33s" or 35s"
Yeah it's a long...bed =P
Joined: Jan 2009
Posts: 136
Likes: 0
From: Santa Clarita, Ca.
Friend of mine has a 02 screw 4.6 on 35's with 3.55 gears. It is the slowest truck ever i swear. 5.4 should do better but your just gonna wear out your trans unless you get 4.30's for 33's or 4.56's for 35's
Thread Starter
Junior Member
Joined: Apr 2009
Posts: 21
Likes: 0
From: Vancouver, Canada
Finding out your axle ratio is popular these days. Let me see. On your door jam there should be a chart with an area titled "Axle Code". Write it down then compare to this list, it should be a 2-digit code.
If your axle code is two numbers you do not have Limited Slip (i.e. - 35, 29, etc). If your axle code is a letter then a number you have Limited Slip (i.e. H5, B9, etc). So the first digit basically tells you if you have LS or not. The second digit tells you what ratio you have.
If the 2nd digit is a 7 then you have 3.31.
If the 2nd digit is a 9 then you have 3.55.
If the 2nd digit is a 6 then you have 3.73.
If the 2nd digit is a 5 then you have 4.10.
Your friend more than likely does not have stock 4.10. The 4.10 only came in 7700 Heavy Duty payload package, which is only offerred in Rcab Long Bed form if memory serves me correctly. The Scabs have most commonly come with 3.55s and Screws with 3.73s, but like said before, I have seen some Scabs with 3.73s and Screws with 3.55s, but those are few and far between.
Hope this helps.
If your axle code is two numbers you do not have Limited Slip (i.e. - 35, 29, etc). If your axle code is a letter then a number you have Limited Slip (i.e. H5, B9, etc). So the first digit basically tells you if you have LS or not. The second digit tells you what ratio you have.
If the 2nd digit is a 7 then you have 3.31.
If the 2nd digit is a 9 then you have 3.55.
If the 2nd digit is a 6 then you have 3.73.
If the 2nd digit is a 5 then you have 4.10.
Your friend more than likely does not have stock 4.10. The 4.10 only came in 7700 Heavy Duty payload package, which is only offerred in Rcab Long Bed form if memory serves me correctly. The Scabs have most commonly come with 3.55s and Screws with 3.73s, but like said before, I have seen some Scabs with 3.73s and Screws with 3.55s, but those are few and far between.
Hope this helps.
Justin
Joined: Apr 2008
Posts: 2,758
Likes: 8
From: Denver, CO
Your 3.55s will turn 33s and 35s, you'll just notice a significant decrease in acceleration. A previous poster suggested possibly moving to 4.30s, but last I checked they don't make front gears for 4WD's on the F150, so if you upgrade you may want to go with 4.10 at a minimum or 4.56s. Upping to 3.73s would simply be a waste of money since you wouldn't see a significant enough increase. Keep in mind this could decrease your mpgs due to the motor running at higher rpms, especially on the highway. But you will like the increased acceleration power these gears will give you. Either way I'd start a budget for gears to keep from straining the trans too much for too long.
