C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

4+3 Questions?

Thread Tools
 
Search this Thread
 
Old Sep 21, 2004 | 02:44 PM
  #1  
rsauron's Avatar
rsauron
Thread Starter
Advanced
 
Joined: Aug 2004
Posts: 98
Likes: 0
From: Miami FL
Default 4+3 Questions?

I have a 85.. with the 4+3. About 2 months ago, I noticed when downshifting in 2nd gear. it would jump out of gear. It does not jump out of gear when accel... in 2nd only when dowshifting. I think this is the syncro. Right? I know a rebuild is coming soon.. but this something that is really bothering me. with in the last 2 weeks.. I am getting alot of noise from the tranny. when the car is idleing in neutral I get a loud knocking noise. when I push the clutch in the knocking slowes down and goes away.. I guess is the throwout bearing.. Right?
Well here is my real question. I live in Miami. Anyone know anyone in the South Florida area that is good with the 4+3 trannys.. I mean this is not a popular tanny so I figured it would be better to ask if anyone knows anyone that has exprince with this tranny.. What is a going price to get this tranny rebuilt? Opinions are welcome'd.
Reply
Old Sep 21, 2004 | 05:42 PM
  #2  
rsauron's Avatar
rsauron
Thread Starter
Advanced
 
Joined: Aug 2004
Posts: 98
Likes: 0
From: Miami FL
Default

Come on... some help please
Reply
Old Sep 21, 2004 | 05:48 PM
  #3  
wawctw's Avatar
wawctw
Advanced
 
Joined: Jun 2004
Posts: 81
Likes: 0
From: Manchester CT
Default

I have an 87 with that transmission. If it pops out of gear generally it is a syncro or a worn gear. As to the noise usually a throwout bearing makes a squealing noise when you push in the clutch. It could be a worn pilot bearing allowing the input shaft to wobble. How many miles on it? It may just be worn out. I only have 30 k on mine so it is not a good judge.
Reply
Old Sep 21, 2004 | 05:58 PM
  #4  
lead foot 85 vet's Avatar
lead foot 85 vet
Drifting
 
Joined: Dec 2001
Posts: 1,313
Likes: 1
From: providence ut
Default

Originally Posted by rsauron
I have a 85.. with the 4+3. About 2 months ago, I noticed when downshifting in 2nd gear. it would jump out of gear. It does not jump out of gear when accel... in 2nd only when dowshifting. I think this is the syncro. Right? I know a rebuild is coming soon.. but this something that is really bothering me. with in the last 2 weeks.. I am getting alot of noise from the tranny. when the car is idleing in neutral I get a loud knocking noise. when I push the clutch in the knocking slowes down and goes away.. I guess is the throwout bearing.. Right?
Well here is my real question. I live in Miami. Anyone know anyone in the South Florida area that is good with the 4+3 trannys.. I mean this is not a popular tanny so I figured it would be better to ask if anyone knows anyone that has exprince with this tranny.. What is a going price to get this tranny rebuilt? Opinions are welcome'd.
Actually when you push in the clutch that's when your turning or using the throw out bearing, normally it's not being used, the engine is turning the trans. also when you push in the clutch you stop turning the transmission gears which stops the sound your hearing.....popping out of secount and the noise means I'm sorry to say you need a rebuild, the good part is the best doug nash 4+3 rebuilders in the country are in Fl....gear venders......look them up on the enternet.
Reply
Old Sep 21, 2004 | 06:57 PM
  #5  
ZylaRace's Avatar
ZylaRace
Drifting
10 Year Member
 
Joined: Mar 1999
Posts: 1,931
Likes: 1
From: Norcross GA
Default

Slipping out of gear,... worn synchro. I'd put $ on it. But you can expect the need for mroe parts as well. To fix this, all you need a 1/2 decent trans shop. The prob's you are talking about are in the T10 gear box. A very common gear box.
Reply
Old Sep 21, 2004 | 10:16 PM
  #6  
CentralCoaster's Avatar
CentralCoaster
Team Owner
 
Joined: May 2002
Posts: 24,337
Likes: 25
From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
Default

Originally Posted by ZylaRace
Slipping out of gear,... worn synchro. I'd put $ on it. But you can expect the need for mroe parts as well. To fix this, all you need a 1/2 decent trans shop. The prob's you are talking about are in the T10 gear box. A very common gear box.

