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If an old school indirect injection non turbo diesel is quiet while running, then something is wrong😂 Seriously, a video of the noise you are referring to would help.

Yes... and it involved custom fabrication

Probably not much of a difference on n/a diesel... especially with the low rpm's of a diesel. FWIW, from my own experience I've found that exhaust manifolds on a SBC are better on a street driven vehicle versus headers.

It's commonly referred to as a suspension lift lol

An M1009 had 15x8 wheels from the factory and used C rated tires. They're nowhere near as heavy as one of the trucks nor would they haul the weight of a truck. C rated tires will do just fine.

Had those in 235 85 16 on my 79 K20. Great tires, but if I did not air down for off road they did not bite into the ground very well.

New AC Delco 60 glow plugs and fixed the leaking line going to the inj pump on the 85 M1008. Hopefully both M1008 trucks are good to go mechanically. The only thing I really need to do soon is rebuild the bench seat in the 86 M1008 with new foam.....

Replace every thing that's rubber; tires, belts, hose, fuel lines,... I previously mentioned harmonic balancer because while the rubber may look good on the balancer, it's dried and hardened.

That's usually your credit/debit card whining while waiting on something that needs fixed on your cucv. I'm quite familiar with it😂

Sounds normal to me... and these 6.2 diesel engines are not quiet. If it was quiet, then something is wrong with the fuel delivery or it's losing compression. Have you tried changing the fuel filter to see if it runs better?

. A spin-on filter for oil or fuel is a good upgrade. On the other hand, if what you have works and doesn't leak... you might say why. . I upgraded my 85 m1008 to a Duramax fuel filter set up. I'll have to say that having the primer pump makes it worth it even if the factory unit is not...

Well said, although if the factory fuel filter housing starts leaking you will be doing a spin on filter mod... wound up having to do that on my 85 m1008

Yes

Put on a new harmonic balancer if you're keeping the 6.2 diesel...

I wound up doing the same.... my 27MT kept eating up any bendix we threw in there

The motor mount on my 86 m1008 turned out to be okay. All of the bolts holding it in place had all backed out🤣

I had a local service rebuild the column in my 85 m1008 and 79 k20..

Your existing column can be rebuilt and the linkage can be adjusted

I don't know what the number was

If I'm correct that's just the outlet for the water separator. I'll get an up close pic when it stops raining.