18 Speed Transmissions

Not sure which transmission you have? How to identify your Eaton Fuller transmission · 18-speed tag location diagram

Eaton Fuller 18 Speed Transmissions

Pro Gear and Transmission stocks Eaton Fuller 18 speed transmissions in remanufactured exchange and new condition: the RTLO-18918B, RTLO-18918B-HALO, RTLOF-18918B, RTLO-16918B, RTLO-20918B and RTLO-20918B-HALO, plus the full run of Eaton factory reman and new program units from the RTLO-16718BR up to the RTLO-22918BR and the FO-E318 series. Remanufactured exchange units are on the shelf and ready to ship today — the RTLO-18918B usually ships within 24 hours. We stock thousands of transmissions in 25 warehouses all across the country. We offer Eaton Fuller 18 speed transmission models with Eaton's standard two (2) year warranty. Add a year of warranty coverage when you bundle a Standard or Flex Eaton reman transmission with an Advantage Series or EverTough clutch and Eaton's PS 386 P/N: 5564543M lubricant. You must register to receive the Reman Bundle warranty found here.

To order now or get expert help with any of our transmissions for sale, call us at (877) 776-4600 now. Our product list for 18 speed Eaton Fuller transmission online does not fully represent our entire inventory — if you don't see what you've searched for, it's likely we still have it.

Remanufactured exchange 18 speed units in stock

Eaton factory reman and new 18 speed program units

Every unit below is a genuine Eaton Fuller program transmission ordered by its TA or TN number. Reman units are sold on exchange with a core charge; new units carry Eaton's standard warranty. Match the model on your data tag, then pick the condition you want.

Eaton Fuller 18 speed gear ratios

The RTLO-18918B has 19.7:1 overall ratio coverage with a 14.40:1 deep-reduction low gear and double overdrive at 0.73 and 0.86. The RTLO designation means a top-mounted range cylinder, twin countershaft, low-inertia design with overdrive gearing. Ratios differ by model, so confirm yours from the model number on the data tag before ordering. Need the in-cab reference? The 18 speed shift pattern diagram (Eaton P/N 21628) is a stocked part.

What oil does an Eaton Fuller 18 speed take, and how much?

Eaton specifies its PS-386 synthetic transmission lubricant (P/N 5564543M), and using it is part of the Reman Bundle warranty registration. The RTLO-18918B holds approximately 28 pints (13.2 L). HALO models add a forced-lube oil pump and the Halo oil tube system on top of the standard fill.

Eaton Fuller 18 speed transmission specs

RTLO-18918B: 18 forward speeds, 1,850 lb-ft torque capacity, twin countershaft with a top-mounted range cylinder, approximately 730 lb. Every RTLO 18 speed shares the twin-countershaft, low-inertia overdrive layout; the model number on your data tag identifies the exact rating. For a part-by-part breakdown, see the RTLO-18918B parts manual.

New vs reman 18 speed transmission — which should I buy?

A remanufactured exchange unit is the fastest and lowest-cost way back on the road: it ships from stock, carries Eaton's two-year warranty (three with the bundle), and you return your old unit as the core. Core charges apply and may be refunded in whole or in part after delivery and inspection, subject to the manufacturer's core policy. A new Eaton unit (TN-numbered) is the choice for a new build or when you want a factory-new gearbox. Not sure which you need? Call (877) 776-4600 with the model number, TA number and serial number from the tag on the passenger side of your transmission.

How do I identify my 18 speed transmission?

Locate the data tag on the passenger (right) side of the transmission and note the model number, TA number and serial number — that is everything we need to confirm fit. Use the identification links at the top of this page for the tag location. Looking for a 13 speed instead? Browse our Eaton Fuller 13 speed transmissions, or see the RTLO-20918B HALO for the forced-lube version of the 20918B.

Browse all Eaton Fuller Transmissions — new, used & rebuilt.