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Old 07-28-2014, 01:23 PM
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Gear ratio for a 7.3

I have an early 99 4x4 extended cab powerstroke and I am in the process of building a 4x4 crew cab out of it. My donor truck has a limited slip 4.10 gear ratio rear end, my truck now has an open 3.73 rear end. The truck has a 4 inch lift with 35 inch tires and a 6 speed trans. Would the 4.10 be too low of a gear ratio? I would really like the limited slip, but if I do that I still have to find a front axle of the same ratio. Not sure if I should even jack with it, just wanted some opinions. Thanks
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Old 07-28-2014, 02:33 PM
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I would do the 4.10. It would be just about right.
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Old 07-28-2014, 02:46 PM
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with 35's the "correct" gear is 4:88's so 4:10's are a step in the right direction.
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Old 07-28-2014, 05:44 PM
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I'm just worried about turning too many rpm's at 75 or 80. Since that's what it seems all the highways are goin too.
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Old 07-28-2014, 11:26 PM
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4.10 is perfect for 35" tires. It's about the closest final drive you can get to 3.73 with stock tires. My 95 with 4.10's, 35" tires and a ZF6 is around 68mph at 2000RPM.
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Old 07-29-2014, 03:04 AM
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Ok, thanks for the help. I think I will give it a try when I get this build done and see how she does.
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Old 07-29-2014, 04:15 AM
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Quote:
Originally Posted by dannanw View Post
with 35's the "correct" gear is 4:88's so 4:10's are a step in the right direction.
Whoa... who's math is that?

I have stock 3.73s with 35s and a 4r110... 77-78 MPH on GPS is 2000 RPM. Its nice unloaded. I'd want 4.10s if I towed heavy often.
nuthinbutfords likes this.
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Old 07-29-2014, 05:01 AM
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If it was still my daily driver I probably wouldn't mess with it, but like you said, when towing I think it will do a lot better.
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Old 07-29-2014, 05:11 AM
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Being a standard I would do the 4.10 like I said above. I have a standard and 35" and I really have to lug the motor a lot on take off and it's kinda smokey. Having gears to high will cause it to be very laggy on take off.
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Old 07-29-2014, 09:43 AM
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I run 35's with my stock 3.73's. Tow 8K lbs often and love the combo.

2000 RPM's and im at 70 MPH. I pull most grades in 6th gear, only reason i ever downshift is cause of EGT's getting too hot.
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