I'm helping a friend repair his 686 I drove it before we pulled it into the shop and it only has one speed in ta or dd I've worked on several hydraulic operated ta's in the bigger tractors but this is new to me I read through the other thread that is currently going on and it's helped a lot. I took off the inspection cover on top and the problem looks obvious, i'm planning on splitting it tomorrow and one of the first concerns I have is when the rails and the bellhousing bolts are removed their is nothing to support the rear of the engine seems odd to me. I plan on blocking it up at the rear of the engine before I split it but still odd. I'll put a pic of what I found under the top cover.