YJ Regear - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > YJ Jeep Wrangler Forum > YJ Tech Forum

Join Wrangler Forum Today


Like Tree3Likes
  • 1 Post By Got it at last
  • 2 Post By agalloch07
Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 05-15-2019, 11:58 AM
Thread Starter
  #1
Newb
 
Join Date: Nov 2017
Posts: 9
YJ Regear

I have a 1992 wrangler with a 4.0. I’m running 33” tires on it and thinking about a regear. I do about half daily driving and highway driving and the other half off roading. I want to use the Jeep to haul an atv and other camping gear but I also don’t want to gear so low that I’m at 3k rpm 5th gear down the freeway.

That being said, from those of you that have experience regearing a yj with similar specs, what would be the best gear ratio to give me reasonable highway performance, but still have plenty of torque to tow and do some low speed rock crawlin???

LucasForeman is offline   Quote
Old 05-15-2019, 12:14 PM   #2
IITYWTMWYBMAB

::WF Administrator::
 
4Jeepn's Avatar
 
Join Date: Apr 2005
Location: Florence, KY
Posts: 12,241
auto or stick? ball park 4.10-456.

__________________
79.96.85.00.01.97.00.97.93.97.95.94.15
CJ.XJ.CJ. TJ. TJ.ZJ. TJ.TJ. ZJ.ZJ.YJ. XJ. JK


JKU Build Inside: Party Girl
WranglerForum: Youtube Channel https://www.youtube.com/channel/UCHO...TLdAuMbTLs_bxw

JKUR 2" Rancho Sport - BlackForest Throwback Top - Milestar 315 Patagona Mt's - Outlaw Sheriff Rims - Bushwacker Flat Fenders -
Spicer Parts F/R Diff Covers, Front Drive Shaft - 4340 Alloy Shafts- Metal Cloak Overland Rock w/Flip Step -JCR Transmission Skid- Quadratec LED Headlights- Q9500i winch
4Jeepn is offline   Quote
Old 05-15-2019, 12:41 PM
Thread Starter
  #3
Newb
 
Join Date: Nov 2017
Posts: 9
Guess I shoulda mentioned that. 5 spd stick
LucasForeman is offline   Quote
Sponsored Links
Advertisement
 
Old 05-15-2019, 12:55 PM   #4
Jeeper
 
Join Date: Jul 2016
Posts: 1,037
What is your highway cruising speed? Plug your specs into the grimmjeeper calculator and you’ll have an idea of RPM at certain speeds given your gear ratio/tire size.

Either 4.55 or 4.88 will be most appropriate given your Parameters.
Blort is offline   Quote
Old 05-15-2019, 02:56 PM   #5
Jeeper
 
Jarhead Al's Avatar
 
Join Date: Jun 2017
Location: Central Florida
Posts: 797
Jarhead Al is offline   Quote
Old 05-15-2019, 03:26 PM   #6
Supporting Member

5-Year WF Supporting Member
 
Got it at last's Avatar
 
Join Date: Nov 2016
Location: Phoenix, Az
Posts: 1,560
I have 4.10's on mine, bought it with 33'S and just didn't have enough juice to run down the freeway without really pushing it, traded down to 31's and zip along at 75 even on slight grades. I wouldn't go 4.10 with 33's,
Sahara805 likes this.
__________________
'89 YJ 4.2 with MC-2150 Carb & HEI, 2-1/2" Magnaflow Exhaust. BA-10, NP231, Adams front Diveshaft, SYE kit, 31x 10.5 x15 BFG KO's, 2 1/2" Rancho Spring kit, 1" Body Lift. RS5000x shocks, No emissions.

