Description

Roadranger RTLO-18918B-T2 2011 Parts Catalog – What You Get When the Job Calls for Exact Part Numbers

If you’ve ever stood at the parts counter with a disassembled transmission spread across the bench and a counter guy asking, “Which mainshaft? There’s three variants,” you already know why this 40-page catalog exists. Roadranger’s RTLO-18918B-T2 is a 18-speed manual with a nasty habit of swallowing synchros if you guess the wrong kit. This isn’t a service manual – it’s a parts catalog. That means exploded views, reference numbers, and the exact OEM part callouts you need to order the right piece the first time. No fluff, no guesswork, just factory data from July 2011.

AUXILIARY DRIVE GEAR and Case Breakdowns – Page 4 to Page 9

First thing I check on any Roadranger RTLO-18918B-T2 is the auxiliary drive gear assembly. Run that gear dry and you’ll be splitting the case before the week’s out. The catalog dedicates page 4 to that group alone, with every bearing, spacer, and snap ring listed. Pages 5 through 9 cover the AUX case, front case, and the forced‑lube front case variant. If your rig has the optional forced lube pump, you need the CASE (FRONT) FORCED LUBE section – page 9 – or you’ll order the wrong gasket set. I’ve seen it happen.

Countershaft and Mainshaft Assembly Groups – Who Needs Which Shaft?

Two separate sections here: COUNTERSHAFT & BRGS(AUX) on page 11, and the full COUNTERSHAFT ASSY on page 12. Same for the mainshaft – the aux synchro group lives on page 22, the main assembly on page 23. Don’t mix them up. The aux countershaft uses different bearings than the main box. The catalog gives you the OEM part numbers for each sub‑assembly. That’s the difference between a 30‑minute parts pull and chasing a discontinued bearing across three states. Pair this with the Roadranger RTLO-14918B 2011 Parts Catalog – OEM Factory Document if you’re working on both 18‑speed families – the bearing numbers overlap but the synchro kits do not.

FILTER REGULATOR and Valve Section – Air System Parts That Get Overlooked

Page 13 shows the FILTER REGULATOR. Page 14 covers the H & C W/A-5000 VALVE. These are the air‑shift control components. If the transmission won’t engage high range or the splitter hangs, nine times out of ten it’s a regulator diaphragm or a valve seal, not a mechanical failure. The catalog lists the rebuild kit numbers. That’s page 14 data. Don’t replace the whole valve bank when a $12 O‑ring will fix it. The Automotive Industry Overview doesn’t cover these transmission‑specific air controls – only an OEM parts catalog will.

Oil Cooler, Oil Filter, Oil Pump – 3 Reasons to Keep This Catalog on the Truck

Pages 25, 26, and 27 cover the lubrication system: OIL COOLER, OIL FILTER, and OIL PUMP (plus the forced‑lube pump variant at the end of the book). Every cooler line fitting, every seal, every pump drive gear is shown. The oil filter section on page 26 has the OEM filter part number – don’t let a parts store sell you a spin‑on that doesn’t match the thread pitch. On a 2011 RTLO-18918B-T2, the cooler mounting bracket is different from earlier models. The catalog makes that clear. If you’re swapping a cooler from a wrecked truck, check page 25 first.

KITS & ASSEMBLIES – Why a Single Page Saves You a Second Teardown

Page 18 is the KITS & ASSEMBLIES section. This is where Roadranger bundles all the wear items for a typical overhaul: gasket kits, synchro kits, bearing kits. If you order a kit without referencing this page, you might get a partial set. I’ve watched a shop install a “complete” overhaul kit that was missing the auxiliary synchro because the parts guy pulled the wrong kit number. The catalog lists each kit’s component breakdown. Cross‑reference with the Roadranger RTLO-14613B 2011 Illustrated Parts List – same year, different ratios, but the kit content logic is identical.

ISOLATORS and LEVERS/HOUSINGS – The Little Parts That Stop Big Leaks

Page 17 lists isolators (rubber mounts and vibration dampers). Page 20 shows the shift lever housings. Both are common failure points in high‑mileage trucks. The isolator part numbers are specific to the RTLO-18918B-T2; don’t assume the RT-8608L isolators fit. Check the Roadranger RT-8608L 2011 Parts Catalog to see the difference. Also on page 20: the shift tower gasket. It’s a $5 part, but if you tear it during a lever swap, you’ll be pulling the floor mat again. Save the aggravation.

How to Use This Catalog (Page 3) – Read It Before You Touch the Box

The first page that matters is page 3: “How To Use The Illustrated Parts List.” It explains the reference number system, how to match exploded views to the parts table, and where to find supersession notes. On a 2011 Roadranger, some part numbers have been superseded. The catalog flags those with an asterisk. Skipping page 3 is how you end up ordering a part that’s been replaced by three different numbers. Also, if you’re new to Roadranger transmissions, the Internal Combustion Engine resource gives background on drivetrain theory, but the catalog gives the practical numbers.

Is This Manual Worth 40 Pages? Yes – If You Value Factories Over Aftermarket

I’ve seen aftermarket parts catalogs for these transmissions. They’re printed on paper that feels like newsprint, and the part numbers are often scanned from a copy of a copy. This Roadranger RTLO-18918B-T2 2011 Parts Catalog is a direct OEM file – original print from July 2011. Every page number matches the factory layout. The illustrations are clean. The torque values for fasteners aren’t here (that’s what the service manual is for), but the part breakdown is correct. If you want to know what the factory specified for an oil cooler hose or a synchro ring, this 40‑page catalog is the source.

Does this catalog include assembly torque specs?

No. This is a parts catalog, not a service manual. Torque values are in the Roadranger workshop manual. The catalog only lists part numbers and group assemblies.

Can I use this catalog for a 2010 RTLO-18918B-T2?

Possible, but the 2011 edition includes superseded part numbers that were updated in early 2011. A 2010 catalog may list discontinued numbers. Always use the year that matches your build date.

How are the exploded views organized?

Each group (e.g., “INPUT SHAFT & DRIVE GEAR” on page 16) shows an exploded diagram with reference numbers. The facing page has a table with the part number, description, and quantity. Very straightforward.

Is the oil filter part number on page 26 cross‑referenced to any Wix or Fram numbers?

No. The catalog only lists the OEM Roadranger part number. You’ll need to cross‑reference that number with an aftermarket filter guide. But the OEM number is the one you need to verify anyway.

Wrap-up: You’re looking at the right catalog if you need to order parts for a Roadranger RTLO-18918B-T2 and you want to avoid the headache of wrong bearings, missing seals, or mismatched synchro kits. 40 pages, factory original, 2011 edition. Everything is in here: auxiliary drive gear, mainshaft, oil pump, filter regulator – all the groups listed on the contents page. Access the Factory Manual from AutoRepairManuals and stop borrowing a buddy’s scanned copy that’s missing every other page. This is the one you keep on the workbench.