4L60E advice

[BigDsCJ7]

So according to my last posts, my 86' CJ7 had a SB 350 and a 700R4. Well that wasn’t enough so I picked up a 94' LT1 and a matching 4L60E. So after getting it all together, I was just driving around town when the Transmission made a loud bang between 2nd and 3rd and I lost all forward gears but reverse still worked. Had it towed and pulling the Transmission and taking it to have it looked at.

So my question is:
Stock 4L60E is rated for 275 hp and I'm putting out around 320 hp. What upgrades should I do while the Transmission is apart to make it able to take the beating this bad a** motor is going to hand out?

Thanks for any input and I will post what broke as soon as I know.

 

[Old Dog]

IMHO the best up-grade would be go to a 4L80
sorry I'm not up on up-grading the new stuff.

 

[BigDsCJ7]

Thats ok, I know that the 4L60E can be built up to handle 500 hp but I'm not going to upgrade the motor anymore. Trust me, the 300+ hp I have now is more than enough!

I guess I'm looking to only upgrade what will help it handle the HP. I don't want to spend any extra money. I didn't look into upgrading to a 4L80E but I can bet it would be expensive.

 

[derf]

There are quite a few "standard" upgrades for the 4L60E. So much in fact that it's hard to specify a list without knowing what you're going for. Simple google searches will turn up quite a bit.

You can swap out the planetary gear sets, add kevlar clutches and bands, a few servos and you'll have more than enough in that Transmission to hold up to your engine. Most of what I call "level 1" upgrades don't actually cost any more than getting the factory replacement parts.

 

[BigDsCJ7]

Thanks! That's good to know. So I'm looking to be able to handle 400 hp (320 hp) from the motor, and be able to take it if I get on it along with some lower gear off-roading. Not hard core crawling though.

 

[derf]

Here's one example of a place that specializes in the 700R4/4L60: 4L60E Performance Transmissions from PATC

They have a bunch of good general information on parts. Some of it is sales fluff to get you to buy their parts but it's not a bad place to look at for basic info.

 

[BigDsCJ7]

So, took out the Transmission and WOW! Its a broken output shaft. Had it rebuilt because it had to be completely taken apart to replace the shaft. Changed out some parts to handle 500+hp. Good to go and all back together. Filling the fluid and taking it out for a spin today after work! Thanks for all the help. Everyone here has always been awesome! I'll post some new pics of the LT1.

 

[derf]

Glad you could get it back together alright. Those upgrades should work just fine for you.

 

[BigDsCJ7]

Thanks derf. It's so funny though, now that I have gone through all that to fix it, I drive like a grandma! I'm sure once I get use to driving it again I'll be back to my old smoky burnout self.