Parts list for 4.3 vortec to 5.7 swap

[Poon]

Hi guys,

I have a '97 Vortec 4.3 rcsb and I just bought a parts truck '96 vortec 305 extended cab for the rear end and a few other bits.

What V8 accessories should I save from the 305 parts truck that I could use when I swap in a 350 crate motor down the road into my 4.3l truck?

I'm saving:
-wiring harness
-all the accessory drives and pulleys
-intake w/ fuel injection
-engine management parts + dizzy
- ECU (I think 305 and 350 are different, but hoping can still use it if I get it tuned? )
- downpipes/most of the exhaust
- gauge cluster (incase there are parts needed for 8cyl tach signal vs the 6 cyl)
-engine mounting brackets
-trans ecu (if they even have one)
-cooler lines and radiator

My biggest question, can I reuse the trans (4l60e) that is currently in my 4.3L V6 truck with the 350 motor I plan to swap in down the road, or do I need to use the 4l60e from the v8 truck? Does the trans stay in the same position it was in with the v6, or do I need to save the bracket off the V8 truck?

Thanks for any help. I feel like I've searched fairly extensively, but couldn't find the info specifically about if you can reuse your 4l60e and the mounting position.

Thanks,
Andrew

 

[stutaeng]

I think for those years the transmission is actually the same. Use the one that you know works or has seen better life/service.

They have changed the input shaft of those transmissions over the years, but it looks like on 96/97 they are the same. Read here on post #4:

4l60e 300mm shaft on v6? - LS1TECH - Camaro and Firebird Forum Discussion

Automatic Transmission - 4l60e 300mm shaft on v6? - Hello everyone. First time posting here. I am in the process of swapping a ls engine into my firebird. I got the engine and trany out a while ago but but finally cracked them apart tonight. I am surprised to find a 300mm shaft on the...

ls1tech.com

The final iteration of the 300mm is considered the strongest of the three FWIW.

The transmission stays in the same location as on your V6.

 

[stutaeng]

I have read on other forums some guys say the V8 transmissions had more clutches than the V6s. However, I don't know if that is true or not...there's no mentioned about this here, so probably not:

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I know on the 300mm (the "LS" bellhousing bolt pattern) input shaft version, there are no differences between the V6 and V8s.

BTW, no separate ECU for the transmissions; it's controlled by the engine ECU.