Its a single vac tube that would go into your car through the firewall to the vac bleeder. I had the unit on my L36, its only good during normal driving . At WOT there is no vac on N/A 3800s so it doesnt help at WOT.


For the 4t65e you can get a replacement spring shift kit. You drop the pan undo the accuator pull it out, pull out the inner springs , swap with the new ones at your setting(low med high) place spacers on the piston shaft and install. Takes abour 1.5 hours.

Welcome to the forum, Pman! Put your year and model in your sig. I get the impression you should show off your mods, too

Check into the gatherings section as well. There'* a few people in the MI vicinity.

Thanx
Why would i want to do that



BTW: I am unsure of how the trans vac control is on the L67/4t60e setup BUT if it has a vac line coming from the TB then try running boost from your SC to the vac mod. That will increase your shifts better then the B&M shiftplus. Since the trans shifts harder with less vac, running boost will increase your line pressure a tad more.

I am told by some that it is not a worthy swap but you can also buy a custom modulator so you can dial in your own shift firmness on the 4t60-e/4t60.

I heard bad things about the Auto Trans Interceptor module. I will put up some links about this.

As usual I have the modulator that I am talking about and yes it works but compared to the Thrasher shift kit for the 4t65-e its no big deal.

I am going to send one to a friend of mine to use inline with the B&M system and alone.

I now offer a limited slip for the 4t60-e. It is $500.00.

Ty
Domestic Performance