Conversions & Swaps LSX Engines in Non-LSX Vehicles
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4L60-E Transmission

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Old Apr 23, 2003 | 10:14 PM
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Default 4L60-E Transmission

I'm swapping from a 3.8 to a LS1. Is the bolt pattern for the transmission the same for both?
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Old Apr 23, 2003 | 11:19 PM
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Default Re: 4L60-E Transmission

I would bet they are identical. GM is pretty good at making transmissions interchangable betwen their different engines. For example, a TH350 or Powerglide will still bolt up to an LS1.

Tony
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Old Apr 24, 2003 | 05:31 AM
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Default Re: 4L60-E Transmission

Unfortunately the 3.8, regardless of what vehicle it is in, uses the GM front wheel drive style of bolt pattern. It's completely different from the LS1.
We have used these transmissions for Northstar rear wheel drive conversions.
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Old Apr 24, 2003 | 06:01 AM
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Default Re: 4L60-E Transmission

So, if I had the standard, I could use the transmission, but since I have an auto, I have to get a new one, right. Which would be cheaper a 4L60-E that fits, or converting to a standard?
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Old Apr 24, 2003 | 07:04 AM
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Default Re: 4L60-E Transmission

If by standard, you mean the 5 speed that backs the 3.8, I'm not sure how you would use it either. Maybe someone has an adapter plate or something. I have not tried that type of conversion. I would think grabbing a 4L60E that fits would be the way to go.
There are a few that have made the V6 to LS1 conversion here I think, maybe they'll chime in with more info.

John
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Latest numbers: 9.71 ET, 141.42 MPH, 1.40 60' , 610 RWHP Mustang Dyno

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