Originally Posted by cudacarl

i'm about to change the differential oil in the front and rear. My durango is a 2002 R/T 4x4 equipped with Anti spin differential & trailer tow group. i have a service manual for the durango and it states

A multi-purpose, hypoid gear lubricant which conforms
to the following specifications should be used.
Mopar Hypoid Gear Lubricant conforms to all of
these specifications.

FRONT AXLE

⊃2;

The lubricant should have MIL-L-2105C and
API GL 5 quality specifications.


⊃2;

Lubricant is a thermally stable SAE 80W-90
gear lubricant.


REAR AXLE

⊃2;

The lubricant should have MIL-L-2105C and
API GL 5 quality specifications.


⊃2;

8 1/4 lubricant is a thermally stable SAE
80W-90 gear lubricant.


⊃2;

9 1/4 lubricant is a thermally stable SAE
75W-90 gear lubricant.


NOTE: Trac-lokâ„¢ equipped axles require a friction

modifier be added to the lubricant.

my question is, would the rear be a 9 1/4 which uses a different weight ?

also will i need the friction modifier ?

if so i'm thinking only in the rear not the front.

thanks

Originally Posted by cudacarl

rear is 10 bolt. 8 1/4

what i really need to know is how to find out if i have trac-lok or not and if it did would it only be in the rear?

i have the window sticker and the only reference is
Axle - Anti-Spin Differential

Originally Posted by shrpshtr325

you got that backwards old_school, if they spin the same direction then you have a limited slip, if the wheels spin in opposite directions then its an open differential


also the front differential was ALWAYS an open unit, there was no limited slip or locker offered for the front

Originally Posted by cudacarl

ok so i don't need the friction modifier in the front. but if i jack the back up and it moves in the same direction like my posi trac 73' cuda then it has the trac lok in wich case i need the friction modifier correct ?