Greetings, I want counsel concerning the transmission of my E270 CDI. Below is a comprehensive account of the issue along with pertinent facts that may assist.
Vehicle Identification Number (VIN): WDB2110161A309273
Transmission: 722.640 (variant 04)
The issue:
When the gearbox is cold, the 1β2 upshift might be excessively abrupt and occurs prematurely, approximately at 1600β1700 RPM.
However, when the gearbox reaches a temperature of approximately 80β90Β°C, I have a distinct issue between 2nd and 3rd gear. As the vehicle nears 2000 RPM, the RPM begins to increase autonomously, suggesting a potential loss of hydraulic pressure or slippage in the gearbox, even in the absence of further throttle application. The RPM experiences a little spike and varies for around 2 to 3 seconds until the gear ultimately engages.
The gearbox is unable to maintain pressure or execute a seamless 2β3 shift until it "catches" and finalises the transition.
The ATF was replaced 500 kilometres ago, along with a new filter and connecting plug.
My enquiries:
Should I disassemble the gearbox to examine the valve body or clutch packs, or is it more prudent to seek a quality used 722.640 unit?
Which transmissions are compatible with my vehicle?
Is my vehicle exclusively compatible with the 722.640 gearbox from the 2.7 CDI?
Are transmissions from other engines (2.2 CDI, 3.2 CDI, petrol engines) compatible?
If they are physically compatible, are they also electronically and hydraulically compatible?
Any guidance or insights would be very valued.
I appreciate your assistance in advance!