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Does the vaccum valve change with a change in rpm? I am having trouble finding a new vaccum valve, and was thiniking about putting an easily adjustable ball valve of some sort in its place so I could quickly adjust the shifting characteristics for the job I am doing. Just a thought.

My M1028 dually is making hard shifts at about 25 mph under light throttle from 1st to 2nd. I can get it to shift earlier if I shift the gear selector from drive to neutral and let off the throttle and then shift back into drive. Transmission fluid is full by reading the dipstick when the...

Thanks for all the suggestions. I did not realize how sensitive these engines are to air in the fuel lines. I am assuming every line was dry after I replaced the lift pump and the fuel filter. That must be a large volume for the lift pump to fill compared to what it pumps with each stroke. I...

Finally got it running. I guess there was just air in the lines. I took the fuel line off the return valve on the IP, opened the bleeder screw on the filter housing, and pressured up the fuel lines with an air compressor until fuel ran out of the vent in the filter housing. Started up fine...

Just installed a new lift pump and I am still not getting fuel to come through the line going to the fuel filter from the lift pump. I can hook up the inlet and outlet line from the fuel filter, take the bleeder plug out of the filter housing, and fill the filter with a bottle of diesel and the...

So I guess a good set of free flowing mufflers would be better than just straight pipes.

Would a straight pipe exhaust help the performance of the 6.2 or would it hurt it due to a loss of backpressure. I've always heard naturally aspirited gas engines need some back pressure on the exhaust side. What about a N/A diesel?

It was a burned out bulb on the gen 1 light. Replaced the bulb, and now both alternators charging at 14.8. Thanks a bunch Ken_86gt. I would have never figured that out.

Is Gen 1 on the driver side and Gen 2 on the passenger side?

Only the Gen 2 light comes on when key is in the on position.

Neither generator light is on in the cab.

My passenger side alternator is charging at 14.8 and the driver side is charging at 12.8. Also, the in cab voltmeter is staying right at the line between yellow and green. Usually it stays right in the middle of the green. I was wondering if the driver side alternator has a problem. I...

I have the same type of circulating heater, but have not installed it yet. How did you install it?

I just purchased a 1986 M1028A2/A3 dually. I have read that some of these had 4.88 gears instead of the usual 4.56 gears. Just wondering if anyone could help me with this question.