5R44E Overhaul Kit 1997-2005

A 1997-2005 Ranger or Mazda B2300, B2500 or B3000 with the 5R44E five-speed automatic usually ends up needing this kit for one of two reasons: it is leaking at the front of the bellhousing or the back of the tailshaft, or it has lost reverse or a gear and the transmission is coming out anyway. This is the Precision International KP53900T overhaul kit, new in its original packaging. In the listing photo you can see what it covers: the pan gasket, the valve body gaskets, the front pump seal and rear seal, the large case O-rings, and packets of piston seals, small O-rings and sealing rings. It reseals the transmission. It does not renew the clutch plates, bands, filter or bushings, which are bought separately.

What the overhaul kit does in a 5R44E

Sonnax traces this family to the 1995 4R44E behind the 2.3L and 3.0L engines. The 4.0L got beefed-up drive components as the 4R55E, and from 1997 both became five-speeds by applying the front servo for an overdriven first, giving the 5R44E and 5R55E. The 5R44E is the lighter-duty of the two, but its hydraulics are the same design. Every clutch piston and both servos apply through seals in this kit, and the sealing rings carry that oil across the rotating drums and support. When the rubber hardens, apply oil escapes, the clutch or band slips, and heat finishes the job.

Signs a 5R44E needs resealing

• ATF dripping from the bellhousing seam, the pan or the extension housing
• Slow engagement into drive or reverse until the truck warms up
• Reverse that fades or quits once the fluid is hot
• A gear that flares or slips more as the drive goes on
• A tired unit already apart for clutches or bands

Rule out valve body wear first

Seals are only half of a lasting repair. The Sonnax vacuum test guide for this valve body lists worn reverse modulator valves as a cause of delayed or no reverse, a burnt reverse band and a burned direct clutch, and a worn pressure regulator valve as a cause of low or high line pressure, overheating and low cooler flow at idle. If you reseal around a worn valve body, the new seals and plates face the same pressure problems the old ones did. Run a line pressure test and use our 5R55 harsh or delayed shifts walkthrough to sort hydraulic faults from mechanical ones. The high-mileage service checklist covers what else to look at while the pan is down. If the valve body is the problem, the 5R44E valve body is the fix.

Fitment

Precision lists KP53900T for 1997-2005 4R44E, 5R44E and 5R55E transmissions in Ford, Lincoln, Mazda and Mercury vehicles. For the 5R44E that means the 2.3L, 2.5L and 3.0L Ranger and the matching Mazda pickups of those years. Sonnax points out that the 5R and 4R separator plates differ and that the family went through many plate and solenoid changes, so lay your old gaskets next to the new ones before you begin. If you are unsure, send us your year, model and engine size. For a later truck, use the 5R44E overhaul kit for 1997-2011. Everything else for this family is on our 5R55 family parts page.

Install notes

• Work in a clean area; grit on a new piston seal tears it on assembly.
• Soak the lip seals in Mercon V before installing and lube the sealing rings with assembly gel so they stay centered.
• Install new servo pistons and check each servo seal for nicks before it goes in.
• Seat the separator plate on its alignment pins before the valve body bolts go in.
• Air-check each clutch circuit before closing the case.
• Fill with Mercon V and check the level with the fluid hot.

Most full rebuilds pair this reseal with the 5R44E clutch module for new frictions. If the bands or drums are burnt, the 5R44E master rebuild kit covers more of the job in one box.

Does this kit include clutch plates or bands?

No. KP53900T is a gasket and seal overhaul kit. Frictions, steels, bands, the filter and bushings are separate; our 5R44E clutch module and master rebuild kit cover those.

Will it fit my 2003 Ranger with the 3.0L?

Yes, if it has the 5R44E automatic. The kit is listed for 1997-2005 4R44E, 5R44E and 5R55E units. Compare your old gaskets to the new ones before you start.

Is the 5R44E kit the same as the 5R55E kit?

Yes, this part number is listed for the 5R44E, 5R55E and 4R44E. The 4.0L 5R55E has heavier-duty drive components, per Sonnax, but the gasket and seal set for these years is the same kit.

My truck has no reverse. Will new seals fix it?

Sometimes. Hard or blown servo and direct clutch seals cause it, but so does a worn reverse modulator valve or low line rise. Test line pressure before you commit to a reseal alone.

What fluid goes back in?

Mercon V. Pre-soak the seals in it and set the final level with the transmission at operating temperature.

• 5R55 Harsh or Delayed Shifts: A Diagnostic Walkthrough
• 5R55S High-Mileage Service Checklist
• 5R55S Identification Guide: 5R55S vs W, N and E