Update:
Started clean with a completely overhauled transmission.
When using a valve body in which I only worked on the main channel plate (cleaning + replacement of balls and orifices) the transmission shifts like new except for the 1->2 shift.
When using a valve body in which I worked on the main channel plate AND where I have also replaced ALL springs with OEM ZF new ones, the transmission shifts like new except my 2->1 downshift gives me a slight jerk as described in this topic.
This means I am dealing with a valve body related issue. The valve body I talked about previously in this topic is a different valve body. I have 3 valve bodies:
1: Valve body of which the main channel plate has been done, gives me a not-so-smooth 1->2 shift, solenoids show proper ohm resistance
2: Valve body of which the main channel plate and most springs have been done, gives me a 2->1 jerk, solenoids show proper ohm resistance
3: Valve body of which the main channel plate and ALL springs have been done, gives me a 2->1 jerk, solenoids show proper ohm resistance
Valve body 2 and 3 are definately the better valve bodies for all other shift points when compared to valve body 1.
The 2>1 does NOT jerk if:
- The car is in S mode
- The car upshifts to 2 gear but never goes higher than 2. So 1->2 and then 2->1.
Which means the jerk is there if:
- The car is in D mode and has shifted to 3 or higher
The jerk is more apparant the more braking power you apply. An emergency stop from 50 to 0 gives a clearly noticeable jerk. Rolling the car from 30 to 0 gives a less noticeable jerk (but still there)
This 2->1 thing is the final piece of the puzzle!
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Originally Posted by Frank87
