Help LQ4 T56 swap problem

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Mar 7, 2016 | 11:54 AM

chaney1974

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From: Amery,WI

Help LQ4 T56 swap problem

so I went to bolt together my LS T56 to my 1999 LQ4 and the tranny bottoms out in the pilot bearing before the tranny meets up to the bell housing? I have researched this the best I can and haven't found any real answers why? Any input would help thanks

Mar 7, 2016 | 12:13 PM

onebadbowtie86

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From: Traverse City MI

The 99 and 2000 lq4 have a longer crank and I dont believe they are compatible with the ls t56.

Mar 7, 2016 | 01:11 PM

shoeboxvette

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From: Kaneohe, HI

Quote:

Originally Posted by onebadbowtie86

The 99 and 2000 lq4 have a longer crank and I dont believe they are compatible with the ls t56.

unfortunately you may have one of the longer Cranks that they made to work with the 4l80e trans
If you look at the back of the Crank and it extends 1/2" or so past the rear seal you have a longer Crank.

Mar 7, 2016 | 01:27 PM

chaney1974

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From: Amery,WI

this motor came from a manual 3/4 chevy that's why I am puzzled on why the t56 is not working but it having a longer crank makes sense. I have been searching for some kind of bell housing adapter but no luck

Mar 7, 2016 | 01:51 PM

garys 68

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From: Camdenton, MO

Does the motor have iron heads? If so, it's a long crank.
Do a search here, there are old threads with pics showing a long crank and issues with the manual trans and flywheel.

Mar 7, 2016 | 02:52 PM

iliveonnitro

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I had to swap the (long) crankshaft from my '00 LQ4 to match my T56. I wound up buying a forged one after I bought a used short crankshaft, so if you want the short crankshaft, let me know.

Mar 8, 2016 | 08:20 AM

Cobra20

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The easiest way to fix your issue I believe is to convert your ls1 style t56 to the lt1 style. You will need the input shaft, midplate, and the bell housing.