Description

Roadranger FS-4205A 2012 Parts Catalog

If you have ever ordered a countershaft bearing for an FS-4205A from a generic parts list and ended up with the wrong spline count, you know the frustration. This Roadranger FS-4205A 2012 Parts Catalog is the factory document – 23 pages of OEM illustrations and part numbers. No guesswork, no aftermarket interpretation. I have rebuilt more of these transmissions than I care to count, and the difference between using this catalog versus a third-party diagram is the difference between a one-day job and a week of returns.

CASE Section: What Is Included on Page 4

Page 4 of this parts catalog covers the CASE assembly. It shows the main housing, bearing caps, and associated hardware exploded with reference numbers. You cross-reference those numbers to the parts list to get the exact Roadranger part number. If you are replacing a cracked housing, you need this page. There is no substitute for an OEM illustration – the bolt patterns and dowel pin locations are correct. I have seen aftermarket diagrams misplace the PTO cover bolt holes.

Countershaft Assembly Breakdown

The countershaft assembly section starts on page 8. It details the gears, washers, and spacers that ride on the countershaft. Each gear is listed with its tooth count and part number. If you are doing a rebuild because of a chipped gear, you need to verify the tooth count. This catalog lets you do that. The layout is clean – one exploded view per page, no clutter. You can take it to the parts counter and point at exactly what you need.

How to Use the Illustrated Parts List on Page 3

Page 3 explains the system for identifying kits and assemblies. Part numbers starting with A are pre-assembled production assemblies. K means kit – unassembled parts. S means service assembly – pre-assembled for replacement. This is critical when ordering a synchro assembly or a shift fork kit. Grab the wrong prefix and you either get a box of loose parts you have to assemble or a costly pre-built unit you did not need. The catalog tells you which is which.

Kits & Assemblies: Understanding A, K, S Prefixes

Pages 11 through 13 cover KITS & ASSEMBLIES in detail. If you need a full overhaul kit, this section lists every gasket, seal, and bearing in one kit number. I have used these kits on FS-4205A units in Freightliners and Internationals. The factory kit includes the correct o-ring material and snap ring thickness – things aftermarket kits often get wrong. The catalog also includes the REMOTE CONTROL section starting on page 18, which covers the shift remote linkage parts. Do not overlook that if your transmission has a remote shifter; those parts are specific and hard to find without the factory drawing.

3 Critical Sections for Transmission Rebuild

When you are splitting the case, you need three sections from this catalog: MAINSHAFT ASSY (page 15), COUNTERSHAFT ASSY (page 8), and REVERSE IDLER GEAR ASSY (page 20). Each section has its own illustration and parts list. The reverse idler gear assembly is often ignored during rebuilds, but the thrust washers wear out and cause end-play. The catalog shows you the exact shim selection. Without it, you are guessing clearances.

FAQ – Four Common Questions About This Parts Catalog

Does this catalog include torque specifications?

No, this is a parts catalog, not a service manual. It does not list torque values.

How do I identify a kit versus a production assembly?

Look at the part number prefix. A-prefix items (e.g., A-12345) are production assemblies – they come pre-assembled from the factory. K-prefix items are kits – unassembled parts in a box. S-prefix items are service assemblies – pre-assembled replacements meant for the aftermarket. The catalog on page 3 explains this in detail. If you order an A-prefix synchro assembly when you only need the kit, you will pay more and have to disassemble the pre-built unit. Always check the prefix.

Is the remote control section for the shifter?

Yes, page 18 covers the remote control linkage and mounting hardware. It includes the shift tower and cables if applicable.

What vehicles use the FS-4205A?

Typically medium-duty trucks like Freightliner M2, International Durastar, and Ford F-650. This catalog is transmission-specific, not vehicle-specific.

Related Manuals

• Roadranger RTLO-14918B 2011 Parts Catalog – OEM Factory Document”>Roadranger RTLO-14918B 2011 Parts Catalog
• Roadranger RTLO-18918B-T2 2011 Parts Catalog – OEM Truck Parts Manual”>Roadranger RTLO-18918B-T2 2011 Parts Catalog
• Roadranger RTLO-14613B 2011 Parts Catalog – OEM Factory Document”>Roadranger RTLO-14613B 2011 Parts Catalog

For a broader understanding of how these transmissions fit into the automotive industry, see the Automotive Industry Overview”>Automotive Industry Overview. If you need background on how an internal combustion engine connects to the transmission, the Internal Combustion Engine”>Internal Combustion Engine page has related content.

Do not waste time chasing aftermarket diagrams that may or may not match your transmission. Access the Factory Manual directly from AutoRepairManuals and have the correct part numbers in your hand before you pull a single bolt.