I did the same thing but did not realize until the diff was drained. It was the only car at the shop so I had to use the 80-90 we had. That was 10k miles ago no problems so far but I will def go back to 75-140 the next time I open the diff... If you are not "forced" like me I would use the 75-140trinity_gt said:BTW, the shop manual states that the rear requires 75W140 but stupidly, before checking, I ended up buying 80W90 gear oil. Can I use this or do I need to go to the 75W140 instead?
yes it is a must. the stock ford trac-lock uses clutches.Newbie143 said:is a friection modifier a MUST???
and do STOCK mustangs already come with a friection modifier in stock gears ??????
96STANGVERT said:I am ready to purchase Ford racing 3.73 gear set which includes pinion nut and shims. Other than a speedcal, and gear lube, is there anything else i might need? The car is a 96 GT convertible 5spd with 47,000 miles.
GT JAY said:If you're only doing a gear swap, and not replacing the carrier, you don't need to add friction modifier again.
But like someone said if you go with a better gear lube, like Royal Purple it already has the friction modifier added to it.
SilverGTV8 said:Anytime you change the fluid you need to add the friction modifer. Unless you go with a fluid that already contains it, such as Royal Purple.
I don't under stand why you would say you don't need to do it if you are just doing a gear swap
So yes, you need to get the friction modifier when you change your gears unless you get an oil that already contains it.
SilverGTV8 said:You are the first person I have heard that says you don't need it.
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?