TheAMCForum.com Homepage
Forum Home Forum Home > The Garage > Transmission & Drivetrain > Eagle and Jeep Specific drive-train issues
  New Posts New Posts RSS Feed - Twin Grip okay for wheelin'
  FAQ FAQ  Forum Search   Events   Register Register  Login Login

Click for TheAMCForum Rules / Click for PDF version of Forum Rules
Your donations help keep this valuable resource free and growing. Thank you.

Twin Grip okay for wheelin'

 Post Reply Post Reply
Author
Message
DAMX View Drop Down
AMC Apprentice
AMC Apprentice
Avatar

Joined: Nov/13/2017
Location: Silicon Valley
Status: Offline
Points: 194
Post Options Post Options   Thanks (0) Thanks(0)   Quote DAMX Quote  Post ReplyReply Direct Link To This Post Topic: Twin Grip okay for wheelin'
    Posted: Nov/09/2021 at 3:13pm
Hello,

Is the Model 20 Twin Grip okay for climbing where the inside rear wheel gets really light, or will the clutches slip and burn up the differential if this is a common activity? Is this type of climbing locker territory? Thanks in advance!

Regards

Dono
Back to Top
tufcj View Drop Down
Supporter of TheAMCForum
Supporter of TheAMCForum
Avatar
Supporter of TheAMCForum

Joined: Jul/10/2007
Location: Watkins, CO
Status: Offline
Points: 4064
Post Options Post Options   Thanks (0) Thanks(0)   Quote tufcj Quote  Post ReplyReply Direct Link To This Post Posted: Nov/09/2021 at 4:50pm
There are 2 types of diffs sold under the "Twin Grip" name.   Up until about 1971, they used the Power Lock, which has a 2 piece case(bolted together) and 4 spiders.  These are about bullet proof.  After 1971, they used the Track-Lock, which has a 1 piece case and 2 spiders.  These aren't know for their longevity, usually pretty loose after 20-30K miles.

Bob
tufcj 
69 AMX
74 Javelin AMX
67 Rogue

If you need a tool and don't buy it...
you'll eventually pay for it...
and not have it.
Henry Ford
Back to Top
DAMX View Drop Down
AMC Apprentice
AMC Apprentice
Avatar

Joined: Nov/13/2017
Location: Silicon Valley
Status: Offline
Points: 194
Post Options Post Options   Thanks (0) Thanks(0)   Quote DAMX Quote  Post ReplyReply Direct Link To This Post Posted: Nov/13/2021 at 2:00am
Thanks Bob,

It has been confirmed that the carrier is the 2 piece 4 spider version. Thanks!

Regards

Dono
Back to Top
jpnjim View Drop Down
AMC Addicted
AMC Addicted
Avatar

Joined: Nov/25/2007
Location: New England
Status: Offline
Points: 2752
Post Options Post Options   Thanks (0) Thanks(0)   Quote jpnjim Quote  Post ReplyReply Direct Link To This Post Posted: Nov/13/2021 at 10:24am
I used a Power-Lok rear in my first real offroad Jeep.
 (2-piece case Twin Grips were Dana/Spicer Power-Loks)

 The rear was a Dana 60 from a Dodge drag car,
 so the Power Lok was set up pretty tight.

It was never at a loss for traction offroad,
but street manners were still great.

That Jeep got a spool next,
and then a full Detroit a couple years later.

 The tight Power-Lok probably had 80% of the traction of the other two,
 but didn't kill offroad turning radius like the Spool did,
 and didn't have any of the slams and bangs on the street like the Detroit did.

Worst thing about the PL was I was always worried I would eventually wear out the clutches and start to lose traction,
 but even after a couple years of daily driving & hitting trails every few weekends in the Summer,
 it held up fine.

There's a 2-piece case AMC 20 Twin Grip (Power-Lok) in my Javelin now that I set up with the tightest possible stack,

 I'm hoping it's street manners will be as good as what the Jeep had,
 time will tell since the car is still a work in progress.


BTW,
 you can re-arrange the clutch plates & disc stack in the 2-piece cases to make them very tight,
 or very loose,
 I had a copy of a D44 service manual that showed all the different stacks, and what their resulting grip would be.

If I recall correctly,
 the different auto manufacturers each spec'd out different stack configurations depending on how much grip vs slip they wanted for their brand of vehicles.
71 P-code 4spd Javelin/AMX
some Jeeps and some Fords
Back to Top
 Post Reply Post Reply
  Share Topic   

Forum Jump Forum Permissions View Drop Down

Forum Software by Web Wiz Forums® version 12.03
Copyright ©2001-2019 Web Wiz Ltd.

This page was generated in 0.172 seconds.
All content of this site Copyright © 2018 TheAMCForum unless otherwise noted, all rights reserved.
PROBLEMS LOGGING IN or REGISTERING:
If you have problems logging in or registering, then please contact a Moderator or