FSM Manuals https://www.dropbox.com/sh/0vfmk6jc5...v7lceZk7a?dl=0
Got it at last is offline   Quote
Old 05-15-2019, 03:49 PM   #7
Jeeper
 
Join Date: Apr 2017
Location: VTA
Posts: 310
I went 4.10 with 33s and wish i did 4.56. I often run freeways at 70-75 MPH and still wish i had 4.56. My decision was made for me because i found an 8.8 with 4.10s in it already.
__________________
1988 YJ Sahara 4.2L 5spd,8.8/D30 w/4.10s, 33/10.5/15KO2s, TONS of tunes,Warn 5k winch, Body Armor rear bumper/tire rack. Spicer SYE, Procomp 4" lift kit,
Sahara805 is offline   Quote
Old 05-15-2019, 04:12 PM   #8
Jeeper
 
agalloch07's Avatar
 
Join Date: Aug 2016
Posts: 3,411
I had 4.10's and 33's and it worked for me but i am a flat lander with no hills. If i lived in a hilly area i would go 4.56
__________________
94, 4.0/NV4500/NP231HD w/JB Conversions super short SYE, 4.5" Rubicon Express lift, JKS 1.25" body lift, Dana 489's w/OX lockers 4.88 gears, Tom Woods drveshafts, 35" BFG KM3's, WFO boomerang shackles, Warn XD9000 winch, Doug Thorley header, JBA mid pipe, Borla cat back.
agalloch07 is online now   Quote
Old 05-15-2019, 04:54 PM   #9
Supporting Member

5-Year WF Supporting Member
 
Got it at last's Avatar
 
Join Date: Nov 2016
Location: Phoenix, Az
Posts: 1,560
Quote:
Originally Posted by agalloch07 View Post
I had 4.10's and 33's and it worked for me but i am a flat lander with no hills. If i lived in a hilly area i would go 4.56
Curious, Was that on your 94 with a 4.0? OP has a 4.2. I had tons of low end on mine, but at the top it was a task to tow 2 ski-doos on a trailer with the 33's. Do you think the 4.0 made the difference?
__________________
'89 YJ 4.2 with MC-2150 Carb & HEI, 2-1/2" Magnaflow Exhaust. BA-10, NP231, Adams front Diveshaft, SYE kit, 31x 10.5 x15 BFG KO's, 2 1/2" Rancho Spring kit, 1" Body Lift. RS5000x shocks, No emissions.

FSM Manuals https://www.dropbox.com/sh/0vfmk6jc5...v7lceZk7a?dl=0
Got it at last is offline   Quote
Old 05-15-2019, 04:55 PM
Thread Starter
  #10
Newb
 
Join Date: Nov 2017
Posts: 9
My ideal highway cruising speed is around 70-75. Anyone know from experience what I can expect my rpm to be if I go with 4.54 at this speed?

I plugged everything into the calculator linked above but I would rather judge it by someone with experience running 4.54 on 33s
LucasForeman is offline   Quote
Old 05-15-2019, 05:07 PM   #11
Supporting Member

5-Year WF Supporting Member
 
Got it at last's Avatar
 
Join Date: Nov 2016
Location: Phoenix, Az
Posts: 1,560
The calculator is pure math. It Is what it Says, the issue is how tired your motor may be to get and sustain said RPM.
__________________
'89 YJ 4.2 with MC-2150 Carb & HEI, 2-1/2" Magnaflow Exhaust. BA-10, NP231, Adams front Diveshaft, SYE kit, 31x 10.5 x15 BFG KO's, 2 1/2" Rancho Spring kit, 1" Body Lift. RS5000x shocks, No emissions.

FSM Manuals https://www.dropbox.com/sh/0vfmk6jc5...v7lceZk7a?dl=0
Got it at last is offline   Quote
Old 05-15-2019, 06:48 PM   #12
Jeeper
 
agalloch07's Avatar
 
Join Date: Aug 2016
Posts: 3,411
Quote:
Originally Posted by Got it at last View Post
Curious, Was that on your 94 with a 4.0? OP has a 4.2. I had tons of low end on mine, but at the top it was a task to tow 2 ski-doos on a trailer with the 33's. Do you think the 4.0 made the difference?

Yeah the 4.0 makes pretty good power on top end compared to the 258. My 4.0 has very good power compared to others i have owned and friends 4.0's for some reason. It has full exhaust and a big bore throttle body but nothing internal has been done.

