Hey guys,

2002 Z28 A4 3.23 gears (GU5) Lid and GMMG Catback are current mods.

I'm waiting on the new LPP headers due out in about a month and I want to do a converter when I do the headers. That way should be able to get the tranny tuned for the converter at the same time I get the headers/tune.

I know this is probably in the wrong section, but converter selection seems to be very dependent upon the engine (due to peak torque rpms). So looking for LS1 experience here.

Anyhow, I can't decide between the SS3600 or the SS4000. This is not a daily driver. Just a weekend warrior / limited track currently.

Here's how they stack up:

SS3600
2.5str
Shift Extensions (~4,800rpm on a bolt on car)

SS4000
2.6str
Shift Extensions (~5,200rpm on a bolt on car)

Anybody have experience with both? I'd rather not change the stock shift points and limiter until I cam it, but that won't be until this winter. Going with the F14 High Lift at that point.

Just looking for input from some guys that might have had experience with either of these converters. Thanks.

 

If this is not primarily a daily driven street car, completely forget about Yanks SS series converters, unless you plan on forced induction or nitrous. The PT4000 works very well for nearly any naturally aspirated combo, with the PT4400 being oriented more towards a track only car. Go with the PT4000, the street feel is much better than a SS3600 and the performance difference is incredible! AND, the PT4000 will work perfectly with that F14 you are looking at.

 

4000

 

I've looked at the PT4000 as they have a little softer str (2.2 i believe) so i've been told you can roll into those on the street and get 'some' traction versus the SS series which just melt the tires. Also the PT series pull like a raped ape on a roll. Can't spray though, but this car only has 37k on it; i'd rather not blow the engine the 1st year I have it.

But i'm afraid of the shift extensions on the PT4000 being too high until I get a cam... maybe with stock power they would be a little lower...

 

You're right about the top end and shift extension on the PT converters, but the PT also hits much harder than the SS. Numerous local guys have run the PT converter on bolt-on or mild cammed cars with lots of success. Shift extension actually varies much like stall speed does when the torque input changes. It will work, just do it

Finally, if you dont mind spinning the engine to 6800-7000rpm, the PT4000 will take a small shot without blowing through.