The knocking noise is internal to the trans. I think I have a bad main bearing up front, which makes a metallic noise at idle, and esp while engaging.

Mine slips out of 3rd occasionally during decel from high rpms. I've heard 2nd gear synchro is the first to go.
Reply
Old Sep 22, 2004 | 02:09 AM
  #7  
rsauron's Avatar
rsauron
Thread Starter
Advanced
 
Joined: Aug 2004
Posts: 98
Likes: 0
From: Miami FL
Default

Originally Posted by lead foot 85 vet
Actually when you push in the clutch that's when your turning or using the throw out bearing, normally it's not being used, the engine is turning the trans. also when you push in the clutch you stop turning the transmission gears which stops the sound your hearing.....popping out of secount and the noise means I'm sorry to say you need a rebuild, the good part is the best doug nash 4+3 rebuilders in the country are in Fl....gear venders......look them up on the enternet.
Anyone have a link or Phone number to this Gear Venders.. All I found on the net was Gear Vendors and they are in Cali.. not Florida.. thanks for all the help
Reply
Old Sep 22, 2004 | 11:09 AM
  #8  
lead foot 85 vet's Avatar
lead foot 85 vet
Drifting
 
Joined: Dec 2001
Posts: 1,313
Likes: 1
From: providence ut
Default

Try gearzone.........I know there's one in FL. I've bought from them two times most recently this summer.......very helpful people , can't remember exactly where ....tampa?...I had mine rebuilt by AMCO two years ago and had to buy the rebuild kit from these people,,AMCO had never seen a doug nash 4+3 before...after the rebuild the transmission had a bearing that was walking on the shaft and taking out the oil seal between the overdrive and 4-speed ....its been in the shop two summers in a row.....gearzone if thats who it is knew exactly what the problem was after i told them the oil seal was leaking between the overdrive and 4-speed....had AMCO call them and now its fixed... I had to pay AMCO 1/2 of the labor two times plus the original repair bill ($1200.00)....they only have a 90 day warrenty.....I was lucky to get any discount at all.......use them if you can you'll get a better rebuild or order a rebuild though the mail and have someone swap the trans..........it would have saved me $700.00
Reply
Corvette Stories

The Best of Corvette for Corvette Enthusiasts

story-0

2027 Chevrolet Silverado 1500 First Look: Everything You NEED to Know!

 Michael S. Palmer
story-1

5 Best & 5 Worst Corvette Daily Drivers

 Joe Kucinski
story-2

The Headlights of Every Corvette Generation Explained

 Joe Kucinski
story-3

5 Best & 5 Most Overrated Corvette Track Packages of All Time!

 Joe Kucinski
story-4

Every 2027 Corvette Engine Explained

 Joe Kucinski
story-5

Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette

 Verdad Gallardo
story-6

10 Ugly Corvettes That We Still Kinda Love

 Joe Kucinski
story-7

Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer

 Brett Foote
story-8

10 Things Every Corvette Owner Needs (2026 Edition)

 Michael S. Palmer
story-9

8 Most "Only Corvette Owners Understand" Quirks and Problems

 Pouria Savadkouei
Old Sep 22, 2004 | 12:30 PM
  #9  
ZylaRace's Avatar
ZylaRace
Drifting
10 Year Member
 
Joined: Mar 1999
Posts: 1,931
Likes: 1
From: Norcross GA
Default

gearzone.net (heard that Paul @ Gearzone is no longer doing 4+3 work) Sold parts to skspeed.com
Also try: www.pipersauto.com/4speeds.html (800 365-1102) or www.skspeed.com/aboutsk/transshop (800 846-4252)Brian
Reply
Old Sep 22, 2004 | 12:31 PM
  #10  
ZylaRace's Avatar
ZylaRace
Drifting
10 Year Member
 
Joined: Mar 1999
Posts: 1,931
Likes: 1
From: Norcross GA
Default

gearzone.net Boca Raton Fla (heard that Paul @ Gearzone is no longer doing 4+3 work) Sold parts to skspeed.com
Also try: www.pipersauto.com/4speeds.html (800 365-1102) or www.skspeed.com/aboutsk/transshop (800 846-4252)Brian
Reply
Old Sep 22, 2004 | 12:47 PM
  #11  
scorp508's Avatar
scorp508
Team Owner
Supporting Lifetime Gold
25 Year Member
Liked
Loved
Community Favorite
 
