Could someone please send me the link that tells what year of 60,s to 70,s trucks that have a rearend that will fit into my 51 f100 the easiest and best for crusing speeds?????

 

Here's one of the many links for this subject - found it using the search function. See the article listed by Ilya in post #3.

https://www.ford-trucks.com/forums/9...-the-rear.html

For freeway cruising with (I'm assuming) the flathead V8 and 16" wheels 3.25 is about perfect.

 

thanks for the info