The truck is a 1965 F100 with the 240 I6 four on the floor. I would like to know if there's a transmission I can put in it that will give me some better cruising. Is there a 5 speed out there for this motor? Or even an overdrive? Am I out of my mind?

I'll probably be having a suggestion thread because you guys have helped me so much already, but now I can really sink some cash into the beast!

 

Lots of different threads on this topic in the past.
Use the forum's Search function to help locate these threads.

Good luck.

 

Whatever trans you swap in...the rear axle ratio will still be the same.

240/4 speed will have a ratio of at least 3.50-1, but it could also be 3.70-1; 3.89-1 or 4.11-1.

Swapping in a ratio of 3.00-1 or 3.25-1 will solve the problemo.

AXLE code stamped on the 2nd line...far right of the Warranty Plate, located on the left door face below the latch.

Post the AXLE code.