Mopar Sure-Grip Differentials for 8.25
04-17-2018, 03:02 PM
#1
Seasoned Member
Thread Starter
Mopar Sure-Grip Differentials for 8.25
So I was "window shopping" and came across this Mopar Performance Sure-Grip differential for the Chrysler 8.25 on Summit.
I Google searched and didn't come up with much for XJs, except for this one thread here on CF.
Here's a quote from that thread:
If I am understanding this correctly, this is Mopar's factory limited slip differential for the 8.25. It seems to be a decent price at just under $400.
Does anybody know anything about these? Would this be something worth considering for an XJ?
I Google searched and didn't come up with much for XJs, except for this one thread here on CF.
Here's a quote from that thread:
It's limited slip. I ran them during the muscle car era. They are tough and are one of the quicker responding lsd. This may help the OP.
Sure Grip
"Sure Grip" is the Chrysler name for a limited slip differential. It was optional on the 8-3/4" axles, 1958-1974.
Two styles were used.
1958-1969 used the Dana Power-Lock Pt# 2881487). This unit utilized clutches for the differential locking action. The Power-Lock can be rebuilt using kit # 2070845 ( Mopar Performance PT # P4529484 ). In this assembly, axle drive shaft end thrust is taken by the thrust block assembly (replacement # 2881313). This Sure Grip appeared in the 741 and 742 assemblies. The axle bearings are: 25590 Timken cone, and 25520 cup, Chrysler numbers 1790523 and 696403).
The Dana Power-Lock can be recognized by its bolt-together assembly, bolts around the side opposite the ring gear, and multiple openings exposing the cross shafts.
1969-1974 used the Borg Warner Spin Resistant (# 2881343). This unit utilized a spring-preloaded cone friction arrangement for the locking action. Axle end thrust is taken by the cross shaft.
This Sure Grip appeared in 489 assemblies and 70 and later 741/742 assemblies.<br>
The differential axle bearings are:LM 104912 (Timken cone), and LM 104949 (Timken cup), (Chrysler numbers 2852729 and 2852728).
The Borg Warner Spin Resistant unit can be recognized by its lack of bolts on the side opposite the ring gear (like the Dana), and two openings exposing the preload springs.
Borg Warner sold this design to Auburn Gear who currently offers the replacement Sure Grip assemblies.
Non-Sure Grip differentials can be identified by the large openings in the differential exposing the differential (aka. spider) gears. There are no springs or clutches.
The two Sure Grip types can be interchanged between the carriers if the matching differential axle bearings are retained. The outside diameter of the cups are the same between the 741/742 and the 489, the inner cone differs.
The Sure Grip differential can be used as a direct replacement for the non-Sure Grip within the carrier/bearing limits previously noted.
Sure Grip
"Sure Grip" is the Chrysler name for a limited slip differential. It was optional on the 8-3/4" axles, 1958-1974.
Two styles were used.
1958-1969 used the Dana Power-Lock Pt# 2881487). This unit utilized clutches for the differential locking action. The Power-Lock can be rebuilt using kit # 2070845 ( Mopar Performance PT # P4529484 ). In this assembly, axle drive shaft end thrust is taken by the thrust block assembly (replacement # 2881313). This Sure Grip appeared in the 741 and 742 assemblies. The axle bearings are: 25590 Timken cone, and 25520 cup, Chrysler numbers 1790523 and 696403).
The Dana Power-Lock can be recognized by its bolt-together assembly, bolts around the side opposite the ring gear, and multiple openings exposing the cross shafts.
1969-1974 used the Borg Warner Spin Resistant (# 2881343). This unit utilized a spring-preloaded cone friction arrangement for the locking action. Axle end thrust is taken by the cross shaft.
This Sure Grip appeared in 489 assemblies and 70 and later 741/742 assemblies.<br>
The differential axle bearings are:LM 104912 (Timken cone), and LM 104949 (Timken cup), (Chrysler numbers 2852729 and 2852728).
The Borg Warner Spin Resistant unit can be recognized by its lack of bolts on the side opposite the ring gear (like the Dana), and two openings exposing the preload springs.
Borg Warner sold this design to Auburn Gear who currently offers the replacement Sure Grip assemblies.
Non-Sure Grip differentials can be identified by the large openings in the differential exposing the differential (aka. spider) gears. There are no springs or clutches.
The two Sure Grip types can be interchanged between the carriers if the matching differential axle bearings are retained. The outside diameter of the cups are the same between the 741/742 and the 489, the inner cone differs.
The Sure Grip differential can be used as a direct replacement for the non-Sure Grip within the carrier/bearing limits previously noted.
Does anybody know anything about these? Would this be something worth considering for an XJ?
04-21-2018, 09:44 PM
#6
Seasoned Member
Thread Starter
Trending Topics
04-22-2018, 07:02 PM
#8
Seasoned Member
Thread Starter
04-22-2018, 07:30 PM
#9
CF Veteran
If you run heavier weight gear oil you won't have any popping, I have a Spartan in the rear of the Jeep and a Detroit locker in the rear of my truck and both are quiet. If you want a limited slip to install with gears then I recommend a Detroit Truetrac, they use worm gears to transfer torque instead of clutches so they don't wear out and they work better than a clutch type limited slip.
04-22-2018, 07:35 PM
#10
Seasoned Member
Thread Starter
If you run heavier weight gear oil you won't have any popping, I have a Spartan in the rear of the Jeep and a Detroit locker in the rear of my truck and both are quiet. If you want a limited slip to install with gears then I recommend a Detroit Truetrac, they use worm gears to transfer torque instead of clutches so they don't wear out and they work better than a clutch type limited slip.
04-23-2018, 01:43 AM
#12
CF Veteran
Join Date: Feb 2011
Location: Henderson, NV
Posts: 1,944
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1999
Engine: 4.0L
04-23-2018, 06:11 AM
#13
CF Veteran
04-23-2018, 09:07 AM
#14
Seasoned Member
Thread Starter
I don't want an open diff on the street, like 00t444e said. I originally wanted a selectable, but I've discovered with my truck that I like a limited-slip in the rear for driving in winter conditions.
I was searching online and came across this Mopar Sure-Grip and thought maybe I had discovered something cool... But maybe not.
I was searching online and came across this Mopar Sure-Grip and thought maybe I had discovered something cool... But maybe not.
05-03-2018, 09:56 AM
#15
Newbie
Join Date: May 2017
Posts: 8
Likes: 0
Received 0 Likes
on
0 Posts
Model: Cherokee
For whatever it's worth, 4 Wheel Parts has the Detroit True Trac. Depending on the differential, the cost varies by a couple of hundred. For my XJ they quoted about $1100 installed. My Jeep is mostly a daily driver, and I'm seriously considering it. They also have the True Trac for the front differential; I haven't priced that yet.
Thread
Thread Starter
Forum
Replies
Last Post
mattmurphync
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
5
11-21-2010 10:23 AM
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)