I found this interesting article about the weakness of the 4L60E tranny

[97LandCruser]

Installing A Blown Chevrolet Transmission - GM High-Tech Performance Magazine

I will get more info. but i mostly want to make the transmission stronger to excel the 4L80e strength. but i mostly want it for the truck off road and towing.

if anyone know about these upgrade and more i am interested.

hope this is not a repeat post. i couldnt find another

 

[kbahus]

I ran a "built" 4l60e with a big stall in my old drag car for a while. For the cost of a good rebuild with high end parts it sure didn't hold up well. I got a season out of mine before it started having problems. This was back before the 4l80e was a viable option too. I would say just buy an 4l80e, you will be money ahead long term.

 

[97LandCruser]

thanks for the response. i am almost ready to buy a new engine and tranny just trying to buy the right one from the beginning. so many different feedbacks about the the 4l60. i will doo more research on the 4l80e . just dont want it to be a money pit just trying to get it to work with ls1. i will have too look into maybe just buying the 6.0 with 4l80e.
thanks . any more info will be great.

 

[IdahoDoug]

The 60 is a known POS. Get an 80 and be done with it. Former GM Worldwide Powertrain Planner here.

DougM

 

[yoopercharged]

What about the 4L65E? That's basically the 4L60E gearing with similar strength of the 4L80E. The 4L60E can be beefed up and made quite strong. Talk to a good transmission builder. (I am not one)

 

[warpdriv]

If you got the $$$ go with a 6l80. Mark's Adapters said they would have the adapters in Sept.