Conversions & Swaps LSX Engines in Non-LSX Vehicles
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Old Feb 11, 2011 | 07:50 AM
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Default Flywheel Question....

I am swapping a 2000 LS1 into a 95 Z28. I know that the LT1 flywheel will only work if I use a spacer to line up the teeth with the starter. My question is what if I used a flywheel from a 2000 Z28? Any issues bolting up to the older 4l60E tranny?

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Old Feb 11, 2011 | 08:48 AM
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The older flywheel will NOT work - the bolt patterns are incorrect.

The LSx flywheel is what you need with the spacer after the flywheel and six longer bolts. The bolt holes will have to be elongated for the torque converter with a die grinder, Dremel or file (it's not far off). There are conversion kits with what you need but if you aren't racing the factory stuff is fine.
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Old Feb 11, 2011 | 08:54 AM
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I'm pretty much a newb...just to the point of knowing what questions to ask! lol Thanks for the info. I can get a flywheel from a 2000 Z-28. If I get that where can I get the spacer? And what is the correct term for it?

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Old Feb 11, 2011 | 09:16 AM
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GMPP sells the spacer and bolts you need but there are other places that have them too. I have a GMPP dealer close to me and when I bought mine there weren't many other options. I think it was around $90 for the adapter and six new longer bolts.


The GM part numbers are 12563532 and you will need six of 12563533. The big online performance houses sell this stuff too, but I got it cheaper through my GMPP connection. There are other companies that sell the same parts form aftermarket manufacturers but I don't have any info on them.

You do realize the LSx PCM can't control the 1995 torque converter lockup and shifting, right? The 1996 and newer transmissions are Pulse Width Modulated and the older ones are not. This and the spacer info are covered in my Thunderbird build topic in my signature.
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Old Feb 11, 2011 | 10:39 AM
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Is that the same spacer that would be on the flexplate of an LQ4/4L80E? If so, I have the flexplate and the spacer.
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Old Feb 11, 2011 | 10:41 AM
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Originally Posted by Earl Filter
Is that the same spacer that would be on the flexplate of an LQ4/4L80E? If so, I have the flexplate and the spacer.
Same, same.
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Old Feb 11, 2011 | 11:54 AM
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Originally Posted by gofastwclass
You do realize the LSx PCM can't control the 1995 torque converter lockup and shifting, right? The 1996 and newer transmissions are Pulse Width Modulated and the older ones are not.
The 95 4L60E is PWM TCC so yes it will work. I used the flexplate and spacer kit from advanced adaptors part# is in my swap thread.
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Old Feb 11, 2011 | 04:54 PM
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What other cars is the 4L60E in that will work? Btw...good write up on your swap...fun read! I could relate to the part searching!
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Old Feb 11, 2011 | 06:04 PM
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Originally Posted by waxenate
What other cars is the 4L60E in that will work? Btw...good write up on your swap...fun read! I could relate to the part searching!
You can use your original transmission

Last edited by flame; Feb 11, 2011 at 06:13 PM.
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Old Feb 11, 2011 | 09:18 PM
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Funny.....I had been thinking I should pm you! Thanks
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Old Feb 12, 2011 | 01:31 AM
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Originally Posted by flame
You can use your original transmission
You said that twice.

That would be cool if he could. The things I read in multiple places from trans shops, etc. when I was searching said you can't and 96 was the magic year. I know spotting one is as simple as removing the converter and looking for PWM on the front pump. I've been wrong before, so my feelings won't be hurt if I'm wrong again.
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Old Feb 12, 2011 | 08:22 AM
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Originally Posted by gofastwclass
You said that twice.

That would be cool if he could. The things I read in multiple places from trans shops, etc. when I was searching said you can't and 96 was the magic year. I know spotting one is as simple as removing the converter and looking for PWM on the front pump. I've been wrong before, so my feelings won't be hurt if I'm wrong again.
When he asked about getting a trans I figured he didn't catch that the first time. The trucks didn't use PWM until 96 so you are partly correct.

I included a pic of the wiring diagram to take away any doubt you have whether it will work or not.
Attached Thumbnails Flywheel Question....-tcc.jpg  
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