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Old September 22nd, 2012, 09:55 AM   #1
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Default Re gearing my duty.

I've been looking in to re gearing my truck to take the stress off my trans when I'm towing. I'm in between 3rd and 4th at 70ish. And it shifts a lot.

From the research I've done the original tire size is 265/75/16 and from information I've read on the webz is that that tire would measure 31.5"

I now have a 40" tire. (true 40")

When I punch the numbers in to online calculator I come up with a 4.40 gear. So my options would be 4.30 or 4.56.

I would go with the 4.56 but I'm thinking for some reason that's not enough? It just seems like that would not be tall enough to me.
Any one have any insight?

It's a 2000 7.3 my rpms at 75 with nothing in tow is 1800 rpm. I need to be around 2000rpm towing to stay in OD.
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Old September 22nd, 2012, 10:18 AM   #2
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2 sets of wheels and tires.
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Old September 22nd, 2012, 10:34 AM   #3
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It would look silly as hell with 265's on a 10" lift with full cut outs.
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Old September 22nd, 2012, 10:37 AM   #4
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Old September 22nd, 2012, 10:59 AM   #5
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Old September 22nd, 2012, 11:15 AM   #6
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IMO id go with 4.56s as it would be a huge increase over your current setup. If your worried about it not being enough go with 4.88s. When driving empty you dont want it revving to the moon and sucking diesel

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Old September 22nd, 2012, 11:26 AM   #7
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Look at the gear/tire size chart and see what rpm you will be cruising at 70mph. Go drive your truck and see if you are comfortable at the rpm with any certain gearing you are considering. For myself I have to go by feel and not a number I see on a chart. Every vehicle is different.
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Old September 22nd, 2012, 12:22 PM   #8
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Look at the gear/tire size chart and see what rpm you will be cruising at 70mph. Go drive your truck and see if you are comfortable at the rpm with any certain gearing you are considering. For myself I have to go by feel and not a number I see on a chart. Every vehicle is different.
I will look for one tonight. That would help a lot. At 1500$ a set I don't want to get it wrong the first time.
And I would rather have a little too much than not enough. I only drive this on the weekends and towing. Not a dd
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Old September 22nd, 2012, 02:52 PM   #9
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Just did a bunch of recon on diesel forums and came to the 4.56 as being the best option for me. They say 4.30 is a good driving gear an 4.56 is a good towing gear for the 7.3 w40s I'd rather have to much than too little for how I use it.
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Old September 23rd, 2012, 08:03 PM   #10
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I would rather have a little too much than not enough. I only drive this on the weekends and towing. Not a dd
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Old September 26th, 2012, 07:21 PM   #11
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whats a duty?
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Old September 26th, 2012, 07:25 PM   #12
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whats a duty?
What you leave in a toilet after eating taco Bell.
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Old September 26th, 2012, 07:29 PM   #13
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Super poopy
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Old September 27th, 2012, 06:44 AM   #14
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What you leave in a toilet after eating taco Bell.
That's what I thought, why would you regear one of those?
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Old September 27th, 2012, 07:30 AM   #15
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That's what I thought, why would you regear one of those?
Because they usually launch pretty hard out of the chute, so being able to slow them down and utilize a little torque could come in handy in ceratin situations.
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