2 part 742 Question re Ratio & Suregrip

Hi Folks,

So I was looking at my rearend today (my car's not my fat a$$) and have a couple questions that I am hoping FABO could help with.

727 TF/manual valvebody
742
Open Diff
28" tires

1. The PO said he thought the ratio was 3:23. But while driving the car it seems like the RPMs are high when cruising. Tachs not connected so I am going purely on gut/experience. I jacked it up, marked the drive shaft and tire. Getting a hair short of 1 full driveshaft revolution for every 4 tire rotations. Would that indicate something more in the line of a 3:92 ish ratio?

2. Being and open spool, traction is non-existent when hitting it in first. And breaks loose when shifting into 2nd if I wind it up. That said, short of picking up a second chunk (suregrip equipped) what is involved it setting up the chunk with a Sure-grip or aftermarket limited slip/posi? Also (guess it is really now a 3 part question :dontknow:) is this something the average shade tree mechanic can do, i.e. bolt on some parts and go, or would one suggest gettiing "professional" help. I am fairly handy with the wrenches, but know one can screw up a diff if not done correctly.

Sorry for the laundry list of questions guys & girls. I'm heading back into the garage to sort out my butchered wiring...another story LOL. Look forward to your advise, suggestions and tips.

Pat

And Happy St Pat's Day.