It used to be the thing to put the four speed case (ever so slightly modified for the shifting o/d rail) in front of a sag overdrive unit, and making it a poor boy's 5 speed. Armed with a manual o/d switch, a split manifold six could make a decent diesel truck sound (and about as much accelleration) by using all 10 available ratios. The o/d would open up even more rear axle choices- use it as an o/d, or as an operable gear. Finding the o/d unit will be tough although older borg warner o/ds may be adaptable. The 3.11 low gear four speeds were plentiful in Vegas.
Last edited by edski; 11/30/10 12:04 PM.
