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  #1  
Old 08-25-2013, 10:35 PM
Mkay1185 Mkay1185 is offline
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I didn't pay attention to my factory gear ratio (3.21) when I lifted my truck with 35s and heavy 20x12 wheels. On highway driving the truck never goes into 6th gear and while towing the highest gear is 4th. I do not wanna fry my transmision so what's the best rear end ratio for both city and highway driving
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Old 08-25-2013, 10:40 PM
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Old 08-25-2013, 11:48 PM
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A shift to a 4.10 will be a huge improvement from the 3.21s, but I wouldn't go 4.56 with only a 35" tire or you'll be running out of RPM at highway speeds.
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Old 08-25-2013, 11:53 PM
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I thought the 3.21's were only available on 2 wheel drives? I like my 3.92's
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Old 08-26-2013, 12:56 AM
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Where can you find out what gears you have?
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Old 08-27-2013, 10:06 AM
Black5.7 Black5.7 is offline
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There should be a tag on your rear diff. I'm sure there are other places that I am not aware of though.
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Old 08-28-2013, 12:55 PM
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Quote:
Originally Posted by CdnoilRAM View Post
A shift to a 4.10 will be a huge improvement from the 3.21s, but I wouldn't go 4.56 with only a 35" tire or you'll be running out of RPM at highway speeds.
This ^^^ right here.
ESPECIALLY if its a daily driver and if you do not plan on racing it.

I ran 35's through winter and I was revving quite high driving 60-70 mph which hurt my MPG
4.10s and 35's is a match made in heaven. Again for daily driving and not racing
But who would race with 35's...lol
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