"i"
Senior Member
Joined: 09-11-2007
Posts: 1,379
From: Palm Bay, Florida
Living in the flat lands of Florida, I have used "I" gear a couple of times to see what it does. What I saw were higher speed shift points and no shifting into OD. With my auto and a gentle right foot, I'll be in OD at 38 mph. I can feel four distinct shifts when it goes into OD and drop to 1500 rpm.
In my cross country trips I just use D and let the transmission/computer decide when to down shift, which it will do when climbing hills, or high bridges, mostly just out of OD and sometimes down to third gear.
In my cross country trips I just use D and let the transmission/computer decide when to down shift, which it will do when climbing hills, or high bridges, mostly just out of OD and sometimes down to third gear.
Platinum Member
Joined: 05-09-2006
Posts: 6,805
From: "Upland" Mesa, Arizona
Living in the flat lands of Florida, I have used "I" gear a couple of times to see what it does. What I saw were higher speed shift points and no shifting into OD. With my auto and a gentle right foot, I'll be in OD at 38 mph. I can feel four distinct shifts when it goes into OD and drop to 1500 rpm.
In my cross country trips I just use D and let the transmission/computer decide when to down shift, which it will do when climbing hills, or high bridges, mostly just out of OD and sometimes down to third gear.
In my cross country trips I just use D and let the transmission/computer decide when to down shift, which it will do when climbing hills, or high bridges, mostly just out of OD and sometimes down to third gear.
Also, I believe our trans is designated as a 4T45e. Unless GM has changed their "codings", the 4T indicates a 4 speed and the "e" as, "electronic".
Moderator
Joined: 01-23-2009
Posts: 26,484
From: Fredericksburg,VA
No, 4th gear is OD ! Then the TQ locks up. The E is because the "commands" to shift gears come from the TCM, instead of the old fashioned way.
When I am driving gently I can feel the TQ lock up at around 40MPH.
I hate using my stupid phone for this stuff.
When I am driving gently I can feel the TQ lock up at around 40MPH.
I hate using my stupid phone for this stuff.
Platinum Member
Joined: 05-09-2006
Posts: 6,805
From: "Upland" Mesa, Arizona
Ahhhhhh, I see what is happening. I'm using the same terms for TQ and OD. In other words, I was saying OD for the TQ.
So, the trans is a 4 speed NOT including the TQ?
Just for comparison sake, mine locks up at exactly 44 MPH.
So, the trans is a 4 speed NOT including the TQ?
Just for comparison sake, mine locks up at exactly 44 MPH.
Moderator
Joined: 01-23-2009
Posts: 26,484
From: Fredericksburg,VA
Yes, but.... TorqueConvertor lock is not a gear, it just turns the trans into a "standard" transmission, until that clutch is released and the TC can freewheel again.
OOPS. I see that I have been typing a Q when I mean to be typing a C., Sorry for confusing everybody.:embarrassed:
Basically there is a clutch, but it only controls the TC for better MPG while at cruising speed.
OOPS. I see that I have been typing a Q when I mean to be typing a C., Sorry for confusing everybody.:embarrassed:
Basically there is a clutch, but it only controls the TC for better MPG while at cruising speed.
Thread Starter
Senior Member
Joined: 10-13-2013
Posts: 101
From: Blaine WA
guess I should have said I feel it shifting into only 3 gears, not 3 shifts. Maybe you all could help me figure out things using the tach.
So how many rpm's should it be turning at 60 mph if it's in a fourth gear? (everything stock)
So how many rpm's should it be turning at 60 mph if it's in a fourth gear? (everything stock)
