Jeep Wrangler Forum - Reply to Topic
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ General Discussion Forum > 99 TJ 33's best gears?

Join Wrangler Forum Today


Thread: 99 TJ 33's best gears? Reply to Thread
Title:
  
Message:
Post Icons
You may choose an icon for your message from the following list:
 

Register Now

In order to be able to post messages on the Jeep Wrangler Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Additional Options
Miscellaneous Options

Topic Review (Newest First)
08-17-2013 02:35 PM
Jerry Bransford
Quote:
Originally Posted by JohnDoe View Post
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.
08-17-2013 02:30 PM
JohnDoe Just talked with a guy at collinsbrothers, if your jeep is a dd and running 33's, 4.10 is the way to go.
08-17-2013 01:25 PM
Jerry Bransford
Quote:
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.
08-17-2013 01:23 PM
Notoriously_rob So auto is 4.10 and ax15 is 4.56?

Confused
08-17-2013 01:20 PM
JohnDoe
Quote:
Originally Posted by Jerry Bransford View Post
What transmission do you have?
manual
08-17-2013 01:19 PM
Jerry Bransford
Quote:
Originally Posted by Notoriously_rob View Post
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.
08-17-2013 01:18 PM
Notoriously_rob Everyone on here says 4.56 is optimal for 33s.

4.88 is optimal for 35s
08-17-2013 01:17 PM
Jerry Bransford
Quote:
Originally Posted by JohnDoe View Post
4.0 33's mostly street some crawling, I was thinking 4.10?
What transmission do you have?
08-17-2013 01:15 PM
JohnDoe 4.0 33's mostly street some crawling, I was thinking 4.10?
08-17-2013 01:02 PM
TJTim316 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
08-16-2013 12:05 PM
Big Cole
Quote:
Originally Posted by celticsfan View Post
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.
08-16-2013 11:27 AM
celticsfan
Quote:
Originally Posted by Big Cole View Post

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?
08-16-2013 11:02 AM
Big Cole
Quote:
Originally Posted by celticsfan View Post
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
08-16-2013 10:58 AM
celticsfan 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.
02-20-2013 05:16 PM
SpoiledRotten
Quote:
Originally Posted by TJTim316 View Post
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.
02-20-2013 04:53 PM
OMGJeepin
Quote:
Originally Posted by JaxJaguars
2.5l - 4.88

4.0l - 4.56
I have 4.56 locked and I love it.
02-20-2013 02:03 PM
TJTim316 On the subject of gears, anyone having any issues with USA Standard or Motive Ring and pinions
02-18-2013 09:14 PM
Greengoblin98
Quote:
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.
02-18-2013 09:01 PM
SpoiledRotten Thanks, Jerry!
02-18-2013 08:58 PM
Jerry Bransford
Quote:
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.
02-18-2013 08:56 PM
Greengoblin98 Also sorry for playing 20 questions with you!
02-18-2013 08:55 PM
Greengoblin98
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?
02-18-2013 08:51 PM
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.

Engine RPMs with a properly calibrated speedometer would be 2800 at 65 mph if you have 4.10 gears in the axle.

The operative words being 'calibrated speedometer'. Use a GPS to compare what it says compared to what your speedometer says.
02-18-2013 08:45 PM
Greengoblin98
Quote:
Originally Posted by Jerry Bransford
What size tires are you running, what transmission do you have, what model year is your TJ, and have you recalibrated your speedometer so it is accurate with the size tire you are running?
32x11.50r15, 3 speed auto, 98 Sahara, and I have no clue. Bought with lift and everything already on it.
02-18-2013 08:44 PM
Greengoblin98 I also have 4.0 3 speed auto.
02-18-2013 08:43 PM
Jerry Bransford
Quote:
Originally Posted by Greengoblin98 View Post
I'm in the same boat but I'm actually wondering what my ratio is. I thought I had 3.73 but people with that have lower rpms than I do at 65 mph. Somebody with 3.73 with 32x11.5r15 at 65 mph is around 2400 rpm. With that same combo, I'm around 2800 to 2900 rpms. Wa wonderibg what ration I had.
What size tires are you running, what transmission do you have, what model year is your TJ, and have you recalibrated your speedometer so it is accurate with the size tire you are running?
02-18-2013 08:42 PM
Jerry Bransford 4.56 is the ideal street/trail ratio for 33" tires, 4.0L engine, and 5-speed manual transmission.
02-18-2013 08:42 PM
Greengoblin98 I'm in the same boat but I'm actually wondering what my ratio is. I thought I had 3.73 but people with that have lower rpms than I do at 65 mph. Somebody with 3.73 with 32x11.5r15 at 65 mph is around 2400 rpm. With that same combo, I'm around 2800 to 2900 rpms. Was wondering what ratio y'all thought I had.
02-18-2013 08:40 PM
SpoiledRotten I think I had 4.56 and 4.88 mixed up. I surely wouldn't want to do 4.88 unless it was a dedicated offroad vehicle, right? Either 4.10 or 4.56? I wouldn't mind having enough gear for 35s if I went that way later.
02-18-2013 08:33 PM
1jeeplvr
Quote:
Originally Posted by Wesboy View Post
I've just put 4.10's in my '97 3 speed auto and the RPM's on the highway are MUCH higher.
65mph=2800RPM
70mph=3000RPM
75mph=3250RPM

On the plus side,
Off the line is much faster - should be handy for drag racing

There is no more constant downshifting on steep hills and headwinds.

Offroad is amazing. I can now do steep tricky descents without being on the brakes constantly.
It's great to be able crawl in low range again, without the Jeep wanting to run away from you.

When I had the old ratios (3.07's) often had to have the pedal to the metal just to maintain speed if I was on the highway and punching a headwind or going uphill.
Now I'm using a lot less accelerator but as stated above, RPM's are much higher (on the highway).
Just had my 4.56 gears installed on my 4.0,5sp & havent wheeled it YET but on road is night and day.I never thought I would be able to accelerate up a hill in 5th gear
This thread has more than 30 replies. Click here to review the whole thread.

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


All times are GMT -5. The time now is 08:40 PM.



Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC