Manic Mechanic

My 1953 A-54 grill shell had an emblem that was larger than the B model. My original was 18.5" wide and 2" tall and the screw holes were 11" apart. The emblem I just bought from e-bay for a B-model is smaller at 15.5" wide and 2" tall with the screw holes at 7.375" apart. I plan on welding the original holes and drilling new ones for the B model emblem or the holes might be covered with the new emblem. Jeff

Thanks, Greg,Mike and Rob, I'll have to get a copy of Wheels of Time and look up Mr. Chalmers. What part of Pennsylvania does he reside? I'm traveling back to PA next week for the Street Rod Nationals in York, PA. My uncle and I drive from Pittsburgh to York and cover a good portiion of the state. Jeff

Does anyone know where to find a new windshield gasket for my A model? Thanks, Jeff.

Thanks, Rob and Joe for your help. Jeff

You are correct in your assumption. There is a conventional duplex in your truck if it has two shifters. It is probably a TRD-67X series being gasoline powered. This is a smaller variant.

Rob

Rob, didn't the mono-shift/uni-shift tranny have just one stick? This particular A-54 has a two sticks and the shift pattern printed above the windshield shows a 5 speed pattern on the left and a 2 speed pattern on the right. Thanks, Jeff

No confusion at all Rob, I figured the "D" in the nomenclature was for diesel but being new to this forum I wasn't sure. So, is this monoshift tranny any good? Is it shifted like the duplex/triplex/quadraplex? Since I'm not going to be hauling significant weight around, I'm not going to need a 9.30:1 first gear at all. As for the other 4 speeds, couldn't I just leave the splitter in HI and just shift it like a 4 speed or would it be best to use it to split each gear 2nd/Low then 2nd/HI and so on? Thanks, Jeff

No confusion at all Rob, I figured the "D" in the nomenclature was for diesel but being new to this forum I wasn't sure. So, is this monoshift tranny any good? Is it shifted like the duplex/triplex/quadraplex? Since I'm not going to be hauling significant weight around, I'm not going to need a 9.30:1 first gear at all. As for the other 4 speeds, couldn't I just leave the splitter in HI and just shift it like a 4 speed or would it be best to use it to split each gear 2nd/Low then 2nd/HI and so on? Thanks, Jeff

Hi there, the engine you probably is not an END 510 as I stated earlier. The D would mean diesel and the mistake was mine. The Mack designation for a gasoline engine was EN 510 without the D in the nomenclature. Also the transmission used behind a gasoline engine was indeed a "Monoshift", where the same transmission behind a diesel engine was a "Unishift" but they are one in the same that I've seen.

Sorry for the confusion.

Rob

Thanks for the info Joe, so the tranny is called a 10 speed mono-shift. How do you like driving with this tranny? I would imagine they are similar to the duplex/triplex/quadraplex tranny's. I'm considering re-powering this truck with cummins 5.9 that I already have not only for the scarcity of parts for the END510 gas engine, but also there are flywheel covers available to connect the cummins 5.9 to the SAE#2 bell/clutch housing on the 10 speed mono-shift tranny. From what I've read the diesels used a SAE#1 flywheel cover. However, I imagine the ratios are the same between the gas and diesel versions of this tranny. If I go ahead with the engine swap planned, I would be glad to help anyone needing parts for there A model.

Jeff I have a A-51T it has the Mack 510 Diesel certainly hard to find parts for the 510 Dieasel. On your question of the 10 speed mono-shift the one in my A-51T. It has an overdrive ratio of 0.79 and a first gear of9.30 according to a sales brochure. Joe D.

Thanks for the info Rob, Were these 5 speeds with the Hi/low splitter an overdrive trans? If so, what were the OD ratios? Thanks, Jeff

A54S means it was built as a gasoline powered tandem chassis. The 1854 is just the last part of the serial number of that chassis and has nothing to do with the series of truck. If the truck had been built as a tandem tractor it could be A54ST1854. I assume the engine is an END510 witch was common in that series and damned near extinct for parts. I am under the impression the A series of trucks were produced in the 1950, 1951, 1952, and 1953 model years. If yours is in fact a 1954, it is probably a carryover from earlier production.

As you asked, it should have the SAE #2 bellhousing but will not use the later standard pad mounting on the side but rather mounts via "ears" to the frame adapters.

Rob

Hello, I'm a new guy to this forum and I'm considering buying an A model that has the chassis #A54S 1854. I didn't get the engine # yet but it's an overhead valve gas mack six cyl. The transmission is a Mack 5 speed with a High/Low splitter. The seller says it's a 1954 year A model which I assume corresponds to the last two digits in the chassis #. I was wondering if anyone knows if the transmission in these trucks was of the smaller flywheel/bellhousing SAE# 2 bellhousing pattern. Any help would be greatly appriciated. Thanks, Jeff.