Allison TC-200, TC-300 1954 Parts Catalog

If you’ve ever tried to order parts for an old Allison Torqmatic converter without the factory parts catalog, you know the drill—wrong numbers, supersessions that don’t match, and back-ordered pieces that don’t fit. This 38-page original 1954 Allison TC-200, TC-300 1954 Parts Catalog takes that guesswork out of the shop. You get the exact part numbers Allison stamped on the line, not some aftermarket reprint that dropped a digit.

What the 1954 Parts Catalog Covers

This is a genuine OEM publication from Allison, not a generic compilation. The catalog includes Supplemental Parts Information (SPI) bulletins that were issued after initial printing. On page 1 you get SPI 127 dated May 17, 1954, which details a critical thrust washer replacement for all 200 Series Torqmatic Converters with serial numbers 4803 and below (except 4768). The old part numbers—CEX-7990 (rear thrust washer) and 3709044 (pump thrust washer)—are listed alongside the new replacements: 6756233 and 6756629. That kind of field-service revision is exactly what a restoration shop needs to keep a 1950s truck on the road.

Stator Thrust Washer Replacement: Factory Specs You Can Trust

Early production TC-200 units had issues with stator thrust washer wear under extended high-torque operation. The factory bulletin says both washers must be replaced if the converter is disassembled for any reason. Without this catalog, you might order the old CEX-7990 based on a worn stamping—and that part is already superseded. The manual gives you the correct new number right there. For a mechanic rebuilding a vintage fire truck or construction equipment, that saves a return trip to the parts counter.

Hydraulic Circuits and Operating Pressures (SPI 136)

SPI 136, dated August 9, 1954, covers three approved hydraulic circuits for TC-200 and TC-300 converters. The integral heat exchanger option requires an orifice in the converter “in” line—Part Number 6756658 with a 7/32-inch diameter hole for TC-200, and Part Number 6756659 with a 5/16-inch diameter hole for TC-300. For remote heat exchanger setups, a bypass valve set to open at 55 plus-or-minus 5 psi must be mounted at the converter oil “out” connection. That pressure spec is critical; if you set it wrong on a cold start, you can bulge the converter housing. The manual shows the valve location and gives exceptions for Detroit Diesel engine installations. Page 3 of the SPI includes the hose routing sketch and the exact pressure relief valve location. Do not trust aftermarket supersession lists on that detail.

Who Needs This Parts Catalog?

If you are restoring a 1954 Kenworth or Autocar that came with an Allison TC-200, or servicing a vintage oil-field pump driver with a TC-300, this catalog belongs on your workbench. It covers every threaded plug, gasket, and seal the factory listed. The 38 pages are packed with exploded-view illustrations and numerical part tables—no fluff, no filler. Home-garage enthusiasts rebuilding a Torqmatic converter on the bench will find the exact bearing and washer dimensions they need to order the right components. For a professional shop, having the OEM catalog on hand means you bill the job correctly the first time, not after three wrong parts deliveries.

3 Reasons Factory Parts Catalogs Beat Aftermarket

First, the factory catalog includes field-service bulletins like SPI 127 and SPI 136. Aftermarket reprints often omit these pages because they were issued separately after the base catalog was printed. Second, the page layout is exactly what Allison mechanics used in 1954—no re-numbering, no re-typing that introduces typos. Third, the torque converter hydraulic circuit specs (orifice sizes, bypass valve pressure settings) are only validated in the OEM document. A generic catalog will tell you “use standard heat exchanger plumbing” without the specific orifice part number. That is the difference between a converter that lives 5,000 hours and one that leaks at 500.

Using the Catalog on the Workbench

Pull a serial tag off the converter—say, S/N 4768 (one of the exceptions). The SPI 127 says that unit does not need the thrust washer update unless you find wear. Compare that to a unit at S/N 4803: it must have both washers replaced. That kind of serial-number-specific guidance is why shops like mine keep a stack of factory catalogs. Pair this with an updated service manual for torque specs when reassembling. Related manuals you might need include the Allison Torqmatic Converters 200-300 Series Parts Catalog, the Allison Torqmatic Converter Series 200-300 Parts Catalog, and the Allison Torqmatic Converter 200-300 Series Parts Catalog. For broader context on vintage powertrains, see the Automotive Industry Overview and the Internal Combustion Engine fundamentals.

Can this parts catalog be used for repair procedures?

No. This is a parts catalog, not a service manual. It lists part numbers, supersessions, and hydraulic circuit specs but does not include step-by-step overhaul instructions.

What serial numbers are covered in the thrust washer supersession?

SPI 127 lists specific unit serial numbers: 4600, 4601, 4602, 4625, 4668, 4669, 4672, 4691, 4714, 4721, 4725, 4776-4783, 4788-4792, 4799-4803. All TC-200 series converters with S/N 4803 and below except 4768.

Does the manual include hydraulic pressure specs?

Yes. SPI 136 gives operating pressure limits, orifice sizes for heat exchanger circuits, and bypass valve cracking pressure of 55 ± 5 psi. Page 3 of the SPI shows the remote heat exchanger circuit layout.

Is this the original factory printing or a reprint?

It is a direct digital reproduction of the original 1954 Allison publication, including all SPI supplements. No third-party edits, no re-typed text. Every page matches what the Allison service manager released in 1954. Aftermarket catalogs frequently omit the supplemental bulletins because they were issued as separate sheets. That omission is the difference between getting the right thrust washer number or ordering a discontinued part. The 38-page count includes every page of the base catalog plus the two SPIs. If you are serious about keeping vintage Allison torque converters operating safely, this is the only list you should rely on.

Factory parts documentation is not a luxury—it is a requirement for jobs that involve critical fluid pressures and obsolete part numbers. When you order parts for a TC-200 or TC-300, you need the numbers that Allison engineers wrote, not guesses from a parts-store database. Download the Factory Manual directly from AutoRepairManuals and keep it in your tablet or binder next to the bench. You will use it every time a serial tag has to be decoded, and you will not waste a single hour on a wrong part.