| Transmission Pressure Port Location [message #289486] |
Mon, 26 October 2015 20:49  |
George Beckman
Messages: 1085
Registered: October 2008
Location: Colfax, CA
Karma: 11
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Senior Member |
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I have been searching the net and the manuals and other than it being on the driver's side of the transmission I am not positive where the port for checking transmission pressure is located.. Before I put the coach on the jack stands and crawl under there I also would like to confirm that it is a 1/8th" plug, perhaps above and slightly forward the shift shaft.
'74 Eleganza, SE, Howell + EBL
Best Wishes,
George
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| Re: [GMCnet] Transmission Pressure Port Location [message #289491 is a reply to message #289486] |
Mon, 26 October 2015 23:00  |
powerjon
Messages: 2446
Registered: January 2004
Karma: 5
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Senior Member |
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Yes, it is there, about 4” rear of the shift arm shaft and about an inch or so from the back edge of the transmission. The 425 tranny layout is reverse of the 400 transmission. Or to say it differently what is on the pass side front on the 400 is on the drivers side rear on the 425 transmission. Get your maintenance manual and go to Section 7, page 9 and review fig 10. You will see the small plug in the lower middle of the picture. It is a 1/8” plug.
JR Wright
78 Buskirk Stretch
75 Avion
Michigan
> On Oct 26, 2015, at 9:49 PM, George Beckman wrote:
>
> I have been searching the net and the manuals and other than it being on the driver's side of the transmission I am not positive where the port for
> checking transmission pressure is located.. Before I put the coach on the jack stands and crawl under there I also would like to confirm that it is a
> 1/8th" plug, perhaps above and slightly forward the shift shaft.
> --
> '74 Eleganza, SE, Howell + EBL
> Best Wishes,
> George
>
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J.R. Wright
GMC GreatLaker
GMC Eastern States
GMCMI
78 30' Buskirk Stretch
75 Avion Under Reconstruction
Michigan
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| Re: [GMCnet] Transmission Pressure Port Location [message #289512 is a reply to message #289491] |
Tue, 27 October 2015 10:47 |
George Beckman
Messages: 1085
Registered: October 2008
Location: Colfax, CA
Karma: 11
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Senior Member |
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powerjon wrote on Mon, 26 October 2015 21:00Yes, it is there, about 4" rear of the shift arm shaft and about an inch or so from the back edge of the transmission. The 425 tranny layout is reverse of the 400 transmission. Or to say it differently what is on the pass side front on the 400 is on the drivers side rear on the 425 transmission. Get your maintenance manual and go to Section 7, page 9 and review fig 10. You will see the small plug in the lower middle of the picture. It is a 1/8" plug.
Thanks, Jon.
'74 Eleganza, SE, Howell + EBL
Best Wishes,
George
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