Quote:
Originally Posted by derotoreut
Hey guys, I am beginning work on my first frame off with LSx install on a 71 SWB. I'm having a custom chassis built by Scott's Hot Rod. I haven't determined my exact engine yet, but I plan to look for a new GM engine/trans package. I decided to go with an automatic transmission and Scott's recommended setting up the chassis for a 4L60e transmission. Can you give me any insight on if this is a good way to go? from what little I know, it sounds like the 4L80e is a stronger transmission, but may be bigger and heavier. What are my options, and what would be a good way to go? Right now I am considering possibly new LS2 or LS3 engine/auto trans combo. Please help me with my auto trans options, so I am able to get the chassis set up properly. I will need to get back with them before they move too far along with fabrication. Thanks.
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You did not mention what your goals are and how you will be using the truck . This will make a big difference on which way we need to steer you . If it is basically a driver with some spirited street driving and a occasional tow the 4l60e will be fine . Of coarse with a good trans tune and a good trans cooler .
If you are beating on it and taking it the track regularly the 4l80e may be a better choice .
If buying a new trans you may look into a 4l60e or 4l70e from finish line transmissions . They have several different levels of builds . I have there level five . This may also be a little easier to set up with a stock pcm . It was a plug and play for me with my 04 truck operating system . This option would not cost that much more than a stock trans new .
If you do use a stock 4l60e and have problems just get it built to suit your need down the road . I have seen people beat on the stock ones pretty bad and they are still holding on. The key is get it tuned to help it survive and a trany cooler. Heat is mostly what kills them during performance .