Jet performance chip
Thread Starter
Joined: Dec 2008
Posts: 5
From: New Jersey
Jet performance chip
My uncle gave me a Jet performance chip #80421. It says its for an automatic transmission but why wouldn't it work in my stick shift 2003 mustang gt? Any explanation would be greatly appreciated. 
4th Gear Member
Joined: Mar 2009
Posts: 1,291
From: CA
Don't have a lot of experience with the JET chip, but since it's for an AT, I would guess that the shift points and/or line pressure are changed.
The 80421 seems to be for a F-150 4.6L, and says it can be used with either transmission.
The 80421 seems to be for a F-150 4.6L, and says it can be used with either transmission.
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