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Old 02-18-2013, 08:55 PM   #31
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Quote:
Originally Posted by Jerry Bransford
With a properly calibrated speedometer, your engine should be turning over 2550 RPMs at 65 mph with 32" tires, 3-speed automatic, and 3.73 axle gearing.
Thanks Jerry! Everything else was done correctly so if they did happen to reclibrate, what ratio would cause me to have that high of rpms?

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Old 02-18-2013, 08:56 PM   #32
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Also sorry for playing 20 questions with you!

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Old 02-18-2013, 08:58 PM   #33
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Originally Posted by Greengoblin98 View Post
Thanks Jerry! Everything else was done correctly so if they did happen to reclibrate, what ratio would cause me to have that high of rpms?
I added another note above that 4.10 gearing would produce 2800 RPMs at 65 mph with a properly calibrated speedometer.
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Old 02-18-2013, 09:01 PM   #34
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Thanks, Jerry!
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Old 02-18-2013, 09:14 PM   #35
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Originally Posted by Jerry Bransford
I added another note above that 4.10 gearing would produce 2800 RPMs at 65 mph with a properly calibrated speedometer.
I'm on my phone but I saw where somebody had mentioned the rpms for 4.10 ratio. Ill look into it more tomorrow. I'm debating between 32s and 33s and trying to make last minute decisions. Thank you so much Jerry.
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Old 02-20-2013, 02:03 PM   #36
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On the subject of gears, anyone having any issues with USA Standard or Motive Ring and pinions
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Old 02-20-2013, 04:53 PM   #37
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Originally Posted by JaxJaguars
2.5l - 4.88

4.0l - 4.56
I have 4.56 locked and I love it.
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Old 02-20-2013, 05:16 PM   #38
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On the subject of gears, anyone having any issues with USA Standard or Motive Ring and pinions
I did some research and found that from Advanced Auto Parts, the Motive gears have a 90 day warranty, the USA Standard have a one year warranty, but you can find them with 5 years warranty for about 30.00 more. That is the route I'm going. Not getting something with a short warranty since that tells you how long they expect them to last.
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Old 08-16-2013, 10:58 AM   #39
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Bringing this thread back, 4.0 3SPD auto 33s, mostly on road around town some highway and light off reading (mud no rock crawling), 4.10 or 4.56? Looking for something good all around and isn't going to destroy my mpg anymore.
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Old 08-16-2013, 11:02 AM   #40
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Bringing this thread back, 4.0 3SPD auto 33s, mostly on road around town some highway and light off reading (mud no rock crawling), 4.10 or 4.56? Looking for something good all around and isn't going to destroy my mpg anymore.
4.10 is optimal for the 3 speed auto
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Old 08-16-2013, 11:27 AM   #41
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4.10 is optimal for the 3 speed auto
Thank you, so I'm looking at 4.10 upfront and 4.11 in the rear? And if I picked up two tj axles in these ratios how difficult is the swap?
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Old 08-16-2013, 12:05 PM   #42
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Thank you, so I'm looking at 4.10 upfront and 4.11 in the rear? And if I picked up two tj axles in these ratios how difficult is the swap?
Find a 4 cylinder TJ with 4.10s where the owner is upgrading the axles. Another cost efficient method is to order an 8.8 from ECGS, which is much stronger than the D35. The swap will take the better part of a weekend. You should also consider fixing any worn steering components during the swap.

It took me approximately 6 hours to swap in an 8.8 by myself including bleeding the brakes.
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Old 08-17-2013, 01:02 PM   #43
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I can say 4.88's in a 5 SPD 2.5 with 33's is the solid best investment you can make to the Tj. Just did mine last week. She's got new life. Lol
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Old 08-17-2013, 01:15 PM   #44
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4.0 33's mostly street some crawling, I was thinking 4.10?
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Old 08-17-2013, 01:17 PM   #45
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4.0 33's mostly street some crawling, I was thinking 4.10?
What transmission do you have?
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Old 08-17-2013, 01:18 PM   #46
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Everyone on here says 4.56 is optimal for 33s.

4.88 is optimal for 35s
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Old 08-17-2013, 01:19 PM   #47
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Everyone on here says 4.56 is optimal for 33s.

4.88 is optimal for 35s
All that depends on the transmission type and engine, those ratios aren't always the best choices.
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Old 08-17-2013, 01:20 PM   #48
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What transmission do you have?
manual
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Old 08-17-2013, 01:23 PM   #49
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So auto is 4.10 and ax15 is 4.56?

Confused
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Old 08-17-2013, 01:25 PM   #50
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Originally Posted by JohnDoe View Post
manual
5-speed or 6-speed? If it's the 5-speed, then 4.56 is the way to go for 33" tires. If it's the 6-speed, you could get away with 4.10 if it's more of a street Jeep.

Quote:
Originally Posted by Notoriously_rob View Post
So auto is 4.10 and ax15 is 4.56?

Confused
There are two automatics... for 33" tires, you'd want 4.10 if you have a 2002 or older TJ which has the 3-speed automatic. For 2003 and newer which have the 4-speed automatic, then 4.88 is needed for 33" tires.

All of this assumes the 4.0L engine. The 2.5L does better with a lower ratio to boost its RPMs a little higher.
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Old 08-17-2013, 02:30 PM   #51
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Just talked with a guy at collinsbrothers, if your jeep is a dd and running 33's, 4.10 is the way to go.
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Old 08-17-2013, 02:35 PM   #52
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Just talked with a guy at collinsbrothers, if your jeep is a dd and running 33's, 4.10 is the way to go.
The guy at Collins Brothers is giving generic gearing advice. 4.10 is a common ratio for 33" tires for a lot of vehicles & trucks & Billy Bob will often recommend it... but specifically for the Wrangler TJ with the 4.0L engine and 5-speed transmission, 4.56 is the optimal ratio.

Would 4.10 "work"? Yes, but it wouldn't being optimal. 4.10 doesn't quite restore the power, you have to downshift for even minor grades when running 4.10.

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