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12-02-2002, 08:10 PM
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Rear gear choice, Gear to Tow
72 C10 Pickup
283ci engine 700 R4 Tranny (3.06, 1.63, 1, 0.7) This will have 31" tires and the current rear is a 3.07. I don't know if that setup will lend itself to hauling well enough. Truck needs to be able to tow 5000 lbs at highway speeds. And yes I know the 283 isn't all that large. But I believe in it!  So taking whereever the power band is in the engine into account, somehow i need to determine the optimal rear gears. Would a 4.10 be streetable? Help! 
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12-02-2002, 08:42 PM
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with that tall a tire and 700R4, the 4.10`s would work, but I believe 3.73`s would also, i posted on your post for running the 307. I`d run it because it has a longer stroke and makes more torque, with the 307 engine, 3.73`s would be okay, but the 283, i`d run the 4.10`s.
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12-03-2002, 02:07 AM
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Is there a site we can go to for info on gear ratios and tire combos? I'm running 33X19.5X15 on my chevelle and rthe gears I have now are like 2.25 in a ford 9". I think the gears should be like 3.90 something for performance. 3.50 for highway. And I'm not sure what the 2.25 is good for except hold the rearend together!
Todd  <img src="confused.gif" border="0">
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12-03-2002, 07:17 AM
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http://www.ring-pinion.com/calculators.shtml#
They have an RPM calculator, which you have to interpret according to your needs, but it works. If you want to know the equations, for fun. Tire Circumfrence (Diamiter x 3.14) divided by (MPH x 1056) times your rear gear (3.73, 4.11 etc) ratio, times your transmission gear (3.06, 2.52, 1, 0.7 etc) ratio gives you engine rpm. Given it will be a little higher because of drag, but hey... its close enough for me.
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