tgui

How much torque/hp are the stock 4l60e flexplates holding? Should I be looking to upgrade as I want 500-600 hp/tq at the crank? Can you suggest any good parts?

Turbo 5.3 is the goal.

I have to take my trans out, so figured now would be a good time to address this.

GMCtrk

iTrader: (27)

Get TCI and be done with it.

It's not worth having to pull the trans for the cost of the flexplate

03chevytruck

iTrader: (4)

Spend the extra $100 over the cheaper flexplates and get the TCI as GMCtrk suggested!!

Lil brother PI

What he said.... U are already there

tgui

I'm dumb and can't find the proper TCI part number for a 2002 Yukon 5.3, can someone help?

Perhaps this? Is there something cheaper? Ouch!

GMCtrk

iTrader: (27)

there are 2 version. 1 has the 3 bolt 4l60 pattern and the other is the 6 bolt 4l80 pattern. Depends what converter you are running.

tgui

I'm running a 4l60e mating converter in my 4l80e.

3 bolts is what I have.

03chevytruck

iTrader: (4)

Yes, Summit gives a better description.

TCI Machined Flexplates 399753 - Free Shipping on Orders Over $99 at Summit Racing

dirt track racer 81

iTrader: (45)

Had stock 60e flexplate in front of my 4l80e.. I hit it with a 350 shot behind a 465hp 370..

03chevytruck

iTrader: (4)

^ I knew someone was going to chime in with making serious power and never breaking the stock flexplate. It's just a chance that i'm not willing to take. That's all. Not saying that it will break but if your in the market for a factory upgrade, Do yourself a favor and just get the TCI.