Notices
Modified JK Tech Tech related bulletin board forum regarding subjects such as suspension, tires & wheels, steering, bumpers, skid plates, drive train, cages, on-board air and other useful modifications that will help improve the performance and protection of your Jeep JK Wrangler (Rubicon, Sahara, Unlimited and X) on the trail.

PLEASE DO NOT START SHOW & TELL TYPE THREADS IN THIS FORUM

35's with 3.73 gears

Thread Tools
 
Old Feb 6, 2008 | 12:40 PM
  #21  
cousin eddy's Avatar
JK Enthusiast
 
Joined: Dec 2007
Posts: 130
Likes: 0
From: Flagstaff AZ
Default

I have a 2008 X with 35's and 3.73 gears,I drive about 100+ miles each day and it doesn't really suck.I also find that when I am off-road I tend to use low range more than I should,but it goes everywhere I point it.My mileage is crap at 13-14 mpg but I don't care too much about that.I just got a price to install 5.13 gears and it was $1427.00 not bad,so they are going in next week.
Reply
Old Feb 6, 2008 | 05:02 PM
  #22  
Engine553's Avatar
JK Enthusiast
 
Joined: Dec 2007
Posts: 104
Likes: 0
From: East Hampton, NY
Default

Originally Posted by cousin eddy
I have a 2008 X with 35's and 3.73 gears,I drive about 100+ miles each day and it doesn't really suck.I also find that when I am off-road I tend to use low range more than I should,but it goes everywhere I point it.My mileage is crap at 13-14 mpg but I don't care too much about that.I just got a price to install 5.13 gears and it was $1427.00 not bad,so they are going in next week.
Ditto!

I have the OD off before I leave the driveway. 0-60 in 2 minutes! 5.13's are the cure. Hopefully in the next few weeks.
Reply
Old Feb 6, 2008 | 05:17 PM
  #23  
cousin eddy's Avatar
JK Enthusiast
 
Joined: Dec 2007
Posts: 130
Likes: 0
From: Flagstaff AZ
Default

Yeah! no O.D.
Reply
Old Feb 6, 2008 | 05:52 PM
  #24  
Engine553's Avatar
JK Enthusiast
 
Joined: Dec 2007
Posts: 104
Likes: 0
From: East Hampton, NY
Default

Originally Posted by cousin eddy
Yeah! no O.D.
I hate the gearing even at stock with the 3.73's it was a pig taking off at a light.
Reply
Old Feb 6, 2008 | 06:08 PM
  #25  
wayland1985's Avatar
JK Junkie
 
Joined: Jul 2007
Posts: 3,193
Likes: 2
From: Boston, MA
Default

Originally Posted by Engine553
I hate the gearing even at stock with the 3.73's it was a pig taking off at a light.
So you had the 35's with 3.73s?
Reply
Old Feb 6, 2008 | 10:51 PM
  #26  
TEEJ's Avatar
JK Super Freak
 
Joined: Sep 2007
Posts: 1,623
Likes: 5
From: Lawrenceville, NJ
Talking

Damn - you guys should get sports cars instead of trucks or something.

I have the stock 32's on a 4 dr X with the 6 spd....5th is 1:1, 6th is OD...and the diffs are 3.73's.

Going from 32's to 35's is only a 8.6% change in effective gearing.

I think I cruise at about 2k rpm at 60 mph with the 32's in 6th.

With 35's, that would drop my rpm's by about 8.6%, or from ~ 2,000, to about 1,830 rpm.

That means I'd be spending an awful lot of money to get back a measly ~ 172 rpm.

If I got 37's, that's a 13.5% drop in rpms....say from 2,000 rpm down to 1,730 rpm...a 270 rpm drop.

I think IIRC, going from 5th to 6th drops the rpm about 400-500...so a 270 rpm drop means I didn't even drop enough to down shift to compensate.

So, for any given speed, my rpms are somewhere between 8-13.5% lower if I go from 32's to 35's or 37's...call it a quarter to a a half shift drop.

Did you realize tht driving at 2,000 rpm in 5th at 60 mph feels like driving at 2,000 rpm in 6th at 60 mph?



IE: If you have to down shift a bit earlier in hilly terrain, its merely to get into the stock power band anyway...its not like it hurts anything.

The engine is going the same rpm, and you're going the same speed...how much is it worth it to you to get back 172 rpm?

If $ is no object, sure, get the lowest crawl ratio you can...lower gears are guaranteed power boosters...screw OPEC.

On a leased rig, there's NO WAY I'd re-gear for that little bit of difference....Hell, If I needed that much more go go juice, I'd have bought something faster to start with.

