LQ9 to TH400??
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Teching In
Joined: Mar 2015
Posts: 7
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LQ9 to TH400?? I have an LQ9 out of an escalade that I am bolting a TH400 to the back of. I have done the research and got the spacer and longer bolts. I just want to confirm I have the right flex plate before I bolt it all back together.
I know this is a big confusing topic on the forums. I have read so many different things. I used the stock LQ9 flex plate and elongated the TC holes a little bit to bolt it up.
Also will the stock LQ9 starter work or to I have to get a starter from a truck that had a 4l80 in it?
I know this is a big confusing topic on the forums. I have read so many different things. I used the stock LQ9 flex plate and elongated the TC holes a little bit to bolt it up.
Also will the stock LQ9 starter work or to I have to get a starter from a truck that had a 4l80 in it?
TECH Fanatic
Joined: Jan 2015
Posts: 1,114
Likes: 33
From: Fort Worth, Texas
You need a 4L80E flexplate that is flat, '01-'06 2500HD LQ4/4L80E for an application.
The 4L80E flexplate has 6 torque converter bolt holes on a 11.5" bolt pattern, Lucky for you....TH400 converters have a 11.5" bolt pattern, Of course some aftermarket converters are 10.75" & same for stock TH350 converters which also fits TH400's.
If you have a 10.75" pattern converter......Re-drill the flexplate.....3/4" is too much for slotting the holes.
The 4L80E flexplate has 6 torque converter bolt holes on a 11.5" bolt pattern, Lucky for you....TH400 converters have a 11.5" bolt pattern, Of course some aftermarket converters are 10.75" & same for stock TH350 converters which also fits TH400's.
If you have a 10.75" pattern converter......Re-drill the flexplate.....3/4" is too much for slotting the holes.
