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Old Dec 30, 2011 | 01:08 AM
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Cruising

What rpm should my truck be doing at 60 mph. 360 with4 barrel edelbrock 4 speed
 
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Old Dec 30, 2011 | 01:16 AM
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Depends on gear ratio in the rear, and tire size. Could be anywhere from ~2000 rpm to 3000 rpm.
 
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Old Dec 30, 2011 | 01:29 AM
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Everything is stock the tires are 265 75 16. The engine seems to be working so hard to just cruise on the highway
 
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Old Dec 30, 2011 | 01:40 AM
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Do you have the warranty plate info it will tell us the gearing?
 
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Old Dec 30, 2011 | 09:58 AM
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16" tires, I'm guessing that means it is a F250 or F350. Typically, these had 3.73 or 4.10 rear gears.
 
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Old Dec 31, 2011 | 12:52 AM
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Sorry I didn't check the warranty plate but it's an f250. I got her up to 60mph with around 3000 rpm
 
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Old Dec 31, 2011 | 01:27 AM
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The AXLE code is stamped on the Warranty Plate, located on the left door face below the latch.

If 8 lug 6.50" bolt circle wheels are present, it's either an F250 or F350.

265 75 16 is not the original tire size, it's a P-Metric radial. P-Metrics were not offered until the late 1990's for Ford trucks.

Radial tires were not even available from Ford for F100/350's until the mid 1970's, and then were optional over the bias ply tires commonly used then.

Original 16" tire sizes for 1973/79 F250's and F350's with SRW would have been: 7.50-16, 8.00 x 16.5, 8.75 x 16.5 & 9.50 x 16.5 for Camper Specials.
 
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