AUTOMATIC DOWN SHIFT CLUNK
Thread Starter
Instructor
Joined: Aug 2003
Posts: 201
Likes: 0
From: Iowa
AUTOMATIC DOWN SHIFT CLUNK
1990 Automatic, when left in drive and slowing down for a stop should you be able to feel the car down shift? It also has a clunking noise when this is happening? :confused:
Cruising
Joined: Sep 2003
Posts: 11
Likes: 0
From: Sanborn IA
Re: AUTOMATIC DOWN SHIFT CLUNK (XCELR8R)
When the dealer fixed it, what was the cost? Also, what do you mean by TSB? Mine upshifts OK, doesn't slip, but has the "clunk" and can feel it shift down into low gear.
Burning Brakes
Joined: Aug 2000
Posts: 984
Likes: 1
From: Cincinnati OH
Re: AUTOMATIC DOWN SHIFT CLUNK (VERLYN)
TSB = technical service bulletin
I had it done under warranty, the receipt shows it would have been $196.10 total for parts and labor. This is from 1992, it will probably cost more now.
They basically replaced a spring and spacer:
Bulletin: 91-372-7A (3-2 COASTDOWN CLUNK)
Parts:
8683950 Fix Kit, Transmission
8657926 Filter Kit
(plus trans fluid)
Labor:
Installed new servo spring and recondition servo, r&r valve body and replace spacer plate
[Modified by Vince Ivanc, 8:11 PM 9/9/2003]
I had it done under warranty, the receipt shows it would have been $196.10 total for parts and labor. This is from 1992, it will probably cost more now.
They basically replaced a spring and spacer:
Bulletin: 91-372-7A (3-2 COASTDOWN CLUNK)
Parts:
8683950 Fix Kit, Transmission
8657926 Filter Kit
(plus trans fluid)
Labor:
Installed new servo spring and recondition servo, r&r valve body and replace spacer plate
[Modified by Vince Ivanc, 8:11 PM 9/9/2003]
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
Safety Car
Joined: Jul 2001
Posts: 3,833
Likes: 0
From: Orange County California
Re: AUTOMATIC DOWN SHIFT CLUNK (Vince Ivanc)
I think this is ok... I think most AT vettes experience this wehnd driving in "D". I believe it is the sound of tighter gearing. But dont take my word for it.
Drifting
Joined: Jan 2002
Posts: 1,608
Likes: 0
From: I Hate Tourists FL
Re: AUTOMATIC DOWN SHIFT CLUNK (XCELR8R)
Mine does this in D and OD but on the upshift not as noticeable and on the downshift more noticeable. The tranny is relatively new maybe a year old/5000 miles. I was worried it was a ujoint or wheel bearing but it only does it in 2nd gear no other ones and the car doesnt make the tell tell signs of a bad ujoint or bearing. Weird but I am still worried about taking in on a long trip to texas
Le Mans Master
Joined: Oct 2000
Posts: 6,362
Likes: 30
From: Oak Harbor WA
Re: AUTOMATIC DOWN SHIFT CLUNK (Vince Ivanc)
Hmmm, wonder if that was the 3-2 servo and spring that was replaced?? Something to look into and then possibly replace during my next tranny servicing.
BUT:
I want to install my new C-beam torque plates first and see if it goes away before taking the tranny apart. :seeya
BUT:
I want to install my new C-beam torque plates first and see if it goes away before taking the tranny apart. :seeya
Race Director
Joined: Aug 2002
Posts: 17,367
Likes: 1
From: Kentucky
Re: AUTOMATIC DOWN SHIFT CLUNK (Goody)
Mine has a shift kit in it and I have the "clunk" sound. When it goes to shift into 1st? it just grabs quick and hard. I lost the OD in my tranny a couple months ago and since the rebuild it shifts the same, but just not as loud.
