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My 85 M1008 has a brand new 24volt 28MT. It does not turn the engine over nowhere near as fast as the 27MT direct drive. If the glow plug system is working as it should and it's getting fuel, the engine should start very quickly. My 86 M1008 has a 12 volt 28MT and it starts up within 1-2...

The rubber on the balancer may look okay, but it's 30 plus years old and it's dry and hardened. The balancer on my 85 M1008 looked fine as well, but I had it changed out to a Dorman OEM unit. It was a night and day difference. The engine idled markedly smoother and it gained some power. I...

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.

. 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...