LS to 4l80e flexplate and TC installation help

[64nailhead]

That’s the measurement I was worried about. I’m going to be running a circle d TC

Do you know how to measure for proper clearance? There is tutorial on Circle D’s website about how to do it as well.

But it can be done on the ground implying engine on a hoist and transmission on a jack. Also, get ready for the 4l80 ‘click, click, boom’ converter install - I HATE having to do that under the car while laying in my back.

Edit : there is a chance that Circle D made the converter crank pilot the correct length if you told them exactly what your application is. If you call them with the converter serial number then they will be able to tell you how it was made.

 

[64nailhead]

This is a .125” spacer from ICT billet. Need it for a 200-4R attached to an LS (6.0)

 

[Built6spdMCSS]

This is a .125” spacer from ICT billet. Need it for a 200-4R attached to an LS (6.0) View attachment 219940

Why? Bolted several up with stock GM Parts with no issue.

 

[64nailhead]

Why? Bolted several up with stock GM Parts with no issue.

For proper converter clearance.

 

[Built6spdMCSS]

Whatever works I guess...we just used the stock GM 4L60E LS Flexplate and a 4L80E Spacer on the back.

 

[johnnunez29]

OK, seeing how that flexplate is made with some really thick bosses around the holes, that is the pilot spacer.

Basically you bolt the flexplate on the back of the crank and put that spacer in the middle and the converter pilot sits in that.

Yes. That’s exactly what I did. Builder seems to have messed up a bolt hole a little gonna have to tap it out a bit. Anyways, this is what I have. Should there be a specific space between the FP and the engine? Also between the TC and the trans? Thanks again 💪🏼

 

[Built6spdMCSS]

TC and Trans a couple of us already said..

 

[johnnunez29]

You just need to measure to insure you have an 1/8-3/16 of clearance between the converter and flexplate.

I went through this and Built6spdMCSS helped me with it. I made much more of it than was needed. You might have to space the flexplate away from the crank or put a spacer between the engine and trans. Once I discovered the engine to trans spacer, all was resolved in my scenario.

I’d strongly recommend measuring before the engine is in the car.

Edit - forgot to ask - what converter are you using (who did you get it from)?

Excuse the dumb question. Does the FP bolt on to the TC? Or am I looking for a measurement between the FP and the engine?

 

[Built6spdMCSS]

Excuse the dumb question. Does the FP bolt on to the TC? Or am I looking for a measurement between the FP and the engine?

Why would there be bolt holes there then.....🤦‍♂️

I'm going to quote my own post...

If yours was built for a 4L80E in an LS Engine application it will need the flat Flexplate, and fully seated Convertor will be about 3/16" from the Flexplate when installed and spin freely.

So at this point, if you can't derive that this measurement is a check measurement to make sure everything is installed correctly BEFORE you install the bolts bolting up the Converter to the Flexplate.. you should probably have someone else build your car.

I'm done helping, I don't know how many times I can explain the same thing.

 

[johnnunez29]

Why would there be bolt holes there then.....🤦‍♂️

I'm going to quote my own post...

So at this point, if you can't derive that this measurement is a check measurement to make sure everything is installed correctly BEFORE you install the bolts bolting up the Converter to the Flexplate.. you should probably have someone else build your car.

I'm done helping, I don't know how many times I can explain the same thing.

maybe im misunderstanding or im just not explaining correctly. Obviously the flaex plate goes there, what i mean is should i be looking for a specific measurement from the flax plate to the tip of the block? basically to see if i need to SHIM the flexplate. Ive gotten this far, im building the rest myself. Thanks for your help.