1989-1993 Dodge 5.9L Cummins Transmission Filters

Transmission filters on the 1989-1993 RAM 5.9L Cummins

Only the automatics on these trucks are served by a pan filter. That means the A727 TorqueFlite 3-speed used from 1989 to mid-1991 and the A518 4-speed overdrive, called the 46RH from 1992, used from mid-1991 through 1993. Both run ATF+4. The A727 schedule is fluid, filter and a band adjustment every 24,000 miles or 24 months, and the A518 holds 14.5 to 16.5 quarts. Getrag G360 manual trucks aren't covered by this page: that gearbox runs on 3.5 quarts of motor oil with a drain and refill every 60,000 miles.

Why the filter service matters

Heat is hard on both first-gen automatics. Burnt or overheated fluid goes along with the A518/46RH failures seen behind the Cummins, including slipping, a flare on the 2-3 shift and converter shudder, and rusted steel cooler lines can leak the level down. Dropping the pan to change the filter is your chance to see the fluid and what's sitting in the pan before a service turns into a rebuild.

What we carry

The Mag-Hytec 727 Transmission Pan Filter, listed for 1989-2007 5.9L Cummins trucks. Pair it with a new pan gasket and fresh ATF+4 from the transmission parts and fluid sections for this truck so the whole service goes in one order.

Fitment notes

The filter is named for the 727 pan, and its 1989-2007 listing spans both first-gen automatics. Sellers lump 727, A518 and 46RH together, and the A518 arrived mid-1991, so a 1991 truck can have either one; confirm by gear count and VIN. If your truck wears an aftermarket deep pan, follow the pan maker's instructions for the filter setup it calls for.

Frequently asked questions

How often should I change the transmission filter?

On the A727, the schedule is fluid, filter and a band adjustment every 24,000 miles or 24 months. On the A518/46RH, change it whenever you change the fluid. Towing heat is hard on these units, so don't stretch the service.

Does a manual G360 truck use this filter?

No. The filter is for the automatic's pan. The G360 runs 3.5 quarts of motor oil, 5W-30 by spec, and is serviced with a drain and refill every 60,000 miles.

What else should I replace with the filter?

A new pan gasket and fresh ATF+4 at minimum. On an A727, adjust the band at the same visit, since the schedule pairs the two. If you find burnt fluid, check the steel cooler lines for leaks before you button it up.

Not sure what fits? Call the shop at the number in the header, or use the fitment checker on any product page. We install everything we sell.