Description

Allison TC-200, TC-300 1954 Parts Catalog

I’ve been turning wrenches since before most of you were born, and I’ve seen one too many jobs get held up because somebody ordered the wrong seal ring. If you’re working on an Allison Torqmatic converter from the TC-200 or TC-300 series and you don’t have the factory parts catalog, you’re flying blind. This is the real deal – a 57-page Allison TC-200, TC-300 1954 Parts Catalog straight from the OEM, not some aftermarket reprint that skips the revisions. You need the exact part number for a counterbore O-ring or a square-section seal? It’s in here.

This catalog covers the Torqmatic Converter Series 200 and 300 – all models built up through the mid‑1950s. It includes Service Information Letters (SILs) that document running production changes, like the switch from round-section seal ring P/N 3702082 to square-section P/N 3713622 on TC‑200 converters after serial number 6058. That kind of detail is what separates a proper rebuild from a leaky comeback.

Allison TC-200 and TC-300 Parts Breakdown

Every section of this 57-page catalog is organized by converter assembly. You get exploded views, part numbers, and quantities. The housing, pump, gear and cover assembly, heat exchanger – it’s all indexed. Need the retainer bolt P/N 9409203? It’s listed with the gasket 6753966 and seal ring 7374627 on the housing page. You won’t find “universal fit” garbage here. These are the exact numbers the factory stamped on the drawing.

One thing I appreciate: the catalog flags interchangeability. The same housing P/N 6754489 is used on both TC‑200 and TC‑300 converters, but the O‑ring 7374627 isn’t needed on the TC‑200 if you use gasket 6756872. That distinction saves you ordering parts you don’t need. The catalog tells you why, referencing Service Bulletin #25. That’s the difference between a real OEM document and a generic parts list.

What Service Bulletins Are Included?

The manual bundles four factory SILs inside the 57 pages. SIL 136 covers the remote heat exchanger with integral bypass valve – gives you minimum line sizes and flow direction for counter-flow cooling. SIL 137 documents the addition of O‑rings to the housing counterbores starting at converter serial number 5165. SIL 150 explains the switch from round to square-section seal ring on the TC‑200, including a table of affected serial numbers. SIL 157 (starts on page 5 of the PDF) addresses replacing a single-row converter pump bearing with a double-row unit. If you’re rebuilding a converter that’s been sitting for decades, those bulletins are gold.

Each bulletin is dated and signed by the Service Manager – Transmissions back when Allison was still based in Indianapolis. No guesswork. No “this might fit.” Factory engineering decisions, in writing.

57 Pages of Factory Part Numbers

Fifty-seven pages. That’s not a thick catalog, but every page is dense with data. You’ll find cross-reference lists, change notices, and notes like “It is recommended that all stock of the P/N 3702082 Seal Ring be scrapped and new P/N 3713622 Seal Ring ordered.” That’s from SIL 150. The catalog doesn’t waste space. It gives you the old part, the new part, and the reason. If you’re a DIY guy with a TC‑300 sitting in your garage, you need to know whether your converter is before or after serial number 5165 to order the right gasket set. This catalog tells you.

For professional shops – think about liability. You hand a customer a quote based on parts from an aftermarket database, you might get the wrong bearing. This catalog is your insurance. The bearing changes are documented with serial number breaks. You won’t find that info on a generic parts website.

Parts Interchangeability: What Fits What

One question I get: “Can I use a TC‑300 housing on a TC‑200?” The answer is in here. Housing P/N 6754489 fits both, but the seal package differs. The catalog clarifies that the O‑ring is not needed on the TC‑200 if you use the gasket. Interchangeability is not affected, they say. That’s the kind of practical info that keeps you from ordering duplicate parts or, worse, missing a seal and causing an oil leak. The square-section seal ring 3713622 also works across multiple models. The catalog lists the serial numbers where it was introduced – 4790, 5102, 5343, 5387, 5392, 5476, 5637, 5651. You can verify your converter’s number against that list.

If you’re looking for later models, check out Allison Torqmatic Converters 200-300 Series Parts Catalog for the 1955 update, or Allison Torqmatic Converter 200-300 Series Parts Catalog for a different version. For the 1976 TC‑200/TCA/TCRD catalog, see Allison TC 200-300 TCA TCRD 200 1976 Parts Catalog. Those are separate documents, but for the 1954‑55 converters, this is the one.

For background on how torque converters evolved, refer to Automotive Industry Overview and the principles behind Internal Combustion Engine – but for real parts data, stick with the factory catalog.

Check the O-Ring Part Numbers Before Ordering

Don’t assume a generic O‑ring will work. The counterbore O‑ring 7374627 is a specific size and durometer. The seal ring 3713622 is square section, not round. The catalog shows the exact dimension on a scaled drawing. If you order a generic O‑ring from a hardware store, it will leak. The factory spent engineering hours to eliminate a pinched seal problem – respect that. Use the parts catalog to get the correct part number, then source it from Allison or an authorized dealer.

FAQ

Does this catalog cover both TC-200 and TC-300?

Yes, it covers both series.

What is the difference between the old and new converter housing?

Starting at serial number 5165, the housing P/N 6754489 got counterbores and O‑ring 7374627 added to eight mounting holes to prevent oil leaks. The old housing had no counterbore. The catalog shows both versions with a scale drawing. For TC‑200 converters, the gasket 6756872 replaces the need for those O‑rings, so the old housing is still satisfactory if you use the correct gasket. The parts catalog spells out the interchangeability.

Are the service bulletins printed in full?

Yes, four SILs are reproduced in order: 136, 137, 150, and the beginning of 157. Each includes the date, subject, affected serial numbers, and part number changes.

How many pages does this catalog have?

57 pages total, counting covers and bulletin inserts.

You don’t need to guess which seal ring goes where. The factory did that work in 1954. Stop flipping through aftermarket catalogs that omit the revisions. Access the Factory Manual.