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Old 10-27-2008, 04:13 PM   #16
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not to be condensending but 2.43 is mf-1 and bk1 ,2.19 is mf2 and bk2 they both have smaller diff gear. hence the taller 2.19 ratio. i have been running mf 1 since new and put bk1 rear on my bk2.
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Old 10-27-2008, 04:15 PM   #17
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Originally Posted by JeromeK99 View Post
If you have a black diff gear you probably have a Sport version of the truck.. and it is a 2.56:1 ratio... black tranny case... Same gear now as the XXX-T CR.
Might be the same gear as a XXX-T CR, but the ratio on mine is 2.43.
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Old 10-27-2008, 04:22 PM   #18
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Are you stripping teeth off the gears or ripping out the middle where the balls ride? XXXT (non MF2) used a white diff gear. If the teeth are stripping then you have the wrong diff and/or idler gear causing incorrect mesh.

If the diff isn't tight enough the balls will slide against the metal rings under hard acceleration creating heat that will melt the nylon and cause the inner part to seperate from the outer. When this happens run the diff tighter even though it reduces turning to prevent damage. Another tip from the on-road crowd is to sand the diff rings in a figure8 motion on a flat piece of 200 grit or finer sandpaper before installing so the balls have more grip against it. I speak from experience on this one, we ripped out several diffs on the original xxx and xxxt's before figuring this out.

A softer trigger finger makes a big difference too.
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