With 3.21's, sheesh, for $50 you could have checked off the 3.73 box....ouch.



For rocks...I LOVE lower gears. On the hwy - I think of larger tires as a deeper overdrive....speeding, honey, look at the speedometer, I'm only going 65! (Or maybe 13.5% faster than the speedometer says I am, and 13.5% further than the odometer says, etc...)



So - Hw many miles does the lease cover?
Reply
Old Feb 7, 2008 | 02:23 AM
  #27  
wayland1985's Avatar
JK Junkie
 
Joined: Jul 2007
Posts: 3,193
Likes: 2
From: Boston, MA
Default

Originally Posted by TEEJ
With 3.21's, sheesh, for $50 you could have checked off the 3.73 box....ouch.
:
Yeah... but some of us bought ours fresh off the lot... No checkboxes
Reply
Old Feb 7, 2008 | 01:56 PM
  #28  
wwarner20's Avatar
Thread Starter
JK Newbie
 
Joined: Jan 2008
Posts: 9
Likes: 0
From: Sarasota, Florida
Default

Originally Posted by TEEJ
Damn - you guys should get sports cars instead of trucks or something.

I have the stock 32's on a 4 dr X with the 6 spd....5th is 1:1, 6th is OD...and the diffs are 3.73's.

Going from 32's to 35's is only a 8.6% change in effective gearing.

I think I cruise at about 2k rpm at 60 mph with the 32's in 6th.

With 35's, that would drop my rpm's by about 8.6%, or from ~ 2,000, to about 1,830 rpm.

That means I'd be spending an awful lot of money to get back a measly ~ 172 rpm.

If I got 37's, that's a 13.5% drop in rpms....say from 2,000 rpm down to 1,730 rpm...a 270 rpm drop.

I think IIRC, going from 5th to 6th drops the rpm about 400-500...so a 270 rpm drop means I didn't even drop enough to down shift to compensate.

So, for any given speed, my rpms are somewhere between 8-13.5% lower if I go from 32's to 35's or 37's...call it a quarter to a a half shift drop.

Did you realize tht driving at 2,000 rpm in 5th at 60 mph feels like driving at 2,000 rpm in 6th at 60 mph?



IE: If you have to down shift a bit earlier in hilly terrain, its merely to get into the stock power band anyway...its not like it hurts anything.

The engine is going the same rpm, and you're going the same speed...how much is it worth it to you to get back 172 rpm?

If $ is no object, sure, get the lowest crawl ratio you can...lower gears are guaranteed power boosters...screw OPEC.

On a leased rig, there's NO WAY I'd re-gear for that little bit of difference....Hell, If I needed that much more go go juice, I'd have bought something faster to start with.

With 3.21's, sheesh, for $50 you could have checked off the 3.73 box....ouch.



For rocks...I LOVE lower gears. On the hwy - I think of larger tires as a deeper overdrive....speeding, honey, look at the speedometer, I'm only going 65! (Or maybe 13.5% faster than the speedometer says I am, and 13.5% further than the odometer says, etc...)



So - Hw many miles does the lease cover?
My lease covers 15,000 miles per year. I have a three year lease. I guess I should have mentioned that I opted for the lease because I am going to college in Florida and plan on moving to So Cal or Oregon after school. I leased a two wheel drive for Florida, no hills no snow cant find any mud. I plan on a 4x4 once my lease is up. Plus the two wheel drive was cheaper. I guess i should just drive this one the way it is and deck out the 4x4 and do some wheelin. I lived in Prescott AZ and Newport and Klamath Falls OR. The wheelin there was amazing. Florida sucks for wheelin IMO. Thank you all for the feedback and advice. By the way having a 2x4 JK is allot more fun than not having a JK at all.
Reply
Old Feb 7, 2008 | 02:15 PM
  #29  
Matmalmik's Avatar
JK Newbie
 
Joined: Jan 2008
Posts: 74
Likes: 0
From: Wilmington,De
Default

I have a 2 dr X with 35's..my question is this...i want 4.88's but is that all i need?? or am i going to have to change the carrier cases? im doing it myself with the help of a wrenching buddy..
Reply
Old Feb 7, 2008 | 06:42 PM
  #30  
The Diesel's Avatar
JK Enthusiast
 
Joined: Aug 2007
Posts: 209
Likes: 0
From: Alief, TX
Default

Called the dealer and they said i have a d44 rear and d30 front with 3.21s. I was sure mine had at least 3.73s cause it will scratch the tires pretty damn hard in second.
Reply



All times are GMT -8. The time now is 05:20 PM.