White.Lightning

iTrader: (53)

Hey guys. I read in the sticky that you can use a TCI LS1 flexplate for this swap. I purchased a used TCI flexplate a while ago to use on a TH400 swap that never happened. It is the TCI-399753

TCI flexplate link

Can this flexplate be used for the M6 to 4L80e swap? I am assuming that a converter from Yank, Vigilante or Circle-D that was specifically designed for this swap would work?

Let me know what you guys think. If it won't work, I will sell the one I have and buy a stock flexplate from an A4 car.

Thanks,
Andy

White.Lightning

iTrader: (53)

Anyone???

Yank

iTrader: (181)

The bolt pattern is too small on the TCI flexplate for the stock 4L80-E converter but a custom converter will work for you.

White.Lightning

iTrader: (53)

So the converters you sell for the 4L80e in our cars will not work? If not, should I just sell this flexplate and purchase a stock flexplate? The only reason I was asking is because I have this one already and wondered if I could use it.

Thanks

Circle-D

iTrader: (21)

Yank is correct. You would need a special LS1/4L80 converter.

TCI also makes a flex-plate for you setup, then you could use a 6 lug 4L80 billet converter and get the ultimate strength.

Here is the link:

http://www.compperformancegroupstore...ct_Code=399754

Chris

Circle-D

iTrader: (21)

Yes you can use it, just need a combo converter.

Chris

White.Lightning

iTrader: (53)

What does a combo converter cost? What would you all recommend? Use this flexplate or get the other TCI one or a stocker? Trying to find the most cost effective way of doing this.

Circle-D

iTrader: (21)

My combo converter is the same price. So that would be the most economical way. The only problem is that it will only fit a LS style with a 4L80. But they are getting more and more common. So resale value would be good as well. The only benefit from getting the 4L80 style would be so you an use all 6 lugs for better strength. But with the SFI and 3 lugs I am sure you are good for 1000+ hp.

Chris

White.Lightning

iTrader: (53)

Well then I might as well hang onto this flexplate and get a combo converter from someone like yourself then. I'm sure the SFI TCI flexplate I have is a lot stronger than stock, and I don't have to spend any more money.

I still have time to consider this. I might ponder selling my TCI flexplate to fund the 4L80 TCI flexplate to gain the strength. But like you said, the three lug should be more than enough for my application.

Thanks

FLT

iTrader: (1)

This question is for Dave and Chris. With a billet front cover that basically has two different bolt patterns, can guys use all six bolt holes? Personally if so I think this is a no brainer if the flywheel has two different bolt patterns and it fits. Just a thought from a trans builder. Vince B

Circle-D

iTrader: (21)

Vince,

Good idea. I agree. I have had a few request for this and plan on making one soon. It would have a LS1 BP and an LT1/TH350 BP. Allow you to take advantage of all 6 on the TCI dual bolt pattern flex-plate. But GM does have 3 different BPs. Easy enough to make, just a slight modification on the CNC.

350/LT1 -10.750"
LS1 - 11.080"
400/4L80 - 11.500"

So it does depend on what dual pattern flex-plate you are using. For most the LS1/LT1 combo is the best.

Chris

White.Lightning

iTrader: (53)

So are we talking about the TCI flexplate I currently have TCI-399753?

Circle-D

iTrader: (21)

Yes, That TCI flex-plate should have the dual bolt pattern.

You can measure it and see 2 different bolt circles. Not a huge difference though.

11.080" - LS1
10.750" - LT1/350

Chris

Circle-D

iTrader: (21)

I found this on another website - notice the last line......

TCI SFI Approved LS1 Flexplate.

Race safely with TCI's newest addition to our extensive flexplate line. The TCI 399753 flexplate fits 1998 and newer F-bodies with LS1 engine as well as ’99 and newer GM trucks with 4.8L, 5.3L and 6.0L LS based engines.

Notes:
SFI 29.1 approved
Lightweight design for quick engine response
Made in the USA from plasma-cut, Blanchard-ground, billet steel plate
Includes mounting hardware
Dual bolt patterns, stock LS1 and small GM bolt pattern

Chris

White.Lightning

iTrader: (53)

I just measured and got something different than that. One set of holes is measuring 9.750" and another set is measuring 9.4375" (7/16"). This is going from edge of hole to edge of hole- center to center was more of a guessing game.

I'm not sure what's wrong

Yank

iTrader: (181)

All the LS based 4l80-e conversion converters we build have the correct bolt pattern.
unless it is for a truck to fit the OEM pattern

White.Lightning

iTrader: (53)

Does your converter work with my TCI-399753 flexplate?

White.Lightning

iTrader: (53)

Pardon my paint skillz but this is what my flexplate is showing:

Yank

iTrader: (181)

Yes it does and if you go for the PY series all 6 bolts can be used.

White.Lightning

iTrader: (53)

Perfect! I am glad I do not have to purchase another one. When the time comes later this year, I will be in touch.

Thanks!