NAIOA.comNAIOA.comNAIOA.com
 Create an Account
 

  
NAIOA Impala Forums :: View topic - How many speeds does my trans have?
GarageGarage    1/4 Mile Table1/4 Mile Table    Forum FAQForum FAQ    SearchSearch    UsergroupsUsergroups   MedalsMedals
MemberlistMemberlist   ProfileProfile    Watched TopicsWatched Topics    Log in to check your private messagesLog in to check your private messages    Log inLog in 

How many speeds does my trans have?

 
Post new topic   Reply to topic    NAIOA Impala Forums Forum Index -> 2000-2005 Engine, Exhaust and Transmission
View previous topic :: View next topic  
Author Message
9C3
Resident
Resident


Joined: Aug 19, 2012
Posts: 591
Posts per day: 0.32
Location: PALM BEACH FLORIDA

2005 Chevrolet Impala


PostPosted: Sat May 11, 2013 3:22 pm    Post subject:  How many speeds does my trans have? Reply with quote

So I've been driving my 05 Impala 9C3 car for almost 9 months. Runs great, & I always keep the gearshift lever in "D" which to me is "OD" or 4th gear. So yesterday I was driving around town & decided to leave it in 3rd gear, since I wouldn't be going over 35 mph. Guess what, the car still shifted into 4th gear. So today I drove a little faster & this is what I realized. At 55 mph when I shifted from "D" to "3", the car did downshift a gear, but what I think really happened is the car actually shifted from 4th lockup, to 4th no lockup. When I start from a stop in "3" it shifts 3 times into 4th gear. But when I start from a stop in "D" it shifts 4 times into what I assume is 4th lockup. Is this the way these cars work, or is this how 9C1/9C3 cars are calibrated to shift? GARY

_________________
2005 9C3 IMPALA
Back to top
View user's profile Send private message
IffyG
NAIOA Moderator
NAIOA Moderator
Silver Contributor (Amount: 1) Silver Contributor


Joined: May 19, 2007
Posts: 13731
Posts per day: 3.64
Location: Nashville, TN

2002 Chevrolet Monte Carlo
1998 Oldsmobile Intrigue
2009 Chevrolet Malibu


PostPosted: Sat May 11, 2013 3:40 pm    Post subject:   Reply with quote

All 4T65Es are 4 speed. While you can set the car to be in X gear, if the PCM figures out you are doing something that can damage the car, it will override. Without a scan gauge to tell you what the PCM is doing, my guess if you are calling the shift from TCC lock to TCC unlock as an additional shift. The torque converter will lock in 3rd and 4th gear.

_________________
helldorado wrote:
GLWTGFY. Big Thumbs Up

Dan wrote:
Protip: If you don't know what you're doing, don't do it.


d
Back to top
View user's profile Send private message
9C3
Resident
Resident


Joined: Aug 19, 2012
Posts: 591
Posts per day: 0.32
Location: PALM BEACH FLORIDA

2005 Chevrolet Impala


PostPosted: Sat May 11, 2013 3:53 pm    Post subject:   Reply with quote

Since I never exceeded 2500 RPM, I don't think the tranny was upshifting to save anything. But what does make sense is in 3rd, it did go into lock up which seems like an upshift into the next gear, as I watch the revs drop. I didn't know the conv could lock up in 3rd gear. When I had a 70 Z-28, I would hold the trans in low gear, & at 6200 RPM it would upshift into 2nd, even though the gearshift lever was still in 1st. That Turbo 400 wanted to launch the 12 bolt rear through the back seat when that happened. I only did that a few times. So I guess when the shift indicator is in 3rd, but I feel the shift into 4th, it's really locking up in 3rd. Thanks. GARY

_________________
2005 9C3 IMPALA
Back to top
View user's profile Send private message
Pitch Black SS
NAIOA Owner / Founder
NAIOA Administrator
NAIOA Administrator


Joined: Mar 08, 2004
Posts: 12756
Posts per day: 2.58
Location: Tullahoma, TN

2004 Chevrolet Impala
1982 Chevrolet Malibu
2007 Chrysler 300C
1986 Chevrolet Monte Carlo


PostPosted: Mon May 13, 2013 11:29 am    Post subject:   Reply with quote

the PCM uses more parameters than just RPM to shift. It may have shifted into 4th as iffy said, but may have also been the TQ locking up to protect the clutches form over slipping

_________________
Back to top
View user's profile Send private message Visit poster's website AIM Address
9C3
Resident
Resident


Joined: Aug 19, 2012
Posts: 591
Posts per day: 0.32
Location: PALM BEACH FLORIDA

2005 Chevrolet Impala


PostPosted: Mon May 13, 2013 11:47 am    Post subject:   Reply with quote

I'll just leave it in "D" & not try to figure out what gear it's in. I do notice it seems to hold 3rd gear a little longer when the motor is cold. My GF's 06 Monte Carlo does the same thing. So far both cars shift real good, & both had recent filter/fluid changes. GARY

_________________
2005 9C3 IMPALA
Back to top
View user's profile Send private message
VictoryRed09
Forum Regular
Forum Regular


Joined: Jul 06, 2010
Posts: 263
Posts per day: 0.1


2009 Chevrolet Impala


PostPosted: Mon May 13, 2013 2:10 pm    Post subject:   Reply with quote

The Transmission is a 4 Physical gears plus lock up in the convertor.

Some people count the Lock up as a gear because, the tach shows a Decrease in rpm on engagement.

So, 4 or 5, it all depends on if you count the lock up as a gear change, or NOT.
Back to top
View user's profile Send private message Send e-mail
Bill58
Resident
Resident
Silver Contributor (Amount: 1) Silver Contributor


Joined: Oct 31, 2008
Posts: 650
Posts per day: 0.2
Location: Maryland

2006 Chevrolet Impala
2005 Chevrolet Impala


PostPosted: Mon May 13, 2013 4:24 pm    Post subject:   Reply with quote

4T65E
4 speed
T transverse
65 6500lbs gvwr
E electronic control
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    NAIOA Impala Forums Forum Index -> 2000-2005 Engine, Exhaust and Transmission All times are GMT - 4 Hours
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum

Powered by phpBB © 2001, 2005 phpBB Group
Forums ©
All logos and trademarks in this site are property of their respective owner. Comments and posts are property of the poster. All other content is © 2008 by the NAIOA.


Use of this site constitutes agreement with the NAIOA Terms of Service (TOS)


PHP-Nuke Copyright © 2005 by Francisco Burzi. This is free software, and you may redistribute it under the GPL. PHP-Nuke comes with absolutely no warranty, for details, see the license.
Server Local Time: September 19, 2017, 1:56:34 pm
Page Generation: 0.10 Seconds ( SQL 29:117 in 0.01 Seconds )