Gary98Z

iTrader: (9)

How much better is having vacuum modulated shifts rather than computer controlled? I'm not pushing that much power, but someday I may upgrade to a stroker (currently have heads/cam). I'm trying to decide which built tranny to go with and if I should opt for this.

Thanks.

Gary

RPM WS6

iTrader: (3)

I would never buy a "built" 4L60E that was not vacuum modulated. I am spoiled now that I have it. Biggest difference I noticed was the lightening quick downshift response vs stock; also seems to upshift a lot quicker at WOT.

Also, many people have had issues with the PCM not supplying proper line pressure thus causing premature wear issues. The vacuum control removes this problem.

WILWAXU

iTrader: (6)

What he said

Once you go vacuum, you'll never go back

Jorday

I agree. I like my vacuum modulated setup a lot.

kevinb

So what is involved in converting over to the vacuum modulated shifting?

RPM WS6

iTrader: (3)

Well, as far as I know, swapping out the electric pressure control solenoid with the vacuum controlled one, and machining the case for the vacuum input (line). Then usually they run a T fitting into the brake booster line to feed vacuum input into the trans. Not sure what else they do....

Gary98Z

iTrader: (9)

Wow...I didn't know vacuum would make that much of a difference. Thanks for the input.

JS

iTrader: (4)

If I did it again I'd opt for a TCI Trans Com and control the shifts threw it.
Plus u can set LU and shift firmness too along with many other features.

We have one in a customers 11.70 LT1 car and it works FLAWLESSLY.

jimmyblue

iTrader: (11)

Looks like a nice capability in that TCI unit,
but day-um! $800? Edit needs a couple more
transmission "*****" is all.

JS

iTrader: (4)

Edit is NOT remotely as good a a T-Com...The way it controls the trans is much more superior.I've seen trannys do strange things with EDIT but have NEVER seen a T-Com not shift or LU a trans exactly where u set it at bro.

I've had it so I'm speaking from experience....