How to tell if I have a long crank LQ4??
07-01-2013, 12:49 PM
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How to tell if I have a long crank LQ4?? I picked up a cheap LQ4 rotating assembly with a ton of miles. My plan is to rebuild it with forged internals and re use only the block and crank. I just found out the 99-00 LQ4's came with a longer crank and will cause a head ache when it comes to trans options. The heads and flex plate were already off the motor, is there any other way to tell if it's a long crank??
07-01-2013, 05:03 PM
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You should have about 1/4 inch of crank sticking out of the rear main seal. The early engines will be 3/4 to 1 inch sticking out. A few 2500 series 4L80E Suburbans came with a removable spacer that sometimes rusts on and looks like part of the crank.
Kurt
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07-02-2013, 08:02 AM
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Thanks man. I checked it last night and I do have a long crank. Dammit. I was planning on running a TH400 but it seems like the converter becomes a PITA. Looks like I need a crank, is the rear main cover the same?
02-16-2019, 03:28 PM
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05-10-2020, 07:48 PM
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