gear lube

[thevic24]

i have a 9" with a detroit trac-lock. if iuse royal purple will i still need the limited slip additive? the 3-rd member is new and i need to change the fluid for break-in.
thanks-vic

[CTX-SLPR]

I think Royal Purple has the hypoid lube in it, read the side of the bottle. Remember it is something you can have too much of.

[thevic24]

you can have too much? should i use the purple or regular fluid and just add the additive?

[CTX-SLPR]

Too much posi lube will cause the clutchs to do something bad. Look at the bottle, it should say. Regular and the additive is a garentee but I'd check.

[thevic24]

thanks. i guess that trac-lock and limited-slip are the same?

[CTX-SLPR]

Is it clutched or gear drive? If its a clutch or cone style, you need the lube. Gear drives.... don't know.

[Freiburger]

A Trac Lock is a clutch-style limited-slip and does need friction modifier (I don't think "hypoid" is the answer here...that's for the r&p...all automotive gear lube is hypoid gear lube...correct me if I'm wrong).

A Detroit Truetrac is a gear style and should not require friction modifier.

Detroit is not the manufacturer of the Trac Lock...so which do you really have?

[CTX-SLPR]

I just recall that line from my '64 service manual, not sure if hypoid is right either. However yeah, you need the modifier for clutch or cone limited slips.

[Freiburger]

FYI:

http://www.eaton.com/EatonCom/ProductsServices/PerformanceProducts/Products/Differentials/index.htm

[thevic24]

the original was a traclock, this one is made by detroit and is a locking type. it was made for me and installed while i was out of town. if it dosnt need the modifyer will it hurt to have it any ways thanks

[thevic24]

hey i just found the papor work. sorry iam polish. it is a detriot locker and dose not need any modifyer.
(actually my whife found it) thanks for your help guys. 8) the track-lock was the factory style