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post #1 of 10 Old 04-12-2011, 01:33 PM Thread Starter
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gear ratio?

What gear ratio should I be running On my truck. I have 35s and was wondering if I should change it . Thanks

2004 f350 6.0, 6spd, studs, 175/stock warrens, deleted, blue spring, 6.4 banjos, strait 4 in exhaust, zoo dad mod, 35s, 3.5 in lift,


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post #2 of 10 Old 04-12-2011, 01:38 PM
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I would think the stock gearing would be ok. Stock tire height is 31.5" if you had 265/75/16. If you have 3.73 gears and regear for 35's it comes out to a 4.14:1 gear. http://www.ramblerman.com/blazer/gearcalc.htm


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post #3 of 10 Old 04-12-2011, 05:01 PM
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4.10s will get you back to stock. 4.30s will be the next step up if you go to bigger tires.


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post #4 of 10 Old 04-12-2011, 05:17 PM
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Depends on what your looking for. Upgrading your gears will give you more low end torque and response, but fuel economy will suffer on the freeway. Changing from 3.73s to 4.10s isn't going to make a huge difference, and may not be worth the money.

My last truck ('05 Dodge) had 3.92s. I swapped em out myself with Motive 4.56s. Noticeable difference. Fuel economy started to suffer once I got above 55 mph.

Don't fear the gears!

06 F250 FX4 Lariat, 35" Nitto Terra Grapplers, 6" Lift Leveled w/Bilsteins, 4" MBRP TB Exhaust w/Cat Delete, Edge Insight w/EGT Probe & Dash Pod, SCT X3 w/SRL Tune From Matt @ Gearhead, Powerslot Rotors, Hawk Pads, Upgraded Oil Cooler Screen, Upgraded Turbo Drain Tube, Upgraded STC Fitting, Upgraded FPR Spring, CAT ELC Coolant, ARP Head Studs, Opti-Lube XPD, Coolant Filter, 45K Miles
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post #5 of 10 Old 04-12-2011, 05:24 PM
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You won't see a return on investment swapping over to the 4.10's. There are plenty of trucks on the road with 3.73's and 35" tires. How often are you off-road? How important is it to you to keep fuel economy? That's really whats going to make the difference here, 4.10's put you closer to stock, anything lower will make you more capable in the dirt.
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post #6 of 10 Old 04-12-2011, 06:56 PM Thread Starter
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Thanks fot the input guys . I don't off road any really except to hunt and the occasional farm stuff. I hiss its not worth the money to switch then. I do feel a tiny difference coming off the clutch in first. Just wanted it to be right. I never had any problematic till I put the lift and tires on now I can't tell if my clutch is acting up or I got a u joint going bad.

2004 f350 6.0, 6spd, studs, 175/stock warrens, deleted, blue spring, 6.4 banjos, strait 4 in exhaust, zoo dad mod, 35s, 3.5 in lift,


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post #7 of 10 Old 04-13-2011, 06:46 AM
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Did you correct the pinion angle for your lift?
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post #8 of 10 Old 04-13-2011, 01:02 PM Thread Starter
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No I didnt. Wasn't sure I had to for just a 3.5 lift. When I come off clutch and gas it in each gear it gives a little bump like a springs Broke in clutch. Stress stress lol

2004 f350 6.0, 6spd, studs, 175/stock warrens, deleted, blue spring, 6.4 banjos, strait 4 in exhaust, zoo dad mod, 35s, 3.5 in lift,


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post #9 of 10 Old 04-13-2011, 01:12 PM
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Quote:
Originally Posted by PGreenSVT View Post
Did you correct the pinion angle for your lift?
You mean shim the carrier? My rear blocks have an angled slope in them.

I get a vibration right at about 8-10 mph, then goes away. I wonder if this could be it? I got under the truck the other day, and tried turning the driveline by hand and it only wiggled a tad. The vibration is worse under hard acceleration, and barely noticeable under light acceleration. Maybe axle wrap?

06 F250 FX4 Lariat, 35" Nitto Terra Grapplers, 6" Lift Leveled w/Bilsteins, 4" MBRP TB Exhaust w/Cat Delete, Edge Insight w/EGT Probe & Dash Pod, SCT X3 w/SRL Tune From Matt @ Gearhead, Powerslot Rotors, Hawk Pads, Upgraded Oil Cooler Screen, Upgraded Turbo Drain Tube, Upgraded STC Fitting, Upgraded FPR Spring, CAT ELC Coolant, ARP Head Studs, Opti-Lube XPD, Coolant Filter, 45K Miles
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post #10 of 10 Old 04-13-2011, 01:29 PM Thread Starter
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See I thought the same thing but I don't have any lift in rear because it took 3 inches just to bring it up to level . I think someone added helper springs before me . My clutch doesn't slip which makes me think its ok but you never know . I thought about trac bars too

2004 f350 6.0, 6spd, studs, 175/stock warrens, deleted, blue spring, 6.4 banjos, strait 4 in exhaust, zoo dad mod, 35s, 3.5 in lift,


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