Which D to drive in on a 89 iroc z automatic.
 

The one with the plain D, or the D in a circle? thanks and dont laugh.:banned:

Re: Which D to drive in on a 89 iroc z automatic.
 

hey man for city i would cruise in D and on highway i would Cruise in OD which is the D with the circle around it

Re: Which D to drive in on a 89 iroc z automatic.
 

Thanks!

Re: Which D to drive in on a 89 iroc z automatic.
 

your welcome

Re: Which D to drive in on a 89 iroc z automatic.
 

wow sinbad, im not gonna laugh here but is this your first car? Yeah I do the same thing.. I drive in "D" Drive in the city and when I get on the Highway I throw it in Circle D ! a.k.a. Overdrive.

Re: Which D to drive in on a 89 iroc z automatic.
 

No, i just wanted to know if its best to drive them like you explained... The city highway thing, a friend of mine told me to use overdrive on the highway, just wanted to make sure.

OD all the time, regardless.

Uh, except at the drag strip . . .

Re: Which D to drive in on a 89 iroc z automatic.
 

I asked a guy at the tranny shop this and he said early cars had hydraulic overdrives while the newer ones had electronic (may be the other way around). The older ones should be in d in the city and the newer ones are fine where ever. Call a shop to get the precise info. I drive my 89 in d in the city.

Re: Which D to drive in on a 89 iroc z automatic.
 

OD most of the time, when I'm just getting around (Saves gas).
D when I'm having a little fun with speed.

Re: Which D to drive in on a 89 iroc z automatic.
 

Really...I'm trying not to laugh. But I think my laughter is more aimed at whoever taught you to drive, be it your parents or the High School instructor.

But I drive mine in OD 99.999% of the time, regardless of city or highway. Besides, the tranny controls itself by starting from 1st gear regardless. By putting it in Drive, your only causing the drivetrain to run in higher RPMs, when it could be spinning slower & lasting longer, as a result.

High RPMs cause more friction, which causes higher temps. Higher temps shorten auto trannies lives.

Re: Which D to drive in on a 89 iroc z automatic.
 

I use D in the city and (D) on the highway. Yes, there is a difference.

Personally, when in (D), my transmission doesn't act right in the lower gears. It slips. Doesn't do it in D. Once I'm up to speed I can shift into (D) without problems.

Re: Which D to drive in on a 89 iroc z automatic.
 

my trans does the same thing. shifts to soon. Its only got 4k on it too so its not your trans. Why have two drives for no reason otherwise? If you where hard on the gas then it wont shift till it has to anyways when its in od right?

Re: Which D to drive in on a 89 iroc z automatic.
 

he was right to ask about that year. that was the last year that the 700r4 trans had a problem with shifting back and forth and burning itself out. it was a common problem and they finally fixed it in the 90 model.
had a family member that worked for gm and the dealers were constantly getting burned out 700's because they would shift themselves between 3rd and 4th so much they just quit working.
sometimes it would burn out everything and sometimes they would lock in 4th - never get into 4th or just stop working.
so it was a good question.

Re: Which D to drive in on a 89 iroc z automatic.
 

c i kinda knew lol. As soon as I get off the hwy mine goes into d. Friend of mine had the same trans go out two times, & I told him years ago how to shift it. He still didn't learn. He has another car mero with trans trouble. May not be the same thing. He had a shift kit put in by a place called royal trans. said when he drives it for the first 30 minutes it revs way up before it shifts, then after that it shifts like it has no kit in it at all.

He let it sit it self out of warranty so he wants me to put a new filter in it. Said it helped the first time for a while. i told him it sounds like the converter is going. Whats your take on that?

Re: Which D to drive in on a 89 iroc z automatic.
 

The real reason your trannies are shifting too soon is this:

they are automatic trannies.

:lmao:

Re: Which D to drive in on a 89 iroc z automatic.
 

What lol, well u have an extra t-56 laying around you can help a bother out with? I hate my trans. Oh well one day I will have the 6 speed.

Re: Which D to drive in on a 89 iroc z automatic.
 

go get a T5 in the meantime and just be careful not to drop the clutch @3500RPMS too often

Re: Which D to drive in on a 89 iroc z automatic.
 

I would have done that, but the guy I bought my car from had just rebuilt the motor and trans. Still only have 4k on them. Guys at the shop should have kick him in the as s for rebuilding a 305, & 700r fart.