Posted: Mon Mar 18, 2013 4:25 am Post subject: L67 Swap Help
Okay, i am a proficient mechanic, but my research on the web keeps confusing me on the details. I need to know specificly what parts i need for a L67 swap onto my 2000 LS 3800 series II. Plus any first hand advice would be greatly appreciated too. I know i need heads, intake, supercharger, and injectors from a 2000-2005 impala (with stock supercharger), now i just need someone to fill in the blanks for me.
The reason for the transmission comment is because the L36 trans won't stand up to the power that the top swap will make for very long.
The trans in the L36 is the 4T65-E, the L67 had the same trans but it was the HD version of it. (different pass side axle and differential) Basically it has a larger differential with a shorter pass side axle.
So, if you want you could just grab the differential and axle off a donor car from the junk yard. If you plan on modding it farther, I would suggest just getting a built trans from Triple Edge Performance.
I've seen people make 300-350 WHP with his trans lasting over 100k. Best transmission for this car you can get. You could even email him, tell him your car info and what you are planning on doing and he will build you a trans that will hold to that.
Just be sure if you swap transmission or upgrade it, you will need to check what the FDR is. If you currently have a 3.05 FDR and the new trans has 3.29 (i'd recommend this one anyways) your shift points will be off and you'll be throwing a CEL. Easy fix, just get a tune for the correct gearing.
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