Why 3.90's? Go 4.10's unless your gonna run an S/C or squeeze. Than go 3.73. I installed 3.73's and to this day still kick myself in the arse for not going 4.10's
Does anyone have PRO 5.0 3.90's or Motive 3.90's on their car? im looking to get 3.90's but Ford doesnt make 3.90's ..so can i trust these other companies?
Blue03Gt, The motive gears are very high quality. I'm actually thinking of going 3.90s when its time for gears. I havn't heard anybody complain about them as long as they are installed correctly.