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

4+3 re-visited

Thread Tools
 
Search this Thread
 
Old Nov 2, 2003 | 11:21 AM
  #1  
Gearheadotaku's Avatar
Gearheadotaku
Thread Starter
Racer
15 Year Member
 
Joined: Aug 2003
Posts: 296
Likes: 2
From: Commerce, MI
Default 4+3 re-visited


I have wrestled the O/D unit out from under my '88 in prep for it's rebuilding. There is a plastic tube about 3 inches tall bolted to the right side of the "pan". It stands straight up and has nothing in it, it's open right into the unit with a 3/8 (roughly) opening. Previous owner has plugged it up w/ silicone. I asked about this before and was told it was a vent and should remain open. I found a vent atop the tail houseing with a hose attached. Could there have been some confusion as to what we were discussing before? :confused:
Jeff
Reply
Old Nov 2, 2003 | 11:25 AM
  #2  
scorp508's Avatar
scorp508
Team Owner
Supporting Lifetime Gold
25 Year Member
Liked
Loved
Community Favorite
 
Joined: Mar 2000
Posts: 83,383
Likes: 87
From: Boston, MA
Default Re: 4+3 re-visited (Gearheadotaku)

Thats wierd sounding. The only thing that should be there is the vent tube on the top of the tailhousing that vents up into the engine compartment and then also another vent on top of the 4-speed part.
Reply
Old Nov 2, 2003 | 12:06 PM
  #3  
Gearheadotaku's Avatar
Gearheadotaku
Thread Starter
Racer
15 Year Member
 
Joined: Aug 2003
Posts: 296
Likes: 2
From: Commerce, MI
Default Re: 4+3 re-visited (scorp508)

Yeah, I found that stuff, but this thing is different. I will try to borrow a digital camera and post a pic, but don't hold your breath. I'm techno-impaired.
Jeff
Reply
Old Nov 2, 2003 | 01:59 PM
  #4  
Gearheadotaku's Avatar
Gearheadotaku
Thread Starter
Racer
15 Year Member
 
Joined: Aug 2003
Posts: 296
Likes: 2
From: Commerce, MI
Default Re: 4+3 re-visited (scorp508)

OK, cross your fingers. These should be some pics of the part in question. Feel like :_dupe: having to ask for help here, but no-one seems to know.

Jeff


OK, that didn't work. How do you post pic's?


[Modified by Gearheadotaku, 2:05 PM 11/2/2003]
Reply
Old Nov 2, 2003 | 06:16 PM
  #5  
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 Re: 4+3 re-visited (Gearheadotaku)

Put the url of your pics between the [IMG] tags.

There's a throttle valve cable on this side, but I don't know of anything else. Perhaps the previous owner put in a tranny temp sensor and plugged it back up.

awaiting pics... :lurk:
Reply
Old Nov 2, 2003 | 07:45 PM
  #6  
frank moran's Avatar
frank moran
Racer
 
Joined: Mar 2001
Posts: 269
Likes: 1
From: woodstock, Ga
Default Re: 4+3 re-visited (Gearheadotaku)

is it possible this was where a throttle valve cable once was?? my 85 has the cable on the right side.. did later model yrs not have the cable and you have an older OD unit?
frank
Reply
Old Nov 2, 2003 | 09:41 PM
  #7  
BillWelter's Avatar
BillWelter
Instructor
 
Joined: Jul 2003
Posts: 114
Likes: 0
From: Colorado Springs CO
Default Re: 4+3 re-visited (Gearheadotaku)

There's a vent tube attached to the pan? The small pan that goes on the bottom of the OD unit? Does it look factory? I've never seen that before, sounds almost like someone added a filler tube to it...Hmmm..
Reply
Old Nov 2, 2003 | 09:42 PM
  #8  
Gearheadotaku's Avatar
Gearheadotaku
Thread Starter
Racer
15 Year Member
 
Joined: Aug 2003
Posts: 296
Likes: 2
From: Commerce, MI
Default Re: 4+3 re-visited (CentralCoaster)

URL??

Way over my head. I do nuts and bolts, not bit's and Byte's. I sent you some pics via e-mail. At least I figured that out.

Thanks

Jeff
Reply
Corvette Stories

The Best of Corvette for Corvette Enthusiasts

story-0

Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

 Michael S. Palmer
story-1

Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

 Joe Kucinski
story-2

150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

 Joe Kucinski
story-3

8 Coolest Corvette Pace Cars (and Replicas) of All Time

 Verdad Gallardo
story-4

Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)

 Joe Kucinski
story-5

Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!

