What brand of gears to buy? - Ford Powerstroke Diesel Forum
6.0L Performance Parts Discussion What has or has not worked for you?

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post #1 of 10 Old 04-30-2009, 09:47 PM Thread Starter
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What brand of gears to buy?

I'm looking to regear my truck to 4.56 gears and was looking for some input on what brands are recommended? When I tow I tow a 16K fifth wheel.

2003 F350 C/C LB FX4 6.0L, 4wd, 8" lift on 37" Xterrains, 4.56 gears, Mag CAI, zoodad mod, high idle mod, Sirius radio, 4" straight pipe to 5" dumping out in front of rear tire

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post #2 of 10 Old 05-01-2009, 07:01 AM
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I went with a Yukon gear from Randy's ring & pinion. The Yukon gear has always been reliable and shows little wear with high mileage pulling heavy loads, and is by far the most quiet. How do you fit under your 5th wheel with that size lift and tire?
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post #3 of 10 Old 05-01-2009, 07:32 AM Thread Starter
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It is a little high in the front but tows ok. The trailer is a Gear Box so the axles are flipped. My trailer is 13'6" at the top of the A/C unit when it is hooked up to my truck. I'm planning on building some traction bars with built in blocks and dropping the rear of the truck about 2" so the trailer will ride a little more level.

2003 F350 C/C LB FX4 6.0L, 4wd, 8" lift on 37" Xterrains, 4.56 gears, Mag CAI, zoodad mod, high idle mod, Sirius radio, 4" straight pipe to 5" dumping out in front of rear tire

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post #4 of 10 Old 05-01-2009, 09:34 AM
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I like Ford's gears. They are one of the better options as far as noise and longevity. The Ford 4.30 R&P is also a really good choice, with the diesel you really don't have to gear it as low as you would a gasser.

2006 F-250 4x4 ecsb, Elite stage 2's, VGT-SSX.
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post #5 of 10 Old 05-01-2009, 02:05 PM
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Ford gears will be quieter, but Yukons are quite a bit cheaper and are very good gears. I put 4.30 Yukons in 5 months ago and they're great. Why are you going with 4.56? With 37s, 4.30s will put you back to stock ratio. 4.56s will put your RPMs pretty high running on the highway, similar to my 4.30s with 35s. Unless you plan on going to larger tires later I'd go with 4.30s.

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post #6 of 10 Old 05-01-2009, 07:14 PM Thread Starter
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Thank you for all the good info so far.

2003 F350 C/C LB FX4 6.0L, 4wd, 8" lift on 37" Xterrains, 4.56 gears, Mag CAI, zoodad mod, high idle mod, Sirius radio, 4" straight pipe to 5" dumping out in front of rear tire

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post #7 of 10 Old 05-01-2009, 08:09 PM
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I roll with the 4.30's and 33'' tires. It is not my daily driver so I really enjoy the the low gearing for pulling my 5th wheel. They are great for head winds and mountain passes, you do lose a little mpg empty but gain it back pulling. With your big tires and 5th wheel your tranny will thank you. I live about 70 miles south of you in San diego, and we are both surrounded by mountains and killer winds so you will really appreciate the low end grunt.
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post #8 of 10 Old 05-01-2009, 08:17 PM
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yeah i would run 4.30's cause its a ford product. i run 4.30 and love it.

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*03 Turbo*Stroked Injectors*AFE Stage 2*Small mouth Intake*SCT With Eric's Extreme Race*4.30 Gear*Best ET 13.5@99MPH*
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post #9 of 10 Old 05-01-2009, 08:17 PM
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4.56's bring you to stock with 37's. That is what I did and I have no regrets. Don't do anything but yukons

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post #10 of 10 Old 05-02-2009, 03:15 AM
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Quote:
Originally Posted by humboldtstrokin' View Post
4.56's bring you to stock with 37's. That is what I did and I have no regrets. Don't do anything but yukons
No, 4.30s are closer to stock.

31.6" x 4.30 / 3.73 = 36.4"

4.56 are 6% lower, which would put you a little over 2000 rpms running 65 mph.

2012 F-150 XLT Ecoboost SuperCrew 6.5' 4x4
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