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4+3 Transmission problem.

  
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4+3 Transmission problem.

 
krmiche krmiche
New User | Posts: 2 | Joined: 09/13
Posted: 09/08/13
09:38 AM

I am having trouble finding a place that sells the pressure switch that installs inside the transmission.  

waynep712222 waynep712222
User | Posts: 129 | Joined: 03/13
Posted: 09/08/13
10:10 AM

i see....

got a picture???

i am taking that yours failed either a pressure test.. or an electrical test during the pressure test...

**082730 SWITCH, PRESS O/D VLV BODY

i don't have a complete part number for it .. yet..


there are several doug nash 4+3 specialists out there that probably bought up all the parts out of GM inventory... which one.. or did who ever ran doug nash get them all...

i don't know wait..

i searched it out..

perhaps..


http://www.skspeed.com/corvette_transmission.aspx


Corvette

   Muncie, T-10’s - All years, parts available.
   All parts for the Doug Nash 4+3 transmission used in 1984-1986 2. Corvettes - Rebuilt units or any part for the T-10 4-speed and the overdrive unit.
   New Richmond 5+6-speed transmissions are available for Corvettes.


Call Brian at area code six hundred thirty one 957-9427  

waynep712222 waynep712222
User | Posts: 129 | Joined: 03/13
Posted: 09/08/13
10:15 AM

if you still cannot find it.. there are several automatic transmission control switches available..

i just don't know what yours looks like yet...

got a picture...

do you have the ability to use a pressure regulator and crank up the air pressure to see when the pressure diaphragm closes the contacts.. it could be anywhere from 5 psi to 80.. so try not to blow it out..

oil pressure switch sockets from the parts stores are what fits the odd shape of some of these switches..  

waynep712222 waynep712222
User | Posts: 129 | Joined: 03/13
Posted: 09/08/13
10:19 AM

hmm..
thats on ebay for 125..

1984-1988 4+3 overdrive pressure switch,NOS GM # 14082730

$(Kgrhqz,!Rie Pylnqb6bptgy8h0kw~~60 58

that switch marking says 20PSI60 hmm...


i see that on another site... that a jumper can be used across the mechanical second gear switch and make the overdrive stay on in all forward gears..  hmm...

about the only thing thats even close... is a wells
PS200   1/8-27 NPTF Dryseal  Normally open - Closes 28-32 PSI
thats a little higher than 20 psi.. and will probably screw up the shift feel..
and it will require a 1/8x1/4 NPT bushing reducer to install it.. i went thru one manufacturers complete list...

there are industrial suppliers that will have that switch available..

where to check...  newark electronics... grainger..  HOBBS switches... cherry switches.. or switchcraft.. but i don't know the circuitry inside.. does it close at 20 psi... does it open at 20.. .is only one lead or as i expect its isolated.. and closes one terminal to the other...

if you still have trouble.. come back and post here..


here is a manufacturer of similar switches...

http://www.wilspec.com/sites/wilspec/uploads/media/Spec_Sheets/Pressure_Switch_8_page_2013.pdf

looks almost like the same switch.. but they probably don't have any built..

would have to make a run of them after specs are selected...  

waynep712222 waynep712222
User | Posts: 129 | Joined: 03/13
Posted: 09/08/13
11:04 AM

one of parts stores sells this switch but its a higher pressure for air lift systems..

Air Lift/85 to 105 PSI pressure switch
Part Number: 24544

 

waynep712222 waynep712222
User | Posts: 129 | Joined: 03/13
Posted: 09/09/13
05:10 PM

be sure to let us know what you found.. find..

there are multiple parts manufacturers on this type of switch..  

waynep712222 waynep712222
User | Posts: 129 | Joined: 03/13
Posted: 09/09/13
05:53 PM

oops wrong thread to post this.  

Vetteoz89 Vetteoz89
New User | Posts: 3 | Joined: 11/13
Posted: 11/18/13
12:38 AM

Icon Quotewaynep712222:
"that switch marking says 20PSI60 hmm...
Normally open - Closes 28-32 PSI
thats a little higher than 20 psi.. and will probably screw up the shift feel.."


Shouldn't make any difference , it is only there as a safety device to ensure there is sufficient fluid pressure to operate the unit
If the pressure is too low it will not allow the ECM to try and engage the O/d  

Vetteoz89 Vetteoz89
New User | Posts: 3 | Joined: 11/13
Posted: 11/18/13
12:45 AM

Icon Quotewaynep712222:
"i see that on another site... that a jumper can be used across the mechanical second gear switch and make the overdrive stay on in all forward gears..  hmm..."

Depends on the year
1984 had 3 switches (1st, 2nd, and 4th ).
1985 , 1987, and 1988  had a 1st gear switch 19
86  had no switches.

In any case the power to the O/d still has to go through the pressure switch for the unit to engage