I installed the shift plus in last week. I am very happy with it, but there is a downside. Normal and setting #1 work great, they do what is expected. But the #2 setting is harse but no real gain as the motor (4.6) seems to fight for rpm. It was simple to install, 45 minutes. For 89 bucks here in Canada it was still worth it.

 

Funny,mine had absolutely no effect in the number 2 setting,felt the same as #1.
I bought a Superchip,and got rid of mine.
Mike from performance products(Superchips_Distributor) was telling me that the shiftplus works by spiking the voltage to the shift solienoids ,
an already weak link in our transmissions
I somehow didn't want to use it that much
after being enlightened about that.......98

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98 F-150 4.6 Litre XLT2wd Ext. cab
prarie tan/tan int.
K/N gen.II fipk
custom dual exh/gibson rectangle tips/rear exiting.
color matched snuglid
Superchip!!!
Westin nerfs blk .powdercoat
Clear front corners
Cobra 75WXST cb w/weather alert
Kenwood cd w/Radio Shack speakers,don't laugh it sounds pretty good
Viper 500HF Security system
On the way/wheels,tires,air dam, etc..etc.......
doin the monochromatic boogie
on the front end.Billet grilles on order
www.my-f150.com
Fender Guitars,ROCK!!!