to test. 3 wires, headlight power in, to the high beams and to the low beams. Jumping from the hot wire with the light switch on to either of the others is fine. That...

How does your key turning action feel? Sometimes they get gummed up and hold the starter on just an instant after you let go. The fast starting is something your muscle memory gets used to.

You mean #7? https://www.lmctruck.com/1973-91-chevy-gmc/csb-1983-88-chrome-grille-molding-kits

If you don’t want to drop the transmission and transfer case. People have had success putting 6 inch long bolts or studs in place of the bottom 4 transmission to engine bolts. Then just slide the transmission back on the studs. You still have to drop both drive shafts, undo the shifters and...

The radiator fit in the truck perfect. I am running AN hoses for my transmission cooling. The adaptors I used on the stock radiator screwed right into the aluminum unit. I have a separate engine oil cooler in front of the radiator and don't use the in radiator one so I have no idea on that...

Yes it did lower my 70 mph 90° outside air temperature engine coolant temperature with the a/c running from 206°-208° to 201°-203°. That doesn't seem like much when I write it. However, since 203° is the temperature the 195° thermostat is fully open at. The 5 degree drop is really...

Bill Heath at Heath Diesel took a 6.5 truck to the Salt Flats a while ago and ran over 150. Twin turbo and all kinds of modifications. Many articles on the internet about his engine and truck build for that run. If you call the business during lunch time you will often get him answering the...

Texas state inspections do not verify the speed is accurate. Just that the speedometer works. So, if you can remove the adaptor and get a working speedometer by plugging directly into the transfer case. That problem is solved. The 1 ton truck and ambulance Chevy CUCV trucks all had 4.56:1...

Look at the HMMWV -20 manual. It has a great rebuild section for that starter. Very easy to do.