 Verdad Gallardo
story-6

Top 10 Corvettes Coming to Mecum Indy 2026!

 Brett Foote
story-7

Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!

 Michael S. Palmer
story-8

10 Revolutionary 'Corvette Firsts' Most People Don't Know

 Joe Kucinski
story-9

5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2

 Michael S. Palmer
Old Nov 3, 2003 | 02:32 AM
  #9  
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 Re: 4+3 re-visited (Gearheadotaku)

I sent you some pics via e-mail. At least I figured that out.
Yes, that's the throttle valve cable connection. I'm baffled though. The '88 didn't come with a TV cable, but I'm not sure if the 4+3s had provisions for it anyways.

Perhaps you have an older overdrive unit on your '88. But, then my next question would be... will an older overdrive (w/ TV cable) function properly on a newer 4+3 car without the TV cable on the throttle linkage?

Scorp, does your '87 have the TV cable? If not, what do you have on the passenger side of your overdrive unit where the TV cable would go?
Reply
Old Nov 3, 2003 | 07:30 AM
  #10  
Gearheadotaku's Avatar
Gearheadotaku
Thread Starter
Racer
15 Year Member
 
Joined: Aug 2003
Posts: 296
Likes: 2
From: Commerce, MI
Default Re: 4+3 re-visited (CentralCoaster)

It seems possoble that I could have an older O/D unit under here. There is a lot of non-OEM rtv on things, its been apart once before. Anyone else have any thoughts as to an old O/D will work on a later car? :banghead:

Thanks, Jeff
Reply
Old Nov 9, 2003 | 08:47 PM
  #11  
RonJ's Avatar
RonJ
Burning Brakes
15 Year Member
 
Joined: Oct 2003
Posts: 1,106
Likes: 1
From: Foresters Falls(near Ottawa) Ont
Default Re: 4+3 re-visited (Gearheadotaku)

A question about the 4+3, my 85 uses a TV cable, does the cable determine when the o/d will kick out under acceleration or is that ECM controlled??

Thanks!!! :confused:
Reply
Old Nov 9, 2003 | 08:52 PM
  #12  
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 Re: 4+3 re-visited (RonJ)

A question about the 4+3, my 85 uses a TV cable, does the cable determine when the o/d will kick out under acceleration or is that ECM controlled??

Thanks!!! :confused:
The TV cable controls the kickdown, at least in part, on the older units. I suppose this was eliminated since the TPS already knows the throttle level right?

:lurk:
Reply

Get notified of new replies

To 4+3 re-visited





All times are GMT -4. The time now is 04:45 AM.

story-0
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

Slideshow: How to Protect A Convertible Top: 10 DOs & DON'Ts

By Michael S. Palmer | 2026-04-03 00:00:00


VIEW MORE
story-1
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

Slideshow: The 10 most explosive Corvettes ever built based on power-to-weight ratio.

By Joe Kucinski | 2026-05-20 07:23:03


VIEW MORE
story-2
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

Slideshow: From C1 to C8 we compare every Corvette generation by the numbers.

By Joe Kucinski | 2026-05-12 16:54:12


VIEW MORE
story-3
8 Coolest Corvette Pace Cars (and Replicas) of All Time

Slideshow: Some Corvette pace cars became collectible legends, while others perfectly captured the look and attitude of their era.

By Verdad Gallardo | 2026-05-11 09:50:51


VIEW MORE
story-4
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)

Slideshow: Ranking the top 10 Corvette engines by torque output.

By Joe Kucinski | 2026-05-05 11:58:09


VIEW MORE
story-5
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!

Slideshow: A Corvette pace car nearly matching IndyCar speeds sounds exaggerated, until you look at the numbers.

By Verdad Gallardo | 2026-05-04 20:03:36


VIEW MORE
story-6
Top 10 Corvettes Coming to Mecum Indy 2026!

Among a rather large group of them.

By Brett Foote | 2026-05-04 13:56:44


VIEW MORE
story-7
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!

Slideshow: the top 10 things Corvette owners want in the C9 Corvette

By Michael S. Palmer | 2026-04-30 12:41:15


VIEW MORE
story-8
10 Revolutionary 'Corvette Firsts' Most People Don't Know

Slideshow: 10 Important Corvette 'firsts' that every fan should know.

By Joe Kucinski | 2026-04-29 17:02:16


VIEW MORE
story-9
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2

Slideshow: Should you buy a 2020-2026 Corvette or wait for 2027?

By Michael S. Palmer | 2026-04-22 10:08:58


VIEW MORE