GTVAPSAMTIK

I am looking at buying a new differential cover to replace my stock cover when I change the oil. American muscle have two but I am not sure which one will fit my stock Rear Differentials. Here are the links. All it says is one is 7.5 and other is 8.8 I am not sure which one I need to order. And why are these two covers for $29, why are they cheaper compare to others?

http://www.americanmuscle.com/mustan...gridle-75.html

and

http://www.americanmuscle.com/mustan...eargridle.html

lizzyfan

the 8.8

GTVAPSAMTIK

Thanks I just ordered 8.8 . I am still wondering why its only for $30 while rest of em are for over 100 buck.

StriderTacticaL

Because what you ordered it basically nothing more than a chome version of your stock cover. The ones "over 100 bucks" are girdles which include two load bolts which screw against your differential's bearing ring caps, providing more support. They also feature separate drain and refill plugs which make future oil changes so much easier. Girdles also slightly increase your rear-end's oil capacity.

They look like this:

lizzyfan

Yep^
The one you are lookin' at is cosmetic, really can't see it anyway

GTVAPSAMTIK

now this got my thinking, I really like the idea of being able to change the oil without take off the whole cover. After how long Rear differental oil should be changed? Maybe I can cancel my order tomorrow and spend $130 for better cover.

lizzyfan

I would personally
Gives you ease in changing oil and serves a function (more support)

lizzyfan

This is the one I have http://cgi.ebay.com/ebaymotors/TA-PE...Q5fCarQ5fParts
All aftermarket units are decent

GTVAPSAMTIK

After how long the differential oil needs to be changed. My decision is gonna depend on thats. If it needs to be changed after a long duration ill go with cheap one, if needs changing after like 10k miles ill get something like yours. This is what I am going to put in along with Championk SLP additive.

tbirdscwd

This is what i got http://cgi.ebay.com/ebaymotors/Ford-...item3a58804691. I did the best offer thing and got it for $81. It looks like the GMS which doesn't have the best track record for quality, but I can't see how bad you could screw up a girdle. There's really nothing there to fail!