4R100 Clutch Module 1998, new and ready to install. Fits the 4R100. Ships fast from the USA.
1998 was the first model year of the 4R100, the heavy-duty four-speed Ford put behind the 7.3L Power Stroke, 5.4L and 6.8L V10 when the Super Duty arrived, and in the E-Series vans. Those early trucks are now well past the point where the original frictions are glazed. If yours flares between gears with a trailer behind it, slips pulling a long grade, or the fluid on the dipstick is dark and smells burnt, this new Raybestos Clutch-Pack module gives you fresh friction plates for a 1998 rebuild.
ATSG describes the 4R100 as the updated E4OD: three simple planetary gearsets, an intermediate band, and six multi-disc clutches named coast, overdrive, intermediate, direct, forward and low/reverse. Each pack alternates lined friction plates with steels. When the PCM sends line pressure to a piston, the stack clamps and holds a planetary member to make the gear. Worn lining means the pack needs more pressure and more time to hold, which you feel as a flare or a long, soft shift.
The 1998 unit is where the coast clutch changed. Ford dropped the E4OD cast iron coast drum for stamped steel drums with wider steel plate teeth. The non-PTO drum holds two coast frictions; the PTO drum holds three and carries the PTO drive gear. Count the coast frictions in your drum before installing so the pack stack matches the drum you have.
The 4R100 can fake a slip electrically. Solenoid pack faults, a corroded case connector, or an EPC circuit problem can all cause soft or flaring shifts with healthy clutches. Scan for codes and test the solenoid body using our E4OD and 4R100 shift solenoid guide. Codes for pressure control, along with a flashing overdrive light, point to the circuit covered in our EPC solenoid symptoms guide. Sonnax also documents low pump volume at low engine speed on this unit, so check line pressure at idle and under load. Good pressure plus a slip in one gear only means that gear's pack is the problem.
This module is listed for the 1998 4R100. Because 1998 was the changeover year, confirm you have a 4R100 and not a late E4OD: look for the PTO port on the case, which the 4R100 has and the E4OD does not. Also note whether your coast drum is the PTO or non-PTO design, since the coast friction count differs. Units from 1999 on can use a revised bearing-supported coast drum. If you are not sure, send us your year and VIN. Other years and versions are on our E4OD and 4R100 collection page, including the 4R100 clutch module for 1998-2004.
| Fits | 4R100 1998 |
| Part type | Clutch Module |
| Condition | New |
| Brand | Raybestos |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
It is listed for the 1998 4R100 used in the Super Duty and the E-Series vans. Confirm your case has the PTO port that marks a 4R100, or send us your year and VIN to check.
The 1998 PTO coast clutch drum uses three frictions while the non-PTO drum uses two. Count what came out of your drum and check it against the module before you build the coast pack.
Use MERCON V automatic transmission fluid. Soak the frictions in it for at least 30 minutes before assembly and fill to the level on the dipstick with the engine running at operating temperature.
Not by themselves. Solenoid pack, connector and EPC circuit faults can mimic a slip, so fix the code and test line pressure first. Frictions fix a slip only when the clutch lining is actually worn.
Piston seals and gaskets for every pack you open, the filter, worn bushings, and any steels that are warped or heat discolored. A truck that tows should also get an auxiliary cooler.
