Fox Look What I Found Under The Carpet

1200gt · Feb 26, 2017

I found this under the carpet, kinda feel like I found her Birth Certificate

I'm trying to find what friction modifier if any that I need to put in my Diff. Got the notion from the latest build thread by @mrobins26. He listed a chart with various diff codes that require certain friction modifier additives.

When I did my 5 lug conv. I just filled my diff with this: What should I do if I need to rectify anything?

Davedacarpainter · Feb 26, 2017

Cool find on your build sheet. Hopefully i'll find one on mine once i get it home and finish ripping out the interior.

You just need a friction modifier. Like this
Just suck out a little of the diff fluid and add this in, then top off with you diff fluid.

1200gt · Feb 26, 2017

Davedacarpainter said:
Cool find on your build sheet. Hopefully i'll find one on mine once i get it home and finish ripping out the interior.

You just need a friction modifier. Like this
Just suck out a little of the diff fluid and add this in, then top off with you diff fluid.

Thanks Dave. I just google it: Got a hit at Amazon free shipping for $8.50.

Yeah, I was quite surprised to see a build=sheet under the carpet. It looks as if it didn't get to much water on it over these WET South Florida years, but then the car was only on the streets for 3 years of its life.

There's a lot of info on that sheet though...

Mstng93SSP · Feb 26, 2017

You can also add the friction modifier through the vent cap on the top of the passengers side axle tube. It might be easier.

Chuckman · Feb 26, 2017

Most of normal name brand (Valvoline, Pennzoil, Mobil, etc) gear lubes these days (especially synthetics) have friction mod already in them, since it doesn't really hurt a non-lsd diff to have it, though the packaging will say if for use with limited slip or not. If it does already have it, I wouldn't put extra in.

Davedacarpainter · Feb 26, 2017

1200gt said:
Thanks Dave. I just google it: Got a hit at Amazon free shipping for $8.50.

Yeah, I was quite surprised to see a build=sheet under the carpet. It looks as if it didn't get to much water on it over these WET South Florida years, but then the car was only on the streets for 3 years of its life.

There's a lot of info on that sheet though...

Yeah, everything! I hope mine hasn't wasted away, but from the look of my floorboards, I think hoping might be pointless.

General karthief · Feb 26, 2017

Davedacarpainter said:
Yeah, everything! I hope mine hasn't wasted away, but from the look of my floorboards, I think hoping might be pointless.

The previous inhabitants were using it for a blanket for their nest but took it with them when they moved

1200gt · Feb 26, 2017

Mstng93SSP said:
You can also add the friction modifier through the vent cap on the top of the passengers side axle tube. It might be easier.

Great idea!

Funny, I just installed the completed Rear Diff last week, that has been sitting under my dining-room table for 2.5 years. I got it all assemble and didn't have any modifier on hand and hadn't research it either... I completely forgot about putting it in until, thankfully, I was reading the mentioned thread that jogged my memory.

When the stuff comes in the mail, I'll explore all the creative ways of sucking some oil out and installing the modifier. Thanks again for the tip.

1200gt · Feb 26, 2017

Chuckman said:
Most of normal name brand (Valvoline, Pennzoil, Mobil, etc) gear lubes these days (especially synthetics) have friction mod already in them, since it doesn't really hurt a non-lsd diff to have it, though the packaging will say if for use with limited slip or not. If it does already have it, I wouldn't put extra in.

Well, I just drain the old out, installed the Strange axles - new bearings etc, cleaned everything up, and refilled with the gear oil pic above.

I was just researching a minute ago and ran across an Old-Dogg that stated you shouldn't add modifier unless the diff chunk has been removed and parts-washed - just fill it and forget-it. Hmmm. I think I'm going to put some in unless someone with a whole lot of experience on here talks me down....

Thanks Friend for the info. BTW, I kinda wish now that I went with synthetic.....

1200gt · Feb 26, 2017

I've been researching all sorts of fun stuff from the info on this build-sheet!!!!

FoxChasis · Feb 26, 2017

I can decode a lot of the build sheets. But I need a complete VIN.

mrobins26 · Feb 26, 2017

1200gt said:
I found this under the carpet, kinda feel like I found her Birth Certificate

I'm trying to find what friction modifier if any that I need to put in my Diff. Got the notion from the latest build thread by @mrobins26. He listed a chart with various diff codes that require certain friction modifier additives.

When I did my 5 lug conv. I just filled my diff with this: What should I do if I need to rectify anything?

If you look at the sticker on the end of the driver side door for the Axle ID code...

And if it is a "M", "Z" or "R" then you need to add the friction modifier, or use a GL5 equivalent that specifically says for Limited Slip Diffs... You can probably look at the build sheet too.. that is awesome... M = 2.73:1 w/ trac lok, Z= 3.08 w/trac lok, and R = 3.45:1 w/ trac lok... 8, G, Y, F, B are not trac lok.

The one thing I could not resolve is that Ford recommends 80W90 GL5 for the mustang. But they recommend different weights for other vehicles with the same axle. Not sure it matters

Mstng93SSP · Feb 26, 2017

I don't think you will have to drain any gear oil to add the friction modifier. It's only a couple of ounces so it should not make any difference.

Chris

FoxChasis · Feb 27, 2017

mrobins26 said:
If you look at the sticker on the end of the driver side door for the Axle ID code...

And if it is a "M", "Z" or "R" then you need to add the friction modifier, or use a GL5 equivalent that specifically says for Limited Slip Diffs... You can probably look at the build sheet too.. that is awesome... M = 2.73:1 w/ trac lok, Z= 3.08 w/trac lok, and R = 3.45:1 w/ trac lok... 8, G, Y, F, B are not trac lok.

Door tag for this car has "M" axle code.

All 1982+ V8 Capris/Mustangs and all 1983+ 2.3T Capris/Mustangs have Traction-Lok as required/standard equipment.

Fox Look What I Found Under The Carpet

1200gt

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Davedacarpainter

Chicks can make things hard if they’re inspired...

1200gt

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Mstng93SSP

You have a nice rear end there Dave.

Chuckman

GTFO you fat, heavy bastard

Davedacarpainter

Chicks can make things hard if they’re inspired...

General karthief

wonder how much it would cost to ship you a pair

1200gt

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1200gt

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1200gt

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FoxChasis

mrobins26

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Mstng93SSP

You have a nice rear end there Dave.

FoxChasis

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Fox Look What I Found Under The Carpet

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Chicks can make things hard if they’re inspired...

Active Member

You have a nice rear end there Dave.

GTFO you fat, heavy bastard

Chicks can make things hard if they’re inspired...

wonder how much it would cost to ship you a pair

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Active Member

Active Member

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You have a nice rear end there Dave.

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