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#1191804 Mon Nov 21 2016 08:26 AM
Joined: Nov 2016
Posts: 3
New Guy
Hey guys,

Last year I was touring the Southwest of England and came across an American Made Yellow Truck and Coach Engine. I would imagine it was used in the war effort somehow.

Ddoes anyone know what model/year it is? What would it look like when it was new? What do you think it came out of?

Last edited by Tiny; Mon Nov 21 2016 02:08 PM. Reason: fixed link
Joined: Feb 2004
Posts: 26,955
Kettle Custodian (pot stirrer)
Since Yellow Coach was a General Motors brand, that one is probably one of the GMC truck engines. A lot of 270's were used in military rigs during WW II, but the smaller displacement engines like the 228 and 248 look the same. The general shape of the valve cover and bellhousing also suggest "GMC". The stamped number on a machined pad behind the distributor would have begun with the engine displacement- - -"228/248/270" etc. The larger GMC engines like the 426 and 503 have the carb and exhaust on the other side.

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Joined: Apr 2010
Posts: 413
That is a GMC engine. Displacement should be stamped on the distributor pad.

Last edited by 68ironhead; Mon Nov 21 2016 05:29 PM. Reason: two minutes too late
Joined: Apr 2005
Posts: 2,066
The weird part is the "Transmission". It almost looks like something out of a boat.

1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes
1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes
2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans
1947 Willys CJ2A w/F-Head engine
Joined: May 2006
Posts: 8,490
Master Gabster
Originally Posted by rfs56trk
The weird part is the "Transmission". It almost looks like something out of a boat.
That's exactly what I was thinking.

Bill Burmeister
Joined: Nov 2016
Posts: 3
New Guy
That would make sense that it came out of a boat. I found it in Brixham, which is right on the English Channel!

Joined: Sep 2008
Posts: 882
Shop Shark
That's definitely a GMC engine 99% positive if came out of an early war truck, the updated when rebuilt. Early trucks would not have PCV from the factory, but they were retrofitted during service.

You can see the adapter ring bolted to the bellhousing... its not the Clark 5speed that came with the truck.

Joined: Jun 2011
Posts: 4,976
Governor indicates probably 1.5 ton truck or larger, originally, before trans change. DUKW would have had normal trans driving, probably 270.


'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
Joined: Nov 2016
Posts: 3
New Guy
So is this what it looked like originally then? (scroll down a bit)

Detroit History

IS there anywhere I can download the original owner's manual for the GMC 270?

Joined: Nov 2005
Posts: 6,150
3B Offline
Hy thepooch, thank you very much for posting the Detroit History link, great information there!

Moderated by  Phak1, Woogeroo 

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