Axle fluid

[1969CoronetR/T]

I want to change the fluid in my axle and am not sure what to use. It is 8-3/4 as far as I can tell,
Thanks,
Mark

 

[A383Wing]

90w is what manual states

 

[1969CoronetR/T]

I quess it does not need a friction modifier?
Mark

 

[wannadrag]

80/90 with a little bottle of suregrip/posi additive if it has a suregrip

 

[1969CoronetR/T]

I put 75/90 in, but does it need the additive as it has sure grip?
Mark

 

[A383Wing]

if it's a sure grip, then yes, additive is needed..otherwise you will get chatter from the clutches

 

[1969CoronetR/T]

Thanks for the help again guys,
Mark