My son has a 2000 chev LT 4+4 has blew the rear diff with 373 gears cant find one does any one know what years will fit have a 1994 diff would like to send it to him if it will fit if not any more years that will fit tyall

 

i think your 1994 diff will have 342 something close to that. if you want to know the gear ratio of it spin the wheel in 1 complete turn and the drive shaft should spin 3.4 times if there 340 gears