isnt a c4 the only 4 speed ford made for these trucks and they were not as strong as a c6 i know the 300 i6 is built for torq i think it pulls my dads 21 foot boat better than my 95 cummins ram but if i was to put in a 4 speed and keep the i6 would it still be strong enough to pull whatever i ned something that aint gona wind out so bad because when i take my foot of the gas the truck slows down real fast and if the 4 speed is the way to go what do i have to do to put one or will mount right. Thanks for all your help daniel