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cone 
AMC Addicted 
Joined: Apr/17/2010 Location: pennslyvania Status: Offline Points: 568 |
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 Topic: trac-locPosted: Feb/15/2019 at 5:33pm |
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What type of gear oil should be used with the trac-loc differential? I guess it's called twin grip too. Thanks
Edited by cone - Feb/15/2019 at 5:35pm |
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1987 J20, 87 Grand Wagoneer,70AMX,
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Buzzman72
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Posted: Feb/15/2019 at 6:44pm |
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One that includes a friction modifier.
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Buzzman72...void where prohibited, your mileage may vary, objects in mirror may be closer than they appear, and alcohol may intensify any side effects.
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tufcj
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Supporter of TheAMCForum Joined: Jul/10/2007 Location: Watkins, CO Status: Offline Points: 4088 |
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Posted: Feb/15/2019 at 8:23pm |
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Twin-grip was AMCs trade name for their traction control diff. They used 2 types of units. Early (up until about 1971) was the Power-Lock. Those had a 2 piece case and 4 spider gears and were more dependable and longer lived units. After that they used the Track-Lock, which had a 1 piece case and 2 spider gears. They weren't as tough and wore out faster. As far as lube, read the bottle. Most 80W90 lubes on the shelf are compatible with clutch type diffs. If you want the extra peace-of-mind, you can add a friction modifier. I use one available from Ford with good success. About $8 for an 8oz bottle at the dealer. 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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FSJunkie
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Posted: Feb/15/2019 at 9:09pm |
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In my experience the gear oils that say they are compatible with limited slip still cause the clutches to grab too much. I find they all need a bottle of friction additive.
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1955 Packard
1966 Marlin 1972 Wagoneer 1973 Ambassador 1977 Hornet 1982 Concord D/L 1984 Eagle Limited |
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PROSTOCKTOM
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Posted: Feb/15/2019 at 10:30pm |
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I've never seen a 8 ounce bottle from Ford. All the ones I ever used were 4 ounces and that is all you really need for a rearend. I too would not run a clutch type posi without it regardless of what the gear oil bottle says. Here's a link for it on eBay for $7.92 with free shipping. This probably about as cheap as you'll find it anywhere. http://www.ebay.com/itm/Ford-Motorcraft-OEM-XL3-Friction-Modifier-Additive-Limited-Slip-Differentials/263893670680?epid=1930509890&hash=item3d7149db18:g:zMAAAOSwuMRbfYJz:rk:1:pf:1&frcectupt=true
Tom
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wheelz
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Posted: Feb/19/2019 at 5:08pm |
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Only problem I had with gear oil was using Royal Purple in a posi which started slipping very quickly. The bottle says no friction modifiers needed..... I replaced with Valvoline dino and the modifier and no problems aftrerwards
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NCSteve
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Posted: Feb/20/2019 at 12:38pm |
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Not to hijack this thread, but with a twin grip, should you be able to rotate the wheels individually with them off the ground like an open diff? Or are they that tight that you cant? With mine jack up, it acts like a spool. (haven't opened it up yet to see what it actually has). Thanks
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1970 Big Bad orange AMX, 390 4speed, Go Pac
1979 Jeep Cherokee, 360, 4 speed/D20 2015 JKU Rubicon Tank Green |
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wheelz
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Posted: Feb/20/2019 at 1:26pm |
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With the rear tires off the ground and in neutral or shaft removed. A non-posi diff tires will spin in opposite directions when one is turned. A tight posi will spin both tires in the same direction and feel locked. A worn out posi will be noticbly loose but tires will still spin in same direction
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NCSteve
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Posted: Feb/22/2019 at 9:53am |
That is what I thought, but still learning and confirming on the AMC car stuff. I will pull my cover to see what is actually in there. Thanks
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1970 Big Bad orange AMX, 390 4speed, Go Pac
1979 Jeep Cherokee, 360, 4 speed/D20 2015 JKU Rubicon Tank Green |
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FSJunkie
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Posted: Feb/23/2019 at 12:58am |
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Dana used to publish a service check procedure for the 4-pinion Powr-lock and 2-pinion Trac-lock units.
I believe it was jack up one wheel, transmission in neutral, and turn the wheel that was jacked up off the ground. New units were supposed to take around 200 foot-pounds to turn, but performance was considered satisfactory down as low as 75 foot-pounds. Basically you shouldn't be able to turn the wheel with your bare hands. |
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1955 Packard
1966 Marlin 1972 Wagoneer 1973 Ambassador 1977 Hornet 1982 Concord D/L 1984 Eagle Limited |
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wheelz wrote: