? about D or OD

[Chrisblazzer89]

Correct answer depends on year , the indicators are different . My 83 says "Automatic Overdrive" above the indicator . The shift pattern is P-R-N-D-3-2-1 .

Newer truck/ k5'S ,( MAYBE AROUND 87 ???)have P-R-N-OD-D-2-1-

mine is like this P-R-N-OD-D-2-1-

 

[6.2Blazer]

I gotta disagree with you here.
My 85 700r4 definitely shifted a lot harsher in Drive than Overdrive. After talking with a local trans shop (cert. niase) he said the fluid path was different when in drive, causing the harshness. And the TV cable was properly adjusted.

Well, don't know what to tell you. I work with a guy who was GM trained and certified to rebuild transmissions and he confirmed the same thing I already told you. He said the only possible explanation was that when in D it applies an over-running clutch (allows some compression braking), this shouldn't make a difference if everything was working properly but if the clutch packs were worn and possibly slipping some than the over-running clutch could make it feel harsher because it wasn't slipping as much.

Well of course the fluid path is different between OD and D...it has to keep the fluid from applying the 3-4 clutch pack.

 

[76zimmer]

It did it since new, and didn't really cause a problem with anything, but it was just an observation in my truck.