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I cannot recommend this guy enough:

Sullivan's High Impact Tuning & Performance -Auto repair & high performance upgrades

He's located in Plainfield, Illinois (Joliet) and I don't think I'll ever go anywhere else to have something installed. He definitely knows his Fords.

I was charged $475 for the install or something like that. You could probably try to find something even cheaper, but everywhere I went wanted a lot for the install or didn't even remotely seem like they had any idea how to do it. My 4.10 has no howling on deceleration, only a slight whine around 35-45 mph. A lot of it has to do with the rear end and the new bushings.

He also deals with SCT and a bunch of vendors, so he's good for tuning too. He did the gear install the same day.

Edit: You live in the north burbs though, this is probably 30 miles south going down I-55 from Chicago.
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