C3 Tech/Performance V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette
Sponsored by:
Sponsored by:

T56 wont mate LS3

Thread Tools
 
Search this Thread
 
Old Sep 23, 2015 | 04:42 PM
  #1  
C3-69er's Avatar
C3-69er
Thread Starter
Intermediate
 
Joined: Jul 2011
Posts: 27
Likes: 4
Default T56 wont mate LS3

Hi,
Bought an LS3 (525hp) +T56 Magnum combo connect and cruise package. But it wont connect😁
Clutch shaft fits pilot bearing nice and goes all the way in if I dont have the bellhousing in between. With bellhousing it just wont go. Any ideas?

I used the transmission/clutch shaft to center clutch as I didn't have the align tool in hand. I think it should do the job. Been unbolting the clutch 4-5 times and centering it this way every time. It seems that if I put the bellhouse in the transmission does not go in straight?





Reply
Old Sep 23, 2015 | 05:22 PM
  #2  
74modified's Avatar
74modified
Burning Brakes
 
Joined: Oct 2008
Posts: 1,037
Likes: 14
From: Mobile Alabama
Default

I used a alignment tool on mine - and no problem. I picked it up online for ~$5.00. If the shaft is hitting the pilot bearing with the bell housing on, either the clutch is off a little or the bell housing is bad. Are you bottoming out like the shaft is too long?
As an aside, I recommend adding a remote bleeder before you put it in - much easier to bleed.
Reply
Old Sep 23, 2015 | 05:52 PM
  #3  
Gordonm's Avatar
Gordonm
Race Director
25 Year Member
Liked
Loved
Community Favorite
 
Joined: Dec 1999
Posts: 19,610
Likes: 778
From: Forked River NJ
Default

My T56 from an 06 GTO bolted to my LS3 with no issues at all. I have an old input shaft from a Muncie that I use to align clutches. Never has failed me yet. As for the remote bleeder I agree 100 percent. I have a speed bleeder on a long braided line for bleeding it. I can pump the clutch pedal while holding the speed bleeder in my hand. Works great.
Reply
Old Sep 23, 2015 | 06:22 PM
  #4  
tt 383's Avatar
tt 383
Racer
15 Year Member
Liked
Loved
Community Favorite
 
Joined: Oct 2006
Posts: 435
Likes: 18
From: Florida
Default

Do they need indexed like the TKO units?
Reply
Old Sep 24, 2015 | 01:28 AM
  #5  
C3-69er's Avatar
C3-69er
Thread Starter
Intermediate
 
Joined: Jul 2011
Posts: 27
Likes: 4
Default

Alignement tools is on its way, ordered one. My guess is that clutch just isn't centered.

I've had the clutch bolts on and off and torqued to the epcs several times now. Any issue with that? Should the bolts be replaced at some stage?
Reply
Old Sep 24, 2015 | 11:58 AM
  #6  
ignatz's Avatar
ignatz
Safety Car
Supporting Member
20 Year Member
Liked
Loved
Community Favorite
 
Joined: May 2004
Posts: 4,352
Likes: 1,579
From: los altos hills california
Default

Could just be the clutch but to do the job right you want dowel pins in the flywheel aligning the pressure plate (Ahh I see them in the picture, nice!) and an indexing check on the bell housing with a dial indicator to determine that it is really centered. You can get offset dowels for the motor to move the bell housing around a bit and fix anything that is off center.

The plastic alignment tools don't work very well. Usually I use the tool to get close and then push the clutch pedal in and the transmission slides right in, all else being good. That's of course in the car.

You won't want to do this job again from under the car after discovering a vibration. I had a picture around here somewhere about how to do the bell housing indexing but can't find it. I'm sure there's lots of these. I attached my indicator with some very strong magnets to the flywheel
Reply
Old Sep 24, 2015 | 01:48 PM
  #7  
C3-69er's Avatar
C3-69er
Thread Starter
Intermediate
 
Joined: Jul 2011
Posts: 27
Likes: 4
Default

This should be a bolt on package. It says in the instructions that if you're using all these brand new parts bellhousing should be centered and no need for routine measurement.

