Rear end

[Scotty_12]

good morning guys. Just wondering how to figure out what rear end I have? I have looked in the glove box but nothing was there.it be on the sticker on the driver side door?

 

[moezer]

Like what axle ir gears

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[Scotty_12]

3.73 4.10 ect

 

[moezer]

Call dealer with the vin or there should be a tag on the back of the diff or u can lift the rear and slin the wheels and see how many times the drive shaft spins for 1 full rotation

Or take the cover off, most r 355 tow packages 373s or 410s

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[Scotty_12]

Thank you

 

[moezer]

Best easy way if u font have ur tag on the diff then call dealer with the vin

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[Scotty_12]

Thank you. Just found out it has a 3.55. Witch not sure if that good or bad.

 

[Scotty_12]

Also the truck came with 17's and when I bought it it had 20s. But the speedo is correct per GPS. Would I be better off going back to 17s?

 

[Karlsweg]

17s get a little better mpg.

 

[Smokeybear01]

If the speedo is correct according to your GPS then the diameter of the tires on it must be the same as the 17's it came with stock. The 20's must be low profile and the 17's not so much so they equal in diameter (height-if sitting side by side). Why would you want to swap back? Unless the 17's offer more hauling capacity or something that you need.

 

[moezer]

17s will just have more rubber then the 20s, an E rated tire is what's recommended to safely tow with for stocks tow limit

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[HemiLonestar]

What tire size did the 20's come with? Stock 20 size for 2002-2003 was 275/55R20. In 2004 it was changed to 275/60R20.