Description

Allison 200, 300, TC-300 1976 Parts Catalog – Factory Specs for Torqmatic Converters

If you’re tearing down an Allison Torqmatic converter from the 200 or 300 series, you need the right part numbers. Ordering a TC-300 output shaft without checking the group variation means you’ll be staring at a box of wrong parts. This Allison 200, 300, TC-300 1976 Parts Catalog is the factory-issued document that tells you exactly which bolt, washer, bearing, and seal goes where. No reprints, no aftermarket guesswork – this is what the line workers used when those units were new.

Group F: SAE No. 2 Rear Disconnect Clutch Housing

On page 1 of this 53-page catalog, the TC-300 series output shaft groups start with Group F. It shows a housing for the SAE No. 2 rear disconnect clutch – part number 6777120. Same housing shape as Group A, but the part number is different because the disconnect clutch requires a specific flange. If you order a standard housing from a generic parts list, you get a unit that won’t bolt up. The catalog even lists recommended spares quantities for fleets running 1-3, 4-10, or 11-25 units.

Group G: Same Housing, Different Part – Why It Matters

Group G looks identical to Group F in the diagram, but the housing part number changes to 6831578. Why? Because the output shaft configuration changed – maybe the bearing preload shim pack or the seal bore. The catalog notes “Same as Group A, except for parts listed below.” That exception is everything. One digit off on the part number and you get a housing that won’t accept the turbine shaft. This is why you don’t use third-party parts lists.

Order the Right Turbine Shaft for Your TC-300

Group H covers the TC-300 output shaft with coupling. Here you find the turbine shaft – 6759946 for the coupling version. The catalog also lists a lock washer 103323, a bolt 1/2-20 x 1-1/4 (181429), and the output drive coupling 6757758. If you need the industrial shaft with accessory drive, you jump to Group J. That group uses a different turbine shaft (6759947) and adds an accessory drive gear (6755618) with a 2.5-to-1 ratio. The bearing assembly is a Timken 558S-553X (456635). Get the wrong group and your accessory drive won’t engage.

53 Pages of Factory Part Numbers – No Guesswork

This catalog was published in 1976 by Allison, so every part number in it is the original OEM release. The 53 pages cover the 200 series, 300 series, and the TC-300 variant. Each group (F, G, H, J) is broken out by specific output shaft and housing combinations. The recommended spare quantities tell you how many of each part to stock if you’re maintaining a fleet. A parts catalog like this doesn’t give you torque specs or overhaul procedures – that’s what the separate service manual is for. But without the correct part numbers, you can’t even start the job.

Real-World Application: Ordering the Correct Output Coupling

Imagine you’ve got a TC-300 unit on the bench. The old output coupling is worn. You pull up a generic parts website and search by transmission model – it gives you a coupling that looks right but has the wrong bolt pattern. Then you waste two days returning it and waiting for the correct one. With this catalog, you check Group H and see the coupling part number 6757758. You order that exact number. It fits. Job done. That’s the difference between a 53-page OEM catalog and a parts diagram from a forum.

Source Authenticity: Factory Print vs. Aftermarket Reprints

This is a scanned copy of the original Allison factory catalog. The part numbers, group references, and recommended spares are exactly as they appeared in 1976. Aftermarket reprints often blur the small text or misalign the table columns. Worse, some reprint companies “update” part numbers without telling you – they substitute superseded numbers that may not be direct replacements. This catalog gives you the original number so you can cross-reference with Allison’s current interchange list if needed. Trust the factory print, not a third-party compilation.

How to Use This Catalog with Your Repair Manual

Pair this parts catalog with the corresponding Allison service manual for the 200-300 series. The service manual gives you torque values, clearance specs, and assembly order. This catalog gives you the parts. When you’re rebuilding a TC-300, start by identifying your output shaft group using the diagrams on page 1. Write down every part number you’ll need – bearings, seals, rings, bolts. Then order them from an Allison dealer or distributor. Don’t assume parts are interchangeable between groups. The catalog makes it clear when a group “not used” certain references.

FAQ

Does this parts catalog include torque specifications?

No. This is a parts catalog, not a repair manual. Torque specs are in the service manual.

What’s the difference between Group F and Group G housings in the TC-300 series?

Both groups share the same basic SAE No. 2 rear disconnect clutch housing design, but the part numbers differ: 6777120 for Group F and 6831578 for Group G. The difference likely involves a bearing bore or seal surface dimension that changed during production. The catalog states “Same as Group A, except for parts listed below.” Without the factory catalog, you’d never know which housing your unit requires – you’d have to measure bores and compare, which wastes time. Using the correct part number from the catalog eliminates that guesswork.

Whether you’re rebuilding a single transmission or stocking parts for a fleet, the Allison 200, 300, TC-300 1976 Parts Catalog gives you the factory part numbers you need. Skip the aftermarket tables and use the original. Access the Factory Manual now and get the right parts on the first order.

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