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ID Auto Tranny Part? Vacuum Part?
I can't seem to find the part that connects to the vacuum line at the tranny. Vacuum Modulator?
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1981 Porsche 928 "Euro" Auto Gunsmoke Metallic Flat - Black Interior 1983 Porsche 928S "US" Auto Light Bronze (Copper) Metallic - Brown Interior **SOLD** 
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03-19-2009, 07:14 PM
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Registered
Join Date: Jun 2007
Location: Simpsonville, SC
Posts: 182
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if you have the PET diagram, look at illustration 308-55. I think its the pressure control valve #26, Depending on your tranny, either 126 270 257 9, or 126 270 937 9.
Of course, double check to make sure I am correct...
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Chris 86.5 928 Indy Red/Black, A/T, 118,456 miles and counting |
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03-19-2009, 07:52 PM
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Network Native
Join Date: Jan 2007
Location: SoCal
Posts: 10,349
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Here is a diagram c/o DC auto.
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03-19-2009, 08:14 PM
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I am looking at PET and don't see a 308-55, mine only goes to 308-10 then 309. I have a 1981 3 speed. Am I using PET incorrectly?
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1981 Porsche 928 "Euro" Auto Gunsmoke Metallic Flat - Black Interior 1983 Porsche 928S "US" Auto Light Bronze (Copper) Metallic - Brown Interior **SOLD**
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03-19-2009, 08:33 PM
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Network Native
Join Date: Jan 2007
Location: SoCal
Posts: 10,349
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Hmmm, my diagram was from a 4 spd apparently.
928 (1983-1986) (A28.01/04) but what about a http://www.pelicanparts.com/cgi-bin/smart/more_info.cgi?pn=OEM-1232700079&catalog_description=Genuine%20Porsche%20Part%3A%20 TRANS.DIAPHRAGM |
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03-19-2009, 10:48 PM
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MPDano- here is a scan from a "82" MY service manual. I have more info on shift point adjustments if you are interested. Hope this helps.
John 
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03-20-2009, 04:47 PM
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Registered
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Sorry about the first post, wrong pic!
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03-20-2009, 04:48 PM
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icy-hot, that's it. Do you know where this is in PET or a part number?
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1981 Porsche 928 "Euro" Auto Gunsmoke Metallic Flat - Black Interior 1983 Porsche 928S "US" Auto Light Bronze (Copper) Metallic - Brown Interior **SOLD**
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03-20-2009, 08:14 PM
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Network Native
Join Date: Jan 2007
Location: SoCal
Posts: 10,349
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Another diagram.
18 1002703307 Hydraulic control unit for control pressure with regulating valve A22.01/02 $186.80 (18) 7222701007X Regulating valve 82 A22.04 $175.06 http://dcauto.gotdns.com/illustration/index/61730806 
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03-21-2009, 12:39 AM
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I actually plugged the vacuum line that goes to this modulator and I like the shifting better. Before it was very mushy, it shifts better now. Is this bad to not use this vacuum modulator? Also, I can still hear some sort of vacuum when I accelerate, so this is not the source.
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1981 Porsche 928 "Euro" Auto Gunsmoke Metallic Flat - Black Interior 1983 Porsche 928S "US" Auto Light Bronze (Copper) Metallic - Brown Interior **SOLD**
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03-21-2009, 11:35 PM
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24 karat
