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  #1  
Old 11-07-2012, 12:17 AM
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Default 4:10 gears

planing on doin a gear swap in the future, but not sure if i should get 3:90s or 4:10s. i know most will say 4:10s, but my truck is my daily for the most part and i do take long road trips with it.

so for the people running 4:10s and 33" tires, what RPMs are you turning on the highway at 75mph?
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Old 11-07-2012, 11:54 AM
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Originally Posted by mr.lopar View Post
planing on doin a gear swap in the future, but not sure if i should get 3:90s or 4:10s. i know most will say 4:10s, but my truck is my daily for the most part and i do take long road trips with it.

so for the people running 4:10s and 33" tires, what RPMs are you turning on the highway at 75mph?
I do not know of the RPM's running 4:10 and 33's, but that is what 09/10 RTs run and use.
But the HP is different in your year of ram and the 4th gens so that 4.10 and 33's will probably run different in your setup

Questions...
will you be towing?
lifting?
drag racing (but still having it as your DD)?
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Old 11-07-2012, 11:58 AM
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mph x gear ratio x 336
__________________ x gear ratio trans
Tire diameter
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Old 11-07-2012, 12:07 PM
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mph x gear ratio x 336
__________________ x gear ratio trans
Tire diameter
That is the exact formula I followed....but I went the next size up as those numbers dont factor in any towing....well at least I think it doesn't.
I dont tow much, but when I do, I DO NOT want to feel a huge loss
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Old 11-07-2012, 02:29 PM
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I have 4.10's and 33's and I'm at about 2150 RPM at 70. My highway mileage sucks though
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Old 11-09-2012, 12:57 AM
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Originally Posted by fastNugly View Post
I do not know of the RPM's running 4:10 and 33's, but that is what 09/10 RTs run and use.
But the HP is different in your year of ram and the 4th gens so that 4.10 and 33's will probably run different in your setup

Questions...
will you be towing?
lifting?
drag racing (but still having it as your DD)?
that and the new rams have different gear ratios in the trans im sure

for the most part it is my daily and do plan on taking long road trips (1300+ miles) and plan on actually off roading it unlike a lot of trucks
wont be lifting it too much if i do, but at that it dont change anything with the gears
i also plan on converting it over to a manual trans when i can find a parts truck with one
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