ok, as most of you guys know, i bought my 03 L used with about 330 miles on it. guy just wanted a bigger truck. he modded it a little bit (check out my sig). if i remember correctly, on my 2000 5.4 4x4 when i was going 70mph i was right at 2k rpm. that truck i know for fact had 3.55's. today, i was going exatcly 70mph in my L, and running around 2300 rpms. this leads me to believe that the guy before me put in 3.73's? anyone have any ideas?

 

Stock 03 gears are 3.73s. He may have put in 4.10s. I assume you are running a stock tire? If you want to check and don't mind getting a little dirty, pull the rear end cover off and count the ring gear teeth and the pinion gear teeth and divde for your gear ratio. Or you could find someone with anohter 01-03 and just do a tandem 50-60mph cruise next to them and compare.

 

well dont i feel dumb. new to the lightning world, so i didnt know i had 3.73's in there. thought i had 3.55's. cool! well at any rate, does that rpm range at 70mph sound right for 3.73's? also yes i have the stock eagle f1's

 

yeah, that sounds about right where i am....(03 clearcoat black)......

DarkShadow03 - dude when are you hooking up your L with a chip, CAI and a pulley... you'll be suprised how much it helps.....

 

yep. Go for it man, just warning you, once you start you can't stop!
Shane

 

I have stock 03 L and 70 is like 2250 or so, so yours sounds right.

 

ok, cool. thanks guys for the help. it just threw me off a little when i was crusin down the highway and noticed the rpms seemed a little higher than they used to be. anyway, i know about the mod bug. tomorrow (if my gf finds out about this im dead ) i will be calling jdm. god knows whats gonna happen after that

i like this truck, but as they say

"there's no replacement for displacement"

take that all you 1.6L rice burners!!!

 

Yeah that sounds about right. I've got a 2000 with 3:55's. I checked it last night. Going 70 miles per hour my rpms are either right above 2000 or a little below 2100. With your 3:73 you're only at 2300 that's not as much of a difference as I thought...
Shane