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Old 10-09-2013, 12:10 PM   #1
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Gear swap in put.

Hey fellas, I am looking to get some input from you all. I am wanting to swap out my gears in the diffs. Currently I have 3.55, NP435 tranny, and NP205 TC. I am trying to decide between 4.10 and 4.56. I am running 33x14.5 STS's now. I am not sure if i will change to 35's the next time I need tires or stay with 33's. I have looked at gear ratio/rpm charts, but I would like to get some input from guys that have similar set ups. I drive my jeep on both road and off.

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Old 10-09-2013, 03:15 PM   #2
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what engine

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Old 10-09-2013, 05:18 PM   #3
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I run 4.56 with 35's. a little less speed off the line but better mpg. At highway speed it is perfect.
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Old 10-09-2013, 05:42 PM   #4
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Im running the 435 tanny with 456, originally I was running 33" tires with the 5 speed, when i did the tranny swap I lost the highway, and went to 36" swampers. Now Im running 37's and its very comfortable on the highway.
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Old 10-09-2013, 06:45 PM   #5
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It has 4.0L. What speeds one the highway and rpm's?
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Old 10-09-2013, 06:59 PM   #6
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I have a 4.0 with 3.55's pulling 33's..it accelerates good and has a hell of a road gear....I have another one with 4.56 gears and 37's which is a good match but I have a near 400 horse 350 pulling them
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Old 10-09-2013, 10:56 PM   #7
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Originally Posted by YelloJ74 View Post
It has 4.0L. What speeds one the highway and rpm's?
im running about 25k @ 65 3k @ 80 I kept the rpm's around 28. It's kind of the sweet spot on my engine.
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Old 10-10-2013, 11:22 AM   #8
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Cool. That is what i am looking for. How about off road performance?

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