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View Full Version : Transmission: The "mystery" Avanti trans control plate...........



Hawklover
10-29-2017, 02:12 PM
So the Avanti parts book lists p/n 1556327 which is a trans control cover plate for 3&4 speed Avantis before s/n 4849.
My question, what purpose does this plate serve? It seems that after s/n 4849 this plate was not used, why not?... if it was necessary before that s/n? My Avanti has the plate and is after the aforementioned s/n.

Maybe Bez can "weigh' in???

bezhawk
10-29-2017, 05:17 PM
I don't have the book in front of me. Are you talking about the hole cover plate on the passenger side console? Those are access for the powershift rear band adjustment. Now you got me curious, and I'll have to look it up out in the shop.

bezhawk
10-29-2017, 06:05 PM
Ok, so I see it is the metal plate under the shifter console upholstered fiberglass cover. I will look on some later cars, they may have done away with it and made the fiberglass thicker, and deemed it unnecessary.

Hawklover
10-29-2017, 06:10 PM
I don't have the book in front of me. Are you talking about the hole cover plate on the passenger side console? Those are access for the powershift rear band adjustment. Now you got me curious, and I'll have to look it up out in the shop.

Page 206 illustration 2138-34

Hawklover
10-29-2017, 06:12 PM
Seems odd they would put one in on my car if as you say the fibreglass was made thicker........but the main question is....what purpose does it serve?......maybe to keep road noise down???
Ok, so I see it is the metal plate under the shifter console upholstered fiberglass cover. I will look on some later cars, they may have done away with it and made the fiberglass thicker, and deemed it unnecessary.

Hawklover
10-29-2017, 06:30 PM
Another thought Bez,........if I removed that plate what would be the resultant effect??

WCP
10-29-2017, 07:30 PM
The plate provides a positive seal against engine fumes/smell in the cab - a gasket must be used.

Hawklover
10-29-2017, 11:11 PM
The plate provides a positive seal against engine fumes/smell in the cab - a gasket must be used.

If that is true, then why did Studebaker do away with it after that s/n???
My car also has the gasket.

Ron Strasser
10-30-2017, 09:55 AM
At the same time they also changed the part number for the shift boot. Need someone with a 4 speed Avanti after SN 4849 to check and see what
Studebaker did. The gasket is listed for all
Ron

Mike
11-01-2017, 08:50 PM
Could the elimination of the plate correspond to the addition of the fresh air cooling hoses that were added to '64's? With them, air probably flows out of the console to the underside of the car. Where was the plate, on cars that had them? Would it have blocked air flow?
When I got my '64, [Made Oct. '63. ser#5xxx, with cooling hoses], it had a new shift boot. Oddly, there was also a new gasket loose "under there", but no sign of the plate. I don't remember any place for the plate, either. I think the previous owner bought the gasket with the boot because it was in the parts book; and didn't know what to do with it! It now resides in a box with some other spare parts. It will probably last longer there.
If someone has the service letter about retro fitting the cooling hoses to early cars handy, does it mention removing the plate?
Mike M


At the same time they also changed the part number for the shift boot. Need someone with a 4 speed Avanti after SN 4849 to check and see what
Studebaker did. The gasket is listed for all
Ron

Hawklover
11-02-2017, 01:20 PM
The plate went on the top of the gasket, then the fiberglass, look on page 206 of the parts book to see it. console cover finished off the interior.
Could the elimination of the plate correspond to the addition of the fresh air cooling hoses that were added to '64's? With them, air probably flows out of the console to the underside of the car. Where was the plate, on cars that had them? Would it have blocked air flow?
When I got my '64, [Made Oct. '63. ser#5xxx, with cooling hoses], it had a new shift boot. Oddly, there was also a new gasket loose "under there", but no sign of the plate. I don't remember any place for the plate, either. I think the previous owner bought the gasket with the boot because it was in the parts book; and didn't know what to do with it! It now resides in a box with some other spare parts. It will probably last longer there.
If someone has the service letter about retro fitting the cooling hoses to early cars handy, does it mention removing the plate?
Mike M

Mike
11-03-2017, 06:52 AM
The plate went on the top of the gasket, then the fiberglass, look on page 206 of the parts book to see it. console cover finished off the interior.
I can't tell from the drawing in the parts book how much space there would be between the console cover and the plate. If the plate was supposed to somewhat close off the underside of the car from the console, it would block the air exhausting the console around the shifter, which it was supposed to cool. A considerable amount of air is blown into that area and has to go somewhere. You wouldn't it leaking into the interior.
Mike

Hawklover
11-05-2017, 09:07 AM
Those cooling tubes were only on cars with no air conditioning, all cars built with a/c had no tubes.
I can't tell from the drawing in the parts book how much space there would be between the console cover and the plate. If the plate was supposed to somewhat close off the underside of the car from the console, it would block the air exhausting the console around the shifter, which it was supposed to cool. A considerable amount of air is blown into that area and has to go somewhere. You wouldn't it leaking into the interior.
Mike

WCP
11-07-2017, 06:13 PM
The attached photo should put to rest the question as to whether all 63/64 Avantis had the console shifter sealing plate and gasket. All Avantis with the auxiliary cowl vent should have the hoses that exit below the shift mechanism regardless of A/C or not. This is the 2nd last Avanti and the plate, gasket and hoses are clearly visible.

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