iso front and rear gears for a 7.3 to handle 38s - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 11 (permalink) Old 04-26-2014, 05:30 PM Thread Starter
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iso front and rear gears for a 7.3 to handle 38s

I need gears to handle the 38s in my truck anyone have some good suggestions for gearing with ratio and brand
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post #2 of 11 (permalink) Old 04-26-2014, 08:37 PM
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Re: iso front and rear gears for a 7.3 to handle 38s

Yukon gears are good but expensive and you would be most likely looking at 4.10 gears for those tires
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post #3 of 11 (permalink) Old 04-27-2014, 02:28 AM
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Re: iso front and rear gears for a 7.3 to handle 38s

I have had 4.56 Yukon gears in my 7.3 with 38's for about 6 yrs and have had zero issues.
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post #4 of 11 (permalink) Old 04-27-2014, 09:44 PM
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Re: iso front and rear gears for a 7.3 to handle 38s

what rpm do you like to run at your freeway cruising speed? gear it to that.
the Yukon master install kits are really nice for doing gears

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post #5 of 11 (permalink) Old 04-27-2014, 11:59 PM Thread Starter
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Re: iso front and rear gears for a 7.3 to handle 38s

Cool I'll deff check them out
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post #6 of 11 (permalink) Old 05-05-2014, 01:58 PM
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Re: iso front and rear gears for a 7.3 to handle 38s

4.30s will put you right where the stock powerband and power would be when running 37s or 38s. 4.56s will up the rpm a bit on the highway but give you a little more at take off. I run 37s with my 3.73s and love the highway running at 17mpg and when towing I just lock out the od and at 65mph it tachs at 2100rpm and purrs right along. When using od at 65 I tach at 1700 and if not in the hills ill get 17mpg in hills I lock out od and let it sing.
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post #7 of 11 (permalink) Old 07-15-2014, 10:57 PM
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Re: iso front and rear gears for a 7.3 to handle 38s

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Originally Posted by Bobs 7.3 View Post
4.30s will put you right where the stock powerband and power would be when running 37s or 38s. 4.56s will up the rpm a bit on the highway but give you a little more at take off. I run 37s with my 3.73s and love the highway running at 17mpg and when towing I just lock out the od and at 65mph it tachs at 2100rpm and purrs right along. When using od at 65 I tach at 1700 and if not in the hills ill get 17mpg in hills I lock out od and let it sing.
same here 3.73 with a zf6 and 37s i get about 17 if i go long distance but for the most part 15.5 sometime 16 just driving to work and back. when i tow i get about 15 . but im only towing a jeep. honestly if i were to put gears id go with 4.10s these trucks have to power to pull 38s

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post #8 of 11 (permalink) Old 08-10-2014, 02:23 AM Thread Starter
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Re: iso front and rear gears for a 7.3 to handle 38s

I have 3.73 gears in her now what can I do to prevent the tires from chewing up the trans I have the ts 6 pos on it and I'm starting to think it's the culprit of the problem
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post #9 of 11 (permalink) Old 08-17-2014, 01:39 PM
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Re: iso front and rear gears for a 7.3 to handle 38s

I would get the Yukon gears 456. I have had those for a few years with a stock trans and cooler with abts chip as well. I would suggest getting a bigger trans cooler because mine gets hot but that's really getting on it in the sand dunes but going down the express way at 70-75 it runs about 1800 rpm if I remember right. But I love the gears I have. Way more power and I have 37s on it
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post #10 of 11 (permalink) Old 08-18-2014, 11:22 PM
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Re: iso front and rear gears for a 7.3 to handle 38s

With the majority of the others. 1st truck was on 37's witha tuner and JWVB and with 3.73's it had no problem whatsoever with 37's and got high 17's on the highway at 70-75. Current is 3.73 with 35's and i actually miss the first setup as i average 14.5-15 now. From a stop first one was quick , i didn't tow however and dont quite get the big lift , heavy tow idea either. Stock TS tunes ? maybe the shifting needs refinement via custom tuning.

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