[1969k10stepside]

You can swap the whole drivetrain..Use the motor crossmember from the Blazer and move it to a more forward location in the truck chassis as I believe 6 cylinders have the motor crossmember in a different spot.You might be able to use the current 6 cylinder crossmember if it's a 250,don't know.If its a 292 it's a totally different style crossmember.You will also have to move the t-case crossmember and torque mount backward since the SM465/NP205 is longer than a SM465/Rockwell T221 t-case combo.The front driveshaft from the Rockwell will be too short (Especially if you lift it),so use the one from the blazer.The rear driveshaft will obviously be different.The rear output is higher on a NP205 than a Rockwell so you will need a longer driveshaft.Your truck probably has a carrier bearing on the rear driveshaft doesn't it? When swapping in the NP205 you can eliminate that,but will need a longer driveshaft.You could buy one from a K10 or K20 to use or lengthen the one from the blazer.There was one from a 72 K20 somewhere on the East Coast awhile back..New Jersey I believe.The trucks with the NP205 didn't have a carrier bearing d-shaft..You could also use the front axle and get disc brakes if it hasn't already been swapped.You just have to switch the outer stuff on the axle to 8 lug.