I'm having some issues with the 4HP22EH auto transmission in my '86 635. Its the electronically controlled type.
I'd like to understand my options for sourcing a replacement should I need to go down that path. Will any 4HP22EH transmission from an E32 735i, or E34 or E28 fit the E24 without any mods? Or were there variances between vehicle models and/or years of manufacture?
They are different.
The Electronic Control system was first introduced in 1986 and was incorporated into the totaly hydraulic 4HP-22 unit produced by ZF. It combines the hydraulic control of forward and reverse gear engagement, with electronic control for automatic upshifts from 1st thru 4th and automatic downshifts from 4th thru 1st gears.
Three different versions of valve bodies have been used on BMW vehicles, with minor differences between them
The 1st version, designated Early "E-7", has 5 solenoids on the valve body, was introduced in 1986 and used up thru 1989. This version includes a solenoid for reverse lockout.
The 2nd version, designated Late "E-7", has 5 solenoids on the valve body, was introduced in 1988 and used up thru Mid-1989. This version includes a solenoid for reverse lockout.
The 3rd version, designated "E-9", has 4 solenoids on the valve body, was introduced in Mid-1989 and used up thru 1994. This version uses a shift solenoid for the reverse lockout function.
SHIFT QUADRANTS FOR ZF 4HP-22/24 SERIES are different
Early "E-7" Models Only (5 Solenoid)
Mode Switch Description
A rotary switch with three fixed positions and an indicator light in the instrument cluster for the 3-2-1 (M) mode when selected
Late "E-7" Models Only (5 Solenoid)
Mode Switch Description
A three position slide switch with Digital display of the three individual positions in instrument cluster (E-S-M). The switch is a momentary contact and spring loaded to a neutral position.
"E-9" Models Only (4 Solenoid)
A two position slide switch for the "A" mode (Economy and "M" mode (Manual). The Sport mode is selected with the range selector inposition 3, 2, or 1 and "A" mode selected. The switch is a momentary contact and spring loaded to a neutral position.
Control units are different too, also the pin numbers are different, older ones have 8 pins till around end 1988, newer ones 7 pins.
Shogun tricks and tips for the E32 series are HERE!
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