4HP20 Gearbox Rebuild
Introduction
A pictorial of a 4HP20 rebuild
Installing the output bearing carrier. Note tape wrapped arounmd socket to avoid any damage to the F piston bore.
Tightening the bolts. 35N/m Torque.
F Brake Diaphragm Spring
Fitting the spring retainers
Park Pawl mechanism
F Brake Plates
F Brake Drum
Gaskets fitted
Oil Filter Installed
Housings joined and bolted up
Just before being tapped with a mallet to send seals home
D Brake Piston installed
Followed by the wavy ring
Depressing the D diaphragm spring to allow the D brake to disassembled
Installing the C and D Brake pack
Followed by the C Brake Piston
And the Inner Annulus, Planetary Sun Gear set
Input Shaft and B/E Clutch Assemblies
Showing the order of the B/E Clutch Spacer and Bearing that controls Input Shaft End Float
Replacing Transmission Cover
Checking the Input Shaft end float
Oil Pan (Valve Block Cover) Swarf magnets before Cleaning
And After!
Output Speed Sensor Installation
Valve Block Installed
The KOSTAL socket clip installed
Multi Function Switch
And finally.. The Vehicle Speed sensor
Job Done!
Page last updated 06 November 2009