Need the guys with 4.10s and 4.30s to speak up !! - Ford Powerstroke Diesel Forum
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post #1 of 13 Old 12-30-2013, 07:26 PM Thread Starter
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Need the guys with 4.10s and 4.30s to speak up !!

So im considering a gear swap to aid in my towing capabilities I currently have the fuel economy minded 3.31s ( I think ) so when im towing over 10k I usually lock 6th out and keep her at 18-19 in 5th which keeps me rite around 60. I don't to much like cruising at or above 2k and 18-19 in 6th is damn near 80. But my truck hits the split part of 4th at 40mph and it shifts into 2nd at alil under 10mph. What are your guys shift patterns and freeway RPMS with taller gears ??

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post #2 of 13 Old 12-31-2013, 08:29 AM
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Cool F450 with 430 gears...

I tach about 22-2300 at 70mph. 65mph is 2k, and 60mph is 18-1900rpm. (My previous DRW 2013 had 373 gears, and I wouldn't go any higher than that) The F450 only comes with 430s and I will re-gear once the truck has 10-15k miles on it. JMO, Scott
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post #3 of 13 Old 12-31-2013, 11:40 AM Thread Starter
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Wowwwa that's alil steep for me 2300 RPM maybe I'll be keeping the 331s and just keep her in 5th haha just the answer I was needing to keep 2k in my pocket

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post #4 of 13 Old 01-19-2014, 03:49 PM
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Bump...I'm shopping gears myself and would like to here more from those with similar ratios...I'm seeing nitro 4:11's


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post #5 of 13 Old 01-19-2014, 07:18 PM
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Yeah I'm thinking about getting 4.10 gears for my 37s in the future on the idea that it will give me less the lag off the line. I'm not looking forward to paying for them though.
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post #6 of 13 Old 01-23-2014, 10:10 PM
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3.55's in my truck...if I baby it I can get it to shift into 6th around 40 mph. Cruising at 60 mph is just under 1500 rpm if I recall correctly. That's with stock 275/65-18 tires and wheels. I could see someone running 35's or bigger wanting to get away from the 3.31's.
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post #7 of 13 Old 01-24-2014, 04:30 AM
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Carli,

Your 35 inch tires would result in substantially lower rpm's than a stock 450. I believe that our 245/75R17E's are 31.6 inches in diameter.

Http://nationaldrivetrain.com/Tech_pages/app_chart.html
Has info on engine rpm versus various gears and tires.
The chat i refer to is for final transmission drive of 1:1, so it will need adjustment or maybe they now have a chart for overdrive transmissions.

You can trick the chart by using Scott's 1,850 rpms at 60 (say the 1,854 in the chart) for 32 inch tires. This is a non overdrive equivalent of 3.21 gears. Put 35 inch tires on Scott's or my stock truck and rpm's at 60 will drop to 1,695.

Are you using your aftermarket gps to calculate your reported speed, or did you have ford reset computer for your tire size? If not recalibrated, the speedometer will report a much lower speed than you are actually going.

If i recall, the final drive ratio choices on the 250/350 are offset by the mandatory swap in tire sizes for the respective ratio. You of course added the 35's to the wrong ratio for what you want to do.


Depending upon how heavy, how often and where you tow determines the ratio you need. What works on flatland with a 12k load won't work very well in the mountains, or for a tall wide front 5er on flatland. The cost of changing gears versus new tires and rims is probably a tossup, but either one will get you into the rpm range you need. Just make sure the smaller tires can support your actual load if you think about going that way.

I would think that locking the tranny on long runs is not good for its longevity.



Quote:
Originally Posted by Carli'd6.7 View Post
Wowwwa that's alil steep for me 2300 RPM maybe I'll be keeping the 331s and just keep her in 5th haha just the answer I was needing to keep 2k in my pocket

John D
2011 F450
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post #8 of 13 Old 01-24-2014, 08:43 AM
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post #9 of 13 Old 01-24-2014, 08:54 AM
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Quote:
Originally Posted by OCVeloMan View Post
I wouldn't go over a 3.55 with 35" tires....
What about for 37" tires?
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post #10 of 13 Old 01-24-2014, 09:29 AM
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Quote:
Originally Posted by Dantron View Post
What about for 37" tires?
With the new trans gearing in the 2011+ trucks I would say that 3.73's would be good with 37's. 4.10's would probably have you up a bit far in the RPM's if you do a lot of driving over 70.



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