ChevyGoldfinger

Just a few words of warning/caution. . . When you install one of these SFI flexplates, (mine is the TCI) be sure to use loctite and carefully torque to specs. Mine first one was never torqued properly and had no loctite on the bolts. It was a disaster when it got loose while on a full out WOT pull on the dyno. Damaged many parts in the motor, as well as the converter.

Use high quality bolts, (ARP) torque them properly and loctite the hell outta them!!

SLP 02 SS

Actually GM finally disclosed information that they had the
wrong Flexplate Torque Spec for the 2000-2002 GM vehicles.
This is what was causing the damage to the Flexplate.
However, I don't think they ever came out with a "Recall" on it.

I didn't find this out until after I tore up the Flexplate, Converter, and
had to get a Total Tranny Rebuild. I still have the Cracked Flexplate.
Cracked at ALL 3 Bolt holes connecting it to the Converter.

MetallicBluews6

iTrader: (2)

Get a TCI heavy duty flexplate. Thats what I did.

SLP 02 SS

Yeah, I've ordered one as well. The "SFI" TCI Flexplate $200.00
Figured that while I have the motor out I might as well.

daddykamp

Ive got a 94 camaro to a 97 corvette ls1 swap and ive got a cracked flywheel...the place that found it told me it was because my flywheel had been modified to work with the 4l60e tranny...is there a flywheel that wouldnt need to be modified?

Holeshotz

iTrader: (1)

Mine was cracked at all 3 converter bolt holes. it cracked from the starter gear in towards the bolt holes. Luckily I found it before it caused any damage, TCI SFI going in the car now. Anyone know the torque spec for the bolts?

SLP 02 SS

The Flex Plate (Flywheel) to Converter is 90 Ft.Lbs.
The Flex Plate to Crank is 74 Ft.Lbs.

Make sure to use the RED Locktite
I would also advise to use ARP Bolts.
Good call on the TCI SFI.

I too had the same problem with the Flexplate cracking at ALL 3 Bolt Holes.
From the Starter Gear towards the Bolt Holes.
GM has since then stipulated that they originally used too high of a Torque Spec
on these Bolts which caused numerous Flexplates to fail in this manner.

horist

never cracked my stocker... but after seeing DriveATransam's cracked (in 3 places) flexplate... I upgraded to an SFI Approved one while the trans was out.

Also you have no worries about cracking your flywheel the flexplate is what you need to be more worrieda bout hehe

01TAFlyer

iTrader: (4)

In another post someone said that there had been issues with getting yank converters to line up with the TCI flexplate, is that true? I have a 3-bolt yank ss-series that I will be installing with it, I don't want to run into problems.

What arp bolts would I get to go with the TCI flexplate? I assume it has 7/16in bolt holes, but what length?
http://www.sdpc2000.com/catalog/885/...heel-Bolts.htm

TIA

1QUIKWS6

iTrader: (61)

Yup, definitely was for me - but I wanted to use all (6) TC bolts - maybe if you only use (3) you'll have better luck. If you do a search on this issue - you'll find all the threads with the numerous complaints about this same issue - don't want to rehash them all here. I ended up selling the TCI without ever using it and going with ATI.

Some people grind the holes to get the bolts to fit - I personally wouldn't do that as the flexplates are highly balanced on accurate equipment after they are mfg. Anything you do to add/remove material will throw off the balance from the factory.

BTW, the holes in the TCI flexplate are 7/16" however, the tapped holes in the Yank verters are still the stock metric size (at least they were on my PY3600E). So you don't want to buy the ARP 7/16 bolts.

That was yet another reason I didn't want to use the TCI with my Yank - the bolts that did line up with the holes had a lot of slop since the metric bolts are 10mm (.3937") while the flexplate holes are .4375". You would think with that much slop in the holes that all the bolts would line up - but bolt circle and/or angles must be off considerably on the flexplate. Can't be the verter as all (6) bolts lined up fine with the ATI.

Good luck...

TXCAMSS

iTrader: (60)

You should not have any problem lining up the holes on a 3 bolt Yank converter. The bolt length you will need for the 3 converter bolt holes is 10x1.5-20mm long. I think the 22mm bolts will work also if you can find them. I found these grade 8 torque converter bolts at the local auto parts store and the were made by Dorman if that helps.

***Note- Be sure to grind All the powder coating coating off from every contact point. That means each bolt hole head mounting area and the entire patch where the crank will make contact. TCI is just starting to send them out with these areas uncoated already, but be sure to check before installation.****


Good luck!!

01TAFlyer

iTrader: (4)

The only place I even found the ATI listed is their own site for $294. What size bolt holes does it have? I could not find it listed on their site. There is a major price difference between the two, but the TCI having the bigger holes worries me.

I guess I got not only a ls6 intake, but a POS flexplate to make up for it, hehe.

01TAFlyer

iTrader: (4)

TTT, and also, I am not sure how much they go for, but what about putting in a 2000 flexplate instead. Or would that be pointless?

NHRAFORMULA00

iTrader: (2)

O1TAFLYER -i have a yank ss3600 and a TCI flexplate here in front of me waiting to be installed. The 3 bolt holes that you need to use line up perfectly. The flex plate is designed with 6 holes , 3 for a ls1. 3 for a small block chevy. it is a dual pattern flex plate. As far as the slop in the holes, i personally would not worry about it as my converter that is in my car was just as sloppy when i installed it 4 years ago on a stock flex plate.I have well over 500 passes down the track with the Yank converter, with no problems.The new converter and flex plate are for my sons 2002 z28.

NHRAFORMULA00

iTrader: (2)

1 Quickws6- the TCI flex plate has 6 mounting holes as it is designed as a dual pattern unit for use with a 3 hole 4l60e trans, or a 3 hole turbo 350-400 small block trans conversion converter.It is not designed for a 6 bolt converter.

MattZ28

iTrader: (4)

Cracked my '96. I now have a TCI SFI in.

Tonner

My 2004 LS1 flex plate cracked back when running a 2800 Hi stall, it cracked outward from the 3 mountong holes also cracking through the ringgear, I could hear the different noise at startup,
Luckily I was fitting a 3600 multiplate converter (to be locked up at wot) when I found the problem early enough,
just fitted a ls2 plate and all seems to be Ok
Cheers Tonner
Just changed to the TCI plate a while back but the LS2 held out ok with nearly 600 hp at the wheels.

1QUIKWS6

iTrader: (61)

What are the differensces between an LS2 flexplate and an LS1 that make them so much better? Are they even better than the earlier style (2000) flexplates for the LS1?

I'm sure they are not SFI Approved - have never heard of anyone using them as a performance alternative. Not doubting you - would just like to know so as to have (probably) a cheaper alternative to the aftermarket flexplates in the future...

Tonner

sposed to be stronger thats all ,,if they weigh heavier than its a power loss I suppose.

02NavyBlueZ

Mine has been replaced once already and Im getting the same noise on startup again which is what notified me the first time it cracked, so I guess im going on #2 Why cant GM just stick to what works! none of us would have had this f'in problem if they wouldnt have switched over to the lightened one, which im sure ended up saving them money

Now im debating whether or not to stick another stock one in or just bite the bullet and throw in a TCI. I may be selling the car soon so.......

OEM part #12563136 $86.23 Shipped - GMPARTSDIRECT.COM

TCI part #399753 $204.90 Shipped - LMPerformance.com