I have had a Few GM's with the OD Transmissions . What I can Say I did not Like is . When your at Low Speeds 35-40 and it goes into OD . The Car will Lug and the RPM's go to a real Dead spot . Now on car's with 3.23 or Larger Gear gears Like the 1988 F-Body 3.27 Gear and 1987 442 3.73 Gear . They would go into OD at 30-32 MPH and what it felt Like to me was that the Rear end was trying to push the car . Making it even slightly harder to stop fast at that speed . Now this would be more of a Problem on a Car Like Mine that was driven more in the City then the Highway . My Friends that run these OD Trans Build's use a Switch under the dash to Lock out the OD When they are Driven in the City . Yes you could Shift down into 3rd But on my Pick up with the 700R-4 the Lock up Converter jumps in and out at 35 MPR . I said the heck with that and Un-Pluged that Trans Plug . It works Great Around Town now . Yes when your over 50 MPH They are Great . And you can get unreal Power off the Line and Top end . That 442 with the OD and 3.73 Gear Felt Like it never ran out of the Right gear .