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Discussion Starter · #1 ·
The break-in instructions I received with 9" trac-loc are very specific about using Valvoline pt# 825 85W-140 gear lube.

Valvoline Canada tells me this particular lube is no longer avialable. Diff. guy told me don't use synthetc.

Any suggestions for gear lube.
 

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Dang! That is the exact stuff the builder told me to use on my new 9" detroit locker for break in.
 

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Since you are installing a traction lock (which has clutches), be sure that whatever type of fluid you substite has the friction modifier in it-most will tell you if they are good for posi's. Otherwise hop down to Ford and purchase a bottle. One bottle (kind of small) is all you will need for 1 installation.

Synthetic lube is not normally recommended for traction locks. IIRC, it has something to do with it being too slippery for the clutches to work properly.

_________________
Dennis

65' Stang

393 Stroker, Toploader 4 spd, 9" 3:70 rear.

Victor Jr. Knockoff Heads, 282S cam, Stealth Intake, Bigs Stage 5 750DP, Accufab Headers, Scattershield, Caltracs.



<font size=-1>[ This Message was edited by: dennis111 on 6/17/06 7:40pm ]</font>
 

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Discussion Starter · #5 ·
Oops

The 85W-140 is for circle track cars.

Actually supossed to use pt#831 80-90W
 

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FYI--My 2005 F150 Supercrew has sythetic fluid in the rear. 3.55 TracLok. I haven't changed to it, there is a metal tag on the rear stating that is sythetic.

Further, the additive [which works by the way to stop chatter, etc] makes the rear axle lube "slippery" to prevent the chatter of the clutches grabbing and releasing on turns.
 

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My 03 Mustang GT is the same way, as I found out when I tried to change it. No drain or fill plugs. I "love" low maintenance.
 
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