2000 Mustang Base &.5 rear end Friction Modifier?

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05-08-2011, 08:26 PM

dotey90

Thread Starter

Join Date: Apr 2011

Location: Virginia

Posts: 1

2000 Mustang Base &.5 rear end Friction Modifier?

Hey guys I've got a 2000 Mustang and I'm going to replace the rear differential cover gasket i know that i will need some 80w-90 i will probably use the Valvoline brand but regardless i need to know do i need to add friction modifier in to the mix? some places i go say yes and some say no i would really appreciate an answer so i can get my car back on the road its the last thing i have to do thanks any help is appreciated.

05-09-2011, 06:25 AM

Timspony

SVT Section Moderator

Join Date: Jul 2008

Location: Burnt Hills, NY

Posts: 15,601

Welcome to MF!

.... If you have a POSI rear, add the friction modifer!

05-09-2011, 09:32 AM

Alec

5th Gear Member

Join Date: Aug 2009

Location: Philadelphia, PA

Posts: 4,256

When I swapped out my 7.5 rear for the 8.8 I added Royal Purple which has friction modifier in it. Some people still said I needed to add the modifier but I haven't had any problems yet

Welcome to the site

05-09-2011, 04:02 PM

mustangman02232

6th Gear Member

Join Date: Dec 2004

Location: Ludlow, Mass

Posts: 15,864

welcome to the forums

05-10-2011, 07:45 AM

Fink

5th Gear Member

Join Date: Jan 2008

Location: Canada

Posts: 3,306

If you have the stock open diff, run 80w90 with no friction modifier.

If you have a limited slip or posi diff, run 75w140 with a bottle of friction modifier.