n2ols1cam

Hey guys, i purchased a used level 4 4l60 from a friend of mine. He said it was built by FLT and it has roughly 15k on it. i was wondering if it will handle my setup, i have a PY3600 converter and 3.73 gear and i make 420 rwhp and 400 rwt N/A. im not sure what it will make on spray yet but i am planning to spray a 300 shot. do i need to worry about my trans or the input shaft? thanks for the help guys!

dannyz

Well, I can tell you that when I called FLT to get their input on a trans, they recomended a level 4 tranny. But I am only pushing 423rwhp, and that is WITH a 75 shot of juice.
So I would give them a call, and don't be surprised if they try and steer you towards a more robust tranny.

soundengineer

iTrader: (16)

good luck making a 4l60 of any level last at anything over 550-600 horsepower...
and even that is pushing it in my opinion...

not saying it cant take it for a little bit...but its certainly not going to last long

you really need to step up to a 4l80 or a th400 when you get to that point...
and if you are a heavy car....it better be a pretty well built 4l80.

hardcore

iTrader: (2)

Not sure i agree with that... A well built 4l60 should be able to handle the power.. would a 4l80 or th400 do it better.. Yes
I've been ruining a 4l60 for 7 years and if it was a big problem I would have switched by now.. and my car's a little heavy and a little fast

87silverbullet

iTrader: (11)

I don't think this is necessarily true. There is a member on here named JUNK and he has a c6 z06 with a 441 cu in motor with a 4l60e he built and a 330 shot and not saying it lives forever but it takes the abuse for a full year of racing before it needs to be refreshed.

Also, about the 4l80e thing, there are guys here that have taken stock 4l80's in stock form with a shift kit and are running well into the 9's.

SPRAYED 01

iTrader: (22)

A FLT built 4l60e should never fall into that general rule of thumb that a 4l60 cants last with any power. Those guys know what they are doing. Ive been running their level 7 for a couple years with a trans brake and anywhere from 600whp to now almost 800whp,no issues at all with it. I think they are going to recomend you get billet input and output shaft and some new updates they have come up with in the last year.

WSsic66

iTrader: (2)

what did you pay for your used level 4?

n2ols1cam

thanks for the input guys! i really hope the trans will last at least a year.

n2ols1cam

i bought it used for $800 with 15k on it

Sofls1

iTrader: (16)

First thing I would do is speak with Andy @ FLT he will point you in the right direction.

I run a level 5, I drive it daily and spray a 175 shot on mine and I make about the same power on motor as you and so far it hasn't skipped a beat after almost 2 years. The only reason I haven't sprayed more yet is because I have been working on the 60ft. Once I get the car to work, I will be stepping up the jets.

In the end, you have to think about what you're trying to do, and your end goals. A well built 60 has gone fast in many different cars, but it does have its limits. I think you will end up wanting to upgrade the output shaft to billet and send it back to FLT for any updates and a refresh especially since you got a good deal on that unit.

n2ols1cam

i called FLT and spoke to someone but im not sure who it was, they didnt give me a straight answer they said "it would handle a lot, we cant really rate out transes by horse power"

the only problem with that is i already have the trans in the car because its the only car i have.

Sofls1

iTrader: (16)

What I would do if I were you is start with a smaller shot first. Say 150hp, get the tune down right, and see how the trans reacts, and how fast you go. If all goes well, move up another 25-50hp and see how it goes. etc. etc. I'm not sure what you're goal is, but I wouldn't start with a 300 shot from the beginning.

n2ols1cam

yeah i agree with you. im on a 200 right now and i was just curious about my limits with this trans. my goal is to dip into the 9s with my set-up. the car weighs around 3400 without me in it and its basically a full suspension car. i want to hit 9s with what ever shot i have to do.

dannyz

Adding 25-50 hp of nitrous at a time is great for reading plugs, but a trans is different. It may well handle a given amount of hp just fine for a while. But then theres that time it hits the rev limiter from the 1 to 2 shift, then again on the 2 to 3. So you lower your shift point's. And all is good for a run or two. Then, whoops, hit that rev limiter again. Your trans is on it's way out. The more you mod your engine, the more dough you gotta spend to ensure the rest of the car can handle the power. So maybe a smaller shot for now would be the way to go.

n2ols1cam

what shot would you recommend?

dannyz

I would say that a 125 to 150 rwhp shot should be safe. But understand that I am just guessing, and have nothing really to base that on.
Just being honest.

dnkynrbk

iTrader: (34)

stay with 150 for now. I wouldnt be pushing the tranny hard. You may see if FLT can put new clutches in it and cut you a deal. Put a good trans cooler on it

n2ols1cam

i actually have 2 b&m coolers on there.