How dependable would a FLP level 4 4l60e be with a modded 6.0. I need a tranny rebuild and I'm undecided if I should trust building a 65. I read that the level 4 60e can hold up to 550rwhp!

 

I would go with a level 5 with the 5 pinion planets. If you are going to try to stay away from an 80, I would go with the strongest available.

 

I know Parish8 had real good luck with FLP and often RAVES about their customer service. I agree with greentahoe, I'd go with the 4L65e from FLP as well. I think most people now are going with the 4L80e swap, and I know that Texas Speed and Performance has "swap kits" in stock and ready to go.

 

I doubt I'll be putting the 80e. It seems like a power robber and would only be necessary for those making extreme power. ex: Parish
I agree on the 4l65e but there's a big price difference. Also, 550 rwhp is a lot of muscle. what, 610-630 hp at flywheel.

 

the stock 65E with a good shift kit is holding up to the 6.0's in the SS's. i think the FLP will hold up fine in a 60E behind the same power. if it breaks you'll know it's time to upgrade....

 

Why are you steering away from the 80e?? all in all, you might even spend less on one in the end.

They are straight tanks out of the junk yard, and can easily take 1000 rwhp without breathing.

 

check with slowprocess to see what tranny he went with. i know he seems to enjoy his so far. his 6.0 is pushing some pretty good numbers and is about to get a healthy injection of nitrous to boot.

 

i think the 80e is for big power adders... and NA truck like yours would suffer from it. FLP builds a quality 65. 1 vote for an FLP screw the 80 e its EVIL!!!!!

 

i think you are on the right track keeping the 4l60e/4l65e. the 80 is heavy and a power sucker too. not a direct bolt it either. the 1st gear in the 4l80e sucks if you dont have a shitload of tq.

i think a built 6.0 even with a 100shot or more would be good with one of chucks built 4l60e's. you really have to go nuts to get much over 500rwhp and that is about when the 80e would come in handy.

 

Call Chuck and talk to him - he's definately interested in hooking us truck guys up with an awesome tranny and has recently spent a bunch of time developing some billet options to make the L5 even stronger.