another 5.0 question...
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Senior User
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From: Tulia, Texas
another 5.0 question...
hey guys its been a while since ive last posted but i have more questions!!..i have an '88 F150 single cab long bed i just bought and it has the 302 with a 5 spd manual with stock 3.55 gears and i first was wondering what heads this '88 has? another question is when its in overdrive with these 3.55's im at 2500 rpm at 70mph and i dont remember the rpm's being that high in a similar truck i had with the same gearing and an automatic at the same speed ,is it all to do with the standard transmission? ive heard conanski tell folks that the 5.0 needs atleast 3.73's but i could only imagine what it would do with the rpm's then at 70mph..i want this truck to be a cruiser aswell as have a little get up and go oh and im also going to go with 275/60r15 tires so that will affect the over all gear ratio with a shorter tire so what do you guys think? stay with the 3.55's or go lower?
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From: Tulia, Texas
i jacked it up and counted and i got 1.75 revolutions on the driveshaft to 1 full revolution of the tire
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A common mistake, the reason the number of turns is so low is because of gear multiplication through the differential spider gears.
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From: SoCal
If you just jacked up one side (with an open differential), you can just double the number of drive shaft turns to a single wheel turn to get the ratio. If you say you got 1.75 turns of the shaft to make one turn of the wheel on one side, then your axle ratio is about 3.5, or 3.55 is the specified ratio.
Sometimes you can't jack up both sides of an open differential to count turns; if one side has even slightly more drag than the other, both wheels will not turn the same amount, and it will be very confusing try to count their turns.
You can do this with a working limited slip differential; both sides are soft locked by a clutch pack and pre-load springs on the clutch plates, so they will turn together.
Sometimes you can't jack up both sides of an open differential to count turns; if one side has even slightly more drag than the other, both wheels will not turn the same amount, and it will be very confusing try to count their turns.
You can do this with a working limited slip differential; both sides are soft locked by a clutch pack and pre-load springs on the clutch plates, so they will turn together.
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