That gears and best place to buy...
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I've owned Ford Racing and Richmond. Richmonds are better quality than FR but they are a lot louder, darn near bullet proof though. I would recommend a LSD or Locker depending on what you plan on using the 4.88's for which brings me to my next question, why 4.88's? You lifted or something? 4.10's is about all you need for a street application if that's what you fall under.
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8.8" RING GEAR AND PINION SETS
M-4209-G410M*
PART NUMBER RATIO AXLE
MUSTANG/RANGER/F-150 8.8"
M-4209-F308* 3.08:1 -
M-4209-F327* 3.27:1 -
M-4209-G355A* 3.55:1 -
M-4209-F373N* 3.73:1 ¹ -
M-4209-G410A* 4.10:1 -
M-4209-G410M*(track use) 4.10:1 -
M-4209-G430M* 4.30:1 -
M-4209-G456* 4.56:1 -