Certain it only does it in 1-2 gears? If so, is it only under acceleration? Does it grind while shifting, or only when in gear and under load? Grinding while shifting usually worn/damaged synchro components. Noise while in gear something else, like damaged bearings or gears themselves. However - just guessing - may not be the 4500 w/a problem (w/o more info).<br>If it'll do it under hard throttle in other gears, I'd say it's the transfer case, rear mainshaft snapring broke. Common problem on 94-98's. Been there, bunch 'a times. Seen a lot of 'em.<br>If it's a ratcheting noise that sounds like gear clash, but disappears quickly under load, I'd bet on the t-case snapring failure.<br><br>If your 4500 is bad, best bet is Standard Transmission (Ft Worth, Tx), for a reman'd unit w/updated parts. <br><br>Limited slip doesn't grind, but will pop or clunk when turning, but usually only when wrong fluid is used (or w/o L.S. additive). Unlikely for LS to make noise on ice, snow, etc.<br><br>All just my worthless .02...<br><br>Regards,<br>-Scott<br><br>