Help with gears... - Ford Powerstroke Diesel Forum
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post #1 of 11 Old 06-16-2013, 03:53 PM Thread Starter
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Help with gears...

Hello, maybe this is posted in the wrong place an sorry but thought this is where I'd get the best help.

04/f-350 DRW 4x4
I'm running 235/75/22.5"(35") now an it was time to buy new tires so I wanna go with 275/75/22.5" (37")... So I went out an bought an ICON 6" lift with there shocks.. Now the bug has really bitten me to go BIGGER on the tires. That puts me at 295/75/22.5"(40"). I've searched everywhere a out what will fit an what won't. I e also read where people have given the worse advise. I ran those 35" tires for years an had no problems with rubbing an then read "they will NEVER fit".. So I'm not sure what will an what won't work. I'm gonna give the 40's a shot an if I gotta do some trimming it'll go to a body shop an have it done as clean as possible. I would have went with a bigger lift but I don't like the look with all that space over the top of the tire. So maybe ill just have to trim the sides of the wheel wells.

Sorry to go on but thought it would help to understand what's going on..

So.. My truck has 4.10's now an I run a 35" tire. I'm going up to 40" tires.. What gears to I put in? My truck has a powermax, 175's, SCT, Studs pretty much the norm. I've run a 13.05 with the 35's an I understand I just changed the truck so it's going to be slower but what gears to I put in.

I'm not sure what gears to run an where to buy them or the type. I drive 90% on the road an mostly 5-25mi runs.. I do tow my airstream (it's kinda light) but for the most part it's a cream puff. The other 10% is run balls out racing anything I can... I run Matt's SRL+ everyday.

Hope to get help on this, need to buy the gears this week. Thanks

04/350 with some stuff done to it
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post #2 of 11 Old 06-16-2013, 03:55 PM Thread Starter
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Sorry.... I'm working on the road so I'm using my phone to post. Sorry for spelling

04/350 with some stuff done to it
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post #3 of 11 Old 06-16-2013, 04:05 PM Thread Starter
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Maybe I should have mentioned I have gone to a bunch of web sites with gear calculators. Most times what gears I'm told to use arn't offered. I just need help on what to buy. I also gotta get (install kits??). My buddy is putting them in for me an he said I buy the parts he'll put them in for me. Great mechanic an owes me for doing his roof.

Please make this painless for me.

04/350 with some stuff done to it
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post #4 of 11 Old 06-16-2013, 04:25 PM
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I'd go with 4.56's for 40's.

2005 F-250
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post #5 of 11 Old 06-16-2013, 04:33 PM
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I agree with Snake. If you don't mind a little higher rmps you could go with 4.88's.

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post #6 of 11 Old 06-16-2013, 04:33 PM
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With a 40" tire, I would say a 5.13 or even a 5.30 (or something close to that) a 40 is a big tire and those gears SHOULD keep you close to a stock 3.73 rpm range.

I have never went that big with tires or gears so this is all just my speculation from looking at a few different calculators/graphs online and remembering a few things from back in the days I played with Jeeps...

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post #7 of 11 Old 06-16-2013, 05:09 PM
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Considering that you've gotten use to how the truck feels with 35's and 4.10's, I'm going to recommend 4.88 gears. Like stated above a 40" tire is a big tire. I run 5.13's in my jeep with 39's and it feels pretty close to how a stock jeep did. I know a PSD has a ton more torque than a 4.0 jeep motor so that's why I'm saying 4.88 gears would be perfect. And I would buy the gears and master install kits from Randy's Ring and Pinion. I've always had good service from them.



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post #8 of 11 Old 06-16-2013, 05:35 PM Thread Starter
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That's why I posted this question. I was going to go with 5.38 or bigger.. an then I tried to figure out where to buy them an couldn't find the size. Do the fronts rotate backwards?

I'll never go bigger then 40" so this is the max size.. Maybe 5.13's ?? I do drive it everyday for work so with fuel not going down any time soon I really wanna try an make this the best bang for the buck.

Is there anything with my axles I need to know to order the right gears?? I blew the pass side shaft in the front an I bought the wrong one. Thought I'd ask ahead of time.

Thanks for all the input. The tire really is alot bigger. Not just 5". It's just way bigger all the way around.
Thanks

04/350 with some stuff done to it
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post #9 of 11 Old 06-17-2013, 03:04 AM
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Why ask people's opinions, stick to facts. Here's the chart, it goes up to 39s, you can probably find one that goes bigger on google. Looks like 4.88s with 40s would get you closest match to your previous 4.10s and 35s, 5.13s would get you as close to stock as able. The front gearset is reverse rotation because the pinion is on top of the axle. Call Randy's ring and pinion when your ready.

http://www.quadratec.com/jeep_knowle...article-26.htm

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post #10 of 11 Old 06-17-2013, 04:11 AM
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My truck came from Ford with 3.73's and tires that were 34" in diameter. I'm now running 37's and 4.30's and the truck turns more rpms than stock. No way I'd go to 5.13's or 4.88's with a 40" tire. Especially if I had a Powermax and 175cc injectors. Yeah, the truck came with 4.10's and not 3.73's, but let's be honest here.......those 4.10's were there for towing and a dually on 40's won't be pulling big weight. Just my $0.02.

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Last edited by Snake; 06-17-2013 at 04:15 AM.
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