brandonppr

iTrader: (9)

98 A4 yank converter stock flexplate LS1

I blew my engine and picked up another.
I was installing the new engine and normally I have been having to put a washer between the flexplate and the converter, but now they are so tight the engine will not even rotate.

What could be wrong?

01ssreda4

iTrader: (96)

Its not engaged in the transmission all the way.

mrvedit

Which means you likely damaged/cracked the pump rotor in the trans.

AutomagicLS1

iTrader: (18)

converter isn't engaged into the pump all the way lower trans back out and try again. you should hear and feel 3 clunks if the converter is all the way in

jakeshoe

iTrader: (14)

3 clunks is a myth. MEASURE it. Should be in the trans 1" or slightly more.

mrvedit

EXACTLY. Ideal is 1-1/8". Anything less than 1" indicates the converter is not fully seated.

wht/73

Is this from the mounting surface of the trans to the mounting pad on the converter?
Is this for every GM trans?
What should a 4l80e be?
Thanks

mrvedit

Yes, you can put a straight edge over the bell housing and measure the distance down to the mounting pad on the converter.
It is pretty much the same for most GM transmissions including 4L80E, might be 1/16" different for some, but very close to 1-1/8".

silvershark

Here is a good article. I haven't done one, but this is a great how to.

http://modernmusclecars.net/forums/a...p?do=tcinstall

brandonppr

iTrader: (9)

Well I think I found the problem. I pulled it back out and I guess I did not tighten down the flexplate bolts. I can't believe I did that. The converter was all the way in as far as I can tell. Do you think it did any damage?

wht/73

So this measurement is for making sure that the converter is seated.
Then once the trans is bolted up to the engine the converter gets slid right up to the flex plate . Correct?

jakeshoe

iTrader: (14)

You measure the converter installed into the transmission.
Then you measure the distance from the converter to flexplate, with the transmission installed and converter all the way in the transmission.

I have videos online that detail this but can't post here.

wht/73

Thank you!
I'll Check it out.

01ssreda4

iTrader: (96)

Big thread up top of this section that talks about converter engagement and flexplate gap.

jhshnh

Had the same problem with my FTI converter and new 4l60e. The o-ring or seal on the input shaft was oversized and the converter wouldn't seat. I had the converter and flexplate right on each other. So i replaced the o-ring with a stock one and the got more than 1" of clearance between converter and flexplate.