Description

Borg Warner T4, T45, T5, T55, T56 2012 Parts Catalog

If you are rebuilding any Borg Warner gearbox – T4, T45, T5, T55, or T56 – and you are staring at a bench full of bearings, thrust washers, and synchro hubs, the difference between a right part and a close part is exactly one incorrect bearing race. Close means a tear-down three weeks later, a case full of metal, and a phone call you do not want to make. This Borg Warner T4, T45, T5, T55, T56 2012 Parts Catalog is what the factory uses to pull parts off the shelf. It is not a reprint of someone else’s notes. It is not a third-party cross-reference that guesses the OE number. It is the original OEM parts listing with OE numbers, installation point codes, and supplier listings from INA, SAAM, and FAG. Every page is dated 01.03.2012, and the file runs 927 pages.

Parts in Gearbox: How the Table Is Structured

Page 1 opens with a clear column layout: Parts in gearbox, Application (which transmission), OE no., Installation point, then the supplier columns INA, SAAM, FAG, followed by Type and VPE. Look at the T5 entry: 3rd gear, OE number 10-00-132-046, installation point FC 66256.1, supplier code K, type PC. That is the level of detail you get. Page 2 continues with T55 and T56 listings. You do not waste time hunting through aftermarket catalogs that list a part as “fits multiple models” without telling you which specific gear position it goes in. This catalog tells you exactly: 1st gear, 3rd gear, Freewheel, output shaft – the installation point column is the physical location inside the transmission.

Why OE Numbers Matter More Than Aftermarket Cross-References

Aftermarket catalogs often give you a generic bearing number and say “replaces OEM.” That is a gamble. This catalog gives you the genuine Borg Warner OE number – for example, FC 66256.1 – and then the manufacturer-specific numbers from INA (F-392121), SAAM (KZK), and FAG (712 1166 00). If you need a bearing for a T45 second gear, you see the OE number, the INA number, and the FAG number on the same line. You can cross-reference your existing part against any of those and know you have the right piece. No guesswork. No calling the parts counter three times.

Installation Point Codes: Don’t Mistake a 3rd Gear Bearing for a 1st

The installation point column is not optional reading. Look at the T4 entries on page 1: for the same gearbox, there is a bearing listed as “3rd gear” with FC 66256.1, and another as “1st gear” with FC 66888.1. Swap those two and you will have a gear train that grinds on engagement or fails under load. The catalog also marks freewheel positions – “Freewheel, 1st gear” and “Freewheel, 2nd and 3rd gear” for the T55 and T56. If you are rebuilding a T56 6-speed, page 2 shows the freewheel bearing for 2nd and 3rd gear uses K 42x47x13 A under OE number 13-00-132-014. That is the kind of specific detail that saves you from ordering the wrong part.

Supplier Codes: INA, SAAM, FAG – What Do They Mean?

Each column corresponds to a bearing manufacturer: INA (Schaeffler), SAAM (likely a European supplier code), and FAG (also Schaeffler). The catalog shows which original equipment supplier made that specific bearing. For a T55 application, the INA number FC 66256.1 and the FAG number 712 1166 00 both appear. If you are sourcing bearings from a local distributor, you can walk in with the FAG number and get the exact factory part. The Type column (e.g., K, RH, KI, TC) indicates the bearing type – needle roller, tapered roller, cage assembly. VPE stands for packaging unit – usually 1 piece per unit. This is not a service manual with torque specs; it is a Parts Catalog for ordering, but you need those codes to buy the correct part the first time.

T56 Specifics: What This Catalog Covers for the 6-Speed

The T56 section (page 2 and 3) lists bearings for 1st gear, 5th gear, and freewheel positions. One common failure point on the T56 is the 5th gear bearing (FC 66256.1 again). The catalog also shows the rare ARRE type bearing (F-223521.06) for the T55 and T56 – that is a one-way clutch bearing. If you are rebuilding a T56 for a Camaro or Mustang, having the correct OE number for that ARRE bearing means you do not end up with a slipping overdrive. The catalog also includes Chrysler 45RFE and T850 entries, and Dana CM49/CM50 – so if you work on mixed fleets, you get those cross-references as well.

Audience Fit: Not Just for Transmission Shops

If you are a DIY mechanic rebuilding your own Borg Warner transmission at home, this catalog is your parts bible. You do not need to be a professional to use it – the table is straightforward. If you are a shop owner, you hand this to your parts guy and say “match these numbers.” The catalog works for anyone who needs to identify a bearing, a seal, or a synchronizer assembly for a T4, T45, T5, T55, or T56. It does not include step-by-step removal instructions – that is a service manual – but for parts identification it is the only source that matches the factory bin.

Does this catalog include torque specifications or assembly instructions?

No. This is a parts catalog, not a service manual. It lists OE numbers and supplier codes only.

Can I use this catalog to identify parts for a T45 rebuild if I only have the old bearing in hand?

Yes. Look up the physical bearing markings – often they have an INA or FAG number stamped on the race. Cross-reference that number in the catalog columns, and you get the Borg Warner OE number, installation point, and which gear it belongs to. For example, if your T45 bearing reads FC 67859, page 2 shows that as the INA number for a T45 application, with OE number AK-21-134-003 and installation point RB. That tells you exactly which bearing you need and where it goes inside the transmission. The catalog also lists multiple supplier numbers per line, so you can match any brand – INA, SAAM, FAG – to the same factory part.

If you work on older equipment alongside these transmissions, you might also need the Massey-Harris-Ferguson FF 30 GS 1957 Parts Catalog | OEM Fastener Guide for those metric-to-inch fastener conversions on vintage tractors. For modern wear parts on other brands, check the Futura FC200-FC400 Parts Catalog – OEM Wear Parts Specs and the Longagribusiness 410 DTC, 450, 450 DTC, 470 DTC, 530 DTC 2002 Parts Catalog for agricultural driveline components. For background on the bearing industry standards used in this catalog, see the Automotive Industry Overview. And if you need reference on battery systems for the electronics in these vehicles, the Automotive Battery page may help.

Stop ordering parts by guesswork. Access the Factory Manual and get the exact OE numbers, supplier codes, and installation points for every Borg Warner T4, T45, T5, T55, and T56 transmission built through 2012. 927 pages, factory-sourced, dated 01.03.2012.