A few weeks ago i changed oil and filter of an automatic transmission from a friends W126. He had troubles with hard shift and slipping gear. For that reason we also replaced the K1 and K2 springs. He ordered the parts as i have no experiance with this K1 and K2 spring kits!
It turned out to be a major improvement for the transmission. It shifts very smooth now, almost perfect.
When i am going to change oil and filter for the E500 and 400E i want to replace the springs also and hope to get an improvement in shift too. Also as a "while i am in there" thing.
What i know about the spring kit is:
The K1 spring kit (new type) is universal and has partnumber A126 270 4477
That should fit in our transmissions?
The K2 spring kit has multiple partnumbers: A126 270 xx35
Witch one should i order for our transmissions?
I searched the forum for this subject but could not find anything pointing to this partnumbers?
The costs of the kit's ordered at the dealer are under $10 each, so that is why i think it is worth it to replace them?
From Gsxr's site: