My Viano's transmission has failed funtion. For last coples of week there is several times the 4th gear loss power when I drove it. After the repair there are more problem, which is not working at all. So the transmission only working in one gear, some times 1st gear or 2nd only. R transmission is working. I don not have any idea waht happend with it. HELP......Then I decide to replace the parts. The body valve I looking for is not available. If some one can advice me on my problem will be greatly appreciate.....what actually happend with my car's transmission and what steps should I do before I decide to replace the transmission? Thanks.