High HP and AUTO trans

[ilian51378]

Old thread, but I need the info... I am planning on installing 19Ts on my ATX AWD GTO and wanted to know if the tranny would hold up for daily driving. I am not going to go to the drag strip and abuse it. The only thing I have done to the trans is a cooler from IPT - I got the biggest one. I also bought an end clutch kit, just in case mine craps out. I plan on running about 8psi of boost for now, but I might decide to go up one day if that would be safe for the tranny. I have had the turbos on the car for the past four months with no issues. I have also installed paddle shifters. What do you guys think?

[familyMAN]

I was advised to install a trans lab shift kit also. $50-60ish off ebay. That is supposed to be great for increased reliability and shifting of course. Then for racing, do the blue wire/kiggly mod for full line pressure shifts. (I'm going with a shift box since I don't have a TCU like you.)

[IPD]

My w4a33 shit the bed. Not too surprised, since it was used when i installed it, but i got a solid couple years out of it. Shooter has my old rebuilt FWD trans--I hope it's still going strong.

I'm still looking for a shop to do the work, but the list of what i'm contemplating:

-clutch packs
-end clutch kit
-translab shift kit
-jacks spider center differential (rated for up to ~600awhp--welded is recommend above that)
-precision industries 2500rpm stall converter
-larger/thicker trans cooler
-(undecided) Quaife front LSD

I'm hoping I can find a shop that will do all the labor for under a grand.

[ilian51378]

I was advised to install a trans lab shift kit also. $50-60ish off ebay. That is supposed to be great for increased reliability and shifting of course. Then for racing, do the blue wire/kiggly mod for full line pressure shifts. (I'm going with a shift box since I don't have a TCU like you.)

I have a shift box in my car that I can use as a stand alone or with the TCU. I have a switch that lets me use the trans in an auto or manual mode. The shift box always does full line pressure shifts.

[ilian51378]

My w4a33 shit the bed. Not too surprised, since it was used when i installed it, but i got a solid couple years out of it. Shooter has my old rebuilt FWD trans--I hope it's still going strong.

I'm still looking for a shop to do the work, but the list of what i'm contemplating:

-clutch packs
-end clutch kit
-translab shift kit
-jacks spider center differential (rated for up to ~600awhp--welded is recommend above that)
-precision industries 2500rpm stall converter
-larger/thicker trans cooler
-(undecided) Quaife front LSD

I'm hoping I can find a shop that will do all the labor for under a grand.

How much HP did you run it with?

[IPD]

On my existing setup? It's probably around 250awhp. I think a stock ATX is plenty strong to handle that. A used ATX, like mine, you can't ever tell. People do stupid shit like neutral-drops in these cars....because regarded stick-shift fanboi. If you have a tip-top stock ATX & a cooler, I wouldn't worry about it until well past the 300awhp mark.

[familyMAN]

Other site has a dr650 car running 10's on bone stock auto from a jdm importer. Didn't even change the filter. Just full line pressure with toggle shifting.

[ilian51378]

Other site has a dr650 car running 10's on bone stock auto from a jdm importer. Didn't even change the filter. Just full line pressure with toggle shifting.

Okay, I will get a pair of 19Ts and hope all works out fine...

[thor'svr4]

No, the 3S AEM does not do ATX control.
IPT sucks (IMO)
Get the TC restalled and brazed at Hughes in AZ. They are the shit.
Run full ine pressure and use 2 toggles to shift thru the 4 gears.
The input shaft will snap at high HP hard shifts. 500HP and under shouldn't be an issue

-Chris

Is there any way at all to get an AWD ATX to handle higher hp for extended periods of time? Ive been told the OD shaft (?) and input shaft are weak but is there nothing us AWD guys can do for 500+ awhp daily drivers? any 300M versions of the shafts available? or awd DSM tranny that might hold?

I would love nothing more than to have an AWD ATX tranny with a high stall converter, manual valve body (or shift box/switches) and a transbrake. I even tried looking up nelsons tranny setup but i think hes running some shep dsm tranny and shep apparently isnt doing dsm's anymore... im guessing im SOL.

[familyMAN]

The awd DSM internals and our internals are EXACTLY the same. With full line pressure 1,2,3 gears will handle 500awhp no problem. The only issue is WOT shifting into OD. That's why Nelson has his car set up to rev so he can rev out 3rd gear. Many 500awhp and under OD is even fine.

If you want to upgrade... trans lab shift kit and end clutch upgrade. Maybe main clutch kit too. None of that is expensive and IPT has YouTube vids online.