FRDnemesis

iTrader: (19)

Did anyone catch the comment about a 4L70E in the latest GM High Tech?

GMPP sent two 4L60E's to have 4L70 guts installed in the 4L60 case to hold the power of the transplanted LS7 and a LSX 454 into both F-bodies. The hint was that it was going to be installed into some 09' car, but wouldn't say what car. I'm going to assume the new Camaro.


I'm going to hold off on spending big bucks on a built 200-4R or the purchase of a power robbing 4L80E boat anchor. I'll just put a TH350 in for now and wait to see what comes of this "4L70E" that is supposed to be able to hold the power of a LSX 454.

-jeff

Black X

iTrader: (9)

We have a few great trans sponsors on this site that could provide you with a 60E to sit behind an N/A 454LSX comfortably.

My setup is flirting with 700RWHP and my 60E is supporting it nicely

Rickys S/C Z28

iTrader: (13)

yes i did see that but i cant find any info on the 70 stuff?

Circle-D

iTrader: (21)

The 4L70 is basically a 4l60 with hardened shafts and 5 pinion planets. It also added a cool sensor to pick up the input shaft speed. great tool to figure out what is actually slipping.

It has been in use for a few years, we have done a few in the TBSS.

Here is a picture from GM.



Chris

99BlackTransAm

anyone sell them?

Rickys S/C Z28

iTrader: (13)

so it is stll weak??

Gilbert@Ace Racing

The only reason this series transmission has a bum rap is because of the many builders across the country who think they can buy a box of parts and slap it together. It is not that easy.

You have to ask yourself this question.... Why are there so many engine builders here and only 5 (yes 5) Automatic Transmission sponsors?

The answer is because of the high degree of difficulty. It's that simple guys. I've said it before and I'll say it again here... These units are very formidable in the hands of a capable builder who has the knowledge to build them at the levels we do.

No doubt all of us Sponsors have built the 4L70E's... like Chris said, there are 2 significant changes.... the shafts and the addition of the input speed sensor. There are other minor upgrades and components that support the changes... but other than that they are pretty much the same series transmission.

Good Luck with your projects guys!

g

performabuilt

iTrader: (25)

We have built several and there are a few things of note, From the units we have torn down. All the units with input speed sensors do not necessarily have 5 pinion planets. Just a little some thing of note, Thats not saying that some don't but all don't From a build perspective its the same overall as the 60/65 E units and any of them, the 60/65/70 E can as mentioned be built to take some serious power. So many people get stock rebuilds the local regular trans shop and or buY GM reman units or already have 100000 miles and then they fail and get the reputation as weak. But there are many out there from us and every other sponsor on this board taking some wicked power and living well.
Of course when your talking bout performance cars yes sometimes stuff breaks its the nature of the hobby weather its a rear end, Drive shaft, Transmission, Clutch, engine bottom end its the nature of and part the hobby. luckily I enjoyed working on my car.
I remember when I was a kid and I broke the rear in my car twice and was complaining about it to the old mechanic, He said and it holds true today. Get the best you can and then play but if your gonna play then be ready to pay and if your not willing to pay go get a pinto or chevette (little cars from when I was young) lol

FRDnemesis

iTrader: (19)

What's your chassis weight?



To the people and builders who posted above:

Whatever gearbox I choose is going to be sitting behind a LSX 454 huffing a 200shot of nitrous from time to time, so "it has to live." This post wasn't started to question the integrity of the often "ill-fated 4L60E".

So having said that; what would be your #1 choice of 4 speeds that would give it the best reliability and longevity for your PERSONAL CAR (with my engine package)?

Here is another question. Will a 4L70 bolt up to a LSX motor in an F-body? After reading the article in the latest GMHTP mag where the article mentioned that they(GMPP) stuffed the 4L70 guts inside a 4L60 case begged the question of, why? Why not just bolt up a 4L70 unless they will not fit?

Thanks for any input,
Jeff

FLT

iTrader: (1)

The 60, 65 and 70 are all interchangeable. So yes it will bolt up to your lsX motor. If you are questioning if it will last you might want to consider a 4l80e. Vince

Black X

iTrader: (9)

My truck tips the scales at 3988LBS, if your planning the 200Hit on top of a 454LSX I would follow Vince's recommendation for a 4L80E. Thats gonna be a nasty combo best of luck with it.

As far as will the 4L70E fit an LSX in an F-body YES no question. And the 4L80E does as well its a bit of a PITA but they work.

Cheers

Gilbert@Ace Racing

The only option I see for that powerplant is a 4L80E. Yes it will fit in an F-body chassis.

The whole thing boils down to expectations. If you expect to be inside a 4L6xE series transmission from time to time, then go for it. That transmission will take a punishment. But, we as builders can only take the so far, structurally they are only so strong.

However, if your expectation is to not be into the transmission from time to time... then the 4L80E is your answer. It will handle much, much more power than the 4L60E.

But do keep in mind that even the most well built unit will need to be freshened up periodically. The clutches do wear, thrust washers wear and so on.

Sounds like you are planing a stout combination... feel free to give me a call to discuss some of these options. We help guys just like yourself every day!

g

ShevrolayZ28

iTrader: (4)

454 with a 200 shot and "it has to live"....

I'd have **** myself if the answer was a beefed up 4L70E. Looks like you'll need that power robbing boat anchor.

jay_lt4

iTrader: (4)

the camaro will have the 6L80 trans, 6 spd auto

socmguy

iTrader: (18)

^^^Yep, A6