We are set to release a brand new offering for T45/Tr-3650 transmission owners and users.
As most of you know, the TR-3650 is a 360ft/lbs rated gearbox with a deep 1st gear and a wide gear ratio. It is a bolt-in replacement on the 1998 + up Mustangs with the T45 so this effects a lot of you out there.
The stock 3650 ('01-'04) comes with 3.38 1st and a .67 5th which most of you know makes running a 3.73 rear gear (or deeper) a challenge as you run out of 1st gear almost as soon as you get going.
We are now offering built transmissions with brand new gearsets that are capable of handling 800hp and features a taller 2.90 1st gear and will end in either a .57 or a .53 5th gear. With the closer gear ratios, higher rpm shifting will be easier and more consistent.
It is an entirely different 2nd - 4th gear kit that can be placed in either the 2001-2004 or the 2005 and up 3650's and will support up to 800hp. Plus, it will convert the 1st gear ratio to a 2.90! The overdrive is modified due to the different tooth count on the gears, which actually makes 5th gear either a .57 or a .53 depending on your current overdrive in the factory transmission. If your stock 3650 has the .67 5th, with our new gear set, you would end up with a .57, if your current O/D is the .62, you would end up with a final ratio of .53!
The upgrade would require a 26-spline clutch disc as the input is only available in 26-spline configuration to be able to support 800hp without twisting the splines. You would re-use the stock bell housing, shifter, cross member and driveshaft.
These will be ground cut gears so they will be a little more noisy than the OE transmission but we will be introducing a Helical cut gear in the near future which would reduce the noise to OE levels.
These will be available with a warranty and we have done extensive testing on it with nothing but positive results.