4.88 Gears, initial impressions. - Jeep Wrangler Forum
Jeep Wrangler Forum

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

Join Wrangler Forum Today


Like Tree4Likes
  • 2 Post By MudderNuker
  • 1 Post By Defcon 1
  • 1 Post By 283 YJ
Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 03-02-2019, 01:58 PM
Thread Starter
  #1
Jeeper
 
MudderNuker's Avatar
 
Join Date: Feb 2012
Posts: 174
4.88 Gears, initial impressions.

Picked up my YJ 2.5 a few days ago from the shop after getting 4.88 gears, front and back Truetracs and Ten Factory rear shafts. Initially I notice a strong harmonic vibration but since has been corrected after the pinion angle was corrected. Now I have minimal vibrations above 60 MPH.

Now as far as the gears, well, my slow output squirrels are happier now. Before the gears, I had enough power for city driving and highway driving with no wind. I had done the usual bolt-on power adders to the engine and they helped but now with the new gears you can notice the difference. It feels smoother and the power delivery is more linear as well as more effortless when compared. I can maintain 70 MPH on the highway in fifth gear without having to down shift on small inclines. I now have a reasonable amount of passing power.

My biggest regret is not doing it sooner. Well and the bill. Including the Detroit Truetracs, axle shafts, gears and labor, I spent around $2,600 (including new brakes front and back with new calipers and drums).

Is it worth it? I think so. I plan on keeping my YJ for a long time. The reason I went with Truetracs instead of lockers is because I don't rock crawl and I have a property in the New Mexico mountains were it snows a lot.

JMO69 and cabosh like this.
__________________
'92 YJ Malibu Yellow, 2.5 L, 5 Speed, 4.88 gears, 3.5 inch lift, 33" BFGs, F&R Truetracs, Ten Factory rear axles, 4 Hole Injectors, headers, intake and 4.0 TB.
MudderNuker is offline   Quote
Old 03-02-2019, 02:26 PM   #2
Jeeper
 
Defcon 1's Avatar
 
Join Date: Jun 2012
Location: South New Jersey
Posts: 1,193
Ahh man every 2.5l YJ owners dream, lower gears or bigger engine.

I have 32's with the 4.10's and it's "tolerable". I was thinking about re-gearing but I'm holding out for the V-8 swap down the road someday... (Have a 8.8 with 4.10's that's a part of my V8 power dream lol). I have V8/4.10's in my pickup and it's absolutely perfect all-round, I think I would die and go to Heaven if I can do the same in my YJ one day.

Congrats on the new gears hope it works out well for you! Keep that YJ forever it will be all worth it until you sell it!
MudderNuker likes this.

Defcon 1 is offline   Quote
Old 03-02-2019, 02:37 PM   #3
Jeeper
 
283 YJ's Avatar
 
Join Date: Aug 2017
Location: Central Oregon
Posts: 420
Thanks for the write-up. Helps.
MudderNuker likes this.
__________________
If I ever ask you if you want me to be honest with you, say no.
283 YJ is offline   Quote
Sponsored Links
Advertisement
 
Old 03-02-2019, 03:10 PM
Thread Starter
  #4
Jeeper
 
MudderNuker's Avatar
 
Join Date: Feb 2012
Posts: 174
Quote:
Originally Posted by Defcon 1 View Post
Ahh man every 2.5l YJ owners dream, lower gears or bigger engine.

I have 32's with the 4.10's and it's "tolerable". I was thinking about re-gearing but I'm holding out for the V-8 swap down the road someday... (Have a 8.8 with 4.10's that's a part of my V8 power dream lol). I have V8/4.10's in my pickup and it's absolutely perfect all-round, I think I would die and go to Heaven if I can do the same in my YJ one day.

Congrats on the new gears hope it works out well for you! Keep that YJ forever it will be all worth it until you sell it!
I hear you. A V8 is a proper motor. I've heard YJs with V8s and I get size envy. lol I'm actually quite satisfied with my YJ right now. Tomorrow I'm doing the steering gear box and lower steering shaft. That should tighten the dead spot I have and steering play. I also ordered the "The Cure" from RuffStuff which also helps.
__________________
'92 YJ Malibu Yellow, 2.5 L, 5 Speed, 4.88 gears, 3.5 inch lift, 33" BFGs, F&R Truetracs, Ten Factory rear axles, 4 Hole Injectors, headers, intake and 4.0 TB.
MudderNuker is offline   Quote
Old 03-02-2019, 03:11 PM
Thread Starter
  #5
Jeeper
 
MudderNuker's Avatar
 
Join Date: Feb 2012
Posts: 174
Quote:
Originally Posted by 283 YJ View Post
Thanks for the write-up. Helps.
I got Elite gears from Ron's Machining Service. They had gear/Truetrac combo packages that were cheaper than any other place I found.
__________________
'92 YJ Malibu Yellow, 2.5 L, 5 Speed, 4.88 gears, 3.5 inch lift, 33" BFGs, F&R Truetracs, Ten Factory rear axles, 4 Hole Injectors, headers, intake and 4.0 TB.
MudderNuker is offline   Quote
Old 03-04-2019, 08:14 PM   #6
Jeeper
 
