The answer was on Traxxas's site...
http://monster.traxxas.com/showthread.php?t=480547


Quote from Squirlz on the Traxxis Website
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"Differences with prices:

Body & Accessories
7111 – Revo Body = $20.00
7012 – Slash Body = Call
7121 – Revo Wing Mount = $5.00
7122 – Revo Wing = $10.00

Front Bumper
7135 – Revo = $6.50
7035 – Slash = $8.00

Axels
7151 – Revo Drive Shaft = $8.00 (each)
7051 – Slash Drive Shaft = $8.00 (each)
7151X – Revo CVD’s = $70.00 (set)
7051X – Slash CVD’s = $70.00 (set)

Suspension
7132 – Revo Rear Arm Set = $8.00
7032 – Slash Rear Arm Set = $8.00
7138 – Revo Toe Link Front & Rear = $6.00
7038 – Slash Toe Link Front & Rear = $6.00
7138X – Revo Alu Toe Links = $32.00
7038X – Slash Alu Toe Links = $32.00
7140 – Slash Springs (.82) = $4.00
7141 – Slash Springs (.88) = $4.00
7142 – Slash Springs (.94) = $4.00
7143 – Slash Springs (1.02) = $4.00
7145 – Revo Springs (1.76) = $4.00
7146 – Revo Springs (1.92) = $4.00
7147 – Revo Springs (2.06) = $4.00
7148 – Revo Springs (2.22) = $4.00
7118 – Revo Push Rods = $6.00
7018 – Slash Push Rods = $6.00
7118X – Revo Alu Push Rods = $23.00
7018X – Slash Alu Push Rods = $23.00

Tires & Wheels
7174A – Revo Tires & Wheels Assembled = $22.00
7073A – Slash Tires & Wheels Assembled = $19.00

Transforming a Slash to Revo would cost about $123.50 without upgrades, $115.50 without bumper
Transforming a Revo to Slash would cost about $107.00 without upgrades

If you buy a Slash from Towerhobbies not including shipping you are paying $400.49 to convert to a Revo.
If you buy a Revo from Towerhobbies not including shipping you are paying $396.99.

Let me know if i missed something. I did leave out decals and optional bodies but the rest should be there"
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Just incase anyone else needed to know!!!!