Joined: Mar 2000
Posts: 83,384
Likes: 88
From: Boston, MA
Default

Originally Posted by ZylaRace
gearzone.net Boca Raton Fla (heard that Paul @ Gearzone is no longer doing 4+3 work) Sold parts to skspeed.com
Also try: www.pipersauto.com/4speeds.html (800 365-1102) or www.skspeed.com/aboutsk/transshop (800 846-4252)Brian
I think they sold off the overdrive stuff to SKSpeed & Brian, but I'm not sure about the 4-speed part. They may still do the work on that half.
Reply
Old Sep 22, 2004 | 01:04 PM
  #12  
ZylaRace's Avatar
ZylaRace
Drifting
10 Year Member
 
Joined: Mar 1999
Posts: 1,931
Likes: 1
From: Norcross GA
Default

Originally Posted by scorp508
I'm not sure about the 4-speed part.
Yeah, that's what I ment to say. I'm sure they still work on the gearbox section.
Reply
Old Sep 23, 2004 | 02:52 AM
  #13  
olman's Avatar
olman
Racer
 
Joined: Mar 2004
Posts: 311
Likes: 0
From: Oakley Ca
Default

I couldn't recommend S and K Speed. I got one of their rebuilt OD units and with just over 20K miles it is on it's way out again. I don't beat this car. Brian also screwed me on the core charge.
Reply
Old Sep 23, 2004 | 09:35 AM
  #14  
scorp508's Avatar
scorp508
Team Owner
Supporting Lifetime Gold
25 Year Member
Liked
Loved
Community Favorite
 
Joined: Mar 2000
Posts: 83,384
Likes: 88
From: Boston, MA
Default

Originally Posted by olman
I couldn't recommend S and K Speed. I got one of their rebuilt OD units and with just over 20K miles it is on it's way out again. I don't beat this car. Brian also screwed me on the core charge.
Wow, that sucks to hear. Thats honestly the 1st negative story I've heard about them.
Reply

Get notified of new replies

To 4+3 Questions?





All times are GMT -4. The time now is 02:07 PM.

story-0
2027 Chevrolet Silverado 1500 First Look: Everything You NEED to Know!

Slideshow: Is the 2027 Chevrolet Silverado 1500 the best Silverado yet?

By Michael S. Palmer | 2026-06-16 08:01:12


VIEW MORE
story-1
5 Best & 5 Worst Corvette Daily Drivers

Slideshow: 5 best and 5 worst Corvette daily drivers

By Joe Kucinski | 2026-06-15 10:32:13


VIEW MORE
story-2
The Headlights of Every Corvette Generation Explained

Slideshow: The headlights of every Corvette generation explained

By Joe Kucinski | 2026-06-15 10:17:14


VIEW MORE
story-3
5 Best & 5 Most Overrated Corvette Track Packages of All Time!

Slideshow: The 5 best and 5 most overrated Corvette track packages ever.

By Joe Kucinski | 2026-06-09 12:46:45


VIEW MORE
story-4
Every 2027 Corvette Engine Explained

Slideshow: Every 2027 Corvette engine explained

By Joe Kucinski | 2026-06-09 12:16:31


VIEW MORE
story-5
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette

Slideshow: A Jaguar designer's personal project imagines what a modern front-engined Corvette might look like if Chevrolet revisited the golden age of the Stingray.

By Verdad Gallardo | 2026-06-08 19:53:43


VIEW MORE
story-6
10 Ugly Corvettes That We Still Kinda Love

Slideshow: 10 ugly Corvettes that we still kinda love.

By Joe Kucinski | 2026-06-03 10:34:17


VIEW MORE
story-7
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer

A lot of money has changed hands at the online auction house over the years.

By Brett Foote | 2026-06-03 10:21:50


VIEW MORE
story-8
10 Things Every Corvette Owner Needs (2026 Edition)

Slideshow: 10 great gifts Corvette enthusiasts actually want for Father's Day!

By Michael S. Palmer | 2026-06-03 15:43:40


VIEW MORE
story-9
8 Most "Only Corvette Owners Understand" Quirks and Problems

Slideshow: These are the quirks, annoyances, and oddly lovable problems that every Corvette owner eventually learns to live with.

By Pouria Savadkouei | 2026-05-28 09:31:39


VIEW MORE