4.88 third
11-28-2009, 02:28 PM
#41
Registered User
assuming you understand the aspect ratio method of tire sizing I'll skip all that and cut to the chase, your 225/75s end up being about 28.25 inches in diameter, using the chart posted earlier in the thread, you can determine that 4.56 gears with 31s will bring you very close to your stock gearing, meaning your speedometer will be accurate again. However it may not give you quite the same pep as the 4.10s with the 225s because you are spinning a heavier tire. But... 4.88s would end up gearing you a bit low I think, when your speedo says 65, you would only really be traveling 60.6. To achieve the same actual speed, with the 4.88s and 31s, you would have to rev your vehicle about 7 percent higher... so you may see a slight dip in fuel economy, but that would depend on the type of driving you do, and the rpm @ which your engine gets its peak fuel economy... Hope that makes sense
11-28-2009, 02:40 PM
#42
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THANK YOU!!! That's the stuff I've been looking for! I like the fact that I can get the speedo back to normal, but am also looking to gain as much power/accerleration as possible. Would you recommend the 4.56's or the 4.88's for better overall quickness and higher top end highway speeds? Thanks again for your help!
11-28-2009, 05:29 PM
#43
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just got my 31's on today. seemed ok around town.. but i'll see on the highway. i might just end up keeping the 4.10's for a little while. thanks for everyone's help though figuring all of that out!
11-29-2009, 12:13 AM
#44
Here's my say:
Stock was the 28.5" tire and 4.10 gears, 22re, 5 speed, 4wd, xtra cab pickup.
I put 31" mud tires on heavy steel rims with the 4.10's. It was a dog. Drop in gas mileage (city driving) and hard to get up hills. Speedo was reading 7 km/h too slow.
I tossed the 4.56 gears in (still with the 31" mud tires). Speedo was 6 km/h too fast. Great gas mileage in the city (20-22 mpg). I could climb hills no problem, much less down shifting. Engine was definitely revving higher on the highway. It was into the 3k RPM all the time. Very zippy compared to stock.
Current setup:
4.56's 33 x 12.5 BFG A/T on rock crawler steel rims (combo is almost the same weight as the 31" mud tire/wheel combo). Speedo is pretty much bang on accurate. Hills are roughly the same ability as stock. I'm liking this combo because the engine isn't revving as high on the highway. I haven't really tested this setup thoroughly yet, I'm still on my first tank of gas on this combo. I can't comment on gas mileage yet because I recently switched oil weigh which is reeking havoc on my gas mileage (don't ask).
Stock was the 28.5" tire and 4.10 gears, 22re, 5 speed, 4wd, xtra cab pickup.
I put 31" mud tires on heavy steel rims with the 4.10's. It was a dog. Drop in gas mileage (city driving) and hard to get up hills. Speedo was reading 7 km/h too slow.
I tossed the 4.56 gears in (still with the 31" mud tires). Speedo was 6 km/h too fast. Great gas mileage in the city (20-22 mpg). I could climb hills no problem, much less down shifting. Engine was definitely revving higher on the highway. It was into the 3k RPM all the time. Very zippy compared to stock.
Current setup:
4.56's 33 x 12.5 BFG A/T on rock crawler steel rims (combo is almost the same weight as the 31" mud tire/wheel combo). Speedo is pretty much bang on accurate. Hills are roughly the same ability as stock. I'm liking this combo because the engine isn't revving as high on the highway. I haven't really tested this setup thoroughly yet, I'm still on my first tank of gas on this combo. I can't comment on gas mileage yet because I recently switched oil weigh which is reeking havoc on my gas mileage (don't ask).
11-29-2009, 08:12 AM
#45
Registered User
Here's my say:
Stock was the 28.5" tire and 4.10 gears, 22re, 5 speed, 4wd, xtra cab pickup.
I put 31" mud tires on heavy steel rims with the 4.10's. It was a dog. Drop in gas mileage (city driving) and hard to get up hills. Speedo was reading 7 km/h too slow.
I tossed the 4.56 gears in (still with the 31" mud tires). Speedo was 6 km/h too fast. Great gas mileage in the city (20-22 mpg). I could climb hills no problem, much less down shifting. Engine was definitely revving higher on the highway. It was into the 3k RPM all the time. Very zippy compared to stock.
Current setup:
4.56's 33 x 12.5 BFG A/T on rock crawler steel rims (combo is almost the same weight as the 31" mud tire/wheel combo). Speedo is pretty much bang on accurate. Hills are roughly the same ability as stock. I'm liking this combo because the engine isn't revving as high on the highway. I haven't really tested this setup thoroughly yet, I'm still on my first tank of gas on this combo. I can't comment on gas mileage yet because I recently switched oil weigh which is reeking havoc on my gas mileage (don't ask).
Stock was the 28.5" tire and 4.10 gears, 22re, 5 speed, 4wd, xtra cab pickup.
I put 31" mud tires on heavy steel rims with the 4.10's. It was a dog. Drop in gas mileage (city driving) and hard to get up hills. Speedo was reading 7 km/h too slow.
I tossed the 4.56 gears in (still with the 31" mud tires). Speedo was 6 km/h too fast. Great gas mileage in the city (20-22 mpg). I could climb hills no problem, much less down shifting. Engine was definitely revving higher on the highway. It was into the 3k RPM all the time. Very zippy compared to stock.
Current setup:
4.56's 33 x 12.5 BFG A/T on rock crawler steel rims (combo is almost the same weight as the 31" mud tire/wheel combo). Speedo is pretty much bang on accurate. Hills are roughly the same ability as stock. I'm liking this combo because the engine isn't revving as high on the highway. I haven't really tested this setup thoroughly yet, I'm still on my first tank of gas on this combo. I can't comment on gas mileage yet because I recently switched oil weigh which is reeking havoc on my gas mileage (don't ask).
11-29-2009, 08:32 AM
#46
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Here's my say:
Stock was the 28.5" tire and 4.10 gears, 22re, 5 speed, 4wd, xtra cab pickup.
I put 31" mud tires on heavy steel rims with the 4.10's. It was a dog. Drop in gas mileage (city driving) and hard to get up hills. Speedo was reading 7 km/h too slow.
I tossed the 4.56 gears in (still with the 31" mud tires). Speedo was 6 km/h too fast. Great gas mileage in the city (20-22 mpg). I could climb hills no problem, much less down shifting. Engine was definitely revving higher on the highway. It was into the 3k RPM all the time. Very zippy compared to stock.
Stock was the 28.5" tire and 4.10 gears, 22re, 5 speed, 4wd, xtra cab pickup.
I put 31" mud tires on heavy steel rims with the 4.10's. It was a dog. Drop in gas mileage (city driving) and hard to get up hills. Speedo was reading 7 km/h too slow.
I tossed the 4.56 gears in (still with the 31" mud tires). Speedo was 6 km/h too fast. Great gas mileage in the city (20-22 mpg). I could climb hills no problem, much less down shifting. Engine was definitely revving higher on the highway. It was into the 3k RPM all the time. Very zippy compared to stock.
thanks
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