Also trying to decide on what posi to go with for a 600-650ish (bottlefed) HP H/C/I M6 car. 
Ford 9" Trac-Loc
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From: Fat Chance Hotel
Ford 9" Trac-Loc I hit the 500 mile mark on my new rear setup and needed to change the fluid. The auto parts store didn't have much of a selection and I ended up with Mobil 1 LS 75w90 because I wasn't paying $18/qt for Royal Purple and there was only two bottles of Lucas conventional gear lube left on the shelf.
I can't seem to find much consistent information about the Trac-Loc posi unit (here or on the ford sites) and whether synthetic fluid is ok. I managed to forget to add the friction modifier which I can add if necessary even though the Mobil 1 LS supposedly contains the FM. I can hear more noise during slow sharp turns which is fine with me, except if that causes excess wear.
Anyone have an expert opinion? Synthetic yes/no? Add the friction modifier too?
I can't seem to find much consistent information about the Trac-Loc posi unit (here or on the ford sites) and whether synthetic fluid is ok. I managed to forget to add the friction modifier which I can add if necessary even though the Mobil 1 LS supposedly contains the FM. I can hear more noise during slow sharp turns which is fine with me, except if that causes excess wear.
Anyone have an expert opinion? Synthetic yes/no? Add the friction modifier too?
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ATI ProCharger and Moser Sales 260 672-2076
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ATI ProCharger and Moser Sales 260 672-2076
PM's disabled, please e-mail me
E-mail: brutespeed@gmail.comob@brutespeed.com
https://brutespeed.com/ Link to website
Thread Starter
TECH Addict
Joined: Mar 2004
Posts: 2,336
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From: Fat Chance Hotel
Update:
I got a hold of Strange and they recommend conventional fluid with the additive for the break-in period, but afterwards they said synthetic is ok but definitely add the FM.
I got a hold of Strange and they recommend conventional fluid with the additive for the break-in period, but afterwards they said synthetic is ok but definitely add the FM.
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