I'm not having much luck getting a replacement flexplate for a straight up Gen3 to 4L80E, the stock flexplate is broke. I'm running a 10.5" freakshow converter which uses a 3 bolt mount.

I have ordered a SFI unti from TCI but the frigging thing keeps getting delayed and I'm going to cancel if I can find a suitable replacement which Summit said they do not have!
https://www.summitracing.com/parts/tci-399754

I don't NEED the SFI rating but always nice to have, the Gen 3 engine is turbo'd so I would like a stronger than stock unit if possible but at this point I'm considering throwing anything in there!

Anybody have recommendations on a decent replacement for this setup? Really sick of waiting.

 

and this is why I can't have nice things both the FP's below have descriptions which make me wonder if they fit

This says LS but mentions PG and TH converters?
https://sdparts.com/i-21033980-hays-...%7Cyear%3D2005

This one requires spacers and bolts?
https://www.speedwaymotors.com/Chevr...80,395626.html

 

Call WS6store or Texas Speed and Performance, they should may able to hook you up.

 

Would this work? https://www.ebay.com/itm/CAT-RACING-...YAAOSwKRBbFaEF


this is the flexplate i'm using. No complaints. its thicker than stock for sure

 

I don't think so, pretty sure I need the 11.5 converter bolt pattern.

I was waiting on getting the FP before I took the tranny out, maybe I'll get that done tonight and measure up the converter, it might have provisions for an 11"+ mount pattern. But then again I just want to order as much improved stock replacement as I can get so I remember what I need to order when **** breaks. This is in a '74 C10 that already have a variety of parts from other doner years which I should write down!

 

it has 2 or three bolt patterns......

btw, fwiw, I read several instances where people had issues (don’t remember what) with the tci flexplate.

 

i used prw ​​​​​​1834620 and its got 3-4 bolt circle diameters on it. you might need a snout extender thing though. I did.

 

LOL!

I never have had an experience where obtaining a Flex-Plate was soooo difficult... LOL!

If worse comes to worse on a project... having a torque-converter made can be an easy solution to less common engine to transmission pairings.

Good Luck!

 

A very common issue with 4L80E Flexplates is wear in the Crank Adapter/Spacer where the converter pilots, This (In my opinion) leads to broken flexplates. If you have to reuse the existing adaptor.....Check it real well for wear!

This complete kit is in stock at the Arlington, Texas Summit Racing warehouse.......https://www.summitracing.com/parts/b...BoCwqsQAvD_BwE

 

Are you using that with a 4L80?

 

I don't have a spacer/adaptor It's a stock gen3 (4.8) to 4L80E pairing. and the converter/crank pilot is TIGHT! first time I dropped the tranny out I had to work at it and getting it back in wasn't a treat

 

Purchased a TCI flex plate through JEGS about three weeks ago and I'm still waiting.

 

Was this paired to a 4L80? If so was the adaptor to space out the FP AND snug the FP to the converter snout? Looks like the FP is dished, the stock one I have isn't.

 

4.8/80e combo yes it has some dish. the part i used was more a pilot extender than flywheel spacer. call summit, they have them and they are mostly decent on the phone

 

Got it, so something like this versus a spacer, thanks!
https://www.summitracing.com/parts/s...4/applications

I'll still give them a call once I drop the tranny and measure the snout... maybe tonight if it cools off a little bit.

 

Okay.....That's not how GM piloted the 4L80E converter on LSx engines.(Except '99 & '00 extended crank LQ4's) which basically had the spacer incorporated in the crankshaft.
Being a 4.8L doesn't mean anything to me as Savanna/Express 2500/2500 vans had 4.8L's & 5.3L's paired with 4L80E's & used the SAME adapter & flat flexplate the '01 & up LQ4 used.

I can't believe people use aftermarket pilot extensions when the correct OE stuff is readily available. Or just simply have a extended pilot converter built for a dished 4L60E/6L80E flexplate.

 

Right, I’d really like to get the right flat FP and not deal with a spacer or adaptor but I’m having a hell of a time finding the right FP that has the right converter mounting pattern and is a bit stouter than stock. Nothing is ever simple.

never got under the truck last night, decided working on my 25 year old mut of a bike was going to yield a lot more results.

https://photos.app.goo.gl/SKLgyGRtmozMVVi37



[img]blob:https://ls1tech.com/6967da6b-2d8b-4def-b614-b85a82143181[/img]

 

So you have a dished flexplate & extended pilot converter??? And a 11.5" bolt circle/pattern???

 

There's no issues running a flexplate spacer, plenty of people do it, so not sure why you're so against it.

If you're looking to go the cheap route, you can get an ATP Z-270 off Amazon for like $60. It's a flat flexplate that includes the extension. Or you can call a company like FTI and they can hook you up I'm sure with something decent.

FWIW I have a long crank lq4 and custom built 4l80e bolt pattern converter and run a flat SFI JW flexplate that has both a standard ls bolt pattern and 11.5" 80e pattern. You'd need to get a spacer since it's not included. Part number is 564-93019-LSC.

 

I'm with Clinebarger that the pilot extensions are the cheap&lazy man's "solution" and a bad idea. I recall posts here where they caused mysterious rattling sounds. A $60 kit consisting of the spacer and 6 longer bolts and you have duplicated GM's proven method.