Just did my gears and was wondering what grade and brand gear oil everyone was using I put in Mobil 1 synthetic 75/90 of course with some friction modifier which is about half the price of the synthetic 75/140 specified in the manual
any thoughts?

 

I just went with synthetic. I had my 3.73's done about two weeks ago. No problems. What are your thoughts on the gears??????

 

I can't belive the difference in power thinking I am in the low 13's now

 

I cannot wait for mine. I am putting in FRPP 4.10's and they use royal purple I believe.

 

I just don't understand gears. I hear a lot about 4.10's and all that but what if you have an automatic car?

 

I used 75/140 Amsoil with friction modifier. Don't cut corners when it comes to lubricants, personal or otherwise!

 

Mustang Kid,

I think gears will even help out a automatic. Ford upgraded the stock gearing for the Hertz to put in 3.55's instead of the stock ones. I am guessing that a new torque converter and gears would do wonders to your auto.

 

amen!!

 

I'd be using Ford recommended synthetic 75/140 if I was living in Texas simply because of the extreme heat there.

 

lesson learned, I could hear the diff slipping as I drove around corners after the rear end got warm mabey 10 or 15 miles of driving. after I would let it sit long enough it would stop until it warmed back up.
Draining it now and going to go with Royal Purple 75/140. anyone else have to look around to find some gear oil it seems almost everyone was out of the 75/140 or only had one or two quarts

 

I have an automatic and the 3.73's made a very noticable difference. I can't imagine what 4.10's would feel like.

 

Simply amazing... they are the perfect ratio for the auto tranny,

 

Don't tell him that Don after he just put the other gears in!

 

How much do they cost and where could I get some? I am interested now!

 

But won't that degrade the latex?

 

Sometimes the truth hurts a little. lol

 

omg roflmao :LOL: