FOUND THE CASTING NUMBER ON MY 8 3/4 CAN I TELL WHAT GEAR RATIO / SUREGRIP?

[kevs1969daytona]

Found the casting number on my 8 3/4 when it was pulled for my Daytona restoration it's 2881489. Can I tell the gear ratio and if it's a sure grip ?

Thanks

[JB400]

Gear ratio will be id'd by a little metal tag bolted to center section.

[Ryan.C]

The tags are not always present
I count the turns to be sure. 

[green69rt]

All that casting number tells you is that this is a "489" case.  Gear ratio is usually on a tag attached to one of the cover bolts.  Nothing will tell if it is a SG, you have to look inside.

[1970 D100]

Turn one drum on one side. If the other side turns in the same direction it's a Sure Grip. If it turns in the opposite direction it is not.

[cdr]

Turn one drum on one side. If the other side turns in the same direction it's a Sure Grip. If it turns in the opposite direction it is not.

Not if its a S Trac or a True Trac

[1970 D100]

You're probably right, but I think they are lockers. In that case you could probably jam one side and turn the other. If it turns it's open, or busted, LOL. In my days of scrap yard hunting, I've had good luck with the method above. ... Eric.