Ok. So I've got a 97 F150. V6 reg cab, etc(see sig). I got my 33x1250x16's and now my truck is even slower than before. And on top of that, the speedo is off. I want to change my gears because I heard thats the best way to return it to stock. I'm not sure which gears I have now, the 3.08 or the 3.55, and what should I change to 3.73 or 4.10? Also I don't know that size of my rear end (7.5", 8.8", etc) Can anyone help me out with what is on there now, and what I need to put on to get it back to stock or better?! ANy help is appreciated!

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1997 Ford F-150
4.2 L V-6
Thrush Turbo Tube catback exhaust
K&N Air Filter
Window Tint
Pioneer 7000R CD player
2 Rockford Fosgate DVC HX2 10's
Rockford Fosgate 500a Amp
Lund bug shield
Vent Shade Vent Visors
GTS headlight blackouts
Bedliner
Chrome Toolbox
3" Body Lift
305/70R16 ProComp Muds
16x10 Eagle 589
Chrome Westin Nerf Bars
Custom Key racing stripes down both sides thanx to some a**hole in the HS Parking lot.
My WebPage

[This message has been edited by Mav07 (edited 01-29-2001).]

 

Mav07- If you want to know what gear ratio that you have now, you can look at the axle code on your door (post it/or search previous posts for codes), or you can get the actual code off of the axle tag on one of the cover bolts.

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2000 F-150 XL, RC, LB, 5.4L, 4R70W, 3.55LS,
Class III tow, Payload #3, & Convenience pkgs.,
4-wheel disc/ABS, Chestnut/Parchment 40/60,
Ford bedliner w/Paintsaver & gas/wheel/spare locks,
K&N F.I.P.K. w/Outwears pre-filter, Superchip,
Dynomax ultra-flow welded 3" cat-back w/ 3" Y-pipe,
Hellwig front & rear anti-sway bars, Rancho RS 9000s,
Mobil 1, K&N oil filter.

 

OK. I looked on the door and there were a bunch of numbers and stuff there. So I'm just gonna type it like I saw it!

WB / BRK / INT TR / R / AXLE / TR / SPR
120/ B / CX / 9 / 18 / U / LF


- Yeah, I was thinking they were 3.55, but I saw some posters with 3.08 gears. My truck was basically bone stock when I got it so I figured the gears were 3.08. I have no Idea what size the rear end is though. Can someone with this expertise let me know what all those #'s mean in english??


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1997 Ford F-150
4.2 L V-6
Thrush Turbo Tube catback exhaust
K&N Air Filter
Window Tint
Pioneer 7000R CD player
2 Rockford Fosgate DVC HX2 10's
Rockford Fosgate 500a Amp
Lund bug shield
Vent Shade Vent Visors
GTS headlight blackouts
Bedliner
Chrome Toolbox
3" Body Lift
305/70R16 ProComp Muds
16x10 Eagle 589
Chrome Westin Nerf Bars
Custom Key racing stripes down both sides thanx to some a**hole in the HS Parking lot.
My WebPage

[This message has been edited by Mav07 (edited 01-29-2001).]

[This message has been edited by Mav07 (edited 01-29-2001).]

[This message has been edited by Mav07 (edited 01-29-2001).]

 

Axle code of 18 means open differential (not a posi unit) gear ratio of 3.08.

TD

 

Your truck should have an 8.8" rear diff. For 33" tires, I went with 4.10s to get me close to the stock 3.55s w/ 255/70R16 tires. If you want a little better acceleration, then consider 4.30 or 4.56 gears. Of course, the trade-off will be less economy. To get your speedo correct, you may have to purchase a new plastic gear. They are pretty cheap ~$10.


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1997 4x4 Expedition- 4.6L, true dual exhaust w/Ravin DI/DO, K&N air filter, SuperChip, airbox mods, Edelbrock shocks, 285/75R16 BFG ATs, 2000 F150 "XLT" wheels, 4.10 gears, Auburn LS, Clarion In-dash CD player, Smitty Bilt push bars and nerf bars.

2000 4x4 F250 SD XLT SuperCab SWB- 6.8L, Offroad Pkg, Camper Pkg, 4.30LS, Tape & CD player, Remote Keyless Entry, Sliding back glass, tinted windows, 265/75R16 OWL tires, Smittybilt nerf bars & Line-X bedliner.

NoMo's site

 

and a 8.8" rear-end