When i went to 35's i was wanting to go 5.13 gears but i was worried about the RMP's screaming on the highway so i played it safe and went 4.88 and I'm happy with it. At 65mph I'm turning about 2,400 rpm and still have decent power for a flying brick. I would not want to pull a trailer though.
banjotx and Got it at last like this.
__________________
94, 4.0/NV4500/NP231HD w/JB Conversions super short SYE, 4.5" Rubicon Express lift, JKS 1.25" body lift, Dana 489's w/OX lockers 4.88 gears, Tom Woods drveshafts, 35" BFG KM3's, WFO boomerang shackles, Warn XD9000 winch, Doug Thorley header, JBA mid pipe, Borla cat back.
agalloch07 is online now   Quote
Old 05-15-2019, 09:21 PM   #13
Jeeper
 
spoof145's Avatar
 
Join Date: Aug 2016
Location: Copper
Posts: 44
Do you ever plan on going with 35s? For a 5 speed with 33" tires you want 4.56. If you had a 3sp auto you would want 4.10.
__________________
90 YJ, 4.2, 3sp Auto. 3.5" of lift. Dana 30 with elocker with an 8.8 track lok with 4.10s, 33x12.5x15 KM2s.
spoof145 is offline   Quote
Old 05-16-2019, 01:55 AM
Thread Starter
  #14
Newb
 
Join Date: Nov 2017
Posts: 9
Prolly gonna go with the 4.56. Seems to be the popular opinion. Thanks all for the input
LucasForeman is offline   Quote
Old 05-19-2019, 08:54 AM   #15
Jeeper
 
Join Date: Aug 2017
Posts: 118
Look at the gear charts. You can compare your current 4th gear rpm and power to which ever gear ratio.

I've got 33" and will probably go with 4.10. Nothing wrong with down shifting to pass or pull a bigger hill. You simply waste more gas with 4.56 for the benefit of having more power on the throttle. If you plan on towing often then you may need the 4.56.

Also note that the fuel injected 4.0 does have better power than the 4.2 or carb engines. Plus changing the single hole fuel injectors to 12 hole fuel injectors help pretty good at low rpm high loads.
ryker is offline   Quote
Old 05-19-2019, 09:10 AM   #16
Jeeper
 
Join Date: Aug 2017
Posts: 118
Quote:
Originally Posted by LucasForeman View Post
My ideal highway cruising speed is around 70-75. Anyone know from experience what I can expect my rpm to be if I go with 4.54 at this speed?

I plugged everything into the calculator linked above but I would rather judge it by someone with experience running 4.54 on 33s
70mph 33's with 3.07 gear in 4th gear is 2188rpm.
66mph 33's with 4.10 gear in 5th gear is 2177rpm. 70mph is 2300rpm

4.10 downshift to 4th at 70mph is 2900rpm. Should be plenty of power for any hill or towing.


are you currently happy with 4th gear power? if you don't like current 4th gear power then you might not like 5th gear with 4.10 gearing.
__________________
95 4.0 5sp 2.5" OME lift with MORE 5/8 lift shackles on 33" BFG All-Terrain. 3.07 gears. Engine has K&N air filter, 12 hole fuel injectors, MSD wires, Accel Coil, 3-core alum rad. with high flow water-pump.
ryker is offline   Quote
Old 05-20-2019, 09:05 PM   #17
Jeeper
 
SoCalC101CJYJTJ's Avatar
 
Join Date: Oct 2018
Location: SoCal, Middle of Everywhere
Posts: 264
Quote:
Originally Posted by LucasForeman View Post
Prolly gonna go with the 4.56. Seems to be the popular opinion. Thanks all for the input
Good call. I would never do 4.10s on a 4.0/AX-15 equipped Jeep running a 33 tire, it simply is not enough gear to run it in the power band where it belongs.

On my keeper YJ I installed .56s with the Dana 44 swap, and even loaded to the gills on road trips it was geared near perfect with the 33s, and I drive hard.

I have since installed 35s and it is still geared ok, but I have another MJ 44 waiting in the wings so may do a swap, do .88s, and use my current diffs. in the next build that I plan on running 33s on.

