Just trying to get some opinions on the Yank tt3000. I Just picked one up for my 05' 4.8 Sierra and just want to hear some overall opinions from those who run them in their DD's. Have read alot of good things about them from the searches I have done on the site.

Anybody have any complaints or things they don't like about them? And do they really affect mileage that much? Also how much did 3rd gear soften up after install? I really don't want it to be a turd on the freeway when it downshifts or under part throttle.

 

Well you asked, so I'll tell.

I had one and frankly I didn't like it at all. Even in my 4.8 it brake-stalled to about 3500 rpm. This made for very loud and loose driving going uphill, and since I live in a hilly town I was not popular with the community. The feel was very much like the old "slim jim" Roto-Hydramatics they put in Pontiacs and Oldsmobiles back in the early 1960's. I installed it the same time I did a GT2-3 cam, and I'll admit it did bring back some power that was lost to the cam, but drivability was the pits. Overall I lost about 2 - 3 MPG. The cam/stall combination made the truck feel very ricey (weak low rpm torque, lots of power above 4000 rpm), even with the Radix blower. Of course people's tastes vary, and you may like it, but I hated it enough to swallow my losses and go back to a stock stall (and a 6.0L w/ a stock cam).

 

Sure you had a Yank TT series stall man?
Not saying yours didn't act how you say it did but honestly your the first one i've ever seen complain about the stall being loose.
I ran a TT series stall and even with my cammed setup on a 6.0l in a ECSB truck i coudn't make it stall to anywhere close to 3500rpms like you say yours did.
Now my YANK PT3200 sounds a little closer to what your saying but for me it doesn what i want it to do.

Also a converter won't hurt mileage much unless you go big. By big i mean more than what you have for damn sure.
It may eat a little mph in the quarter but you will be faster.
Just put it in and you'll love it.

 

Hmmm... well it was *supposed* to be a TT3000, unless they sent me the wrong one, which I guess is possible. Yeah I was surprised too, as everything I had read on this board said Yanks were on the tight side if anything. I still have it sitting in the garage. It's cherry red color and looks exactly like the stock unit, only a little smaller.

It was probably the cam that cost me the most MPG. That thing made the 4.8 an absolute dog at low rpm, so accelerating from a standstill or highway cruise I would have to really get on the go-pedal. This of course would force the engine into boost, with the attendant 11.5:1 AFR. Bottom line anyway - it sucked.

BTW, SlvrSierra4.8, you may have to turn up your TCC lockup pressure a bit. I had to because the TCC would go into a lock/unlock oscillation at around 45 MPH. Also expect quite an rpm jump as the TCC goes in and out of lockup.

 

Well it's possible i'm sure. I also noticed you had a radix on the motor. Thats alot of low end torque.Which of course is the main thing that would overpower a stalls rated level.

I had the 2600 in mine it was fantastic just not enough for me.
I have the Yank PT3200 now and with the new setup it seems to be around a 3500-3600 flash. I still like it however lots of fun.

On bumping up your lockup pressure did it affect the feel of the stall locking?
My 00"does that some times were it will lock then a few mph later unlock.
It's a damn stock stall in it though lol. Could be that i swapped from a 00 pcm to a 02 pcm.

It did it alllll the time on my 04 but with the new stall it feels like another gear it locks so hard.

 

GMC DUDE...Thanks for the info, good tip on the lockup pressure as well. Something like your situation is exactly what I am afraid of.....LikeTouchOfEvil04 said this is the first time I have heard anything bad about the tt3000 as well. For it to brake stall to 3500 rpm seems way out of place especially behind a 4.8. I just hope the one I have is as tight as most describe

 

Well once i realized he had a cammed/radix motor i can kinda see how it would brake stall over what it should. Nothing NA is gonna make it do that.
I coudn't make mine even get to 3000 on a brake stall in my 6.0/cammed ecsb.
The TT series are very tight converters and offer what i've seen to be the best driveable/performance stall on the market. This is of course my exp. with differant stalls as i've driven trucks with quite a few differant company names stalls behind em.
The TT yanks drive the closet to stock to me.

 

Yeah, most people seem to be really happy with the TT3000 (and the GT2-3), which is why I went that route. Maybe you'll have better luck, but I really have to be honest and say I did not like the combination.

Now that being said, I must also say that I believe the truck had much more power, and would have done well at the drag strip (did not have a chance to run it before a tranny hose broke and puked out all the fluid, toasting the tranny . ). However, for a DD the thing was a disaster, so I decided to go with a 6.0L and optimize for low end torque even if it means lousier ET's.

Evil, yes after I recalibrated the TCC pressure, it felt like a fifth gear engaging, which I liked. I can probably scare up the tables and post them if you want.

 

If ya don't mind man. I'd like to compare em to my reg cabs pressure settings vs my 04's settings as well.
I recently got hptuners and need some stuff to do lol.Other than scan which is about all i've done so far.

 

OK, in fact I can send you the whole .BIN files if you want them.