What year is your truck and what year is the vehicle the 429 is from,a winsdor will not bolt to that trans either. If the trans is good that is behind the 429 use it as its most probably a C-6,the only thing you will need to change on the car trans is the shift lever that comes out of the trans. On ford trans they used a different shift arm for each application and all you need to do to change is drop the valve body to get to the big nut that holds it it and if you dont the shift linkage wont hook to it. If your truck is a 67 to 72 you will have to go to a one piece drive shaft as I think they all had 2 piece shafts,if its a 73 to 79 and it has a 2 piece some had the one piece shafts. If you can find a 390 it would be the easiest swap as all you would have to do is just change the motors,let me know the years of the vehicles as I can advise better. Jeff