Yukon Dura Grip and 4.10's, initial impression - Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > JK Jeep Wrangler Forum > JK Tech Forum

Join Wrangler Forum Today

Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 05-27-2014, 03:46 PM   #1
Join Date: Nov 2013
Location: Chelan County, Washington
Posts: 430
Cascade Wanderer is on a distinguished road
Yukon Dura Grip and 4.10's, initial impression

Recently changed out my open diffs and 3.21's for a front selectable locker and the Yukon Dura Grip limited slip, along with 4.10 gears. I'll deal with the locker in a later report. Vehicle is a 2012 JK, 3.6, 6-speed manual, set up with 265/75/16 BFG All Terrain tires.

Up front let me state that I'm a long-time fan of limited slip differentials, on street or off-pavement rigs. I've had quite a number of them over the years, from nearly ineffective well-worn stock units to very aggressive aftermarket limited slip diffs. I know their handling quirks, and I like driving a limited slip equipped vehicle.

I liked the 3.21's, and the open diffs. The "BLD" function worked well for mild wheeling. It was actually very impressive, but I wanted stronger off-pavement capability.

Rockridge 4WD did the install, using synthetic gear lube and a limited slip additive.

The Yukon Dura Grip:

The gearing change was impressive. From a start there is no more slipping of the clutch to get going. Let the clutch out and the little JK leaps forward effortlessly. In town I find myself cruising around in 4th instead of 3rd. Out on the two-lane highway at 50 - 60 mph, I'm using 6th instead of 5th, and am turning 2300 rpm at 60 mph, roughly. The 3.6 is very comfortable at that rpm. Mixed in town and two-lane highway driving sees the Jeep averaging 16.5 mpg, up about 1.5 mpg from what I saw with the 3.21's.

I doubt I'll ever see those 22 - 23 mpg figures I used to see out on the open road, but for the mixed in town and up in the hills and out on the two-lane driving I generally do, the JK is actually getting somewhat better fuel economy.

Yukon's Dura Grip features four springs, pre-loading clutch packs. It's a very traditional limited slip design that appears to be very well built.

On pavement, in and out of town, it's barely perceptible. I know what a limited slip rear end feels like, and I did pick up on it right away. Occasionally pulling out into traffic there's a brief scuffing of the inside rear tire, just a chirp. On dirt, the rear of the Jeep stayed planted and I noticed no wheel spin, even going up a fairly steep, dry, slope with loose rocks and gravel over a hard surface. Normally I preferred going up that slope in four-low (with the stock 3.21's and open diffs) but now I go up it in two wheel drive, using first and second gears as necessary.

In 4-low, first gear, the JK idles along at a very slow pace now, slower than walking.

The gears and limited slip are new to my JK, and my initial impression of both the gears and the Yukon Dura Grip is very favorable!

Regards, Guy
Cascade Wanderer is offline   Quote
Old 06-02-2014, 11:05 PM   #2
lampatmyfeet's Avatar
Join Date: Jan 2014
Posts: 32
lampatmyfeet is on a distinguished road
Thanks for this write up. I am considering changing from my 3.73 gearing to the 4.10. Am a little disappointed with the responsiveness from my current set-up.

lampatmyfeet is offline   Quote
Old 06-03-2014, 05:26 AM   #3
gecko4's Avatar
Join Date: Aug 2013
Location: ontario
Posts: 916
gecko4 is on a distinguished road
Great write up and pics. What size tires are you running? Mine's in the shop this week for a regear to 4.10s with trutracs front and rear.
gecko4 is offline   Quote
Old 06-03-2014, 11:49 PM   #4
Join Date: Nov 2013
Location: Chelan County, Washington
Posts: 430
Cascade Wanderer is on a distinguished road
Thanks guys.

The 4.10's seem to be a real good match with the Pentastar & manual transmission. BTW, out on the highway my computer was reading 19.5 mpg yesterday, so maybe there's hope that the long-trip fuel economy won't be too bad...

I'm running 265/75 BFG A/T's on 16" rims. They're about 31" tall, about the actual size of most 32's. Might go to 285's (33's) late this summer or early in the fall.

If anyone gets the Dura Grip or a similar aggressive rear diff, be aware that it can induce some handling peculiarities, particularly on snow & ice.

Cascade Wanderer is offline   Quote

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

Download our Mobile App

» Featured Product

All times are GMT -5. The time now is 04:32 AM.

User Alert System provided by Advanced User Tagging v3.1.0 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 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
« Back

Enter your email address:

Delivered by FeedBurner