5.13 gears w/ 6 speed - JKowners.com : Jeep Wrangler JK Forum
 4Likes
Reply
 
LinkBack Thread Tools Display Modes
post #1 of 143 Old 12-18-2011, 07:50 AM Thread Starter
JKO Addict!
 
rdlynch2's Avatar
 
Join Date: Jul 2011
Location: Albany NY
Age: 34
Posts: 3,175
Feedback: 1 reviews
5.13 gears w/ 6 speed

Im curious as to how the daily driveability is with this set up. I have read a few places that some people have to start out in 2nd gear....why would that be?

I have been debating 4.88 and 5.13 for a while now. Dont want to end up making the wrong decision. I am on 35s.

2008 Black 2Dr 6spd D30/44
RK 2.5 X-Factor | Synergy tie rod | 35x12.5 MTRK's | BFH front | Genright rear | Yukon 5.13's | ARB front locker | Warn M8000 w/MasterPull synthetic | Rigid 10'' E-series
rdlynch2 is offline  
Sponsored Links
Advertisement
 
post #2 of 143 Old 12-18-2011, 07:57 AM
Rock God
 
lbeato's Avatar
 
Join Date: Aug 2009
Location: Miami, Fl
Age: 49
Posts: 719
Feedback: 0 reviews

I had 5.13 on 37's on my 08. I liked the set up but I took a hit on gas mileage. And yes 1st was really short. If yours is more of a daily driver especially with 35's I would look more at the 4.88's JMHO. Now with my 12 when I do get my lift and tires (which will be 37's again) I am going to go with 4.88's. I think the 5.13's will be too much.

2012 SLV JK Unlimited Rubicon
lbeato is offline  
post #3 of 143 Old 12-18-2011, 08:55 AM
The Wheelin Man's Friend
 
RiverCityOffroad's Avatar
 
Join Date: Aug 2010
Location: Austin, TX
Posts: 8,649
Garage
Feedback: 60 reviews

I have 37s, 5.13s, and a six speed in my Jeep and I would only recommend 4.88s if your highway speeds are 70+.

There is a small difference in RPMs between 4.88 and 5.13s at about 70 but it's enough to keep you down under 3k rpms.

If your highway speeds average 55-60 then just go 5.13. First will be similar to your Jeep stock. I still use it on mine but you're shifting quick, as in before you get through the intersection.

Why you ask? Because you are tremendously increasing your gear ratio which makes the engine's RPMs climb much quicker.

Marcus


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
RiverCityOffroad is offline  
Sponsored Links
Advertisement
 
post #4 of 143 Old 12-18-2011, 09:20 AM Thread Starter
JKO Addict!
 
rdlynch2's Avatar
 
Join Date: Jul 2011
Location: Albany NY
Age: 34
Posts: 3,175
Feedback: 1 reviews

Quote:
Originally Posted by RiverCityOffroad View Post
I have 37s, 5.13s, and a six speed in my Jeep and I would only recommend 4.88s if your highway speeds are 70+.

There is a small difference in RPMs between 4.88 and 5.13s at about 70 but it's enough to keep you down under 3k rpms.

If your highway speeds average 55-60 then just go 5.13. First will be similar to your Jeep stock. I still use it on mine but you're shifting quick, as in before you get through the intersection.

Why you ask? Because you are tremendously increasing your gear ratio which makes the engine's RPMs climb much quicker.

Marcus
Yeah I don't do much highway driving as is. And if I do it is in the 55-65 range. I drive it back and forth to work/school/appointments, etc. usually all within 15 miles of each other. I would say I put about 10K on a yeah. Lots of stop and go city driving. Usually once a month weekend wheeling adventure. The 5.13s off road I can only imagine how big of an improvement it will make.

2008 Black 2Dr 6spd D30/44
RK 2.5 X-Factor | Synergy tie rod | 35x12.5 MTRK's | BFH front | Genright rear | Yukon 5.13's | ARB front locker | Warn M8000 w/MasterPull synthetic | Rigid 10'' E-series
rdlynch2 is offline  
post #5 of 143 Old 12-18-2011, 02:04 PM
JKO Addict!
 
thedirtman's Avatar
 
Join Date: Aug 2010
Location: southwest reno, nv
Age: 51
Posts: 4,273
Feedback: 0 reviews

2007 2 door 5.13 37" mtr/k 6 speed I don't do a lot of highway driving, get around 15mpg, great off road. I think it is fine driving around town. 1st to 2nd is a quick shift.
thedirtman is offline  
post #6 of 143 Old 12-18-2011, 04:36 PM
JKO Addict!
 
Goodysgotacuda's Avatar
 
Join Date: May 2009
Location: Denton, TX
Posts: 13,230
Feedback: 1 reviews

Gearing thread #5? by the OP. Oy, they say repetition is the best way to learn I guess.

