I just installed a 4L65e in my truck with a Yank SS3600 stall. The trans is built and also has a Trans Go HD2 shift kit, hardened separator plate, Corvette servo, servo release check valve, aluminum accumulator pistons, and I think that's it. I put one washer in the accumulator for the stall.

The problem is that the truck is now sluggish.....really sluggish. I know the PNP switch is misaligned because it reads reverse when in park and shows 2nd when in first. I do have overdrive and the converter does lock; its just getting to that speed without stabbing on it takes forever.

Would the PNP switch cause this or would it be something else? It shifts so smoothly you don't hardly notice it; I did zero out all the shift tables in HPT and I also installed LT's but the 02's are reading fine.

 

Is this the first time running a converter that big??

John

 

Yeah, I was really suprised how much my SS3600 soaked up shifts... By saying you "zero'd" the tables.... Which ones did you zero and why?

If you'd like I could send you my trans tune for you to try. All you'd have to do is use your pressure tables since mine are zero'd due to me having vacuum modulaton. My trans settings are tailored to me and how I drive and my setup but they may give you a better starting point for shift timing, lockup and things with that converter.

 

Yeah it is; that may have something to do with it since I've heard Yanks were tight. I guess I was expecting it to be more like my buddy's 3200 Vig in his Formula.

I zeroed the shift timing table because of the shift kit. I've read that's what you're supposed to do but IDK honestly. I'm going to change them back and see if it makes any difference. I did a couple of WOT blasts this morning and it feels good I'm just not used to barely moving at 2500 rpm I guess. I also returned the line pressure back to stock.

If you don't mind I would like to see your tune for reference. My email is r.lee.young.jr@gmail.com

Thanks guys

 

The PRNDLE could have and affect I would correct that first

 

Be sure to check your fluid level. A higher stall converter will feel much looser under part throttle untill it gets fully primmed. Otherwise you may just have to get used to a high stall converter in heavy vehicle. Your buddy has a tighter stall in a lighter vehicle so your's should feel a bit more 'sluggish' under part throttle.

 

my sc3000 is very loose also...wish i would have gone with the tt3000 or 2600 instead

 

You zero out the desired shift times table to disable adaptive shift learning... Adaptive shift learning purpose is to compensate for worn parts, to make sure your shift stays the same over time and prolong tranny life... Adaptive shift learning compares the actual shift vs. desired shift times (the table)... If the actual shift is tooo fast, the computer will lower the tranny pressure and vice versa... Why is this important when adding a shift kit or built tranny?? A shift kit/ built tranny will speed up the shifts mechanically, so when the computer sees it shifting faster, it will lower the tranny pressure...
The only way to accurately input the correct values is to log the 'Last shift' vs various Delivered Trans TQ, log this while the shift times are at zero... Then get a good average and input that into the table... Just my .02.....

 

If you have never driven something everyday driving with a decent size stall sounds a little to me like you just need to get used to how it drives under normal driving conditions.

The converter will actually get a little tighter feeling too as you get some miles on it. When I first got my tt3000 it felt really loose when it was new and then it felt like it tightened up some and now three and a half years later I can't even hardly tell it's there.

You may have other problems but that sounds like part of it, just my opinion.

 

Thanks guys; looks like most of it is just me getting used to things

It does come alive now when the converter flashes