Yeah - I hear you guys!! For many years, I used to sand the plates a well - on a peice of very flat marble, and some fine/superfine sandpaper. I had been doing it since the late eighties (well - since i got a ball diff for my optima back in the day anyway!!). Works "ÖK" but doesnt take much to stuff it up - nor do you ever truly get perfect results.
Fred's (B-Fast founder) machinery precision grinds BOTH sides of the manufacturers plates - both main diff rings and thrust washers. His kits also include complete carbide balls for both the main diff and the thrust race. So while on the "outside" it might seem like the kits are expensive, once you add up the cost of the carbide balls, manufacturers plates, the precision equipment and time to do get the plates to standard - the cost is actually quite resonable. Dont forget that BOTH sides of the plates are ground flat, so you are effectively doubling the life of the plate.
For most people - buying the custom equipment to do the same thing for your own diffs is just not economically sensible - especially if the results still wont be as precise as what they are from B-Fast.......
Hey - either way - the product is excellent - and yes - you can get "close" to similar results by buying plates and sanding them yourself - or outlaying more on more specified products, but most people will just do the maths and say its easier and more cost effective to just get the B-Fast kits in the first place.
In reality, do what makes you happy. There are many ways to enjoy the hobby - some love to tinker and do it themselves - thats why it is called a hobby!
I like the products because the save me time - and I know that the parts will be PERFECT every time I fit them. Thats one less thing to worry about on race day or when prepping the race car. Doesnt hurt that they require alot less maintenance too!
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