SOLD - '09 2dr Rubicon - 1.0Gal | 6spd | 37s | 4.88s |
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
| OR-Fab cage | Poly Cage | BFH Front | XRC Rear | XRC12 Winch | Walker Evans Beadlocks |

Retired from the Jeep community, for now.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Goodysgotacuda is offline  
post #7 of 143 Old 12-18-2011, 04:48 PM Thread Starter
JKO Addict!
 
rdlynch2's Avatar
 
Join Date: Jul 2011
Location: Albany NY
Age: 34
Posts: 3,175
Feedback: 1 reviews

Quote:
Originally Posted by Goodysgotacuda View Post
Gearing thread #5? by the OP. Oy, they say repetition is the best way to learn I guess.
dude, settle down. does it really bother you that much? i simply want to hear from people who have this gear set, and if they are happy with it, or wished they had gone with something else, for on road purposes at least. this is not something that was debated in my previous threads, the few others i had created before were on transfer case, low end gearing.

2008 Black 2Dr 6spd D30/44
RK 2.5 X-Factor | Synergy tie rod | 35x12.5 MTRK's | BFH front | Genright rear | Yukon 5.13's | ARB front locker | Warn M8000 w/MasterPull synthetic | Rigid 10'' E-series
rdlynch2 is offline  
post #8 of 143 Old 12-18-2011, 05:58 PM
Granite Guru
 
SubCultureNM's Avatar
 
Join Date: Aug 2010
Location: Minot, ND
Age: 46
Posts: 215
Feedback: 1 reviews

I'm running 5.13s with 35-inch KM2s (more like 33.5 inches) in my 6 speed 2011 Rubicon. It took some getting used to, but I like the combination a lot now. I'm turning 3,000 RPM at about 74 mph, so I generally try to keep it at 70 mph. I had them installed in September, I believe, and already have 10,000 miles on them.
Reddogracing likes this.

1997 TJ with LOTS of stuff.
2011 2DR Rubicon with stuff.
2012 JK8 with some stuff.
SubCultureNM is offline  
post #9 of 143 Old 12-18-2011, 06:29 PM Thread Starter
JKO Addict!
 
rdlynch2's Avatar
 
Join Date: Jul 2011
Location: Albany NY
Age: 34
Posts: 3,175
Feedback: 1 reviews

Quote:
Originally Posted by SubCultureNM View Post
I'm running 5.13s with 35-inch KM2s (more like 33.5 inches) in my 6 speed 2011 Rubicon. It took some getting used to, but I like the combination a lot now. I'm turning 3,000 RPM at about 74 mph, so I generally try to keep it at 70 mph. I had them installed in September, I believe, and already have 10,000 miles on them.
Is it the fact that the rpms go up so high, so quickly, that results in it taking some getting used to?

2008 Black 2Dr 6spd D30/44
RK 2.5 X-Factor | Synergy tie rod | 35x12.5 MTRK's | BFH front | Genright rear | Yukon 5.13's | ARB front locker | Warn M8000 w/MasterPull synthetic | Rigid 10'' E-series
rdlynch2 is offline  
post #10 of 143 Old 12-18-2011, 06:37 PM
Granite Guru
 
SubCultureNM's Avatar
 
Join Date: Aug 2010
Location: Minot, ND
Age: 46
Posts: 215
Feedback: 1 reviews

The higher average RPMs took some getting used to. With stock 4.10s and the 35s my sixth gear was virtually unusable. I don't recall what my RPMs were at 75 with stock gears, but they're a hell of a lot higher now (of course). I probably would have been OK with 4.56s or 4.88s, but I wanted to do it once and once only. I may eventually run 37s.
Reddogracing likes this.

1997 TJ with LOTS of stuff.
2011 2DR Rubicon with stuff.
2012 JK8 with some stuff.
SubCultureNM is offline  
post #11 of 143 Old 12-18-2011, 06:50 PM Thread Starter
JKO Addict!
 
rdlynch2's Avatar
 
Join Date: Jul 2011
Location: Albany NY
Age: 34
Posts: 3,175
Feedback: 1 reviews

Quote:
Originally Posted by SubCultureNM View Post
The higher average RPMs took some getting used to. With stock 4.10s and the 35s my sixth gear was virtually unusable. I don't recall what my RPMs were at 75 with stock gears, but they're a hell of a lot higher now (of course). I probably would have been OK with 4.56s or 4.88s, but I wanted to do it once and once only. I may eventually run 37s.
True dat, thats what my thinking has been. I don't want to re-gear and end up regretting not going lower. And, 37s one day, are in my future (hopefully, as long as I can get rid of the turd I have up front).

