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435 New Process transmission


Not sure if this is the correct place to post this but here goes nothing. 

I tried a search for the 435 and didnt come up with much. 

I just purchased a 1968 F100 300 ci w/the 435 New Process 4 speed  transmission. I dont have a tachometer in the truck and it's pretty noisy in the cab. I'm curious if anyone knows at what mph the transmission can comfortably handle and at what RPM that might look like. I live in a small town so speed around here isnt an issue, but if I wanted to go to town via the highway, just wanted to know what speed I could comfortably cruise at. 


Thanks in advance for any info. 

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