Measuring if bellhousing is centered sounds like a thing to if alignement tool don't make them mate.

I just dont understand how offset dowel pins can change the position of bellhousing as the bolts are rather tight and remain in the same position.
Reply
Old Sep 24, 2015 | 02:14 PM
  #8  
Rick@RKT Performance's Avatar
Rick@RKT Performance
Supporting Vendor
15 Year Member
Conversation Starter
All Eyes On Me
 
Joined: Apr 2011
Posts: 3,332
Likes: 195
From: Frederick Maryland
St. Jude Donor '08-'09-'10-'11-'12, '14-'15-'16-'17-'18
Default

The crate LS3 will come with big pilot bearing. If you're using T56 bell housing, you'll need the small pilot bearing. Check to see which one you have and replace it with small bearing and you should be good.

The small bearing is for 97-04 C5.

__________________
Reply
Corvette Stories

The Best of Corvette for Corvette Enthusiasts

story-0

8 Most "Only Corvette Owners Understand" Quirks and Problems

 Pouria Savadkouei
story-1

10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years

 Joe Kucinski
story-2

How Much Horsepower Every Corvette Engine "LOST" in 1972

 Joe Kucinski
story-3

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

 Michael S. Palmer
story-4

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

 Joe Kucinski
story-5

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

 Joe Kucinski
story-6

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

 Verdad Gallardo
story-7

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

 Joe Kucinski
story-8

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

 Verdad Gallardo
story-9

Top 10 Corvettes Coming to Mecum Indy 2026!

 Brett Foote
Old Sep 24, 2015 | 02:44 PM
  #9  
C3-69er's Avatar
C3-69er
Thread Starter
Intermediate
 
Joined: Jul 2011
Posts: 27
Likes: 4
Default

I have the small one on the left. I prefitted it to the clutch shaft before installation and it fit perfectly.
Reply
Old Sep 24, 2015 | 02:57 PM
  #10  
Rick@RKT Performance's Avatar
Rick@RKT Performance
Supporting Vendor
15 Year Member
Conversation Starter
All Eyes On Me
 
Joined: Apr 2011
Posts: 3,332
Likes: 195
From: Frederick Maryland
St. Jude Donor '08-'09-'10-'11-'12, '14-'15-'16-'17-'18
Default

Originally Posted by C3-69er
I have the small one on the left. I prefitted it to the clutch shaft before installation and it fit perfectly.
Then I would say it would be the alignment.
Reply
Old Sep 24, 2015 | 06:44 PM
  #11  
Gordonm's Avatar
Gordonm
Race Director
25 Year Member
Liked
Loved
Community Favorite
 
Joined: Dec 1999
Posts: 19,610
Likes: 778
From: Forked River NJ
Default

My clutch alignment tool

Reply
Old Sep 25, 2015 | 07:12 AM
  #12  
derekderek's Avatar
derekderek
Race Director
 
Joined: Jul 2015
Posts: 13,082
Likes: 3,399
From: SW Florida.
Default

i take it there is no access to the 6 pressure plate bolts once trans is installed? the old way was to leave clutch loose and tighten once trans aligned the clutch. you might wanna try a test fit with clutch loose, or maybe without disk even in place to see if it is something else messing with you.
Reply
Old Sep 25, 2015 | 08:23 AM
  #13  
Gordonm's Avatar
Gordonm
Race Director
25 Year Member
Liked
Loved
Community Favorite
 