2008 Black 2Dr 6spd D30/44
RK 2.5 X-Factor | Synergy tie rod | 35x12.5 MTRK's | BFH front | Genright rear | Yukon 5.13's | ARB front locker | Warn M8000 w/MasterPull synthetic | Rigid 10'' E-series
rdlynch2 is offline  
post #12 of 143 Old 12-18-2011, 07:00 PM
JKO Addict!
 
e-jeep's Avatar
 
Join Date: Jan 2010
Location: Stuck walking up the down escalator
Posts: 5,713
Garage
Feedback: 12 reviews

37s; 5.13s; 6 speed ...love it!!

My Build Thread ~
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

NE Trail Ride Thread ~
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Want Jeep Mods? Marcus Has It!! ~ River City Offroad
Adrenaline Offroad
~ Best Jeep shop in the Washington DC area!![/COLOR]
e-jeep is offline  
post #13 of 143 Old 12-18-2011, 07:29 PM
Wheeler
 
Jbsmith44's Avatar
 
Join Date: Dec 2011
Location: Florence SC
Age: 33
Posts: 29
Feedback: 0 reviews

37's mtr kevlars with 5:13 6speed on 3.5 lift 15mpg and love it. 1st gear I only use offroad now though.
Jbsmith44 is offline  
post #14 of 143 Old 12-18-2011, 08:03 PM Thread Starter
JKO Addict!
 
rdlynch2's Avatar
 
Join Date: Jul 2011
Location: Albany NY
Age: 34
Posts: 3,175
Feedback: 1 reviews

Quote:
Originally Posted by Jbsmith44 View Post
37's mtr kevlars with 5:13 6speed on 3.5 lift 15mpg and love it. 1st gear I only use offroad now though.
1st gear sucks anyways. Haha. Except in 4lo

2008 Black 2Dr 6spd D30/44
RK 2.5 X-Factor | Synergy tie rod | 35x12.5 MTRK's | BFH front | Genright rear | Yukon 5.13's | ARB front locker | Warn M8000 w/MasterPull synthetic | Rigid 10'' E-series
rdlynch2 is offline  
post #15 of 143 Old 12-18-2011, 08:13 PM
Wheeler
 
Jbsmith44's Avatar
 
Join Date: Dec 2011
Location: Florence SC
Age: 33
Posts: 29
Feedback: 0 reviews

Quote:
Originally Posted by rdlynch2 View Post
1st gear sucks anyways. Haha. Except in 4lo
Looks like we are on the same page then LOL
Jbsmith44 is offline  
post #16 of 143 Old 04-18-2012, 10:21 PM
Rock God
 
rballman's Avatar
 
Join Date: Feb 2010
Location: Durango, CO
Age: 37
Posts: 575
Feedback: 3 reviews

I know, old thread but hell I am in the same boat! Got a 2dr 6 speed too and need to decide between 4.88s and 5.13s...eventually moving to 37s too. I originally wanted 5.13s but now am thinking about going with 4.88s because the teeth are bigger and stronger? Is this right? Thoughts on the teeth side of things?

And yes I have seen the chart...more interested in the teeth question.

Thanks.

2007 Wrangler X - Jeep Green, 4" lift, 4.88s, locked rear, custom bumper/fender/cage, rolling on 35s w/ 15s
rballman is offline  
post #17 of 143 Old 04-18-2012, 10:28 PM
The Wheelin Man's Friend
 
RiverCityOffroad's Avatar
 
Join Date: Aug 2010
Location: Austin, TX
Posts: 8,649
Garage
Feedback: 60 reviews

I wouldn't run 5.13s on any smaller tire than a 37 with the 6 speed. First gear is extremely short with the 5.13s and you have to really work the clutch to get it rolling in 2nd on 37s. I do anyway.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
RiverCityOffroad is offline  
post #18 of 143 Old 04-19-2012, 03:01 AM
Rock God
 
toymaster's Avatar
 
Join Date: Feb 2011
Location: Clark, Wyoming
Age: 47
Posts: 1,152
Garage
Feedback: 2 reviews

Quote:
Originally Posted by rballman View Post
I know, old thread but hell I am in the same boat! Got a 2dr 6 speed too and need to decide between 4.88s and 5.13s...eventually moving to 37s too.
Its all about your altitude.

I have 35" 6 sd 5.13s In the Rockies 5,000ft. and above I say go 5.13s. If you are mostly at sea level 5.13s are too short. This winter I spent months at the AZ/Mexico border and have to say I started out in 2nd then went to 4th then 6th gear often.

In the rockies it is a whole different story I have to start off in 1st most of the time or give it a lot of fuel to not go dead.

