This was a new replacement unit only on the car for about five years before the 1980 transmission was removed. RED MEANS RED. Only works if your current transmission has a red modulator THAT LOOKS EXACTLY LIKE THIS ONE. Will also work on some 80-81 W123 240's. Kent installed a new cap o-ring and thoroughly bench tested this unit. To get this to work right you MUST understand how the vacuum system works on those models. It is VERY FINICKY!. SEE MY manual below.
Product Details
On the 1980 and 1981 non-turbo models, there is no Bowden cable or pressure control rod to control shifts. Everything is controlled by the modulator - both shift timing and smoothness. If your modulator has failed you will never get the transmission to shift properly!
PLEASE NOTE: THIS IS A FINAL SALE. THIS PART IS NOT RETURNABLE. MAKE SURE YOURS MATCHES EXACTLY BEFORE ORDERING
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Diesel Automatic Transmission PEAK Performance Tuning Manual by Kent Bergsma
I have received so many emails on this topic that I had to sit down and write a very detailed manual over 130 pages in length! Let's face it! Diesel automatic transmissions can be troublesome, particularly those models that use vacuum to control shifts.
123 126 Diesel Transmission Ultimate Diagnostic and Tuning Kit
INCLUDES TRANSMISSION PEAK TUNING MANUAL. DO NOT ORDER SEPARATELY