4R100 Overhaul Kit 2000

If your 2000 Ford F-250 or F-350 Super Duty, first-year Excursion or E-Series van is flaring between gears with a trailer on, slow to grab Drive on a cold morning, or dripping fluid from the pump and case seams, the 4R100 behind the 7.3L Power Stroke, 5.4L or 6.8L V10 is telling you it wants a teardown. This new 4R100 overhaul kit is listed for the 2000 model year and is pictured with bagged friction and steel packs, the gasket set, lip seals, molded piston seals and the sealing rings and O-rings needed to reseal every circuit. Check the box contents against your teardown before you start cleaning parts, so nothing is missing mid-build.

What the overhaul kit does in a 2000 4R100

Every clutch in a 4R100 is applied by fluid pressure pushing on a piston, and each piston only works if its rubber seal holds that pressure. The overdrive, forward, direct, intermediate, coast and low/reverse circuits all depend on sealing rings and gaskets that harden with heat and miles. Once they leak, line pressure bleeds off, clutches apply slowly and slip, and the slip makes more heat. An overhaul kit replaces those soft parts in one pass, so a rebuilt unit holds pressure the way it did when it left Ford. By 2000 the 4R100 already had the 1998 updates over the E4OD: the revised pump on the shared F81P casting, a stamped-steel coast clutch drum, and PWM converter clutch control on the diesel. That matters for what you reuse, covered below.

Symptoms that point to a reseal and rebuild

• Delayed engagement into Drive or Reverse when the fluid is cold, improving once warm
• Slipping or flare on the 2-3 or 3-4 shift, worst when towing or climbing
• Fluid leaks from the front pump seal, pan, or case connector area
• Dark fluid with clutch material on the pan magnet
• Loss of overdrive or a sudden internal failure; Sonnax lists overdrive piston retaining ring pop-out as catastrophic on a 4R100, not just a lost gear

How to confirm before you buy

A 2000 4R100 can shift badly for electrical reasons alone. Pull codes, inspect the case connector for a broken lock tab or green pins, and test the solenoid pack before condemning the hard parts. Our E4OD and 4R100 common problems guide walks through those checks, and the shift solenoid symptoms guide covers resistance testing. If pressure is good and the pan is full of friction material, the soft parts are worn and this kit is the right buy.

Fitment for the 2000 model year

This listing covers 2000 4R100 applications: F-250 and F-350 Super Duty, the 2000 Excursion and E-Series vans. Within that year the unit still varied by engine and drivetrain, including diesel PWM lockup versus some gas units with on-off lockup, and 4x2 versus 4x4 cases. Match the ID tag on the driver side of the case, or send us your year and VIN and we will confirm before it ships. For other years and the hard parts that go with this rebuild, see the full E4OD and 4R100 parts collection.

Install notes

• Soak friction plates in MERCON V for at least 30 minutes, and pre-lube rubber seals before installing pistons.
• Use assembly gel on sealing rings and air-check each clutch circuit before the valve body goes on.
• Inspect the coast clutch drum: a 2000 unit usually has the bushing-supported stamped drum, and Ford's later bearing-supported drum retrofits back to 1998.
• Replace the overdrive piston retaining ring with a positive-lock ring rather than reusing the original.
• Finish with a fresh deep pan filter and gasket kit, and replace a tired 4R100 solenoid kit while the unit is out, since the pack is a known failure point.
• Flush the cooler and lines; debris from the old unit will ruin new frictions within miles.

For the full list of what changed between the two generations, read 4R100 vs E4OD differences before you mix parts from a donor.

Will this kit fit my 2000 F-250 with the 7.3L Power Stroke?

It is listed for 2000 4R100 applications, which includes the 7.3L Super Duty. Diesel units use PWM converter clutch control, so match the ID tag or send your VIN and we will confirm before it ships.

What fluid does a 2000 4R100 take after the rebuild?

MERCON V. Ford originally specified MERCON, which was discontinued in 2007, and MERCON V is the current service fluid. Pre-soak frictions in the same fluid.

What else should I replace with an overhaul kit?

Plan on a new filter and pan gasket, the solenoid pack if it tests weak, the overdrive piston retaining ring, and any bushings or thrust washers that show wear. A flushed or new cooler protects the rebuild.

Can I reuse my coast clutch drum?

If it is not cracked or worn at the bushing journal, usually yes. Ford's later bearing-supported coast drum retrofits back to 1998 if yours is worn.

Do I need a relearn after installing the rebuilt unit?

Clear codes and let the PCM adapt over normal driving. Check the fluid level hot, in Park with the engine running, after the first drive.

• 4R100 vs E4OD: Differences, Interchange and Which Is Stronger
• E4OD Common Problems and Fixes
• E4OD Shift Solenoid Symptoms and Replacement
• E4OD Cooler Line Replacement Guide