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T cases are easy to change, vins are not. He's looking for the better front differential. But then again, axles are easy to change as well.

Me personally, no. Others, maybe.

Look at the 4th charachter in the vin. If it is a G, it is an M1008 with open front dif If it's an H, it's an M1028, or M1031 With the LS front dif

What's the vin number?

Did your GPs have the original 3/16 wide connectors still, or have they been changed to standard 1/4" wide female blade terminals? Go get yourself a set of AC Delco AC60G glow plugs and new connectors(if you have original terminals still), and I bet your all set. After that, we have a few...

This is from paragraph/step 19, Step 3. Disconnect each glow plug lead and check for resistance between glow plug terminal and ground. Resistance should be 1-3 ohms. Check glow plugs for looseness or damage. If any glow plug does not have correct resistance or is damaged, replace,

They need to be 1-3 ohms. Less(as yours are) is not good.

Do you recall the readings?

Have you measured each GP for ohms?

We have the TMs for free, right here on SS.

Look at the -20P or -34P TM.

The above posts are directly out of the -20TM troubleshooting section. Please follow them and tell us if you do not solve your problem.

Resistor may be hot. Use care when performing this step or injury to personnel may occur. Step 5. Step 6. Step 7. Step 8. Disconnect batteries, pull out bracket and resistor assembly (see paragraph 4-44, REMOVAL, step 4), disconnect output (red wire) from relay, disconnect input (blue...

19. ENGINE CRANKS BUT WILL NOT START; ENGINE COLD; “WAIT” LIGHT OPERATES Step 1. Ensure that key is in “OFF” position. Check for voltage between glow plug relay terminal where orange lead connects and ground. If there IS voltage, replace glow plug relay (see paragraph 4-8) and perform step...

CRANKS BUT WILL NOT START Step 1. Check to see if there is fuel in tank. Add fuel if empty. Step 2. Check fuel supply and return lines for restrictions, looseness, or damage. Tighten or replace if damaged. (See paragraph 3-13 or 3-14) Step 3. Inspect fuel filter, fuel pump, and injector pump...

From the troubleshooting section of the -20 TM c. When troubleshooting a malfunction: (1) Ensure that both batteries are fully charged.

This is an indication that the GP controller is not sensing a drop in output voltage. Test the GPs. There is thorough test procedure for all of this in the troubleshooting section of the -20TM. I thought it was immediately proceeding the "cranks but does not start" section.

Use an ohm meter and test each gp. Your test 2 indicates your GPs are all bad. How did you determine it was not in glow cycle? Did you remove either small wire from the relay? The light off does not mean the relay is off.

He called, and I explained that W. I think he understands what needs to be done for now.

Actually, he needs a vehicle to drive back and forth to college with(not an off road truck). An M1009 that takes a bath like that occasionally needs extensive maintenance afterward, to be driven safely (or to last long) on the highway at 65mph for a few hundred miles at a time.