I have 4.6L V8 with 3.55 gears. Would I have to regear to 4.56 if I put 35's on with a lift?

 

Would you HAVE to? No.

Would you WANT to? Probably!

4.10's are also a good option...

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-JonC-
*Silver 2000 4x2 F150 Supercab
*4.6L Triton V8
*315/75/16 Pathfinder ATR's
*16 x 8 Panther Custom 108's
*K&N GenII FIPK
*Custom Cat-back w/ Flowmaster 50 Series
*Fabtech 6.5" "Ultimate" suspension lift
*Smittybilt nerf bars
*Extang Black Max soft tonneau
*Stull billet grille
*Clear corners
*Heckethorn steering stabilizer

 

I tell you what, after having 35" on for over two weeks now, I can say that I was scared that my truck was going to run like a dog. But to my surprise its really not that bad. I will regear in a couple of months (hopefully about 2) when I get 36's put on, but Im pretty content running 35's with 3.55 gears at the moment.

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Black 1997 F-150 Extended Cab
4x4 w/Off-Road Package
5.4 liter Triton V8
Luverne Stainless Steel Nerf Bars
DeeZee Silver Series Toolbox
Grizzly Oval Style Chrome Grill/Brush Guard
Wrap around bug shield
Ventshade Ventvisors
Ford Factory Bedliner
Pioneer Deh-P6000 45 Watt CD Stereo
3" Trailmaster Body Lift
Smittybilt Outland Tail Light guards.
16x10 American Racing Polished Atlas Wheels
4 315/75R16 BF Goodrich All-Terrain TA/KO Tires on all four corners.
Flowmaster 50 Muffler w/Dual Pipes & 2 18" Stainless Tips
MTX 2 Channel Amp w/Crossover
2 MTX 10" Subwoofers w/Box
Next Up: 4" Rancho Suspension Lift

 

To get it back to stock performance with 35's, 4.10's are just right. 4.56's will increase takeoff.

4.56's are better to compensate when you start hitting the 37-39 range.

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'98 Ford F-150 S/C ORP
4.6L, 3.55LS, AT,
Teal with silver two-tone
Delta Flow 40-Series Flowmaster with dual rear exit, Hypertech Power Programmer, Clear Corners, Clear Taillights(before ticket), AirForce One FIPK, Superwhite head and fog lights, Billet Grille w/ bumper insert, Lighted Logo on grille, Westin PCS nerf bars, Granatelli MAS, JL Audio Stealthbox w/ two 8's, Pioneer 3-way 6x9's, two Kicker Amps
4.10LS, 5" RCD lift, 3" Performance Accessories body lift, Gap Guards, Chrome Traction Bars (Rancho), 16x10 Eagle 1439's, 315-75/16 Pro Comp A/T




http://albums.photopoint.com/j/AlbumIndex?u=1434673&a=10754263

 

offroad guy,
A 4.10 ratio would make your truck feel the same as stock (about same effective gear ratio). This being true, you wouldn't even need to change out your speedo gear.
-Michael

 

I am not positive, but I think that the 97's and up don't use a speedo gear. I think any recalibration has to be done using something to modify the computer.

Correct me if I am wrong.

Also Fireman, I thought the same thing with my jeep. I had a 98 jeep and lifted it and put 33's on it and then I changed out the gear ratio. I went to 4.10's in order to retain about the same rpm as stock at highway speeds. I thought by doing this the speedo would be very close to the same as when stock.

With just the tire change the speedo was off about 8% or so. After the gear ratio change my speedo was off by about 15-20 percent. It really threw it out of whack. Luckily on that jeep it was about a five dollar part from the dealer to correct the speedo and took about two minutes to install.

Anyway I may be wrong, but that was my expereince.
Paul