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6.2L V8 Discuss the 6.2L V8

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Old 03-12-2013, 09:07 PM
goldglove goldglove is offline
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Another gearing ?

I think I have read every thread on here on gearing and fuel mileage. I'm looking at ordering a new truck Lariat F350 8 ft box, 4x4,camper package, 18" wheels and a few other goodies. Trading in a 08 F250 V10 with 4.10 gears 5 Star tune running 87 performance for about 150,000 miles rest of the truck is the same as the one I plan on ordering. I pull open trailers occasionally anywhere from 4000 to 9000 lbs and will throw 2500lbs of feed in the bed and drive to south Texas.
All the threads I read everyone posts up numbers running 60 to 65 showing good numbers on mpg I run 75 to 80. I'm planning on ordering with 4.30 just don't won't to kill the mpg's I know slow down but you can get run over here on these freeways in Houston and the speed limit on the highways is 75mph.
As of right now the truck I have numbers on has 4.30 but I can change that when I call to tell them to go ahead and order just don't now if 4.30's or 3.73's are the way to go........sorry to keep beating a dead horse but help a brother out.
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Old 03-12-2013, 10:56 PM
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If mpg's are a concern, the 3.73's will do better (which I'm sure you're aware of). Either gear sets will move that weight, the 4.30's will be a bit quicker.

What's more of a priority to you? The savings in gas or a little bit of extra grunt? You gotta pick, you can't have both.
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Old 03-13-2013, 01:33 AM
WhiskeyTangoFoxtrot WhiskeyTangoFoxtrot is offline
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If you're buying it to tow/haul, get the 4.30 for the max. GVWR rating. You can always swap out for the 3.73. That is, if rating means anything to you. Sounds like you're under 10,000 anyway.
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Old 03-13-2013, 08:30 AM
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If it were me, and I'm going to be dragging around anything that's not in the bed, then it would be 4.30's.

The 4.30's will give you better mileage and less tranny/engine strain when accelerating while towing. And if the trailer isn't aerodynamic, even more so at highway speeds.
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Old 03-13-2013, 11:19 AM
8iron 8iron is offline
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A while back I did a comparison of the two rear ratios for given speeds. I used an online calculator that asked for final drive, tranny ratios and tire diameter (I used 18" stock dia of 33.17")
1st gear @ 20mph 3.73=3002rpm/4.30=3461rpm
2nd gear @ 30mph 3.73=2631rpm/4.30=3033rpm
3rd gear @ 40mph 3.73=2299rpm/4.30=2650rpm
4th gear @ 50mph 3.73=2174rpm/4.30=2506rpm
5th gear @ 60mph 3.73=1951rpm/4.30=2224rpm
6th gear @ 70mph 3.73=1773rpm/4.30=2044rpm

All this shows is rpm @ given speeds and doesn't take into account real world rpm necessary to move a load at the given speeds...it shows that basically the 4.30 diff will run 1 gear higher than the 3.73 at the same speed after 1st gear. You folks can take this fwiw.
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Old 03-13-2013, 11:26 AM
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What about 4.10 hears ?
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Old 03-13-2013, 02:08 PM
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N/A on the 4.10 unless you go aftermarket.
Just get the 4.30's. It's not going to kill your mileage.
Like Matt said, you want a little extra go or an extra 1-1.5mpg?
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Old 03-13-2013, 02:41 PM
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4.30 all the way. I've got a '12 with 3.73 and 35" tires, I wish I had the 4.30 ratio.
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Old 03-13-2013, 04:32 PM
goldglove goldglove is offline
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Thanks everyone for the comments. Just made the call and ordered the truck.
F350 4x4 crew/c 6.2L 172" wb
Sterling Grey
LTHR 40/cnsl/40
Black Int
Lariat
Trailer tow pkg
Sony prem audio
LT275/70bswat18
5"Chrm cab step
Camper package
Body side molding
4.30 gears
Sure wish they would bring back medium wedgewood blue this is three in a row on grey trucks for me, just don't like the colors much. If this truck is as good as the V10 has been I will be a happy man.
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Old 03-13-2013, 04:32 PM
 
 
 
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