few questions on this. there is a 700 in my k5 now that is shot. I have a 700 with about 130k on it and seams to work fine, but on the other side of things i have a low miles on CUCV th400 and np208. Is the 700 and 400 close in size? Also, could i use the driveshafts from the 700/208 to the 400/208 combo? as always thanks for the help Forgot to say, this truck has 4.10s and 35s tires for now. looking to go to 38s soon. Will see highway use too.