Gears or no? - Ford Powerstroke Diesel Forum
6.0L Performance Parts Discussion What has or has not worked for you?

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Old 06-20-2013, 11:32 PM
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Gears or no?

I have my axles apart for seals and fluid change. I was wondering if I should do away with the 3.73s and go to a 4.56 gear? I run 38 swampers and it can feel very sluggish and egts climb when on highway going up grades. Always have to put er in tow/haul even when empty to keep it away from 950 on the pyro. Would it be worth it? Or would I benefit more from a better turbo, mine never puts out more than 20 psi wide open with innovative insanity tune. Any input would be aaawesome. Thank ya.
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Old 06-21-2013, 01:03 AM
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Gears! Your truck will feel like you put a better turbo on it and your tranny will thank you
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Old 06-21-2013, 01:03 AM
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Yes! definitely go for the gear change.

4.56 gears would be perfect for 38's, they will do away with the sluggishness and take the strain off you drivetrain which will make it easier on your tranny and also cut down your egt's.

I run 4.30's with my 35" tires and love it!
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Old 06-21-2013, 01:17 AM
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Sweet! Anyone have a preference on which brand to go with? I was looking at G2. I'm sure Yukon is the best by looking at the price tag.
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Old 06-21-2013, 02:46 AM
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Get gears for sure and then get new tunes from a different tuner - you should expect more than 20psi - no wonder you see high egts
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Old 06-21-2013, 02:59 AM
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Quote:
Originally Posted by RoCkfiSh363 View Post
Sweet! Anyone have a preference on which brand to go with? I was looking at G2. I'm sure Yukon is the best by looking at the price tag.
OEM gears may be better. But if you go Yukon, make sure you follow the break in period. It does matter.

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Old 06-21-2013, 07:43 AM
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Originally Posted by GregsSD View Post
Yes! definitely go for the gear change.

4.56 gears would be perfect for 38's, they will do away with the sluggishness and take the strain off you drivetrain which will make it easier on your tranny and also cut down your egt's.

I run 4.30's with my 35" tires and love it!
What RPM's do you run at 70? I'm thinking of re-gearing and am inbetween 4.10s and 4.30s.
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Old 06-21-2013, 08:05 AM
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Quote:
Originally Posted by RoCkfiSh363 View Post
I have my axles apart for seals and fluid change. I was wondering if I should do away with the 3.73s and go to a 4.56 gear? I run 38 swampers and it can feel very sluggish and egts climb when on highway going up grades. Always have to put er in tow/haul even when empty to keep it away from 950 on the pyro. Would it be worth it? Or would I benefit more from a better turbo, mine never puts out more than 20 psi wide open with innovative insanity tune. Any input would be aaawesome. Thank ya.
Mathematically speaking, 4.56s are where you want to be. When it's all done, your speedo should read pretty darn close also. The 38s "sped the truck up" and the 4.56s will "slow it down" so to speak.

The ONLY down side to 4.56s is that if you ever go back to 35s, you're going to be over geared. Not bad in town, but it would be rough on more than 15~20 miles on the highway.

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  #9  
Old 06-21-2013, 08:42 AM
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Don't cheap out on the gears and while you're at it maybe upgrade the diffs too.
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Old 06-21-2013, 08:49 AM
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I run 4.30's with 38's and its ok, at 70 mph I am running right around 2k rpm, and mine is a 7.3. It is definitely great for towing. If you spend any time unloaded and on the freeway over 70 mph you will probably hate 4.56's. There is no way I would put 4.56's for 38's, I would run that with 40's maybe, but I actually liked the 4.30's with 40's combo when I was running that. Wasn't a tow pig setup like that.
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