have run as quick as 126 mph in the 1/8 and 157.5 in the 1/4
the only time I have had problems with the clutches was when I had the small feed hole feeding from the front stator on the back of the pump after opening up the hole all was well . this also applies to the cummins Trucks with high boost. They started burning the clutches. So we started to open them up and fixed that problem also.
Just something to look at I am sure the trany is strong enough if you have the right parts in it.
I have a steel splined planetary, aluminum front drum ,bolt in sprag,roller rear drum. and a hipster valve body, modified pump stator.heavy duty clutch apply rod and 4.2 ratio band apply lever
pretty basic but works good so far.
