I don't know... I really really like my stage 2 trans from Lonnie and don't think the TH400 is necessary. On the power level of a low 10 second car, the gearing on the 200 probably helps the 60ft.
On my trans, we finally found the planetaries to be stripped (almost from original build) This was messed up from the 2nd time I used the transbrake on the car. Basically, the car wouldn't go anywhere on the 2nd pass on the transbrake at each track outing; it would then catch when I let off the throttle and took off and car would still go faster than 130mph. The trans worked fine on the footbrake, so I mistakingly thought I was spinning the radials with not enough shocks. Figured that out so, that's now upgraded that piece anything thing else to billet. Besides that the trans hasn't missed a beat. I made about 10 mid 10 or faster runs last year with 1/2 faster than 10.40.