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Old 10-29-2019, 12:13 PM   #1
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1981 24' Airstream 240
96703 , California
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Airstream 310 Transmission repair of upgrade

I have a 1982 310 that I just put a new long block in
recently after that my reverse went out
Is it best to rebuild this one or upgrade to a better one? Is there a 4 speed option?

Thanks
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Old 10-29-2019, 01:36 PM   #2
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1983 31' Airstream310
Hillsburgh , Ontario
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Please post what engine you have; 454 or Isuzu 6bd1.

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Old 10-29-2019, 02:23 PM   #3
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1981 24' Airstream 240
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its a chevy 454 by the way

original chevy 454 equipment
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Old 10-29-2019, 02:49 PM   #4
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you more than likely have a Turbohydramatic 400 transmission. They have an excellent reputation as a heavy duty trans. Get your current one rebuilt or better yet have a "Jasper" remanufactured unit installed. Jasper is the absolute best. Make sure you get a new Torque Convertor also. Have them flush all the fluid out of the coolant lines including thee trans cooler.
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Old 10-29-2019, 03:11 PM   #5
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1975 20' Argosy 20
Chestfield , Kent
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It will be a TH475, the TH400 with straight cut gears.

In terms of 4 speed, avoid the 700R4 unless upgraded, which only leaves the 'E' boxes that require electric controllers, and often trigger a decision to go all electronic, ie fit fuel injection as well as the 4 speed, although Chevy performance do a stand alone 4L85E box and controller.

Easiest upgrade is a GearVendor overdrive.
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Old 10-29-2019, 03:19 PM   #6
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Overdrive

Great suggestion on the "Gear Vender" overdrive unit. I had totally forgotten about what a really nice substitution when sticking with the original style TH475 and wanting to slow the revs on that 454. Great idea.
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Old 10-29-2019, 04:35 PM   #7
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1982 28' Airstream 280
Port Angeles , Washington
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For all those who insist Airstream only used the TH475 here is a sheet from the Airstream manual calling it a TH400.

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I had mine rebuilt many years ago and this is a list of upgrade parts used. I had the occasion to show this to an old timer at another shop. After looking it over his only comment was, "This guy knows his stuff." Feel free to show it to your trans guy.

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I agree 100% on the Gear Vendors overdrive. Cuts down the engine roar big time.
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Old 10-29-2019, 05:06 PM   #8
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Supposedly my TH475 was rebuilt and hot rodded at an Allison transmission shop. The upside of the venerable 475 is that parts are cheap and they're easily rebuild compared to an Allison.

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Old 10-30-2019, 09:45 PM   #9
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1978 28' Argosy 28
HOOKSTOWN , Minnesota
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Have Argosy 28 ft with 454. just received my Gear Vendor OD today. Look forward to installing this week. Looked at 4L80E but needed to add electronics to make it work. 454 very simple, GM HEi,and Edelbrock carb. Starts and runs great.
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