I am doing a 6.0l swap in the next month or two, and have a question.

Should I get a flt level5, or the speed engineering 80e conversion. I have read that the 80e 1st gear is really tall, but with my light truck, and a 6.0l will it be that big of a problem for me.
By the way I have 99 Silverado rcsb 4x4, and in the begining of next year(hopefully) I plan on making it fi with close to 600hp, so I want a tranny that I will never have to worry about breaking. I'm kind of leaning towards the 80e, but $4000 just sounds expensive, even though I know an engine/trans swap is not the most ecinomical thing to be doing.

 

how do you plan on making 600hp with FI? do you mean fwhp(flywheel) or rwhp(rear wheel)?

stay 65e if possible but no 65e-based trans can hold 600rwhp in a truck, can hold 500rwhp but that is the limit

 

https://www.performancetrucks.net/fo...d.php?t=395355

 

I'm not sure on turbo/sc yet, but it will be happening, because I have been saving like crazy for a while now, and have enough money for the whole deal. I just plan on doing it in stages, for break in/trouble shooting. O.K. I plan on over 500rwhp, but I would really like to over do, rather than just do it, so I don't have to worry about it. The last thing I want for my truck is to have to baby it when I take it on a trip, or just driving around town. If it costs me an extra $1500 to do so, than it's worth it, but if the 65e will be capable than that will be fine too.

Oh, and thanks for the heads up on the for sale BillReid, but I would rather spend the extra $, and get a full kit that I know has everything I need, and will fit.

 

this has everything you need. it sounds like your plans call for an 80e.

 

FYI: you wont have a reliable 600rwhp on a stock 6.0L short block

 

I plan on a cam, heads, exaust, and either a turbo, or sc. You don't think I can get 500+ on that. I am over estimating at 600+, so I can over do my drivetrain to handle it. I did not explain that part, because that is not my question, my question is will a lvl5 65e handle it, or should I go with an 80e.

Should I buy this 4L80e conversion,or this an FLT lvl5 4L65e to be reliable with the hp I plan on putting to it.

I don't mean to be short, but you questioned me twice about the same thing that I'm not even talking about.

 

the reason i ask is say for instance you have 500rwhp, you will be faster with a 65e than with an 80e because the 80e consumes more HP/TQ and the steep 1st gear of the 80e

now 500-550hp is what you could get reliably with a good tune and the FLT Lvl 5 65e is maxxed out at 550rwhp

6.0L + heads/cam/full bolt-ons/10psi = probably around 540-560rwhp IF the parts are matched together

If you plan to never get a forged bottom end or run meth injection id stay with the FLT lvl 5 65e or if you want to go 80e get a stock 80e with a shift kit and you should be good to go

I just dont want you to do complete overkill on your setup and be disappointed with the outcome because a 80e is gonna feel like a DOG down low without boost and yes you will feel the difference, if you can go drive a 2500HD with the 80e to see what it feels like

If you are 2wd you might need to upgrade to a 14bolt rear end, but if you are 4x4 dont worry about it, parish8, a member on here put over 1000rwhp through his 4x4 and didnt have problems

even FLT, the transmission builders will tell you to go 80e if over 550rwhp

you needed to explain this so we know what "it" is, in reference to will a flt 65e "handle it"

 

i still say you go with the 4l80e and strongly consider the conversion kit that 04BlackSilverado is selling (the link up above).

the 80e does have a steep 1st gear, but after that the thing takes off. from what i have heard, you lose a little low end because of the first gear, but you trap at a higher speed in the quarter mile.

 

Sorry for not explaining fully. It's a 99 rcsb stock 4.8l, stock 4l60e, 4x4 on the floor. It has 3.73 gears and a g80, which I know will be my weak link, until I get that done when I do the FI(figured the 80e would be easier on the rear).

I figured going from a 4.8/60e to a 6.0(cam/ exaust/tune)/80e in a rcsb would not feel to much different down low considering hp gain/trans gearing, but I could be thinking wrong. But when the boost happens later (3-6months), I figured I would really feel a difference, and have total reliability.

I have just read so many posts that make me scared of the 60e even the heavy built ones, but at the same time I have read a lot that said the FLT lvl 5 is a beast that will take whole hell of a lot of punishment. I just don't know who to believe. I have read, and read posts after post, and I think I know what I'm talking about, but am still undecided on this one issue. The conversion is more expensive, plus labor involved is alot to take in.


P.S. Once I read my own posts it sounds like I already have my mind made up, I guess I need some justification to myself for spending the extra money.