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Old 11-22-2018, 12:55 PM   #1
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1986 34.5' Airstream 345
Clamensane , PACA
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Smile Transmission issues

Hello everybody !

A new difficult came out, i have to change this piece and i don't even know the name of that
it's on the left side of the carter of the gear box

If everyone know I'll be happy to have a little help !

Thank a lot

ps : i found those on R-A is that it ? governor/modulator

https://www.rockauto.com/en/catalog/...modulator,8500
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Old 11-23-2018, 12:41 AM   #2
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Hi, vacuum modulator.
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Old 11-23-2018, 01:57 AM   #3
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Make sure you are getting good vacuum from the inlet manifold to the modulator before changing the modulator....if not even a new part will not work.

On Bella, I found a crack in a T-piece just under the carb, that was preventing vacuum opening the modulator and so not changing gear.
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Old 11-23-2018, 07:38 AM   #4
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1986 34.5' Airstream 345
Clamensane , PACA
Join Date: May 2018
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transmission issues

Thanks to guys !!

is this the vacuum ?
https://www.rockauto.com/en/catalog/...um+switch,4604
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Old 11-24-2018, 08:43 PM   #5
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1986 34.5' Airstream 345
Clamensane , PACA
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transmission issues

How i could know witch model i have to choose ? there is a serial number or something i can find somewhere ?

My gear box is not usual on the 345, it's an Allison 4 gear and the airstream is from 1985.
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Old 11-24-2018, 09:03 PM   #6
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1975 20' Argosy 20
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If the transmission is not standard then searching on RockAuto, Napa etc is more difficult. You need the actual transmission model. For example this is for a AT540 (https://www.ebay.co.uk/itm/New-Allis...4VfO:rk:1:pf:0) but it depends which model you have.
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Old 11-24-2018, 10:25 PM   #7
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1986 34.5' Airstream 345
Clamensane , PACA
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transmission issues

Yes i know, but it's exactly the problem i know it's allison gear box 4 gear but i don't know the model, is anyone know here witch model it can be ?
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Old 11-25-2018, 12:12 AM   #8
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My 1987 345 has an Allison AT545 with a Cummins diesel witch doesn't mean much for your coach other then that Airstream did use that model. If you can find the tag on the trans you would know for sure.
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