Tire and gear ratios? - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 30 (permalink) Old 08-31-2009, 03:01 PM Thread Starter
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Tire and gear ratios?

I know there was a tire versus gear ratio table somewhere around, but I cannot find it.

Would somebody please post up the link?

I am trying to decide if I should use 430s or 411s w 37s.
I am leaning towards the 411s.

Thanks,
Sean

99 F350 CCLB
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post #2 of 30 (permalink) Old 08-31-2009, 04:02 PM
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Re: Tire and gear ratios?

Use the PSN Calculator, go down the page and put in the data.

https://powerstrokenation.com/calculators/


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post #3 of 30 (permalink) Old 08-31-2009, 04:08 PM
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Re: Tire and gear ratios?

4.30's.

That's what I run, and my tires measure 36 inches.

Curtis
2002 F-250 PSD
Gambling with 250/200's on PMR's.
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post #4 of 30 (permalink) Old 08-31-2009, 06:03 PM Thread Starter
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Re: Tire and gear ratios?

Quote:
Originally Posted by Pocket View Post
4.30's.

That's what I run, and my tires measure 36 inches.

What RPM do you run at 70?

W 38.5s and 456s I tach [email protected] in 3rd. When I had the 430s I would tach [email protected] in 3rd. I liked the 430s better than the 456s for DD, and towing also worked well because I could keep it in drive more.

Now that I'm thinking of dropping to a 37" tire I am trying to decide weather the 430s would be too low (more like the 38.5s w the 456s).

What is the stock RPM @ 70? Is this going off a 31" tall tire?

Thanks,

Sean

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post #5 of 30 (permalink) Old 08-31-2009, 06:38 PM
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Re: Tire and gear ratios?

With 36's and 4.30's, I'm just a hair over 2000 RPM's at 70mph in O/D. IIRC I hit 2000 RPM's right at 68 mph. In stock form, most trucks hit 2000 RPM's at 70 mph, so it's pretty damn close to stock. Also my speedo has been corrected, and is dead on with the GPS in my truck.

I do race, tow, offroad, do highway driving, etc, and the gearing has been just fine for me.

Hope this helps!

Curtis
2002 F-250 PSD
Gambling with 250/200's on PMR's.
478hp/851tq on Haller's dyno - 7/28/12
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post #6 of 30 (permalink) Old 08-31-2009, 06:58 PM
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Re: Tire and gear ratios?

4.10's.........err, 4.11's (???)

Whichever it is, go with that ratio. If you need more gear than that to get around on freakin 37's, you need to park your prius.

4.30's with anything less than a 40" tire must be a joke. What a slow pile of sh*t that would be.
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post #7 of 30 (permalink) Old 08-31-2009, 07:10 PM
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Re: Tire and gear ratios?

Quote:
Originally Posted by Charles View Post
4.10's.........err, 4.11's (???)

Whichever it is, go with that ratio. If you need more gear than that to get around on freakin 37's, you need to park your prius.

4.30's with anything less than a 40" tire must be a joke. What a slow pile of sh*t that would be.


Charles, you need to tow something... or drive up a real mountain pass...


Plus, in a truck that stands 7'10" at the top of the cab, I'm not interested in trying to hit 150 mph on the highway.

Curtis
2002 F-250 PSD
Gambling with 250/200's on PMR's.
478hp/851tq on Haller's dyno - 7/28/12
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post #8 of 30 (permalink) Old 08-31-2009, 08:39 PM
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Re: Tire and gear ratios?

Quote:
Originally Posted by Pocket View Post


Charles, you need to tow something... or drive up a real mountain pass...


Plus, in a truck that stands 7'10" at the top of the cab, I'm not interested in trying to hit 150 mph on the highway.

You might need to make some power....

Cause I can do just about everything you listed, and aside from the 150mph.... I have plenty.

The "hills" near my house are 8%+

I tow MontEagle plenty, it's 6% for something like 6 miles. I always just rock the cruise control at 65mph (55mph speed limit) at my usual 20,000 or so lbs gross.

Other than that, I still tow our skid-steers around, although not as much as I used to now that we have the 550. I did put a gooseneck hitch in the truck a few months back though. Didn't do it because I don't tow.

lol.


If you need a 4.30+ gear for a 37" tire, you need more powah. Plain and simple.
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post #9 of 30 (permalink) Old 08-31-2009, 08:46 PM
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Re: Tire and gear ratios?

i'm running 35's w/ 4.30's and love it. not very long legged, but it gets there in a hurry

09 6.7 cummins w/ a couple things
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post #10 of 30 (permalink) Old 08-31-2009, 09:06 PM
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Re: Tire and gear ratios?

Quote:
Originally Posted by Charles View Post
You might need to make some power....

Cause I can do just about everything you listed, and aside from the 150mph.... I have plenty.

The "hills" near my house are 8%+

I tow MontEagle plenty, it's 6% for something like 6 miles. I always just rock the cruise control at 65mph (55mph speed limit) at my usual 20,000 or so lbs gross.

Other than that, I still tow our skid-steers around, although not as much as I used to now that we have the 550. I did put a gooseneck hitch in the truck a few months back though. Didn't do it because I don't tow.

lol.


If you need a 4.30+ gear for a 37" tire, you need more powah. Plain and simple.
More power at 1500 RPM's.

Hmm, other than running twins or water, how do you suggest the other 99% of PSD owners with lifts and big tires keep EGT's in check??? Other than constantly downshifting or gear hunting? Heck, on another forum there's a guy wondering why his EGT's are spiking while towing a 5000 lb trailer. He's running 37's and never changed his stock gearing. Now he has to downshift to 2nd just to go up a long hill with a 5000 lb load in tow.

I guess running at a proper RPM range is a big no-no now. After all, you preached for so long about how making big torque numbers too low in the RPM range is equating to having sex with your own sheep. But I guess lugging the engine is ok now, right.

Oh, and I lived in SC for several years, and drove my truck all over SC, NC, GA, TN, etc. Those aren't mountains. One more thing... while living out there, I also ran my truck with 36" tires and stock 3.73 gears. I'll give you a hint... it worked, but it was far from optimal for towing or even daily driving.


There you go Charles, that should give you plenty to play with. By the tone of your post, you looked bored. Maybe now you'll have something to keep you entertained for the afternoon.


Curtis
2002 F-250 PSD
Gambling with 250/200's on PMR's.
478hp/851tq on Haller's dyno - 7/28/12
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