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So, I don't have a FSB anymore, BUT I do have a 1978 F-250 4x4 with a 400m and an SM-465 transmission. I wanna go with a 5 speed because my truck has 4:10 gears and a 4 speed so it tops out at 70mph. I want to be able to do 65 at a fairly low RPM compared to the 3500-5k I'm doing now (no tach doing by ear)

What would be the best transmission to put in it? I wanna do a ZF 5 speed...

Ben
 

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SM465 is a chevy trans. I doubt it is behind ur 400
 

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I would think it would be a t-18 or np435. I doubt you are running even 3500 let alone 5000rpm. Even with just 31" tires 65mph is 2800rpm with 4.10s.
 
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