Quote:
Originally Posted by mrein3
Contrary to what many above have posted, you can tow all day long with a 700r4, just don't use overdrive. 3rd gear in a 700 is the same 3rd and final gear in a th350. If you are running a tranny cooler and watching your temp you can tow just as much as a 700r4 in 3rd as you can in a th350.
Overdrive on a 700r4 is .7 to 1. In other words you have a 30% drop off in your rpms when on the freeway in OD. (Not exactly but close enough for state work).
ALL factory rear end gears are 10% different then the next size. To go from a 4.11 to a 3.73 rear you will have 10% less rpms at the same speed as the guy with the 4.11. 4.56 to 4.11 is 10%. 3.08 to 3.43, 10%. 3.43 to 3.73, 10%.
Change two gear sizes is 20% (not exactly but again close enough for state work). Three sizes is close enough to 30% to just call it 30%.
SOOOOOoooo...
If you have 4.11s now and switch to 3.08, you achieve effectively the same change in highway rpms as getting a 700r4.
Switching from 28 inch tall tires to 33 inch tall tires will decrease your highway rpms approximately 20%.
What do you want to do with the truck? All this stuff costs money. If you drop $1000 on a new tranny, how much gas can you buy for $1000? How long does it take to "get back" your investment? I've driven 2000 miles in 4 years in my truck. 200 gallons over 4 years is real hard to justify a 700r4 just to save money.
A Prius that gets 50mpg? I've don't know anybody who gets over 35mpg in their Prius'. Or are two Prius' referred to as Prii?
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Thanks everyone for your comments and help.
mrein3
I use this truck as a daily driver. I haul nothing and never tow. I drive about 100 miles a day sometimes less. All freeway. Right now I am getting about 11mpg and I have a 20 gallon tank. Is the 700r4 on Ebay? It looks like it is.
I just cant do it myself is the prob. I would like to get 15mpg if possible. I have new tires and wheels now. 265/75-16 radials. If I change the gearing to a 3.73 do I need to get a bigger housing?
Maybe it just needs to be left alone. I just hate getting only 150 miles to a tank of gas. (approx 150 miles)
Chad