Sonnax Ford 4F50N Transmission

Internal

Forward Planetary Bearing 96003-01

Bearing Style: Roller bearing

Helps cure:

Bearing noise
Bearing failure

Tooling:

96003-MTL

Pump

Oil Pump Shaft 96855-02K

Patented design increases oil flow

Helps cure:

Scored shaft

Pump Slide Pin 96200-02

Helps cure:

Lost or damaged component

Valve Body (View Valve Body Layout Diagram)

Boost Valve Kit 96201-12K

Fits 3.0 liter 12 valve, O-ring style.

Helps cure:

1-2 Flare
2-3 Flare
2-1 Clunk
Harsh Reverse
Clutch failure
Band failure
Non-adjustable (high) throttle pressure

Boost Valve Kit 96201-08K

Fits all except 3.0 liter 12 valve, factory style sleeve, no O-ring.

Helps cure:

1-2 Flare
2-3 Flare
2-1 Clunk
Harsh Reverse
Clutch failure
Band failure
Non-adjustable (high) throttle pressure

Boost Valve Kit 96201-01K

Fits all except 3.0 liter 12 valve, O-ring style.

Helps cure:

1-2 Flare
2-3 Flare
2-1 Clunk
Harsh Reverse
Clutch failure
Band failure
Non-adjustable (high) throttle pressure

Bypass Clutch Control Plunger Valve Kit 96206-03K

.486" OE large spool diameter

Helps cure:

Code 628
TCC cycling
TCC surge
No lockup
Lube failures
Excess cooler circuit oil loss

Bypass Clutch Control Plunger Valve Kit 96206-13K

.496" OE large spool diameter

Helps cure:

Code 628
TCC cycling
TCC surge
No lockup
Lube failures
Excess cooler circuit oil loss

Forward Control Valve Kit 96206-07K

Helps cure:

Coastdown Neutral after 4th Gear
No Forward
No 4th
Burnt Forward clutch

Oversized Bypass Clutch Control Valve Kit 96206-05K

Helps cure:

Code P0741
TCC shudder
TCC cycling
Excess TCC slip
TCC apply & release concerns

Tooling:

96206-TL

Oversized Converter Regulator Valve Kit 96201-23K

Works in 2- or 4-spooled OE applications

Helps cure:

Code 628, 741, 744
TCC cycling
Overheating & reduced lube feed
Delayed engagement
Overheated converter
Blued converter
TCC surge
4th Slip
Coastdown Neutral
No 4th

Tooling:

F-96201-TL23
VB-FIX

Oversized Pressure Regulator Valve Kit 96206-10K

Late-style

Helps cure:

Erratic line pressure
Delayed engagement
Pump noise
Pump rotor & cover damage
Overheated converter
Lube failures

Tooling:

96206-TL2

Oversized Solenoid Regulator Valve Kit 96201-21K

Helps cure:

Code 1741, 1744
TCC cycling
No lockup
TCC surge

Tooling:

96201-TL2

Pump Shaft Sleeve 96201-18

Helps cure:

Lost or damaged component

Relief Valve 10000-01K

Low radius

Material: Steel

Helps cure:

Pressure loss
Converter drain back

The Sure Cure® Kit SC-AX4N

Helps cure:

Clutch & band failures
Non-adjustable (high) throttle pressure
1-2 Flare
2-3 Flare
2-1 Clunk
Neutral after 4th
No 4th
Harsh Reverse
No Forward
Delayed engagement
TCC cycling
TCC surge
Code 741, 1741, 1744
TCC apply & release concerns
TCC codes & overheating

Tooling:

96206-TL
96201-TL2
96201-TL3

Case

Stator Support Shaft 96849-01K

Fits '86-'03, Bushing & bearing already installed

Helps cure:

Scored shaft

Stator Support Shaft 96849-02K

Fits '04-later. Bushing & bearing already installed

Helps cure:

Scored shaft

Servo/Band

Servo Pin Bore Sleeve 96872-01K

Helps cure:

3-4 Flare
Burnt OD band
Worn OD servo pin bore in case

Tooling:

S-96872-TL
SERVO-FIX

Other

Tool Kit 96206-TL2

Tech Resources

January 25, 2023

Uncovering the Root Cause of Pressure & Complaints – The Critical Role of Solenoid Modulator & AFL Valves

Maura Stafford

December 12, 2014

Ford AX4N/4F50N Valve Body Layout

January 01, 2013

AX4N Valve Body Identification

Valve Body Xpress

January 01, 2013

4F50N, '04-Later: No Forward or Reverse After Valve Body Replacement

Valve Body Xpress

October 31, 2009

Point of No Return - "Point de Non-Retour"

Serge Martin

May 16, 2006

SonnaFlow® Chart AX4N (Normal & Poor)

March 19, 2004

AX4S and AX4N Turbine Speed Sensors

Mike Steen

September 21, 2003

Ford Bypass Converter Clutch Circuits

Gregg Nader