I have a 1977 XLT Custom (Australian). How can I be sure if it has a limited slip differential so I can determine the type of oil it needs?

 

Jack up one rear wheel and, with the trans in neutral, see if you can turn it.

 

Thanks for the reply: I just did that and yes, the wheel rolls in both directions, so that means....?

 

If both wheels are of the ground and while spinning one the other spins the other direction then it is an open rear end, non limited slip.

 

Same direction means limited slip. On another note, you can just use some 80-90 "GL5" which has friction modifier in it. Either way just use that type of oil

 

I can't say on australlian trucks, but the ones here have a LS on the tag on the diff. If the tag is gone then this is irrevelent

 

either way some limited slip additive wont hurt, its better for metal-on-metal action anyway. somethin like castrol 80-90 hypoid i believe is LS compatible anywho so just use that(read the bottle and be sure tho)

 

Thx you guys

 

If the AXLE code stamped on the Rating Plate (1959/60), Warranty Plate (1961/80), 1981 to date: Printed on the Certification Label begins with a letter: Limited Slip.

If with a number, no Limited Slip

 

This is a valuable piece of info, thanks ND. I found a few rear 9" and 60s in a scrap yard, some from late 70s fords some I don't know from what the older ones had a different tag and no room for a LS designation, but I found 3 verified LS rears and all had LS on the axle tag. Then I went and looked in my 79 ford service manual and it did say that limited slip axles do have a LS on the axle tag. Thanks that will help me in my everoing limited slip search.

 

1959/67 F100's, some 1968 F100's: If Limited Slip was ordered, Ford installed Dana 44's.

1959/63 Ford/Merc Passenger Cars with a 9" & Limited Slip have a separate tag on the pumpkin at approx. 4 o'clock that has the letter L on it.

Axle ID tag located at approx. 5 o'clock.

 

Lockers, Limited Slips and other Differentials Explained[IMG]linkscanner://unknown.gif/[/IMG]


<CITE>www.offroaders.com/tech/limited-slip-lockers-differentials.htm answered my ?</CITE>

 

If your from the land down under does that mean your wheels turn the opposite direction?

 

Yeah ours roll left over to right! You should see how the dunny flushes!