Gear Ratio
I'm thinking of throwing some bigger tires on the s-crew and I would reall rather not spend the money on new gears. I have a 5.4 and I know a 3.73 ratio was an option, but I did not buy the truck new so I am not sure what it has. Is there an easy to find ID tag somewhere?
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There's an axle code on the driver's side door jamb sticker. Post the code here or search the code list. You can find the "actual" ratio on a metal tag under one of the differential cover bolts. It will be the first numbers on the lower of 2 rows of information.
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Here is what the axle codes are:
19 = 3.55 open H9 = 3.55 LSD 26 = 3.73 open B6 = 3.73 LSD 27 = 3.31 open 18 = 3.08 open 25 = 4.10 open B5 = 4.10 LSD |
Thanks, I've got the 3.55 limited slip. Any words of wisdom on the biggest tire to run with a 5.4 and 3.55 gears?
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If you do any towing or hauling, then I'd stick with a 31" tall tire (265/75/16). But, if you don't, then I'd say a 33" tire would be ok (285/75/16)......
Either way, if you have the stock 255/70/16 tires (~30") you'll have to recalibrate the speedo. It also makes a difference in how the trans shifts as well...... Good luck! |
I agree with Mitch on the sizing. I have 3.73 gears and 32.7" tires and want more perfomance. What size do you have now?
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I've got 265/75/17 (31") now and I two around a 3800 lb boat quite a bit. I guess if I want to go with a lift an run a bigger tire, I'll have to suck it up and re-gear. Thanks for the help guys.
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