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Message: <blockquote data-quote="will e" data-source="post: 409084" data-attributes="member: 442">I added a link in my previous reply.  They are an independent company that creates an 'overdrive' unit that is attached to the transmission.   The unit itself is pretty standard and they have dozens of different adapters for various transmissions.  The stock tailshaft is removed and the adapter and overdrive unit are attached.   The drive shaft will need to be shortened.    There is some electronics involved but it's pretty easy stuff.    The overdrive unit is self contained and does not require any connections for oil or cooling.    It's a planetary gear system with a clutch plate.  The spinning of the unit creates the pressure and a solenoid is used to activate the overdrive.   The unit can be activated at pretty much any speed over 25 or so MPH.   It provides a 22% overdrive.   The electronics can activate it for you or you can use a switch.   It deactivates itself whenever the speed of the car gets down to about 22mph.There are many advantages and disadvantages to this compared to an AOD swap.  I think it's easier to install.  I did mine on my garage floor.   It uses the factory transmission mount location. I kept my already built C6.  The shifter continues to work as normal. Used with a C4/C6 the first gears is a bit steeper than an AOD (faster holeshot) but the FMX first gear is very similar to the AODThe AOD does have a greater overdrive so it will slow down the RPM's a bit more, this might provide the difference between say 3.5 and 3.73 gears for the same RPM cruising range.  The gearvendors can be engaged at any speed above 25mph or so regardless of what gear the transmission is in.  This allows 'gear spitting'.   You basically end up with 6 forward gears but in practice I don't split gears every time.  (Kinda like folks with 6 speed manuals don't always go through all of the gears). I like to split 2nd to 3rd sometimes if I an getting on it.    I also like the passing gear I get when going from 3rd to 2nd with the overdrive engauged. For me it made sense.  I had a built c6.  I didn't want to mess around with flexplates, shift linkages, possible exhaust interference and such.    If I had an FMX I might have gone the AOD route just because FMX has less support than the c4/c6. Price wise it was kind of a push.  10 years ago or so when I installed the gearvendors the cost to convert to AOD vs GV was pretty close depending on how you did the math and if you wanted to do the labor yourself.</blockquote>

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