JMO69's Avatar
 
Join Date: Apr 2014
Location: RI
Posts: 577
My set-up was just like yours, 2.5 4.88 gears 33s w/ true tracs front and back. It was great. But I couldn't leave well enough alone and did a 5.3 swap. Then I found out the 5.3 with the ax15 and 4.88 it was geared too low! First gear like a granny gear and winding out at 55mph on the highway. So I either had to re-gear AGAIN for $2000 to 4.10 or go with a larger tire. So any excuse for bigger tires I went with 35s along with new fenders and cutting to accommodate and my ratio is much better. Anyway, your set-up is good, I enjoyed it when I had it. I've gone through mucho dinero and a lot of headaches since then.
__________________
"NO! YOU CAN'T BORROW MY JEEP!" 91 YJ, 5.3 Vortec, AX15, Old Man EMU springs, one piece front passenger side axle shaft, 2.5"lift+1.5"BL,33"Tires,8.8axle,4.88 gears,SYE,Detroit TrueTrac locker, magnaflow muffler. https://www.wranglerforum.com/f330/b...y-1303009.html
JMO69 is offline   Quote
Old 03-05-2019, 09:04 AM
Thread Starter
  #7
Jeeper
 
MudderNuker's Avatar
 
Join Date: Feb 2012
Posts: 174
Quote:
Originally Posted by JMO69 View Post
My set-up was just like yours, 2.5 4.88 gears 33s w/ true tracs front and back. It was great. But I couldn't leave well enough alone and did a 5.3 swap. Then I found out the 5.3 with the ax15 and 4.88 it was geared too low! First gear like a granny gear and winding out at 55mph on the highway. So I either had to re-gear AGAIN for $2000 to 4.10 or go with a larger tire. So any excuse for bigger tires I went with 35s along with new fenders and cutting to accommodate and my ratio is much better. Anyway, your set-up is good, I enjoyed it when I had it. I've gone through mucho dinero and a lot of headaches since then.
It does get expensive to do re-gearing. I spent around $2,700 (gears, rear shafts, Truetracs) if you include the brakes. I have thought about 35" tires but that requires more money plus modifications since I only have a 3.5" lift. I believe I would require a bigger lift or body lift plus trimming.

I went to the Metal Cloak website the other day and I priced their fenders, corner guards and rocker panels and holy cow $2,500. They sure have great stuff but that's too much money to drop on my YJ right now. I still want to do the A/C before the summer here in Hell Paso starts. I barely drive the Wrangler in the summer due to the heat being unbearable.
__________________
'92 YJ Malibu Yellow, 2.5 L, 5 Speed, 4.88 gears, 3.5 inch lift, 33" BFGs, F&R Truetracs, Ten Factory rear axles, 4 Hole Injectors, headers, intake and 4.0 TB.
MudderNuker is offline   Quote
Old 04-09-2019, 10:24 AM   #8
Jeeper
 
wookiedave's Avatar
 
Join Date: Feb 2017
Posts: 75
So I need opinions on some axles that are available for me to purchase. I have 93 YJ 4.0 with a 5 speed and it has a spring over lift that was done incorrectly. I am going to go back to the spring under with a RE 4.5" lift and 1" shackles to accommodate the 35" tires that are on it now. The front and rear ends that are for sale have 4.88 gears in them. Will this set up be good for driving on the highway? I have read other threads on here and it's saying that the rpm's would be a little higher at 70 mph. I don't want to tear my Jeep up but it will be on the highway from time to time since I live in Atlanta.
wookiedave is offline   Quote
Old 04-09-2019, 04:56 PM   #9
Jeeper
 
Gottagofast's Avatar
 
Join Date: May 2017
Posts: 8,401
4.88 is perfect for 4.0 5 speed and 35's

The RE extreme duty springs already use 1" longer than stock....
Don't try to add any more shackle than that. Instead add a 1.25" body lift IF you need it
__________________
I come in peace.... I mean you no harm
Currently in the stable: ... 97 tj 4.0 5 speed stock....04 tj 4.0 auto 4" and 33's... 98 tj roller for future build... 94 yj sahara 4.5" RE and 33's... 92 yj sbc 3/4 ton axles and 38's... Cj5,7,yj,xj,ex mud dragster project

TJ dash speakers that actually rock! Kicker sub and amp in center console
Gottagofast is offline   Quote
Old 04-09-2019, 05:20 PM   #10
Jeeper
 
wookiedave's Avatar
 
Join Date: Feb 2017
Posts: 75
Awesome, thanks for the tip. I am going to look at the axles on Sunday.

wookiedave 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
Review: Alpine x209-WRA (Initial Impressions) Swadehead JK General Discussion Forum 178 03-24-2019 05:25 PM
4.88 gears on stock tires Jborkowicz623 JK Tech Forum 5 02-08-2015 08:12 PM
4.88 gears with 34 tires Zcam93 YJ General Discussion Forum 12 10-27-2014 05:52 PM
Will 4.88 gears HURT my gas mileage? kshaws21 TJ General Discussion Forum 44 06-30-2011 11:53 PM
4.88 gears Joey YJ Tech Forum 4 11-23-2008 10:45 AM





All times are GMT -5. The time now is 06:00 PM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2020, 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 © 2020 DragonByte Technologies Ltd.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.

Jeepģ, Wrangler, Liberty, Wagoneer, Cherokee, Gladiator, Mopar and Grand Cherokee are copyrighted and trademarked to FCA US LLC.
Wranglerforum.com is not in any way associated with FCA US LLC.