Automatic Transmission - Th400 to 2003 LQ4
Fast 95 Z28
04-24-2012, 03:23 PM
Not quite sure how to line up the torque converter on my th400 to my 2003 LQ4. I was reading something about a long crank and a short crank? I'm not sure which crank I have since its an aftermarket callies compstar crank? I have a B&M holeshot 3000 stall. i was looking in buying this flexplate http://www.summitracing.com/parts/HUP-HP4004X/ from summit. Do I need a spacer with that flexplate to bolt them up?
Fast 95 Z28
04-27-2012, 12:08 PM
so i guess no one has ever bolted up a turbo 400 to an LSx before...?
04-27-2012, 01:33 PM
I think I can help you. Give me a call at 770-781-0949
Mad dog Lou"
MAD DOG TRANSMISSIONS
04-27-2012, 04:27 PM
The 2003 LQ4 should have the shorter, or regular LS crank. It should stick out past the block about .315. We have an SFI flexplate that will have the LS and TH350 bolt patterns, and most performance TH400 converters have dual bolt patterns. You will also need a converter pilot extension because the regular GM pilot is not long enough to reach the LS crank. Give me a call or shoot me an email if you have any questions.
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