Tremec 3650 Cold shift issues Wow! cant believe what i am reading. I have a 2005 GT convertible, love the car, a bunch of Steeda mods added to it from the previous owner, I have had this car for about 18 months. I started to notice the shifting was difficult when cold but thought it was the Tri ax shifter and did not pay too much attention to it. After about 10 minutes, as it warmed up the problem went away. When the tranny is fully warmed up, it changes gears very nice with no crunching but I do have a little noise from the bearing and general noise from the tranny.. This winter here in Virginia it has been colder than the previous year and the gear shift was becomnig annoying. I done the whole Ford thing, they just told me there was nothing wrong with it and charged me near $50 dollars for their trouble. Reading these threads it seems the 1st to 2nd shift problem is common with this tranny. Anyway I have managed to get hold of a 2007 tranny new and am having mine replaced this weekend at performance autosports. I will be installing a stage 1 spec clutch and alloy flywheel at the same time. I am going to replace the shifter with a new one and a new slave cylinder as well. I think I will take the previous advice and put the Mercon 3 fluid in instead of the current purple and have it filled to 3.2 litres. Watch this space for an update, hope it works!!