Where is the best place to find information about what Ford parts interchange with each other?

I have 2 Ford truck projects at the moment. One is a 77 F250 with a D60,D44,NP205, and NP435 running gear.I am wanting to replace the NP435 with a tough 5 speed. The motor is a 351M400. What would be the best candidate for the swap?Where is the best place to find information about what Ford parts interchange with each other?A trip to the local junkyard should reveal a few candidates. If you can find a late 80's model F250 or heavy duty 150 that has the ZF S5-42 transmission in it, you have hit paydirt. This is a five speed manual that can handle up to 470 lbs ft. of torque at the input shaft, and may be what you are looking for. I can't remember the exact cutoff year but 87-88 had them. You can recognize them by the square plate on the side that is covering the available PTO option. Good luck! It should fit easily to your 351.Where is the best place to find information about what Ford parts interchange with each other?kiubhiui