Not sure where you are in this fine country, but if you are in So Cal I have a number of 4.0/AX-15 YJs you are welcome to drive, in just about every tire/gear combo from 4.10/31 to 4.88/35 (including a couple of 4.56/33). Seeing is believing.
__________________
92 YJ, 4.0, AX15, Jeep Air, Mastercrafts, Bed Rug, Tuffy Tub Enclosure/Console/Hood Lock, Momo Prototipo, RE 4.5, Bilsteins, SYE, J.E. Reel Driveshaft, Dana 44/30, 4.56s, E-Locker, M.O.R.E. Steering Box Brace, Metalcloak Fenders/6 Flares, Fuel Anzas, BFG 35x12.50x15 AT2s, White Knuckle Rock Sliders, Garvin Bumpers/Spare Tire Mount, Tinted Bestop, Bestop Sliders, Warn 9.5ti, Old School KCs, Hella H4s, Quadratec LED tails.
SoCalC101CJYJTJ is offline   Quote
Old 05-20-2019, 09:09 PM   #18
bp1
Supporting Member

5-Year WF Supporting Member
 
bp1's Avatar
 
Join Date: Apr 2019
Posts: 364
Damn, you guy's have some really fast YJ's. I was able to get mine up to 68 couple days ago, but only when the highway curved to the north and then had a decent tail wind.
__________________
1992 Wrangler Sahara YJ
bp1 is offline   Quote
Old 05-21-2019, 12:24 AM   #19
Jeeper
 
Join Date: Dec 2014
Location: Earth
Posts: 679
4.56



However, a stock YJ has low tow capacity and low gross weight numbers. Weight from lift, tires and gear should be deleted from the YJ tow/haul numbers. YJ's through 1994 have terrible stock brakes. Not good for towing. Are you sure you want to tow?
wcjeep is offline   Quote
Old 05-21-2019, 02:42 AM   #20
Jeeper
 
spoof145's Avatar
 
Join Date: Aug 2016
Location: Copper
Posts: 44
My 90 with 4.2, 33s 4.10 gears will get up to 70 but she's screaming at those rpms. Sounds like she's about to blow.
__________________
90 YJ, 4.2, 3sp Auto. 3.5" of lift. Dana 30 with elocker with an 8.8 track lok with 4.10s, 33x12.5x15 KM2s.
spoof145 is offline   Quote
Old 05-21-2019, 09:30 AM   #21
Jeeper
 
Join Date: Apr 2017
Location: VTA
Posts: 310
^ Auto = apples and oranges
__________________
1988 YJ Sahara 4.2L 5spd,8.8/D30 w/4.10s, 33/10.5/15KO2s, TONS of tunes,Warn 5k winch, Body Armor rear bumper/tire rack. Spicer SYE, Procomp 4" lift kit,
Sahara805 is offline   Quote
Old 05-21-2019, 11:14 AM   #22
bp1
Supporting Member

5-Year WF Supporting Member
 
bp1's Avatar
 
Join Date: Apr 2019
Posts: 364
Quote:
Originally Posted by spoof145 View Post
My 90 with 4.2, 33s 4.10 gears will get up to 70 but she's screaming at those rpms. Sounds like she's about to blow.
It is really strange driving with the pedal slammed to the floor, reminds me of the go cart track when I a kid. No matter how hard you press you just can't quite catch that little bastard in front of you!
__________________
1992 Wrangler Sahara YJ
bp1 is offline   Quote
Old 05-21-2019, 02:10 PM   #23
Jeeper
 
mudbug85603's Avatar
 
Join Date: Nov 2016
Location: Upstate SC
Posts: 1,243
Put your stock specs into this calculator Gear Ratio Calculator then add your desired tire size and gear ratio see which ratio will bring it back to stock specs. Then don't forget to change the speedo drive gear so your speedo is accurate https://www.quadratec.com/c/referenc...ar-tooth-chart

__________________


'98 TJ 5sp Super 35 D30 w/Aussie 5.13 on 33's
'94 YJ 5sp 4.88 D35/HP30 sitting on 33's
mudbug85603 is offline   Quote
Reply

Thread Tools

Posting Rules
You may not post new threads
You may not 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 Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
To regear or not regear that is the question sallysky JK General Discussion Forum 9 02-02-2016 05:18 PM
To regear or not to regear that is the question retiredMarine TJ Tech Forum 20 06-24-2015 10:45 PM
Regear or not regear ... That is the question TheTNWrangler YJ Tech Forum 17 01-29-2013 09:39 PM
regear and locker or just regear brandon217 TJ General Discussion Forum 17 03-18-2012 10:50 PM
To regear or not to regear??? Timberman TJ General Discussion Forum 24 11-07-2008 09:29 AM





All times are GMT -5. The time now is 12:15 PM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.1
User Alert System provided by Advanced User Tagging v3.1.0 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.

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