i have a 4in lift 0n my 1990k5 (350,700,241) my rear shaft is causeing a viberation on decelleration only, it is too close to the end of the output on the transfer case. does anybody know a doner vehichle that would have the same diameter shaft but 2in longer that i could use? poss. the same 5k w/a 4-speed??? has anybody had a problem w/front shaft being too short w/ 4in lift ramping in the mid 900's?