I collected a few decent T-86 OD's to assemble my 55 F100. I'm running a 53 Flatty. I installed the best looking tranny of the three, connected all the linkage linkage to my 3 on the tree, but It's still in build. I haven't wired the OD soleniod circuit... and I have a few thousand other things to do before I'm pounding pavement. In anticipation however, I've done a few days searching on the board trying to bone up on this old tranny. I've followed the links suggested, and Van Pelt Sales exploded Assy illustrations on early Ford trannies, but I still have some questions... 1) 49 through 54 Car used the same transmission case as the 51 through 55 truck, though I understand there were some improvements in the 51 gearing. I don't see any case part numbers that would help me determine which T-86 (49-55), I installed. Can anybody tell me how to differentiate transmission years to determine which model I have installed? 2) It sounds like the T-86 1st gear was unsyncronized? Were all model years of T-86's unsyncronized? 3) I'm not sure I've ever driven an unsyncronized transmission, however I've shifted through gears by getting the RPM's right without the clutch... I guess that's similar. I suppose what an unsyncronized 1st means is; it's necessarry to come to a complete stop before shifting down from 2nd to 1st. Any other driving tips I need to understand to use this tranny correctly? Lastly; as is typical I flew off half cocked when I started buying up T-86's, and my later research on these old tranny's broadened my understanding of the transmission options available to me behind my flatty, to included the later T85 OD that was developed to the larger displacement YBlocks... 5) Were all the T-85's fully syncronized? 6) I understand from my thread search that; The heavier duty T85 can be identified by its side cover which is curved on the lower edge, but I've never actually seen one which makes looking for one a little more difficult. Does anybody out there have a pic that illustrates the side cover of a T-85 that they could post so I could differentiate the two??? I'd appreciate any schooling you can give me!