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Low mile CUCV oil changes and maintenance advice.

M

Metaldoctor

New member
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Plain City, Utah
Brand new to this website and got turned to it by a friend who has a M1008. I am picking up a M1031 here in a couple days and looking for advice pertaining the oils and coolant. It’s an 86 all original (besides the add ons the forest service put on it after the army was through with it). The odometer reads 12,726 miles. I am guessing these are true miles because the door panels and seat as well as the rubber floor looks next to brand spanking new and there is no wear on the steering wheel or gas and brake pedals. What type of oils do you guys use with the transmission, transfer case, and front and rear axel? Really not sure what to use on the front axel because of the Trac Lok. Any advice/tricks with all the fluid changes? I would love to keep this thing on the road for many many more miles. Thanks!
 
Barrman

Barrman

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Welcome to the green iron disease party!

At the top of the page there is a tab ”TM”. Click it and find the section on Technical Manuals for the Chevy CUCV trucks. Print them, download them or just look at them.

The one ending in -10 is like a civilian owners manual. It also talks about fluids.

The one ending in -12 is the actual lubrication manual.

-20 is a light version of a civilian workshop manual. It has an amazing 70 plus pages of troubleshooting. The -20 should be the first thing you look at when there is a problem.

-34 tells you how to take the entire truck down to its smallest part, inspect and put it back together.

-34P is exploded views of everything on the truck. The part numbers listed in the -34P are Delco part numbers. Search them and you will find your part for sale. If it is still available.

The technical manuals are a great resource in other words. Basically, you bought a 1984 K30 with a J code 6.2 diesel engine. At least that is what you tell people when you are looking for parts.

Any diesel grade 10W-40 or 15W-40 oil is what your engine needs. I run synthetic because my oil will time out before it mileages out on most of my trucks. I am comfortable with synthetic oil sitting for more than a year in the oil pan. That previous sentence will probably start an argument. But, that is my theory of operation. You can do as you wish.

The TH400 gets the highest number Dextron transmission fluid that isn’t synthetic. I think that is Dextron 6, but they seem to keep changing what number is what so I could be wrong. The NP208 transfer case gets what the transmission has.
 
Mullaney

Mullaney

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Metaldoctor said:
Brand new to this website and got turned to it by a friend who has a M1008. I am picking up a M1031 here in a couple days and looking for advice pertaining the oils and coolant. It’s an 86 all original (besides the add ons the forest service put on it after the army was through with it). The odometer reads 12,726 miles. I am guessing these are true miles because the door panels and seat as well as the rubber floor looks next to brand spanking new and there is no wear on the steering wheel or gas and brake pedals. What type of oils do you guys use with the transmission, transfer case, and front and rear axel? Really not sure what to use on the front axel because of the Trac Lok. Any advice/tricks with all the fluid changes? I would love to keep this thing on the road for many many more miles. Thanks!
Click to expand...
.
Greetings and Welcome to the Outfit!

The LO (Lube Order) is available. Just click the link below:

@Barrman listed a description of the other manuals.
 
M

Metaldoctor

New member
6
4
3
Location
Plain City, Utah
Barrman said:
Welcome to the green iron disease party!

At the top of the page there is a tab ”TM”. Click it and find the section on Technical Manuals for the Chevy CUCV trucks. Print them, download them or just look at them.

The one ending in -10 is like a civilian owners manual. It also talks about fluids.

The one ending in -12 is the actual lubrication manual.

-20 is a light version of a civilian workshop manual. It has an amazing 70 plus pages of troubleshooting. The -20 should be the first thing you look at when there is a problem.

-34 tells you how to take the entire truck down to its smallest part, inspect and put it back together.

-34P is exploded views of everything on the truck. The part numbers listed in the -34P are Delco part numbers. Search them and you will find your part for sale. If it is still available.

The technical manuals are a great resource in other words. Basically, you bought a 1984 K30 with a J code 6.2 diesel engine. At least that is what you tell people when you are looking for parts.

Any diesel grade 10W-40 or 15W-40 oil is what your engine needs. I run synthetic because my oil will time out before it mileages out on most of my trucks. I am comfortable with synthetic oil sitting for more than a year in the oil pan. That previous sentence will probably start an argument. But, that is my theory of operation. You can do as you wish.

The TH400 gets the highest number Dextron transmission fluid that isn’t synthetic. I think that is Dextron 6, but they seem to keep changing what number is what so I could be wrong. The NP208 transfer case gets what the transmission has.
Click to expand...
Thanks! I’ll for sure give it a look. I’m sure I’ll end up printing it out. I like being able to refer to an actual paperback manual than dealing with the phone haha.
 
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