ADJUST YOUR SHIFT PRESSURE FOR LESS THAN $4 - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

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Old 02-04-2007, 04:25 PM   #11
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its $17 at my Advance Auto. I think im going there now to get one
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Old 02-05-2007, 08:41 PM   #12
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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.
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Old 02-05-2007, 09:51 PM   #13
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Quote:
Originally Posted by 95naSTA
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.
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Old 02-06-2007, 06:32 AM   #14
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Is this what you guys are talking about??


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Old 02-06-2007, 09:17 AM   #15
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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.
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Old 02-06-2007, 10:03 AM   #16
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yes I under stand that is all it does
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Old 02-06-2007, 10:04 AM   #17
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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.
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Old 02-06-2007, 03:21 PM   #18
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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.
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Old 02-06-2007, 04:48 PM   #19
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Quote:
Originally Posted by willwren
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.
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
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Old 02-07-2007, 12:00 AM   #20
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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
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