3.55 to 4.10 gears?
#1
10-11-2006, 09:12 PM
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3.55 to 4.10 gears?
I'm buying a 96 F350 quadcab 4x4 with a 7.3 that has 3.55 gears. I have a set of axles from a 95 F350 4x4 with a 460. The 95 axles have 4.10 gears. I bought them to resell, but now I'm thinking that maybe I shoud keep them. Should I swap them in? With a diesel you want the lower RPM, right? My new (to me) truck will rarely move without a trailer. Sometimes that trailer will have little weight on it and sometimes it will have 8000lbs on it. I do care about fuel economy. Average trip will be about 2 hours each way.
#2
10-11-2006, 10:01 PM
Go here and plug in your ratios and tire sizes to find the rpm/mph combos you will have before and after the change.
http://www.novak-adapt.com/knowledge/gearing.htm
http://www.novak-adapt.com/knowledge/gearing.htm
#4
10-12-2006, 08:01 AM
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#5
10-12-2006, 08:39 AM
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well if you already have the axles and dont mind wrenching on the truck then i would say ya go for it. i think 4.10 maybe 4.56 are good ratios for a diesel. our powerstrokes like the high RPM's, they run cooler, the powerband is better in higher RPM's, you wont lug it on long hills as easily, and you'll actually get a lil better fuel economy.
also, what tires do you plan to run? if you are gonna run stocker 235's then 3.55 may be ok but if you run 285's-315's definitely go to the 4.10s
-cutts-
also, what tires do you plan to run? if you are gonna run stocker 235's then 3.55 may be ok but if you run 285's-315's definitely go to the 4.10s
-cutts-
#6
10-12-2006, 01:51 PM
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ive got 4:10s, a 5 speed and 285s. Its actually pretty crappy for around town because my first gear is so slow, and it takes just a bit too much riding the clutch for my liking to start in 2nd.
On the highway its beauty, 1890 rpm to go 60 mph (100km/h) and its great accell through all the gears...except first where it goes from idle to redline in a half second which just feels like one big jerk. Since youre going to be towing, lower gears are always better and 4:10s will still get decent mileage on the highway. I say swap em in.
On the highway its beauty, 1890 rpm to go 60 mph (100km/h) and its great accell through all the gears...except first where it goes from idle to redline in a half second which just feels like one big jerk. Since youre going to be towing, lower gears are always better and 4:10s will still get decent mileage on the highway. I say swap em in.