What Rear fluid

[1BAD96SVT]

Im looking into changing my rear end fluid to royal purple on my cobra,how many quarts to i need and what weight should i go with..?

 

[Lightning Struck]

2 quarts of 75w90 is what went in mine if I remember correctly :dunno:

 

[riored96gt]

When I swapped to Royal Purple in February, it took just over 2 qts...
Don't forget the Ford traction Modifier!! $5 at a dealer

 

[Maniak87]

When I swapped to Royal Purple in February, it took just over 2 qts...
Don't forget the Ford traction Modifier!! $5 at a dealer

is the modifier needed? i am assuming yes... what weight royal purple did u go with?

 

[97blackgt]

i went with redline 75-90

and yeah you need the friction modifier

 

[riored96gt]

Yup...75-90.

No need for 85-140 unless you're road racing.

Without the modifier, the trac-loc won't, consistantly.

(I could do without the smell, though!)

 

[1FastGT]

what does the friction modifier do? sorry im a noob never knew this existed.

 

[MeanGrn Gt]

friction modifier is needed for the trac loc (limited slip) in the read end. without it the clutches wont function properly and you will be doing utofcloset: one wheel peels

 

[Conechaser]

Yup...75-90.

No need for 85-140 unless you're road racing.

Without the modifier, the trac-loc won't, consistantly.

(I could do without the smell, though!)

What happens if you use the 75-90 for the road course instead of the 85-140?

 

[birel21y]

If you use the thinner oil, its just not as much protectionon the ring and pinion. Your full throttle alot of the time, and the ring and pinion are turning crazy fast. More heat = thinner of oil, to compansate, use a thicker oil to start.

Same reason why we use 15-40 oil for the engine.