3.27 and 32s - Page 2 - Ranger-Forums - The Ultimate Ford Ranger Resource

Wheels & Tires Semi-Tech General discussion of wheels and tires for the Ford Ranger.
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Old 04-24-2008
TireIron's Avatar
Join Date: Feb 2006
Location: Methuen, MA
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yes, we are saying that with 4.10s and the 32s or 33s your mileage will most likely be BETTER than with the 3.73 and definitly better than with the 3.27s
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Old 04-24-2008
MemphisSenior's Avatar
Join Date: Mar 2007
Location: Spring City, TN
Posts: 331
With that combo (32 tires and 5 speed trans) you will probably only be pulling about 2000 rpm at 70 mph. At those speeds your engine will probably be lugging and might even start pinging. Is that bad? Here's what Tom and Ray Magliozzi had to say.

TOM: When you lug the engine when you try to accelerate in too high a gear you make the engine work harder than it's supposed to. Just like you would work harder than you're supposed to if you rode your bicycle up a steep hill in 21st gear as opposed to first gear.

RAY: When the engine is over-worked, it overheats. The way it overheats is that the temperature inside the cylinders gets too high. When that happens, the gasoline-and-air mixture which is supposed to detonate when the spark plug fires detonates unpredictably at other times, too. That's called pinging when those extra detonations make a sound like marbles rolling around in a coffee can.

TOM: And under the worst of circumstances, you can also get piston slap, which is a "clunky" noise. Because you are getting uneven combustion inside the cylinder (the detonation doesn't necessarily happen at the right time or in the right spot), the explosion can force the piston off to one side when it descends during the power stroke. When that happens repeatedly, the cylinder walls get all scraped up, and over time, your car turns into the proverbial oil-burning heap.

I'd say either go with smaller tires or change the gears to keep the rpm's in the mid 2000 range. You can drop from 2700 at 70 to 2400 or so without to much problems. Any lower and you could be courting problems.
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Old 04-24-2008
Downey's Avatar
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my truck runs at 1900 rpms at 65 and its fine
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Old 04-25-2008
redneckbl89's Avatar
Join Date: May 2007
Location: lincolnton, NC
Posts: 71
im running 31's with 3.27 gears and it is a dog driving on the street. but as far as interstate goes it has no problems. pulls hills good, doesnt slow down a bit and i still get about 21 mpg on the interstate and about 18-19 city. also doing about 70 on the interstate im doing about 2300 rpm.
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Old 04-25-2008
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buddy of mines 2002 edge 4x4 has 4.10 gears factory and now has 33s...he does jus fine...gets like 20mpg he said...and can still leave 2 black marks
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