Valvoline durablend ok for rear gears?

[94Blue302GT]

My manual states that i need GL-5 with an additive.
The valvoline Durablend says: "Recommended for all hypoid differentials (conventional and limited slip) and manual transmissions in pass....."
Do i still need an additive?
Here's their site:
http://www.valvoline.com/pages/products/product_detail.asp?product=2
I already own like 6 or 7 bottles of the stuff, so it'd be nice to use it, but do i need the additve or no?

 

[HISSIN50]

I am using Durablend in my rear end and it seems fine.

Here is my take if in doubt at adding friction modifier. If in doubt as to whether it is needed right now, leave it out. You can add it later. But if the fluid has it in it already (which I dont know. I added FM to the fluid), you cant remove the FM.

FWIW, the modifier makes the clutches slip (some folks seem to think it makes them bite harder, which is wrong). My take is: if in doubt leave it out (till you see how it does or find out what Valvoline recommends).

MHO.

Good luck.

 

[94Blue302GT]

hmmm, i don't like the trial and error method..
anyone else try it?
I was going to purchase some synthetic, but like i said, i already have a bunch of this stuff. I bought extra for playing with my explorer (cai, elec. fan, brown wire mod, air dam, worse gas mileage than stang...)

 

[HISSIN50]

You dont need to play trial and error - you can call their tech line and ask (or email them). I only suggested not using the FM (for now) if you had already torn in there and were not going to be able to contact them or hear a reply by the time the rear end up buttoned up. Easier to add FM later on, than to have the clutches slip and need to dump all the fluid and start over.

This is much better than seeing is someone else tried it - just because someone did something does not mean it's right.

FWIW, this stuff pours about like a conventional fluid IMHO. A true synthetic is much viscous - that would be what I want if trying to improve milage in an Explorer.

Good luck.