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GEN 1 (2010-2014) Ford SVT Raptor Forums
Ford Raptor Engine Discussion and Performance Mods
Need Help : 456 gear ratio for 37" tires
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<blockquote data-quote="DreamcastERA" data-source="post: 1547723" data-attributes="member: 34087"><p>Nitro Gear makes full kits that come with everything - it's essentially a full rebuild of the differential. Bearings, seals, the gears themselves - everything. I personally went with 4.88. People haven't generally had the best experience getting Ford to reprogram stuff like this. I would recommend the 5 Star tune route. It will reprogram all of your dials - account for both gear ratio and tire size. Some people have reported that the transmission shifts were a little bit odd after changing gear ratio - before reprogramming. However - in your case, it might not be that bad - due to the fact that you're going back to a similar relationship to stock between tire and gear ratio. Yukon gear is also a good option. </p><p></p><p>Speaking of - you're engine RPM at 65 MPH in 6th gear will look like this under each scenario:</p><p></p><p>Stock (4.10 w/ 34.5"): 1791 RPM in 6th gear</p><p>Current (4.10 w/ 37): 1670 RPM in 6th gear</p><p>4.56 w/ 37": 1857 RPM in 6th gear</p><p>4.88 w/ 37": 1988 RPM in 6th gear</p><p></p><p>Hope some of that info was helpful!</p><p></p><p>Best of luck!</p></blockquote><p></p>
[QUOTE="DreamcastERA, post: 1547723, member: 34087"] Nitro Gear makes full kits that come with everything - it's essentially a full rebuild of the differential. Bearings, seals, the gears themselves - everything. I personally went with 4.88. People haven't generally had the best experience getting Ford to reprogram stuff like this. I would recommend the 5 Star tune route. It will reprogram all of your dials - account for both gear ratio and tire size. Some people have reported that the transmission shifts were a little bit odd after changing gear ratio - before reprogramming. However - in your case, it might not be that bad - due to the fact that you're going back to a similar relationship to stock between tire and gear ratio. Yukon gear is also a good option. Speaking of - you're engine RPM at 65 MPH in 6th gear will look like this under each scenario: Stock (4.10 w/ 34.5"): 1791 RPM in 6th gear Current (4.10 w/ 37): 1670 RPM in 6th gear 4.56 w/ 37": 1857 RPM in 6th gear 4.88 w/ 37": 1988 RPM in 6th gear Hope some of that info was helpful! Best of luck! [/QUOTE]
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GEN 1 (2010-2014) Ford SVT Raptor Forums
Ford Raptor Engine Discussion and Performance Mods
Need Help : 456 gear ratio for 37" tires
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