Gears and 37s
Logistics Pro
Joined: May 2004
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GEARS GEARS GEARS
I run 4.56's with 37's. Towing is PERFECT. Don't be that guy that runs around with 37+ tires and say..."the motor is powerful enough, it'll push it." Your transmission will eventually die.
I wanted to laugh. I walked up to a truck (F250) raised to the hilt. Big A$$ tires (atleast 44"). I got to talking to him, asked about gears.....he said "I have never changed them from stock 3.73's."
I run 4.56's with 37's. Towing is PERFECT. Don't be that guy that runs around with 37+ tires and say..."the motor is powerful enough, it'll push it." Your transmission will eventually die.
I wanted to laugh. I walked up to a truck (F250) raised to the hilt. Big A$$ tires (atleast 44"). I got to talking to him, asked about gears.....he said "I have never changed them from stock 3.73's."
Senior User
Joined: Dec 2006
Posts: 201
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From: Tustin, CA
A local place will replace them in SoCal for about $1600.
joe blow, what are your rpm's vs speed on the freeway? I do not tow.
I have 38's with 4.10's, but am thinking about a move to 4.56's and 40's.
joe blow, what are your rpm's vs speed on the freeway? I do not tow.
I have 38's with 4.10's, but am thinking about a move to 4.56's and 40's.
Logistics Pro
Joined: May 2004
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I wanna say @ 70mph (really 78 according to GPS) 2200-2300 rpm. I was really into checking at one time, but not anymore after I've been running them for 5 years now.
It is a comfortable speed and RPM.
If you do not tow, 4.56's would be awesome with 40's. I would venture to say, I am a tad lower than stock ratio...which is cool. I tow a 37' 5th wheel and a larger boat. It works for me. Trans runs COOL. Never hot
It is a comfortable speed and RPM.
If you do not tow, 4.56's would be awesome with 40's. I would venture to say, I am a tad lower than stock ratio...which is cool. I tow a 37' 5th wheel and a larger boat. It works for me. Trans runs COOL. Never hot
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Tuned
Joined: Apr 2007
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Joe I got a quote for 1450 for 4.30 or a couple hundred less for 4.56. So you think 4.56 would be the way to go with 37s? What kind of mpg you getting? And is RPMs that high ok for long distance drives?
Senior User
Joined: Dec 2006
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From: Tustin, CA
From my understanding, 4.56's would get better mileage in city driving, since there is less drag on the drivetrain/motor. I am yet to drain my first tank w/4.10's and 38's. I will know next week what my city driving mileage is starting out to be.
Logistics Pro
Joined: May 2004
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4.30's are an odd gear ratio, probably explains why they cost more.
I really don't worry about my MPG. Around town (unloaded) I run a 100HP tune. Although I do not hotrod, I do allow the motor to rev through the gears which obviously diminishes my MPG. In stock form (how I tow) I get great gas mileage. I couldn't tell you how great but it is good enough towing my big loads.
I really don't worry about my MPG. Around town (unloaded) I run a 100HP tune. Although I do not hotrod, I do allow the motor to rev through the gears which obviously diminishes my MPG. In stock form (how I tow) I get great gas mileage. I couldn't tell you how great but it is good enough towing my big loads.
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