Description

Allison 200 Series, 300 Series, TC-200 1957 Parts Catalog

I’ve been turning wrenches since before most of you were born, and I’ve seen more transmission rebuilds than I’ve eaten breakfast tacos. One thing that’ll kill a job faster than a stripped T40 bolt is using the wrong part number. You order a stator assembly for a TC-200, get the old one, and now the converter won’t build charge pressure because the roller springs are coiled instead of convoluted. This 1957 Allison 200 Series, 300 Series, TC-200 Parts Catalog is what you need on your bench to avoid that mess. It’s 25 pages of factory-issued part numbers, supersession tables, and engineering change bulletins. No aftermarket guesswork.

What’s Inside This OEM Parts Catalog

You open this catalog and you get actual Allison engineering notices. SPI 224 shows the old and new converter pump cover assembly – complete with part numbers like P/N 6757712 for the new cover. There’s a sketch so you can eyeball the difference between a bushing P/N 6754922 and a cover assembly with bushing P/N 6755325. SPI 280 from July 1957 covers the release of an improved stator assembly for the TC-200. The table lists the new part number 6769234 and the deleted part number 6755271. Eight roller springs changed from coiled to convoluted. You get the cam part numbers, the thrust washers. This is the kind of data you need when you’re staring at a pile of old parts and wondering what fits what.

Stator Assembly Update: Why It Matters

Transmissions with converter serial number above 19439 got the new stator assembly. If you’re rebuilding a TC-200 that falls below that serial number, you can still use the old assembly – but don’t mix new and old parts. The catalog spells it out: superseded parts in spare stock may be used but not in conjunction with any of the new parts. That’s a rule plenty of guys ignore and then they’re pulling the converter again in two weeks. The complete assemblies P/N 6769234 and P/N 6755271 are interchangeable, but the individual components aren’t. Save yourself a second teardown by referencing page 2 of this catalog before you order anything.

Charging Pump and Hub Changes for TC-300

SPI 292 from August 1957 covers the release of a new converter charging pump and hub for TC-300 converters effective S/N 19085. The old hub P/N 6757605 gets canceled and replaced with 6768714. The old pump assembly 6757621 goes to 6768707. And here’s the kicker – the new gear and body assembly must be used with the new converter hub. You can’t mix the old pump with the new hub. The catalog tells you straight: service on the old hub will not be maintained. If you’re working on a TC-300 built after June 1957, you need that new hub. This is the kind of bulletin data that aftermarket papers never give you.

25 Pages of Factory Data – No Filler

This isn’t a reprint of a Chilton’s. This is a scan of the actual Allison factory parts catalog, SPI bulletins, and hand-drawn sketches from 1956-1957. Twenty-five pages, but every one of them has a purpose. You get exploded views of the converter pump cover assembly, the stator cam with spring installation orientation, and tables of part number supersessions. Need the old P/N for a roller guide on the TC-200? It’s 3691806, but it’s deleted – you use the new spring set instead. The catalog lists quantity per unit, so you know exactly how many of each part you need. No guessing.

Who Needs This Catalog

If you’re a home garage guy who just wants to keep an old dump truck or military vehicle on the road with a Torqmatic converter, this is your reference for ordering correct seals, bearings, stators, and pump assemblies. If you’re a pro shop with a 1950s fire truck or a bus that rolls a TC-200 or TC-300, this catalog saves you from ordering the wrong parts and wasting customer time. Even a beginner can use this – because the sketches show you the old vs. new parts visually, and the supersession tables are straightforward. Pair it with the service manual if you need rebuild procedures, but for parts identification, this is the only source you should trust. Check out the Allison Torqmatic Converters 200-300 Series Parts Catalog if you need the companion service manual.

Source Authenticity: Why OEM Trumps Aftermarket

Every time I see a parts listing on some third-party site that says “replaces OEM 6755271” with no serial number cutoff, I cringe. This catalog came out of Allison Engineering in Indianapolis. It was mailed to dealers in 1957. The part numbers are stamped on the components. When Allison changed the stator roller springs from coiled to convoluted, they published an SPI bulletin with part numbers and a drawing showing which way the open end of the spring faces toward the ground sleeve. That’s not detail you get from a generic parts list. Downloading this catalog from AutoRepairManuals means you’re looking at the same page a service manager in 1957 used. That’s credibility you can’t fake. For more on the history of Automotive Industry Overview, you can see how companies like Allison drove these improvements.

FAQ

Does this catalog include torque specs for converter bolts?

No. This is a parts catalog, not a service manual. It focuses on part numbers, supersessions, and engineering change bulletins. For torque values and assembly procedures, you need the factory service manual.

Can I use this catalog for the TC-200 if my converter serial number is below 19439?

Yes. The catalog covers all models of the TC-200. The stator assembly change at S/N 19439 is noted, and the supersession table shows both old and new part numbers. You can order the old stator assembly P/N 6755271 if it’s still in stock, but note that the new assembly 6769234 is interchangeable. However, you cannot mix individual components from the old and new assemblies. The catalog explicitly states: “All superseded parts, in spare parts stock, may be used but should not be used in conjunction with any of the new parts.” That’s a direct quote from page 2.

If you’re working on an Allison Torqmatic converter from the mid-1950s, whether it’s the 200 Series, 300 Series, or TC-200, this parts catalog is the only way to verify part numbers before you place an order. You’ll save yourself the headache of getting the wrong bearing, the wrong cam, or the wrong pump hub. Don’t rely on a third-party website that might have copied – or guessed – the numbers. Access the Factory Manual from AutoRepairManuals and keep it in your tablet or on your bench. Your torque converter rebuild deserves factory data.

Related Manuals:

• Allison Torqmatic Converter Series 200-300 Parts Catalog
• 1954 Allison Torqmatic Converter TC-200 TC-300 Parts Catalog
• Internal Combustion Engine