What A Rear End!!!
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What A Rear End!!!
I have a 3.73 in my F-150
3.55 and 4.10 all also available
can anyone in Laymans terms explain the difference and uses for each application.
My ranger has a 4.10
in other words what s the difference?
TIA
Reaver Out
3.55 and 4.10 all also available
can anyone in Laymans terms explain the difference and uses for each application.
My ranger has a 4.10
in other words what s the difference?
TIA
Reaver Out
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Joined: Nov 2003
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Think of it as gears on a bicycle..
a 3.55 would be a higher gear on your bike......the back wheel (driveshaft)goes faster.....but pedal resistance (engine) is harder.
A 4.10 would be a lower bike gear......you pedal easier .....but the back wheel goes slower.........More torque for going up hills etc.
A 3.55 (theoretically) would give you better gas mileage because of slower engine speed........
A 4.10 would give you more "pull"
Mostly "unloaded" without a trailer.....3.55
"Hauling" and frequent trailer pulling.....4.10
Hope this helps!
a 3.55 would be a higher gear on your bike......the back wheel (driveshaft)goes faster.....but pedal resistance (engine) is harder.
A 4.10 would be a lower bike gear......you pedal easier .....but the back wheel goes slower.........More torque for going up hills etc.
A 3.55 (theoretically) would give you better gas mileage because of slower engine speed........
A 4.10 would give you more "pull"
Mostly "unloaded" without a trailer.....3.55
"Hauling" and frequent trailer pulling.....4.10
Hope this helps!
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Joined: Sep 2003
Posts: 347
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From: Holland, Michigan
scottb
you have effectively a 3.10 gear ratio vs actual vehicle speed
3.55 x (30.1/34.4) (the ratio is a function of tire diameter)
if you tow any significant weight, you may want to consider a change in your ratio. otherwise, if you can pull a grade on the highway without pulling out of overdrive, when unloaded, I say you are fine. that is where the low end torque come in use.
jzarwell,
limited slip, does just that. allows the torque to transmit to both rear tires, not just one or the other. my previous truck did not have this and i occasionally would spin one tire pulling my boat out of the water (6,000 lbs) requiring me to stop, put in 4x4, and then pull out the boat.
With my new truck (with limited slip) , it just walks right out. also we took the back way home from icecream one night and did a little sand two tracking. I really like the limited slip in the sand. did not need 4x4 at all.
Ramb
you have effectively a 3.10 gear ratio vs actual vehicle speed
3.55 x (30.1/34.4) (the ratio is a function of tire diameter)
if you tow any significant weight, you may want to consider a change in your ratio. otherwise, if you can pull a grade on the highway without pulling out of overdrive, when unloaded, I say you are fine. that is where the low end torque come in use.
jzarwell,
limited slip, does just that. allows the torque to transmit to both rear tires, not just one or the other. my previous truck did not have this and i occasionally would spin one tire pulling my boat out of the water (6,000 lbs) requiring me to stop, put in 4x4, and then pull out the boat.
With my new truck (with limited slip) , it just walks right out. also we took the back way home from icecream one night and did a little sand two tracking. I really like the limited slip in the sand. did not need 4x4 at all.
Ramb
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Joined: Jun 2003
Posts: 222
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From: Cumming, GA
Yes, and Limited Slip is fantastic for burning out! And in parking lots and stuff, you can cut your wheel and just smack the throttle and let off and chirp your tires like nothing. But that might just be me...351 with a 4.10 LS 
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From: Southern California.. Nea
With almost 35" tires you might want to be looking at say 4.56 rear end ratio to get back near stock performance.. There are tire size calculators that will tell you what you need to get big tires to run at near stock size rpm's.... Mojave
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