Ok so here is my delima, I am currently having issues with my 4L60 trans. It is a 105,000 plus mile unit with a Yank SS 3500 convertor. It will not shift out of 1st gear. Im close to 500 rwhp on motor only looking to add N20.So here are my current options I need suggestions.

1. 4L60 Fully built with the Sonnex Smart Shell and the Sonnex 4L60 performance pack, Sonnex 4L60 line pressure booster kit, 300 mm billet input shaft, Sonnex 4L60 Smart Tech input housing, Sonnex 4L60 Super hold servos, with Alto bands.

2. Flt built setup http://www.finishlinetrans.com/trans...meDuty4L80.htm

3. Built turbo 350 with a RVMB and a Pro Trans Brake already installed.

4.Built turbo 400 with.

 

400 or 4L80.

 

200r4....

 

Call FLT and talk to chuck. He will not try to over sale you, and will be honest on which unit would best fit your needs. A friend of mine has had their level 4 60E in his car that makes 525rwhp for 8 years without a lick of trouble.

 

Th400 of you don't need od

4L80 if you do.

 

I agree, Chuck is a great guy and wont sell you something you don't need. My FLT Lvl5 trans is still going strong after almost 7 years. I sold it two years ago but still talk to the guy who bought it. It wasn't a big HP truck but it did weigh in at around 4600lbs and I drove it like I stole it. That trans with the Yank 3200 billet stall was awesome.
I'm considering another FLT trans for my 07 Tahoe.

 

Thanks guys I see that Chuck @ FLT seems to be the go too guy on the 4L60's. I will have to give him a call.

 

FLT is the way to go.

I was about ready to pull the trigger on a Level 4 (as that's all I needed per Chuck), but this Level 6 came available in the classifieds and was sent to Chuck for a refresh. He warrantied it like a new trans and it was just a couple hundred more than the new Level 4. Otherwise, that's what I'd have in my car right now. It's a good trans.

 

Also FLT has a lifetime rebuild flat rate fee. I think it's $450 but I'm not certain. My Level 7 hasn't skipped a beat yet!

 

I have the FLT Lvl6 and it hasn't blinked at 540rwhp...about to bump that up to 700-800rwhp. Anybody put that much to a Lvl 6?? Will it hold?

 

Well I actually decided to go with the FLT level 6. However I added a couple uf upgrades. I added everything minus the 300MM input shaft. I also added the upgraded 1-2 gear set. Everything seems to be good so far Ive only put about 150 mikes on it as to date. And by the way the guys @ FLT are top notch as well.