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Twin Grip okay for wheelin' |
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DAMX
AMC Apprentice Joined: Nov/13/2017 Location: Silicon Valley Status: Offline Points: 194 |
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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
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tufcj
Supporter of TheAMCForum Supporter of TheAMCForum Joined: Jul/10/2007 Location: Watkins, CO Status: Offline Points: 4064 |
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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
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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 |
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DAMX
AMC Apprentice Joined: Nov/13/2017 Location: Silicon Valley Status: Offline Points: 194 |
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Thanks Bob,
It has been confirmed that the carrier is the 2 piece 4 spider version. Thanks! Regards Dono
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jpnjim
AMC Addicted Joined: Nov/25/2007 Location: New England Status: Offline Points: 2752 |
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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.
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71 P-code 4spd Javelin/AMX
some Jeeps and some Fords |
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