[Tom Goldman]

Floyd, I've built a lot of 400's with th ATI brakes,they are fine for a .5 full tree and bracket racing but for .370 pro tree racing with a 400,only the Griner will do. ..they are just that fast,and also have the cleanst ,fastest shifts of any th400 valve body,period. , I ran a Griner brake in a 400 for years ,before switching to a glide,and it was only .015 off his killer mk IV glide brake..........ATI sells them for serious applications,because they know the limitations of their brake........As far as strength,the 400 planets and output shaft are plenty strong, the input shaft hub area in the foward drum eventually becomes the weakest link,altho I've seen some stand up to 900 plus hp in near two ton cars. .....I would say the Griner is worth at least .03 to .05 hundreths over the ATI..........Tom