As we all know the Tamiya tt-01 is a great chassis to begin with as well to compete. Many of you guys that are new owners have many questions regarding; how to set it up to drift, what hop-ups to buy, and etc.... Well I will share as much knowledge possible here on this thread to help you all out.
There are four models of the tt-01:

-TT-01
Basic abs tub chassis, friction shocks, bushings on all drivetrain, stock can motor (27t)

-TT-01D
Basic abs tub chassis, oil dampening shocks, adjustable upper arms, ball raced, motor heatsink, sports tuned motor (25t), tamiya type-d compound drift tires

-TT-01R
Basic abs tub chassis, oil dampening shocks, adjustable upper arms, ball raced, aluminum center shaft and cups, motor heat sink, gt tuned motor, rear 2 degree toe-ins, includes tune spur gear set 55t and 58t.

-TT01 type E
New design, still abs tub chassis, friction shocks, ta05 steering bell crank, upper frame for less chassis flex, two peice bulk heads with seperate shock towers and adjustable shock position, and stock can motor.
Whats needed to make it drift? For the basics, this is what it takes to drift:
-Drift tires:
If you are cheap you can start off with abs 2" inner diameter plumbing pipe, or HPI type-t drifts, and Tamiya driftech tires.
-Lock differentials:
The tt-01's all come with planetary gear differentials, for most drifters. Its common to lock the rear diff, or buy a spool. For the front, you can run an adjustable ball bearing differential or a front one way unit. The ball bearing differentials cost around $35 by tamiya, but 3racing has them as well for half the price. If you really cheap and cant afford. Buy some CA glue, clean off all the bevel gears inside the diff and glue them together for a permanent lock. If you decide you dont want to do a permanent lock, you can use fuel tubing used on nitro cars, and cut small peices to jam between the bevel gears. Locking the diffs will help break tractions on the tires, so the chassis will go sideways easier.
Many TT-01 drivers asked, what hop-ups should I buy?
For most if you buy the TT-01 basic, or Type-E. You should upgrade to the following list down below, as for the TT-01D all is needed is an aluminum center shaft:
*= you need this!
-ball bearings * ( stock bushings tend to heat up and melt into the axles)
-aluminum propeller shaft * (stock plastic shaft wobbles and lose power from the motor to the drivetrain)
-adjustable upper arms * ( will allow the tt-01 to be tunable by adjusting camber on tires)
-metal motor mount * ( Needed if running a motor 19T brushed or lower, and 10.5 brushless and lower)
-carbon upper frame ( Stiffens the chassis for less chassis flex)
-rear toe-ins (will increase stabillity on a straightaway)
-adjustable steering turnbuckles (adjust front toe-in/out)
-front/rear sway bars ( Help increase tractions on a turn)
-adjustable ball bearing differential (adjust the tension on a diff for the amount power to distribute into the wheels)
-tamiya ball raced steering arms ( More precise and smoother, also reduced the sloppy stock steering arms)
What gearing should i run to drift? Here's a gear chart to help you out.

Depending on what motor you run, if you are stock 27t down to 20t. Just run stock gearing 61t/19t. For most brushless applications a 7.5 final drive would be a good start off. The smaller the pinion the more torque you will gain but lose top end speed. So its vise versa, the bigger you go on the pinion gear the more top-end speed but less bottom end torque. Be careful not to over gear your motors.
original poster: dorkymk3