Engine/Transmission/Performance Adders Chat about your engine, transmission, nitrous, superchargers, turbos, and tuning.
Sponsored by:
Sponsored by:

6th Gen ('00-'05): L67 Swap requirements

  #1  
Old 11-17-2018, 04:26 AM
UJustGotSarged5's Avatar
Thread Starter
Join Date: Aug 2018
Posts: 30
Default L67 Swap requirements?

Hey guys back again. I have the L67 engine with 100k miles and fixing to buy a 4t65E fully rebuilt to go with it. I'm swapping my 3.4 out of my 03 LS with the L67. My long turn power goals are 300 HP at the crank. Is there anything I am missing or need to take into account? Will the non HD version hold 300 crank HP?

 

Last edited by UJustGotSarged5; 11-18-2018 at 10:27 PM.
  #2  
Old 11-23-2018, 12:29 AM
Monte Of The Month -- October 2009
10 Year Member
5 Year Member3 Year Member1 Year Member
Join Date: Feb 2008
Posts: 4,213
Default

The only difference in the transmissions is the diff. The non HD have been pushed just as far as stock HD units and the failure always seems to occur elsewhere with big power (unless you do 1 wheel burnouts).

In terms of holding 300 crank, it'll hold, but not forever. Just look at the 5.3L cars with the slightly modified 4t65 at 300. They live decently, but most die pretty quick. I'd definitely start saving for a moderate performance build on the trans for peace of mind and long term durability.


​​​​​​
 
  #3  
Old 11-23-2018, 11:08 AM
UJustGotSarged5's Avatar
Thread Starter
Join Date: Aug 2018
Posts: 30
Default

Originally Posted by bumpin96monte View Post
The only difference in the transmissions is the diff. The non HD have been pushed just as far as stock HD units and the failure always seems to occur elsewhere with big power (unless you do 1 wheel burnouts).

In terms of holding 300 crank, it'll hold, but not forever. Just look at the 5.3L cars with the slightly modified 4t65 at 300. They live decently, but most die pretty quick. I'd definitely start saving for a moderate performance build on the trans for peace of mind and long term durability.


​​​​​​
Would it be a good idea to take the trans I bought (it's fully rebuilt) and replace a few parts with performance ones? Also I heard I need the passenger side Axel as well
 
  #4  
Old 11-27-2018, 02:10 PM
Monte Of The Month -- October 2009
10 Year Member
5 Year Member3 Year Member1 Year Member
Join Date: Feb 2008
Posts: 4,213
Default

Originally Posted by UJustGotSarged5 View Post
Would it be a good idea to take the trans I bought (it's fully rebuilt) and replace a few parts with performance ones? Also I heard I need the passenger side Axel as well
You should only need a passenger axle if you get a HD trans (or do an HD upgrade to a non HD trans).

That's a hard spot with that trans you got. There are certainly some performance parts you could put in to help it survive longer with 300 hp, but they're going to require tearing the trans down again to do them. Probably more cost than its worth at this point as you'll nearly pay rebuild cost again unless you can do the labor yourself.

As long as you're confident that the rebuild was done properly, I'd probably just drop it in and run it and see how long it lasts. Once it starts acting up (if you even still have the car at that point), then you could rebuild with higher performance stuff. I'd just make sure to pull it when you start noticing issues and don't wait until something grenades itself and takes out half the hard parts with it.
 

Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.