yea, get a tlok there exact same amount of work is required to put in gears as to put in tlok and gears... so buy a tlok unit and gears from gefracing.com or get gefracing.com's prices and go to summit if they are out of stock they will price match, only get FMS brand (ford motorsport) you may need a install kit that will have shims/bearings and what not but my gears came with shim sand the install guy got me some bearings so I didnt need any of that. bearings should all be replaced just to be safe... cheap insurance and replace the pinion seal if it needs to be.
for an install get a GOOD place, pay around 200-250 if you can put pay extra to get it done right if thats what it takes.... rear ends cant just be thrown together ask the guys if they know about backlash, pinion depth and wear patterns of the gears just make sure they are a good place, know what they are doing, and give you a warranty on gear noise/whine/brakage due to install.
its just about as cheap to buy a complete 8.8 rear end (gt rear end) and bolt it right up, you can only get up to 3.73 gears with this but.... it will be much stronger, its a direct bolt in and you will have your stock 7.5 for spare or to sell to recoop some money.
8.8 brand new is gonna be 850~ or less including shipping and i belive speedconcepts.com or is it .net.... has them just put lube in it and swap it in and your done.
7.5 will be 600+ for parts and install, parts being 450-500
2003 Cobra Vert (Redfire) #3938 of 5082 @ 05/27/2003
472rwhp/493rwtq -Modification List
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2011 Ford Edge Sport (Red Metallic)