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Custom Dodge Ram Performance Mods - Engine - 4.7 Liter V8 Discuss modifying your Dodge Ram with Performance Parts and Accessories!
Factory Spec: 4.7-liter V8 engine - 310 horsepower, 330 lb-ft of torque.


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  #11  
Old 01-12-2012, 11:52 PM
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snrusnak snrusnak is offline
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Engine: 2008-20?? 287ci (4.7L) PowerTech V8 310hp 330lb/ft
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Since the 4.7L is a smaller engine and has less torque than the hemi, higher numerical gearing is a way to compensate and make up for this. It's like riding a multi speed mountain bike, if you are in a low gear it is extremely easy to pedal at low speeds, but is very hard to go fast, but if you are in a high gear it is extremely difficult to pedal at low speeds but very easy to go fast. The 4.7L is more of a high revving engine, so it makes some sense to have higher numerical gearing vs the hemi, but IMO 4.56 is too much (depending on tire diameter). I would like to go to 4.56, but I think it'd kill my mpg.

Gearing is a way of torque multiplication. If you have 100 lb ft of torque at the rear of the transmission and have 3.55 gearing then you have 355 lb ft of torque at the wheels. By simply changing to 4.56 gears you now have 456 lb ft of torque at the wheels...
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  #12  
Old 01-19-2012, 06:01 PM
rs182 rs182 is offline
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Vehicle: 2002 quad cab 1500 4x4 4.7
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Engine: 2002-2007 287ci (4.7L) PowerTech V8 235hp 295lb/ft
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I installed 4.56's (well a whole gm 14bolt and dana 44 to be honest) in my truck and it made a world of difference. I also installed the jeep 5-45rfe TCM (since my truck is an 02). That coupled with 305/70/16's made for a pretty nice overall set up with much more power and better fuel mileage than I was getting before
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Old 01-19-2012, 06:55 PM
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what i found online

Chrysler 9.25
Application: 1500, 1500 4x4 All Engines

Capacity: 3,900 lbs
type semi-floating
Ratios 3.21, 3.55, 3.92
Ring gear diameter 9.25"
Ring gear face width 1.375"
pinion mounting overhung
pinion shaft diameter 1.88" inner
1.31" outer
Differential pinions two
axle shaft material Induction Hardened
diameter at bearing 1.62"
axle spline pitch 1.29"
Spring Centers 44.50"
Fluid capacity (2/4WD) 4.75/4.75 pints
wheel bearings Cylindrical Roller
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