Glad you got one.
You can DEFINITELY feel the diff in weight b/t the steel and Al driveshafts. The less rotational weight the better.
Yeah and next time you need to do some mechanic work, just go to an old large parking lot in the back and do what you need to do there.
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351W-powered 1979 Ford Mustang notchback
Stock 5.8L under custom made 4" cowl, C4 w/ shift kit
Holley 750 cfm, Edelbrock Performer RPM intake
1 5/8" MAC shorty headers, Al driveshaft
2.5" Off road H-pipe, 2-chamber Flowmasters
Front: 225/60/15, Rear: 255/60/15 Eagle GT II
Weld wheels (15x6;15x8), 8.8" Rear w/ 3.55s
14 x 4” K&N air filter.
Only a couple of weeks b4 Project FOX begins!!! 
"Red, thou art my companion. Hasten now your quickened metamorphosis to Green that I may conquer all who dare abide there beside me. May they be left thither behind burnt black." ---Fox Body