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AMC 20 Twin Grip |
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david0141 
AMC Apprentice 
Joined: May/21/2018 Location: KC, MO. Status: Offline Points: 60 |
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 Topic: AMC 20 Twin GripPosted: Nov/10/2018 at 9:15pm |
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Is there special friction modifier additive that you should add to the gear lube after rebuild?
Thanks David
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Fluffy73
AMC Addicted 
Joined: Nov/21/2007 Location: Castlegar, BC Status: Offline Points: 3059 |
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Posted: Nov/10/2018 at 10:44pm |
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Depends on the gear oil you use. Some gear oil is specifically for limited slip applications and has some of said friction modifiers in it.
I've been told it doesn't hurt anything to add the little 3-ounce (or so) bottle of modifier as well. Used to be a Delco brand that was available at pretty much any decent auto parts store... |
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I am genetically incapable of being Politically Correct.
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david0141
AMC Apprentice
Joined: May/21/2018 Location: KC, MO. Status: Offline Points: 60 |
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Posted: Nov/11/2018 at 6:50am |
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Thanks Fluffy73.
I am restoring a 69 AMX. Replacing Bearings & Seals (not clutch pack). Bought 80-90 gear club & a small bottle of modifier at O'Reilly's just making sure it was correct. Thanks David |
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White70JavelinSST
Supporter of TheAMCForum 
Joined: Aug/08/2012 Location: Minnesota Status: Offline Points: 4867 |
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Posted: Nov/15/2018 at 12:15pm |
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In another post on this forum it was mentioned that one of the best additives for this application today is available at GM dealerships.
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70 Javelin SST, second owner, purchased 1972
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304-dude
AMC Addicted
Joined: Sep/29/2008 Location: Central Illinoi Status: Offline Points: 9082 |
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Posted: Nov/15/2018 at 12:26pm |
Also the Honda guys have been using GM additive in their manual trannys as well. Been a common knowledge with them before I stumbled upon the info on a Honda forum. Discovered it back when we got our Accord in 2011. |
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71 Javelin SST body
390 69 crank, 70 block & heads NASCAR SB2 rods & pistons 78 Jeep TH400 w/ 2.76 Low 50/50 Ford-AMC Suspension 79 F150 rear & 8.8 axles Ford Racing 3.25 gears & 9" /w Detroit locker |
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david0141
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Joined: May/21/2018 Location: KC, MO. Status: Offline Points: 60 |
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Posted: Nov/16/2018 at 7:13am |
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Thanks White70JavelinSST
Will stop by local GM store and pick up a couple bottles. |
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PHAT69AMX
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Joined: Jul/07/2007 Location: West Virginia Status: Offline Points: 5926 |
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Posted: Nov/16/2018 at 5:58pm |
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I got the Mopar 80W-90 Gear Oil # 04874468 (Quart) and Mopar Posi Additive # 04318060AB
from my friendly local Chrysler Jeep Dealership.
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ccowx
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Joined: Nov/03/2010 Location: Yukon Status: Offline Points: 3510 |
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Posted: Nov/16/2018 at 8:56pm |
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There are diff lubes that are already formulated for limited slip diffs. No additive required.
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amxron
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Joined: Nov/18/2011 Status: Offline Points: 295 |
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Posted: Nov/17/2018 at 10:22pm |
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Ford sells a good one too.
Ron. |
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AMXron
Fleet/Jeep Mgr. Orbit AMC/Jeep 50-1787 |
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White70JavelinSST wrote: