Neal, I was considering the 4.10 gear swap.
How much did it cost and where did you get the gears?
We both HAD bascially the same truck (when they used to be stock)
By the seat of the pants feel, do you think it is a better mod than Airaid or Superchip dollar for dollar?
I'm thinking of some 285/75/16s later and don't want to giveup too much power

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Truck Pictures

99 XLT 5.4L Regular Cab 4x2 120" Wheelbase 4 wheel disc brakes/ABS 5 star larait style wheels Toreador Red/Silver 3.55 gears 275/70/16 Micheln LTX Delta toolbox, Ford Running Boards, Ventshades, Bugflector, Bullrings, Donnelly compass mirror, 2" Rear drop.
Eclipse 5340 cd player
Memphis ARCS50 component speakers w/tweeters mounted flush in the door panels (excellent sound)powered by a Sherwood 35x2 RMS amp
Kicker ZR360 for the 2 Audiobahn AWC10 subs
54regcab@ifreedom.com

 

Neal, please post pics of your truck. read your sig. and I am dying to see it. Thanks, Sean

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2000 F150 XL Wedgewood Blue. Eclipse flip down CD player, Eclipse point source door speakers. Rockford Fosgate 8' truck box speakers. Fosgate 160x4 punch AMP. Power and appearance mods to come.

 

Neal -
If you're not getting tired of this? I had a '97 w/P235/70Rx16SL tires and 3.08. I am getting a 2000 w/P255/70R16SL and 3.55. How much effect will this have on gas mileage do you think?

 

Here are the forumulas to calculate tire diameters, RPM and MPH with different combinations:

Tire size/25.4 x aspect ratio x 2 + wheel size = Tire Height Example for 235/70-16 tire = 235/25.4 x 70 x 2 + 16 = 28.95 tire diameter

MPH x Transmission Gear Ratio x 336.14 x Axle Ratio / Tire Dia = RPM

RPM x Tire Dia / Axle Ratio / 336.14 /Transmission Gear Ratio = MPH


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97 4.6 F150, 1/8 = 10.885 @ 64.10 mph, 88 5.0 Mustang 1/8 = 7.191 @ 94.76 mph

 

Neal, Hi!I want to kindly ask you for your opinion on gears as well. I have a 97 F-150 SC 4x4, 4.6L, 3.55 axle. Recently, I bought new tires. Went from stock; P235/70r16 to P255/70R16. How much HP did I lose and will my fuel economy suffer as well? How far will my speedo be off? To compensate for power loss, can one add a K&N filter or K&N FIPK to gain some Torque or Horsepower back? Is it easy to install? Not a mechanic but willing to try as long as I don't screw something up. Will going from 3.55 gear to 3.73 help or will it matter all that much if I stay with the present setup? Hopefully you or someone can kindly respond. Thanks!!

 

HI!... TEEDO :Your stock 235-70-R16 tires are 28.95 inches tall. Your new 255-70-R16 tires are 30.06 inches tall. That's a 1.11 inch difference. Youe new 30.06 are making your 3.55 gears feel like a 3.42 ratio. If you install 3.73 gears with your 30.06 tall tires, the 3.73's will feel like a 3.59 ratio. If you install 4.10 gears with your 30.06 tall tires, the 4.10 gears will feel like a 3.95 ratio.If you want to get back to your origanal gearing then install a set of 3.73 gears. But if you would like a little bit better "GET UP, AND GO" then I would go with the 4.10 gears. By changing your tire size you DON'T loose engine H.P. Your engine is still making the samw power, it's just been mathmatically changed by your gearing. It's hard to explain to someone. I could, but it would take up way too mush space!LOL! By all means though, go get some extra h.p with aftermarket performance products. SUPERCHIP 1ST! (HINT)

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NEAL [ the horsepower freak ] NEWMAN
'99' F-150 XLT SPORT, oxford white, reg cab shortbox stepside,5.4, auto, 4.10L.S, captain's chairs, bedliner, GTS carbon fiber headlight covers, ***** CEPECK clear halogen driving lights, GTS slotted tailight covers (painted oxford white), fiberglass smooth wiper cowl (painted OXFORD WHITE), FORD locking lug nuts, tinted windows,true duel exhaust with 2.5 inch mandrel bent pipes and FLOWMASTER 3 chamber mufflers with 3' tailpipes exiting before the rear wheel like the LIGHTNING, HELLWIG rear stabalizer bar, 3 AUTOMETER guage pods, filled with tranny temp, engine temp, and oil preasure AUTOMETER "PHANTOM" guages,custom fabricated air intake trac and huge K/N filter, TPS mod, BELLTECH 2-inch rear drop, custom programed SUPERCHIP, modified POWERAID spacer, BAUMANN ENGINEERING shift kit (on stage 5 setting)BYPASS CLUTCH CONTROL VALVE/PREASURE REGULATOR VALVE, ASP POWER PULLEYS, custom tig welded and ported JBA "JET BLACK coated headers, twin DERALE 16 INCH ELECTRIC FANS, PERMA COOL 14"/10" tranny cooler with 10" electric fan. FUTURE MODS : FORD SVT 24LB INJECTORS, BBK 75MM THROTTLE BODY, AADI F1 RAM AIR HOOD, traction bars, and a KENNE BELL BLOWZILLA supercharger.
ESTIMATED H.P TO DATE : 345H.P / 425ft/lbs of torque.

OTHER TOYS : "83" PRO STREET FORD RANGER : 351-w stroked to 408c.i 625H.P (natural), 875H.P with 250H.P "BIG SHOT" N.O.S kit, tubbed (crome moly tubing), 12 point chrome moly roll cage, 4-link with coil overs, MUSTANG II front suspension, c-4 tranny (race prepped), 4000rpm stall converter(8 INCH), 3" chrome moly driveshaft,AUTOMETER guages, 15.50 MICKEY THOMPSON rear tires, 4" M/T front tires, CENTERLINE CON-VO PRO rims, fiberglass hood - bumper - prostock hood scoop, wishbone trac-link, two chrome moly driveshaft loops, 16 gallon RCI fuel cell,etc