Joined: Dec 1999
Posts: 19,610
Likes: 778
From: Forked River NJ
Default

Originally Posted by derekderek
i take it there is no access to the 6 pressure plate bolts once trans is installed? the old way was to leave clutch loose and tighten once trans aligned the clutch. you might wanna try a test fit with clutch loose, or maybe without disk even in place to see if it is something else messing with you.
It's not the trans that is the problem it is the bell housing. You have no access to the PP bolts once the bell housing is installed. I don't see even on a GEN1 motor how you have access to the PP bolts once the bell housing is installed.
Reply
Old Sep 25, 2015 | 09:38 AM
  #14  
GUSTO14's Avatar
GUSTO14
Le Mans Master
20 Year Member
Liked
Loved
Community Favorite
 
Joined: Sep 2003
Posts: 8,812
Likes: 2,029
From: eastern NC
Default

Originally Posted by Gordonm
It's not the trans that is the problem it is the bell housing. You have no access to the PP bolts once the bell housing is installed. I don't see even on a GEN1 motor how you have access to the PP bolts once the bell housing is installed.
Com'on Gordon, you're old enough to remember these...




GUSTO
Reply
Old Sep 25, 2015 | 09:42 AM
  #15  
derekderek's Avatar
derekderek
Race Director
 
Joined: Jul 2015
Posts: 13,082
Likes: 3,399
From: SW Florida.
Default

I think he meant gen 1 LS, not gen 1 small block.
Reply
Old Sep 25, 2015 | 10:01 AM
  #16  
Gordonm's Avatar
Gordonm
Race Director
25 Year Member
Liked
Loved
Community Favorite
 
Joined: Dec 1999
Posts: 19,610
Likes: 778
From: Forked River NJ
Default

Yes I do remember those form years ago, and yes those would be able to get the PP bolts no problem.

I did mean the Gen1 SB not the LS. With the bellhousing on how would you get to the PP bolts? Unless you "windowed" the bellhousing I don't see it possible to get to them.
Reply
Old Sep 25, 2015 | 10:09 AM
  #17  
Gordonm's Avatar
Gordonm
Race Director
25 Year Member
Liked
Loved
Community Favorite
 
Joined: Dec 1999
Posts: 19,610
Likes: 778
From: Forked River NJ
Default

Not that this is going to answer any of your questions but this is my setup with a Quick Time Blow shield bellhousing and the large bearing in the LS3 crank shaft.







I also cut the botton flange on the bellhousing for a little more streamlined and ground clearance. Its even with the bottom of theoil pan.

Reply

Get notified of new replies

To T56 wont mate LS3

Old Sep 25, 2015 | 01:12 PM
  #18  
derekderek's Avatar
derekderek
Race Director
 
Joined: Jul 2015
Posts: 13,082
Likes: 3,399
From: SW Florida.
Default

So put the trans in with clutch loose. If it doesnt go, you know there is a clearance issue somewhere, not a disk alignment issue.Put driveshaft yoke in and see if it spins. Then gently remove trans and bell hsng and tighten clutch.
Reply
Old Aug 16, 2016 | 02:17 AM
  #19  
Collin Chapman's Avatar
Collin Chapman
1st Gear
 
Joined: Aug 2016
Posts: 1
Likes: 0
Default Similar issue

Did you ever find a solution for this?
Reply
Old Aug 16, 2016 | 05:55 AM
  #20  
C3-69er's Avatar
C3-69er
Thread Starter
Intermediate
 
Joined: Jul 2011
Posts: 27
Likes: 4
Default

Yes! With the cheap plastic alignement tool it went right in👍
Reply



All times are GMT -4. The time now is 02:09 PM.

story-0
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
story-1
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years

Slideshow: 10 reasons why the C6 Z06 is still a performance benchmark after 20 years.

By Joe Kucinski | 2026-05-27 17:20:09


VIEW MORE
story-2
How Much Horsepower Every Corvette Engine "LOST" in 1972

Slideshow: How much horsepower every Corvette engine lost in 1972.

By Joe Kucinski | 2026-05-27 16:54:53


VIEW MORE
story-3
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-4
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-5
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-6
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-7
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-8
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-9
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