my transmission is squeeling lq9/th400 swap

[jwang203]

I just swapped a lq9 into my 1990 chevy. I went with a msd 6010 and performer intake. I Bolted it to a th400. I have a dished flexplate. This was my personal transmission and was in great working order when pulled 2 years ago.
I used the gm flexplate adapter with the longer bolts and bolted it in this order
Engine block l flexplate l spacer l torque converter.

The transmission started squeeling within 10 seconds of initial startup. I topped the trans off with fluid and it quit. I only let it run for mabey 3 min. I finished hooking up other things like wiring and gauges, and the next day it started doing it again. It squeels in park and neutral but not in gear.



I have tried another new filter, wix this time, I put two o- rings on the intake tube, and made sure it was shoved up all the way. It still does it.

How much play should an unbolted torque converter have between the flexplate and converter when shoved all the way back? Im thinkin mabey converter isnt on the shaft far enough? Mabey my starter isn't shimmed correctly? Mabey a bad pump? Help!

[Carazy]

If you post a vid to youtube of the noise and link it to here I can help you narrow it down. Plus post a few pics of the converter pushed back from flywheel. Was the 400 operable before swap?

[jwang203]

http://ls1tech.com/forums/general-ma...on-squeal.html

Im pretty sure i figured it out. I found this post on vacuum lines. I had mine hooked up wrong!

[Carazy]

Ok great because automatic transmissions usually do not make "squeeling" noises that is why I suggested a vid to see if our definition of the sound differs. They are my whiners and growlers lol. Post up if it cures the problem.

[farmtruc]

just an fyi, when the converter is pushed all the way back against the trans; it should pull forward about 1/8"; i would think 1/4" is too much.
If too much, simply put washers between to fill up the space.

Hope it fixes it; my mind was already thinking pump, crankshaft end play lol, if there was that much movement causing metal squeelin, mute point anyway...

[jwang203]

Ok guys it definitely fixed my problem. I had vacuum going to my passenger side valve cover and no vacuum going to my driver side valve cover. It made a very baf whining noise that I would have put money on coming from behind the torque converter. I hope this helps someone in the future. Dont rush hooking up vacuum lines just to hear it run!