its $17 at my Advance Auto. I think im going there now to get one

The valve inline with the oem vac modulator can only adjust the shifts so far. Adjusting an adjustible vac modulator actually moves the valve in the modulator to change pressure.
In other words, you can't make your car shift harder at wot with a valve in line with the oem modulator. You can make it shift harder at lighter load though.

I found this to be true on my work commute today.

Is this what you guys are talking about??

DB, that'* a modulator. But from that pic, I have no way of knowing if it'* adjustable or not. Just remember, from a performance standpoint, all it does is firm up the shifts.

yes I under stand that is all it does

If it'* adjustable, it'll have a small screw inside for adjustment. There'* no way to tell unless it'* listed as adjustable and has the screw.

Advance does carry the modulator.

It'* made by pro-king, the part number is MD28 (it comes in the same packaging that Bandit posted, if you look at the pics he posted by the barcode, it even says "MD-28")

The pic that DB208508 posted is correct with regards to the stock photo on advance'* website.

they're $17.48 at advance.

I have purchased 3 of them, and all 3 have worked great.

that looks like the Pic form Advance so yes thats the right one.

Its the same one i just got.

Heres my thread for Moe Info and Better pics

http://www.bonnevilleclub.com/forum/...ic.php?t=71379

So that'* what that little screw inside the modulator on my Firebird'* THM 350 is for.

What direction do you turn to firm up the shifts.....clockwise or counterclockwise :?: