Wheight Savings For Power, Here is a list of Most of Them!
Every 100lbs Off = 1 tenth quicker et.
Lightweight wheels/tires: 40-60 lbs
Remove Swaybar (front/rear) 25 lbs
Aluminum driveshaft: 5 lbs
Bumper supports: 40 lbs
Rear seat: 15 lbs
Seat belts: 15 lbs
Aluminum flywheel: 15 lbs
A/C system: 50 lbs
Emissions components: 15 lbs
Sound Deadening: 90 lbs
Rear axle vibration damper: 5 lbs
power lock servos: 2 lbs
Lightweight brakes: 30 lbs
Aluminum control arms: 10 lbs
4cid front springs 7-10 lbs less than 5.0
Coil over front suspention 30 lbs
Plastic Fuel Cell 20lbs
Race seats: 40-60 lbs
Tubular K-member: 20-40 lbs
Power steering: 17 lbs
Manual brakes: 10 lbs
Extra wiring/dash: 20-30 lbs
Mini starter before 91 model year: 5 lbs
Aluminum radiator: 5 lbs
Aluminum heads: 40 lbs
Racing tranny(C4) compared to AOD: 25 lbs
Carpet:5 lbs
Fiberglass hood: 10-15 lbs
Fiberglass Hatch 15 lbs
Lexan windows: 50-100 lbs
Composite Valve covers 3 lbs
Heater Core and underdash assembly 25 lbs
Remove InDoor reinforcements and Power window motors in such equiped cars 20 lbs each side.
Change to aftermarket stering wheel on Airbag Equiped mustangs 4 lbs
Radio w/Pre-amp and speakers 15 lbs
Front inner wheel weld covers 5 lbs ea side
Tail pipes 20 lbs
We're getting dangerous!
Rear bunper 40 lbs
Front bumber pre-87 35 lbs 87 & newer 20 lbs

Unsprung weigh savings is more pronounce and have more of an impact on et's when drag racing than dead weigh. Such Items as (wheels/tires, Lightweight brakes,) will have a greater affect resulting on even quicker elaps times than the standard 100lbs is .1 assumption.

Various Transmissions and their Gear Ratios
Trans Name
...................................first.....second....third....fourth....fith....sixth
4L60E........................3.06.....1.63....... 1.07
4L80E........................2.48.....1.48....... 10.7
A833..........................2.47.....1.77....... 1
Ford C4, C6..............2.46.....1.46........1
Muncie M20 wide ratio (1971 and later) 2.56 1.91 1.48 1
Muncie M20 wide ratio (pre 1971) 2.56 1.91 1.48 1
Muncie M21 close ratio (1971 and later)2.2 1.64 1.28 1
Muncie M21 close ratio (pre 1971) 2.2 1.64 1.28 1
Powerglide................1.76 1
Powerglide................1.82 1
Richmond 4-speed...2.43 1.61 1.23 1
Richmond 4-speed...2.64 1.75 1.34 1
Richmond 4-speed...2.64 1.6 1.23 1
Richmond 4-speed...2.88 1.91 1.22 1
Richmond 5-speed...3.27 2.13 1.57 1.23 1
Richmond 5-speed...4.06 2.22 1.57 1.23 1
Richmond 5-speed...4.41 2.22 1.57 1.23 1
Richmond 6-speed...3.27 2.13 1.57 1.23 1 0.76
Richmond 6-speed...3.01 1.88 1.46 1.19 1 0.62
Super T10 cr.............2.43 1.61 1.23 1
Super T10 wr............2.64 1.75 1.33 1
T10 close ratio..........2.2 1.64 1.3 1
T10 wide ratio...........2.54 1.89 1.51 1
T56 ............................3.36 2.07 1.35 1 0.8 0.62
T56.............................2.97 2.07 1.43 1 0.8 0.62
Torqueflite..................2.45 1.45 1
Tremec T56...............2.66 1.78 1.3 1 .74 .50 2.9
Tremec T56...............2.66 1.78 1.30 1 .80 .62 2.90
Tremec T56...............2.97 2.07 1.43 1 .80 .62 2.90
Tremec.......................3.27 1.98 1.34 1 .68
Tremec TR3550 TKO............3.27 1.98 1.34 1 .68
Tremec TR3550 TKO II..........3.27 1.98 1.34 1 .83
Turbo 200-4R............2.74 1.57 1 0.67
Turbo 350...................2.52 1.52 1
Turbo 400...................2.48 1.48 1
Turbo 700-R4.............3.06 1.63 1 0.7