Quote:
Originally Posted by virtual_mage View Post
.....a dark forum, were people would sometimes be rude but yet be helpful.
JK 2dr rubi
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
toymaster is offline  
post #19 of 143 Old 04-19-2012, 04:58 AM Thread Starter
JKO Addict!
 
rdlynch2's Avatar
 
Join Date: Jul 2011
Location: Albany NY
Age: 34
Posts: 3,175
Feedback: 1 reviews

So engaging first gear with this ratio takes longer or takes less time? And instead of starting out in second couldnt you just immediately shift from first to second gear once its engaged?

The difference btw 5.13 and 4.88 is pretty small as is so with both ratios first gear would be pretty short

2008 Black 2Dr 6spd D30/44
RK 2.5 X-Factor | Synergy tie rod | 35x12.5 MTRK's | BFH front | Genright rear | Yukon 5.13's | ARB front locker | Warn M8000 w/MasterPull synthetic | Rigid 10'' E-series

Last edited by rdlynch2; 04-19-2012 at 05:01 AM.
rdlynch2 is offline  
post #20 of 143 Old 04-19-2012, 05:01 AM
JKO Addict!
 
Goodysgotacuda's Avatar
 
Join Date: May 2009
Location: Denton, TX
Posts: 13,230
Feedback: 1 reviews

Quote:
Originally Posted by rdlynch2 View Post
So engaging first gear with this ratio takes longer or takes less time? And instead of starting out in second couldnt you just immediately shift to second gear once its engaged?
1st is very short, takes very little time to wind through first. And yes you can immediately shift, however...that gets pretty old.

SOLD - '09 2dr Rubicon - 1.0Gal | 6spd | 37s | 4.88s |
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
| OR-Fab cage | Poly Cage | BFH Front | XRC Rear | XRC12 Winch | Walker Evans Beadlocks |

Retired from the Jeep community, for now.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Goodysgotacuda is offline  
post #21 of 143 Old 04-19-2012, 05:02 AM
JKO Addict!
 
thedirtman's Avatar
 
Join Date: Aug 2010
Location: southwest reno, nv
Age: 51
Posts: 4,273
Feedback: 0 reviews

You will rev up faster in 1st and will need to shift a bit sooner that is it. Those gears are pretty close (4.88 vs 5.13) If you run the mountains 5.13 would be a better choice to hold speed on steep grades. If you run a lot of highway speeds on flat ground then 4.88 would be a better choice for a bit better mpg and a little bit quieter ride from fewer rpms at speed.
thedirtman is offline  
post #22 of 143 Old 04-19-2012, 05:05 AM Thread Starter
JKO Addict!
 
rdlynch2's Avatar
 
Join Date: Jul 2011
Location: Albany NY
Age: 34
Posts: 3,175
Feedback: 1 reviews

Are the lower gears harder on the stock clutch?

2008 Black 2Dr 6spd D30/44
RK 2.5 X-Factor | Synergy tie rod | 35x12.5 MTRK's | BFH front | Genright rear | Yukon 5.13's | ARB front locker | Warn M8000 w/MasterPull synthetic | Rigid 10'' E-series
rdlynch2 is offline  
post #23 of 143 Old 04-19-2012, 05:06 AM
JKO Addict!
 
thedirtman's Avatar
 
Join Date: Aug 2010
Location: southwest reno, nv
Age: 51
Posts: 4,273
Feedback: 0 reviews

Should make it easier on the clutch, driveshafts, and engine.
thedirtman is offline  
post #24 of 143 Old 04-19-2012, 05:06 AM Thread Starter
JKO Addict!
 
rdlynch2's Avatar
 
Join Date: Jul 2011
Location: Albany NY
Age: 34
Posts: 3,175
Feedback: 1 reviews

Quote:
Originally Posted by thedirtman View Post
You will rev up faster in 1st and will need to shift a bit sooner that is it. Those gears are pretty close (4.88 vs 5.13) If you run the mountains 5.13 would be a better choice to hold speed on steep grades. If you run a lot of highway speeds on flat ground then 4.88 would be a better choice for a bit better mpg and a little bit quieter ride from fewer rpms at speed.
Either way, im getting 5.13s installed this weekend and I have a 6 speed on 35s so I will be able to let you know how it is very soon!
Reddogracing likes this.

2008 Black 2Dr 6spd D30/44
RK 2.5 X-Factor | Synergy tie rod | 35x12.5 MTRK's | BFH front | Genright rear | Yukon 5.13's | ARB front locker | Warn M8000 w/MasterPull synthetic | Rigid 10'' E-series
rdlynch2 is offline  
post #25 of 143 Old 04-19-2012, 05:10 AM
JKO Addict!
 
thedirtman's Avatar
 
Join Date: Aug 2010
Location: southwest reno, nv
Age: 51
Posts: 4,273
Feedback: 0 reviews

I hope you are planning on bigger tires, you will be spinning some pretty good rpms at highway speed.
thedirtman is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the JKowners.com : Jeep Wrangler JK 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:
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:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



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
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome