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LS3 5.3L and Transmission from Grand Prix into Bonneville?

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Old 06-06-2012, 10:51 PM
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Default LS3 5.3L and Transmission from Grand Prix into Bonneville?

LS4 5.3L and Transmission from Grand Prix
into Bonneville?


Has anyone tried this Swap?

Can you keep the Tap Shift Tranny function?

I want the 4 cylinder economy, and the 8 cylinder Power!,
that comes with the DoD/AFM.





key words: Active Fuel Management

Last edited by EarlT500; 06-06-2012 at 11:07 PM.
Old 06-06-2012, 10:55 PM
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Its an LS4, not LS3. Just thought I would clear that up. I say Turbo the 4 Cylinder less hassle.
Old 06-07-2012, 02:02 PM
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What year Bonneville?
Old 06-07-2012, 09:08 PM
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Anything is possible, but I don't think this would be as simple as you're thinking. The cradle and mount setups between a W body and an H body are very different. The ls4 has the dogbone style mount at the front and the H body radiator core support isn't designed for that style mounting. You could obviously fab up mounts, but the mounting options of that powertrain are somewhat limited since it is crammed together so tightly. I would love to see it done though.
Old 06-08-2012, 08:32 AM
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The Bonneville and the Impala/Monte Carlo/Grand Prix - both came with V8.

Get the W-body drivetrain - and get some H-body Northstar mounts - thats about the best starting point that you are going to have.
Old 06-08-2012, 11:31 AM
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i have a 98 bonneville with the 3.8. always bothered me that the 2003+ gxps never got the ls4 but grand prixs did



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