Usaf 1970 wm-80

[SgtSnuffy]

Hello,

My name is John and I am new to the club. I recently picked up a retired military truck, it was a USAF POL fuel truck that a farmer removed the tank from.

It has the 478M with Allison automatic and air brakes on all axles.



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The only problem with the truck I have found so far is a melted piston. I'm not sure where or how I will get a replacement. All of the custom piston makers I called said no as soon as I specified "5.125 inch"



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I hope to save the engine if at all possible, my long term plan is to build a roll-back for it. Would make a nice hauler for taking my tractors to shows.

Thanks for looking!

[FetchMeAPepsi]

Holy cow that truck is "yoooge!" BBv6 said these companies make the pistons. The thread is here


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Try searching for "pistons" and just look at the fixes other people have used too. You might get a hit or a clue as to where else might have some.

[SgtSnuffy]

LOL, yeah she is a hoss! Thanks for the info I will check it out!

[Funky61]

Welcome SgtSnuffy to the forum!

Thanks for the photos of your GMC 8000 and that scorched piston!


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[GMCv6inND]

Yeah, welcome to the club - and you’re only about 30 miles. I had a cab over a little while back, but not w a 478. And it’s an USAF truck too - pretty cool. I worked in vehicle maintenance for USAF at the base but never saw those fuel trucks, just the old Dodges. We did have the old missile erectors or TE tractors, like sits outside of the base, while I was at the base. Wish I would have gotten all the old manuals or parts they had

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Now, we’ll have to find you a piston!

[SgtSnuffy]

Thanks! Sometimes wish I had been in back in those days, all our trucks from my time are kind of boring.

Would anyone happen to know what model Allison this is? This is the only tag I can find on it and those numbers return zero results in google. It is a six speed with SAE 2 bellhousing and external parking brake on the output shaft. I will grab an over all shot of it tomorrow.



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[Funky61]

I tried putting that serial number into this site in various forms and it returned nothing, but it states you can give them a call.



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[SgtSnuffy]

Thanks again for your help! I will give them a call.

[SgtSnuffy]

The plot thickens... Below is the reply from Allison.

John,

Based on the vintage of this transmission, I believe you will need to speak with All Marine Gears. This product was sold to them, so they should have the information that you*are looking for. I have attached the contact information below. Have a great day!

All Marine Gears Contact: Acadian Marine Transmission Inc
106-G Kol Drive
Broussard, LA 70518
337-837-3636

[Funky61]

and another door opens to...another door. This is exciting.

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