Aftermarket Gearsets in a 6.4 - Ford Powerstroke Diesel Forum
6.4L Performance Parts Discussion What has or has not worked for you?

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Old 01-05-2010, 11:19 AM
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Aftermarket Gearsets in a 6.4

(Mods- forgive me if gear chat doesnt belong in the performance forum)

I've been looking at gearing up from the pitiful 3.73 gearsets in my truck at the moment for quite a while now. I was looking at doing some 4.56's most likely, maybe 4.30's. I have 35's that are on their way out and was going to upgrade to 37's/38's if permitting. Naturally, I have been looking at Spartan for quite some time as I really need something to correct my odometer/speedometer.

What are the thoughts on Spartan Tuning paired with higher numerical valued (lower) gearsets? If you are expecting to go Spartan to people go with a smaller numerical gear rather than a higher ratio? I had 4.88's and 35's on my half-ton gasser and loved the pickup and power. I just dont want to over do it with a hot-rod tuned truck and I know that the extra torque from the diesel can handle the imbalance from gear ratios vs. taller tires better than a gasser can.

Thanks for the input!
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Old 01-06-2010, 08:45 AM
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Anyone have anything?
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Old 01-06-2010, 10:19 AM
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I have 3.73s on my truck with 37s and I def don't feel I need gears. This thing is QUICK! Plenty of pin-you-in-your-seat power and when on the highway and light on the throttle she gets great fuel economy. I don't think gears would be necessary until you went to 40s or bigger. But...it all comes down to personal preference. I haven't heard of anyone re-gearing with 37s or smaller.
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Old 01-06-2010, 11:41 AM
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I did. I went 4.30's. Now I am on here looking to go back to 3.73 or higher. Plenty of power especially if you have it programmed. I dont tow as much as daily driver so want to go back.. I would save the money and go with a programmer unless u live in chitty California.. Anyone out there want to let me use their address that is NOT in cali to register my truck?? haha
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Old 01-06-2010, 01:10 PM
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Interesting. I have 35's on mine, no tuner, and it glugs along from a stop to 40mph. I try to keep the engine at or below 2k rpms when its cold and it just takes forever. I want that low end power back.i never drove a stock f250, so i cant compare it to stock-modified like I could my f150.
What kind of gears do you have in it now? I was gonna go Yukon. luvbigfire, im assuming you have a spartan, what makes you want to go back to 373's?
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Old 01-06-2010, 01:23 PM
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Yukon makes a decent gear.

For what it's worth, my factory Ford gears were noisy from mile 1, day 1. Incorrect setup.

The Ford gears are good units, but they are EXPENSIVE.

Yukon is good, Richmond is good. Stay away from offshore stuff, nothing but problems.
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Old 01-07-2010, 07:48 AM
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yea so ive heard. Lots of bad stories about genuines. made in korea- garbage. I have heard precisions work great as well. I had yukons in my old truck and they were quiet.
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Old 01-07-2010, 07:49 AM
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hillbilly- what would your shop charge to regear with ford gears? I know that the price wouldnt be constant where I am, just looking at ballpark.
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Old 01-07-2010, 08:02 AM
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I always regear these trucks with OEM Ford rear gears and Dana Spicer OEM fronts. With the CORRECT setup they should last a lifetime. Spend the money and do in right the first time, parts and person installing them!
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Old 01-07-2010, 08:05 AM
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We carry both Yukon and Richmond, let us know if we can help!
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