commuter - RPM's too high. Gonna swap in 2.93's

[2MCHPWR]

Hi - I just bought the car but i do over 150 miles per day, all higway at approx 75 mph and 3500 RPM's is too high.
I'd like to do the 2.93 swap I read in the stickies.
That should drop RPM's to 3000 RPM.

Have any of you guys done this swap but retained the M44? Just curious how much it'll reduce normal accelleration on an already slow car

I don't think my car has LSD (as per window build sheet) but I haven't confirmed it hasn't been swapped out by a previous owner. I guess i'll have to jack up the rear and turn the wheels to confirm.

Am I on the right track by looking at these diffs? Should be a bolt in installation (re-use stock output flanges and half shafts) but will need to use E30 diff cover I think.

http://hudsonvalley.craigslist.org/pts/4529756513.html

http://www.ebay.com/itm/BMW-e28-diff...1fc741&vxp=mtr

http://www.ebay.com/itm/BMW-E30-E28-...195089&vxp=mtr