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Old 11-01-2008, 02:41 PM   #1
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Default what gears would i have? they are lowered but to what i dont know

i bought a 89 4speed 5lt f150 and it gets about 100km or 60miles per hour at about 4500rpm so i figure i must have 410s or 430s...what u think?
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Old 11-01-2008, 03:15 PM   #2
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that's pretty damn high. i don't think 4.30 ever came in the rear's of 1/2 ton's. you're not in 2nd gear are you? even with 4.10's that seems too high. my o5 had 4.10's and 30.5" tires and ran about 3500 in 3rd gear with would be close to your 4th. i'm assuming it's a 4 speed standard??? if not that's way too much rpm...
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Old 11-01-2008, 03:26 PM   #3
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used to be a plow truck so im assuming buddy changed them....losed his number so i cant call and find out
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Old 11-01-2008, 03:27 PM   #4
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ya its a 4speed standard....thats why im figureing its 430s
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Old 11-01-2008, 03:28 PM   #5
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didn't know that part...maybe 4.56's. what size tires you running?
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Old 11-01-2008, 03:37 PM   #6
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32 by 12.50
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Old 11-01-2008, 03:41 PM   #7
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play with this formuls a bit. i put in your info with 4.56 gears and only get 2900 rpm at 62 mph
http://www.csgnetwork.com/multirpmcalc.html
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Old 11-01-2008, 03:45 PM   #8
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thats a vegue estimate at best though cause that doesnt say what vechicle it is in...heaver vehicle the higher the rmp....i am leaning towards 4.56 now
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Old 11-01-2008, 03:49 PM   #9
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what does weight have to do with rpm...pretty sure it's dependant on tranny gears, diff gears and tire size. and mph. a light weight car revs higher than a full size truck at the same speed..
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Old 11-01-2008, 04:26 PM   #10
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I'm thinking you are not getting into overdrive. I would count how many times your trans shifts. With your tire size I would guess you had a 5.56 ratio. That's why I think overdrive is gone.
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Old 11-01-2008, 04:26 PM
 
 
 
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