I've got a Radix in my otherwise stock 5500lb Avalanche, but would like to put a little more of that power to the pavement while at the same time firming up the shifts, ensuring longevity for my drivetrain, and keeping street manners. I've been reading all night in this forum about TC's and shift kits, and am thinking about the following:

- TT2600
- Transgo HD w/Corvette servo

I'm not going to be racing the truck (well, not planned races... ) but would just like a little more aggressiveness and confidence from the HP/TQ I've got. The TT3000 sounds like it's a favorite here but I don't know that I need it. In my heavy vehicle, won't the 2600 behave more like a 3000? I certainly don't like the idea of sitting at a light giving the gas to my vehicle and having it not go anywhere....isn't that what happens with a higher stall?

Also, what about Corvette vs. billet servos? Are there 2 servos or 3 in the 4L60E? I keep reading about the 1-2 servo and the 3-4 servo, but no one talks about a 2-3 servo. Is there one? I've also read about Corvette for the 1-2 and billet for the 3-4....why is this?

 

THe TT2600 is a very nice converter. It is very tame and has really good street manners. It will have a little of that giving it gas and not going anywhere, prolly up to about 1200rpm before it start to pull. THe TT3000 revs to about 1600 before it starts to pull. Both are good converters, but I think if you go with the TT2600 your gonna do the same thing I did, wish you had gone with more stall. The TT3000 is loose as a $2 **** on the weekend after it first gets installed, but feels MUCH better after some miles. It's your call since your the one that's gonna have to drive it though.

Shift kit and servos is definantly a good idea. Just be conservative with the shift kit though. If you do the install, don't use the spacers in the servo assembly. They are not ment for a new tranny.

THere are only 2 sets of servos, an intermediate (1-2) and an overdrive servo (3-4). The servos do nothing but apply the band to the drum. Since the band is only applied in 2 and 4, that's the only servos you need. I would go with the billet servos just because they are bigger and have more holding power, and you need all that you can with that heavy of a truck and that much power.

 

do you have edit?

 

No, I do not have Edit. I was considering doing these installs and then getting the vehicle tuned by a competent shop. It's not like I will be doing anything else after I do the drivetrain mods, so I am thinking Edit will be wasted on me. Also, I've heard that Edit is not that useful without a wideband O2 and some other tool (the "holy trinity" I've heard it called), so I'm not sure I'm into learning three new tools for maybe a one-time or two-time deal.

 

i would get some tuning done. might be better than a TC. a yank will help you in the first 100ft of a complete stop, but that is about it. at crusing speed it is pretty useless. i take that back, it does keep your RPM's higher b/w shifts. a TC won't improve towing, it is pretty much there to help you win a race from a complete stop at a traffic light, or just to have fun feeling you weight push back on the driver's seat

 

A high stall converter makes driving in traffic MUCH better too. No more gettin stuck at 1900rpms in 2nd gear. That gear split is just so big between 1 and 2 the looser converter will alleviate a lot of that.

Also gives better shift extension on upshifts

 

What HitMan said ... That 2600 in my z71 made in town driving a lot more fun and sportier feeling. It did close that gap up considerably between 1st and 2nd.