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Old 04-17-2011, 02:18 PM
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350 to LQ4?

Has anyone run a 350 chevy trans behind a LQ4 motor? or is that even possible? Wise? etc etc etc

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Old 04-17-2011, 08:44 PM
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Quote:
Originally Posted by bill plise
Has anyone run a 350 chevy trans behind a LQ4 motor? or is that even possible? Wise? etc etc etc
Check Google but I'm pretty sure I read somewhere that you need a spacer between the crank flange and flexplate but not 100% sure.
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Old 04-17-2011, 09:22 PM
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there are flywheels to use with the proper bolt pattern for the converter of the t-350. There is a spacer for the converter pilot hub to 6.0 crankshaft.

Where it gets goofy on 6.0 engines is GM built some 6.0 engines with an extended crankshaft flywheel flange. I was told to avoid these engines for this type of conversions. I do not know how - what - where to determine the 6.0 engine application to avoid
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Old 04-17-2011, 09:35 PM
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Quote:
Originally Posted by bill plise
Has anyone run a 350 chevy trans behind a LQ4 motor? or is that even possible? Wise? etc etc etc
Can you fit a newer 4L60E or 4L80E in your vehicle? The gen III/IV engines came with those transmissions so you should be able to find one that bolts bolts right up. Plus you'd have the benefit of an overdrive.
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Old 04-18-2011, 08:00 AM
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ls engine swap

there is a spacer for the trans, gm sells it. you will also need a different flex plate. if you don't, the torque converter and pump will fail because the torque converter doesn't fit into the rear of the crank properly so it isn't centred. the early 6.0l vortec with the 4l80e trans is the only one that accepts an early gm auto trans without a flex plate adapter or spacer. these vehicle came with the gm spacer and bolts and that factory flexplate. these are basically the same components needed for the older trans swap, just done at the factory. (copied from the book "how to swap a gm ls series engine into almost anything") you have to use a spacer with longer bolts, or a custom torque converter that has a longer crank hub.bowtie overdrives makes the torque converter that is custom fit to mate up to a stock flexplate. in my opinion it would be better to use the tans and engine combo from whatever the donor vehicle is. get the computer to go with it because they are sort of matched up as far as sensors etc. you may need to get the stock computer flashed when you are done to eliminate some of the stuff you won't be using, like air bags etc. there are several sites to check for that. LS1Tech is a good one.I am putting a 5.3 engine and 4l60e trans in my 57 gmc, so that is what I will be doing with my engine trans combo. haven't got as far as the engine yet. still working on the frame so far.
the how to swap book is ok, there is quite a bit of stuff on specific swaps like into a volvo or a bmw. it does have some basics on stuff like the trans swap and info on what engines are better and what they came in. i have heard there are better books, but the guys on the ls1tech site would maybe be able to help out there. there is a forum there as well.
have fun, kep us posted,
dsraven
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