C4 Vette Registry - The Best Resource on the Net for C4 Vettes! C4 Vette
Forums -> C4 Driveline Components
Not Logged In! Login or Register!  Users Online: 9 / Help 
Features   CoolC4 Corvette Parts Auctions

Supporting Vendors
Bair's Corvettes
CorvetteClothing.com
Mid America Motorworks
VetteBookStore.com
Volunteer Vette Products

C4 of the Month
None Current
Enter Yours Today!
Vanity Plates
NEVRL8T
LeesVette
Featured Links

Buy Now
Motor Trend - $5 for 12 issues.
Motor Trend
Only $5 for 12 issues.


Collector's Originality Guide Corvette 1968-1982 (Paperback)
Collector's Originality Guide Corvette 1968-1982 (Paperback)


Kindle
Kindle


Corvette 50th Anniversary
Corvette 50th Anniversary



| Hide Signatures and Profile Pics

 New Topic New Topic Post Reply Reply New Poll New Poll Search     Search Page [1]  
2/28/17 6:21pm - Original Message: 'Over drive on automatic'
aldocar
Standard Member
- Send Private Message


Joined: 12/3/2016
Posts: 25
Just went for my first ride of the season its been nice and all the snow for now is gone. Is the overdrive meant to be used on the turnpike?  The reason I ask there is slight vibration when accelerating but if I use the d1 there is no vibration at all.   I just purchased the car in late November it runs great except for the slight vibration in overdrive. I use d1 driving around town.    Take care.

____________________________________
 Reply Reply  Quote Reply w/Quote
 
Support C4VR!
Suport our advertisers
3/4/17 11:46am - Reply: 'Re: Over drive on automatic'
Adams' Apple
Standard Member
Moderator
- Send Private Message


Duncanville, TX - USA

Vette(s):
1985 Coupe-L98/Auto,Bright Red/Carmine. 1974 Coupe-L48/4speed, Medium Red Metallic/Black Deluxe.

Joined: 3/18/2009
Posts: 2080
O/D can be used anytime....the system is designed to "know" what gear is appropriate for the situation.
If you feel a "vibration" on acceleration in O/D, most likely what you are feeling is a torque converter "shudder", OR an engine misfire. My suggestion would be to have someone do a diagnostic scan to see if there are any engine related codes set, and go from there.


____________________________________
Joel Adams  
My Link

 
   
(click for Texas-sized view!)             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
 Reply Reply  Quote Reply w/Quote
3/6/17 5:43pm - Reply: 'Re: Over drive on automatic'
aldocar
Standard Member
- Send Private Message


Joined: 12/3/2016
Posts: 25
Thank you for your input I will take your advice.

Al


____________________________________
 Reply Reply  Quote Reply w/Quote
3/11/17 2:34pm - Reply: 'Re: Over drive on automatic'
wolfuser
Standard Member
- Send Private Message



Vette(s):
1987 C4 convertible 350ci auto white / red / white top appx 18k mls

Joined: 11/15/2012
Posts: 12
Hi,

if you go to "overdrive", 2 things happen. first, the torque converter lockup clutch is activated and will provide a direct drive thru the converter, eliminating slip. this is noticeble as rpm comes down when the clutch engages. however, locking the torque converter removes vibration damping from the drive train, so that a slight resonance is encountered at appx 1100-1200rpm when accelerating on a light throttle. as soon as the throttle is opened a bit more, the lockup clutch disengages, rpms rise as the torque converter permits "slip".
and the 2nd thing.... only in OD is the 4th gear available. thats why a little reminder lights up in the road speed readout should one forget to change from D to OD and tries to go faster.

D is fine for city driving or winding roads where one might encounter that 1100rpm period more often. 

cheers
Wolfram
 Reply Reply  Quote Reply w/Quote
3/12/17 4:37pm - Reply: 'Re: Over drive on automatic'
aldocar
Standard Member
- Send Private Message


Joined: 12/3/2016
Posts: 25
Thank you I must be senile but it makes that noise at around 40 at 1100rpm not at start up and when I give it gas it stops this is all in OD.  I took it out a few days ago as the weather was nice and it drove fine in OD it seems to like a heavier throttle at lower speeds.  We are expecting some bad weather so car is back in hibernation.  I have not driven it much as I bought the car in November.  I did not see any light in D I must have been below the limit. Thank you.  The car idles fine and has no skips I think I was to light on the gas in OD.  I do love the feel of the car it makes me smile a lot. Take care Al.

____________________________________
 Reply Reply  Quote Reply w/Quote
 New Topic New Topic Post Reply Reply New Poll New Poll Search     Search Page [1]  
 Forums -> C4 Driveline Components
(Moderator: Adams' Apple, Strats-N-Vettes, eddie20890)
 

 
Official C4 Vette Registry Community:
Home | Forums | Email | Who's Online | Clubs | Events | Member Stats

Other Official C4 Vette Registry Areas:
Members | Research | Shop | My Account | About C4VR
 

Corvette is a registered trademark of the General Motors Corporation(GM) & Chevrolet Motor Division. Vette Registries, LLC is responsible for all site content (except for member submitted content or where otherwise noted) and does not claim or imply that Chevrolet or GM is responsible for Official C4 Vette Registry content. Vette Registries, LLC is independent from GM and is not affiliated with, sponsored or supported by GM.  Copyright/trademark/sales mark infringements are not intended, or implied and are in fact used to support GM, Chevrolet and Corvette

Official C4 Vette Registry content is Copyright 2001-2017, Vette Registries, LLC. Content may not be reused without written consent. All Rights Reserved. NS

Corvette (Vette) Model Years on this site: 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 30