I need help!

I am in the same boat, and even odder is are first names are exactly the same. After lots and lots of research and pestering guys at poly performance, this is what I decided on.

Pro Rock 44 front end
Yukon 4.56 gears
ARB Locker up front
Cable activated Ox locker rear
New axles in the rear
And working out the details on going to a long arm suspension

I'm never going bigger than 35's. Stage 2 of that project is an atlas 4 speed transfer case, which eliminates the need for gears any lower than 4.56.

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I see you are in Cali. you have a 2013 (penstar) and an Automatic trans. (WA580)... We the people will always have opinions, I for example live at 9000ft. in elevation and drive daily in the mountains, while another guy will live in Kansas and drives his beloved jeep on predominantly flat ground at 2400ft. in elevation. My last jeep (2015 rubicon with 37s and an Auto) had 5:13 gears and was great at elevation (9000ft.) but was horrible if the max speed limit was above 65mph. I think you really have to ask yourself a few questions, and the answer to those questions will give you your answer... Good luck and enjoy that jeep

1. Are my tires really 35 inches tall or it that just what the manufacture molds on the sidewall
2. what kind of driving am I going to do and were (a lot of highway at 75 plus on flat ground or 55 in mountain passes pulling a small trailer)

Then disregard people like me who have purpose built jeeps and the only thing more expensive in the driveway than their jeep is the converted Kenworth we use to pull the stacker trailer our jeeps call home when traveling.

Gears are a must when you swap the minimalist circumference of stock tires for something more robust, they relieve stress on the drivetrain, allow your motor to operate at a nominal RPM with larger tires and relieve your wallet of cash... Most of us with jeeps have had to ask ourselves the same question as your asking, no shame in that. I personally am a fan of 5:13s and 5:38s, but I also have 40 inch tires, a trany. with an appropriate overdrive ratio and a hemi to suck fuel and create carbon monoxide in great quantities...

Look up a RPM calculator and pick a ratio that best suites your overall needs, the penstar is a good motor, the auto has a slight overdrive and most manufactures of tires lie about the size. 4:56 is my guess unless you don't drive over 65mph, and OMG, LOCKERS, YYEESSSS.... then go have fun, you worked hard for it, every damn day you go to work think about the fun your going to have with your jeep when your not working..... and always remember, forums are good, jeeps are great and your opinion is all that really matters..........
 
ravenmad said:
I see you are in Cali. you have a 2013 (penstar) and an Automatic trans. (WA580)... We the people will always have opinions, I for example live at 9000ft. in elevation and drive daily in the mountains, while another guy will live in Kansas and drives his beloved jeep on predominantly flat ground at 2400ft. in elevation. My last jeep (2015 rubicon with 37s and an Auto) had 5:13 gears and was great at elevation (9000ft.) but was horrible if the max speed limit was above 65mph. I think you really have to ask yourself a few questions, and the answer to those questions will give you your answer... Good luck and enjoy that jeep

1. Are my tires really 35 inches tall or it that just what the manufacture molds on the sidewall
2. what kind of driving am I going to do and were (a lot of highway at 75 plus on flat ground or 55 in mountain passes pulling a small trailer)

Then disregard people like me who have purpose built jeeps and the only thing more expensive in the driveway than their jeep is the converted Kenworth we use to pull the stacker trailer our jeeps call home when traveling.

Gears are a must when you swap the minimalist circumference of stock tires for something more robust, they relieve stress on the drivetrain, allow your motor to operate at a nominal RPM with larger tires and relieve your wallet of cash... Most of us with jeeps have had to ask ourselves the same question as your asking, no shame in that. I personally am a fan of 5:13s and 5:38s, but I also have 40 inch tires, a trany. with an appropriate overdrive ratio and a hemi to suck fuel and create carbon monoxide in great quantities...

Look up a RPM calculator and pick a ratio that best suites your overall needs, the penstar is a good motor, the auto has a slight overdrive and most manufactures of tires lie about the size. 4:56 is my guess unless you don't drive over 65mph, and OMG, LOCKERS, YYEESSSS.... then go have fun, you worked hard for it, every damn day you go to work think about the fun your going to have with your jeep when your not working..... and always remember, forums are good, jeeps are great and your opinion is all that really matters..........
Click to expand...

Thanks I definitely think about this everyday while I'm at work


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I just put 4.56 in my 13 sport with 35s (measured @ 34.5) Unbelievable difference over the 3.21. I do a lot of highway driving so 4.88s would run the rpms too high for me. That chart from earlier post seems about right.

Don't forget to program the computer. you'll be rushing to find something asap when you go into limp mode...I know from experience [emoji6], happened the day I drove it home.

Also, while you are in there, replace your axle seals especially up front. They are a pain to get to, gotta remove the axles and carrier. It's worth the extra piece of mind.

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JONORTIZ26 said:
Yea I don't plan on going bigger than 35s since it's my daily driver
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Click to expand...


Daily Driver? I would stick with 4.56, that will keep your mpg up and still be acceptable if you ever go with bigger tires.

notnalc68 said:
Regear and lock the rear with something like an ARB. Put gussets on the front, and leave it open.
http://wayalife.com/showthread.php?42988-Detroit-locker-help
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Click to expand...

Rear Locker and front gussets for the D30 (until the 30 gets upgraded)? Hmm, Not a bad idea. Now I know what my rig needs!
 
Mybadjk said:
Running 4.56 with 37s and range from 16/17 with 3.6 auto
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Click to expand...

Now were getting down to the meat and potatoes of any DD. I'm also getting 16 to 17 mpg on 35" and 3.21 with the 3.6 auto. I'm concerned what 4.56 will do on 35s. Anyone with that setup? I would assume its negligible, but peace of mind would sure help me.
 
Sgt EriK said:
Here this may help...
Click to expand...

SgtErik,Where the hell did you get that chart?
Google image search points to mrwBronco.com, a Page about a '78 Ford Bronco named Honey.
WaybackMachine shows the last time it was up in '06, and that old page mentions superlift.com
I dont see where superlift is in to gearing.

I wouldnt trust any chart without references to what it is for. Engine size, tranny ratio, Trans ratio...
 
Last edited:
Frydaddy said:
SgtErik,Where the hell did you get that chart?
Google image search points to mrwBronco.com, a Page about a '78 Ford Bronco named Honey.
WaybackMachine shows the last time it was up in '06, and that old page mentions superlift.com
I dont see where superlift is in to gearing.

I wouldnt trust any chart without references to what it is for. Engine size, tranny ratio, Trans ratio...
Click to expand...
Agreed - this chart doesn't appear to be correct. 5:13s and 37s and my rpms aren't 3k.
 
warthog13 said:
I just put 4.88's in my JKU. I'm on 35's running 2k rpm's at 70. I did hook up my tuner and change the shift points and tire size in the computer.

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Click to expand...

the_debtenator said:
That's a very low rpm for 70


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Click to expand...

I agree. That seems really low. I still have 4.10 gears, in this one with 315/70r17. My RPM is around 2400 at 70 mph


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