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Old 02-17-2013, 11:25 PM   #1 (permalink)
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3.73 vs 4.10 rear end

I tow a 20 ft gooseneck with my 97PS which has 4.10 rear end gears. I am looking at buying a 2002 f350 PS and some of them that I have looked at have 3.73 rear end gears. I pull about 15-17K loaded with my 97PS and have no problem. What is the difference in pulling the same weights with the 2002PS with 3.73 gears? Am I going to have to change to the 4.10??? Any imput would be appreciated
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1997 F250 PS 4 wheel drive John Wood towmaster tranny with Tru-cool tranny cooler and second Summitt tranny cooler with pusher fan on at 175 degrees, tranny temp gauge 4:10 gears aluminum diff cover with royal purple supercab flat bed, stancor glo plug relay, factory aluminum rims Firestone ride rite airbags rear 430,600 miles. 2002 F350 PS 4 wheel drive, 133,000 miles. Stock. Will be adding to make it my road tow vehicle to Vegas. Just added 31 row 6.0 cooler with Isspro tranny temp gauge and steering column mount.
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Old 02-17-2013, 11:34 PM   #2 (permalink)
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What speeds are you going to be going? What is your percentage time towing versus unloaded. I pull 10-12K with no issues (with my DP-Tuner), but I would imagine at 17K it would start to be a challenge. I wouldn't want to be going 70mph with 4.11 gears considering the mileage drop above 2000 RPM. If you are predominantly towing at 60-65 mph and below, I thing the 4.11s will serve you best. If you only tow periodically, then the 3.73 will do. Either way, you MUST get a transmission temperature gauge and a 6.0 transmission cooler or another JW transmission will be in your future shortly. The DP-Tunes make towing so much more enjoyable.
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Old 02-18-2013, 12:42 AM   #3 (permalink)
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3.73 vs 4.10 rear end

Thanks for the input..I already have planned on another trip to Holtville. My tranny in my 97PS was still good when I visited John Wood. It was the best move I made in my hauling firewood to Vegas business. I change my tyranny fluid regularly and I have peace of mind when I am pulling the hills to Vegas.. Thanks again for the info


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1997 F250 PS 4 wheel drive John Wood towmaster tranny with Tru-cool tranny cooler and second Summitt tranny cooler with pusher fan on at 175 degrees, tranny temp gauge 4:10 gears aluminum diff cover with royal purple supercab flat bed, stancor glo plug relay, factory aluminum rims Firestone ride rite airbags rear 430,600 miles. 2002 F350 PS 4 wheel drive, 133,000 miles. Stock. Will be adding to make it my road tow vehicle to Vegas. Just added 31 row 6.0 cooler with Isspro tranny temp gauge and steering column mount.
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Old 02-18-2013, 05:16 PM   #4 (permalink)
 
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Dually I hope....
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Old 02-19-2013, 03:15 AM   #5 (permalink)
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Rear ends

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Originally Posted by caryt View Post
Dually I hope....
I considered a dually but my f250 with the firestone ride right air bads towed my loads to Vegas for over 400K miles in the last 10 years that I am upgrading to an f350 but not a dually. I have blown tires on every possible wheel over that 10 year period and have gone down the road straight as a string in every instance. The only problem I really experienced was stopping. Came close a couple of times with everything locked up to rearending some idiot in Vegas who passed me and then had to brake to stop for a red light, but I paid very close attention to what was going on around me and with a lot of luck included never had a wreck. I just don't like the duallys in the hills and I take my trucks in the hills. You are right that it would probably be safer....That I will not deny. Thanks
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1997 F250 PS 4 wheel drive John Wood towmaster tranny with Tru-cool tranny cooler and second Summitt tranny cooler with pusher fan on at 175 degrees, tranny temp gauge 4:10 gears aluminum diff cover with royal purple supercab flat bed, stancor glo plug relay, factory aluminum rims Firestone ride rite airbags rear 430,600 miles. 2002 F350 PS 4 wheel drive, 133,000 miles. Stock. Will be adding to make it my road tow vehicle to Vegas. Just added 31 row 6.0 cooler with Isspro tranny temp gauge and steering column mount.
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Old 02-22-2013, 08:48 PM   #6 (permalink)
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Correct gear ratios have to do with being in the "sweet-spot" of the power-band, or the lowest RPM at the max torque.
Anyhow, proper axle ratio is calculated by: tire height (inches) x .12= Correct gear ratio. This calulation puts you in the center of the sweet-spot for best all-around use.
If you want better economy drop 1 gear size. If you want better towing go up one gear size. Any further jump then 1 size up and the engine will over-rev & waist fuel. More then 1 gear smaller will start to lug the engine below the power-band.
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Old 02-22-2013, 10:13 PM   #7 (permalink)
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Quote:
Originally Posted by dennis11 View Post
I am looking at buying a 2002 f350 PS and some of them that I have looked at have 3.73 rear end gears.
All the 2002 F-350 SRWs have a stock 3.73 ratio. On the DRW, 3.73 open axle was standard and 4.10 limited slip was optional.

Quote:
I pull about 15-17K loaded with my 97PS and have no problem. What is the difference in pulling the same weights with the 2002PS with 3.73 gears?
Probably about the same. The '99-up has more power and torque with the charge air cooler (so-called intercooler).

Your GCWR is 20,000 pounds, so you'll be a few thousand pounds overloaded over the GCWR. And if your 2002 is a CrewCab 4x4,you'll also be overloaded over the GVWR. So if you must tow at night, then install air bags and use them so your headlights don't blind oncoming drivers. And if your truck is an automatic, don't leave home without installing a tranny cooler from a 6.0L PSD, and a tranny temp gauge with the sender in the pressure port on the driver's side of the tranny. NEVER allow the tranny temp to go over 225, or you'll soon be visiting John Wood.

If you don't like the lack of performance when towing, then first install a pre-turbo pyrometer, then a 60-tow or 40-tow tune from DP-Tuner or Power Hungry Performance. Even dragging just 8,000 pounds, I would not want to tow without my 60-tow tune. With you heavier load, you might prefer 40-tow. And if you never allow more than 1,250 EGT, the towing tune won't reduce the longevity of your 7.3L engine.
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My Sierra Blanca in the sig pic was a great pickup for 11.5 years. I sold it a coupla years ago. I drove a hand-me-down 2003 F-150 SuperCrew 4.6L 2V for a while, but it was unacceptable for towing more than a rowboat. Replacement is a 2012 F-150 EcoBoost SuperCrew Lariat that tows my 5,000-pound TT like a dream.

Last edited by SmokeyWren; 02-22-2013 at 10:21 PM.
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