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I remember hearing that the formula s came with a 7 1/4 sure grip,and if you broke it under warranty they would replace it with an 8 3/4. I would check to see if it has a sure grip,they are very rare,and some slant six guys want them to upgrade their 7 1/4's. Or if you are only doing a mild...

Nothing below a 4.11.

Your speedo is off. Did you change the gear in the trans to match your tire size/gear ratio? With a 255/70/15 and a 3.23 you are around 78-69 MPH at 2600 rpm and 120 at 4500 rpm. http://www.kabamus.com/garage/gears.html

Could go with 28" or 29" tires. 28 will be worth about 2mph at a given rpm and a few more for 29's.

Check this out http://www.kabamus.com/garage/gears.html Looks like you will be around 2600 for 60 mph. You could always get a taller tire for longer trips to bring the rpm down some.

No,you should also do it in a modern car. It will save the synchros and clutch. My 87 D100 will downshift without revmatching every time,but I still do it.

I forget the specs,but yes the synchromesh is only one weight. If you buy from advanced auto,buy it online and check "pick up at store" then use code ES123,it will save you 10 bux when you buy 4. Comes out to 20.76 plus tax,and you can pick it up at the store after an hour. Also,to save your...

There you go,just so you dont feel left out:D

Same here,not a penzoil fan but really dig the syncromesh!

I have also heard GL-5 can cause premature bearing failure when used in applications that call for GL-4.

Yep,thats what I have always heard/read.

From what I have read the GL5 rated oil has additives that do not play nice with Brass syncro parts. Though some new Gl-4/Gl-5's are being formulated with special additives that would make them compatible in any application.

You mean GL-4,GL-5 is for rear diffs.

Yep synchros going out/worn. How is the fluid? Change the fluid,and try double clutching when downshifting and rev matching.

You will need this http://www.summitracing.com/parts/HUU-3320001/