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Old 05-30-2007, 09:23 PM
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1961 hydromatic help

i have a 1961 Oldsmobile with a 394ic v8 and a hydromatic trans when im just cruse'n and it goes to change up the revs drop/ studder then it changes. iwas told by a friend i need a new torque converter. i wanted to know what torque converters will fit it?
thank you
miles

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Old 05-30-2007, 09:46 PM
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Your hydro doesn't have a torque converter. It has a fluid coupling. Sounds like internal problems either in the friction material or the valving.
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Old 05-30-2007, 10:00 PM
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1961 hydro_madic

thanks for that-so im guessing the only thing for it is a rebuild?
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Old 05-30-2007, 10:33 PM
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Quote:
Originally Posted by rocketman61
i have a 1961 Oldsmobile with a 394ic v8 and a hydromatic trans when im just cruse'n and it goes to change up the revs drop/ studder then it changes. i was told by a friend i need a new torque converter. i wanted to know what torque converters will fit it?
thank you
miles
I believe you have a model 10 roto hydramatic....... often called a Slim Jim

Your tranny may be shifting correctly..... these units did not shift in the same manner as more modern trannys .

I ran around with a friend in high school with a 62 Olds Starfire with 394 engine that had one of these old trannys . It shifted as you describe
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Old 07-25-2007, 08:35 PM
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I would swap in the 400 Turbo. The Slimjim is trouble.
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Old 07-25-2007, 08:54 PM
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Originally Posted by pitts64
I would swap in the 400 Turbo. The Slimjim is trouble.

that would require an expensive adapter for the t-400 to fit a 394 Olds motor
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Old 07-26-2007, 06:30 AM
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slimjim

I believe Crosley is correct, as best as I remember [ this being a slimjim and working correctly ].

Later today I will call the man that taught me my trade [ he's a much older trans rebuilder, now retired] and I'll check with him about this.

And of course will post his info.
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Old 07-26-2007, 07:56 AM
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The price of the adapter is well worth it for the benefit of having the Turbo 400. The Turbo 400 takes a block mounted starter.
I would contact Wilcap and have one made.
http://www.wilcap.com/webdoc8.html

I've had cars (63 Olds 88, 64 Catalina and 421 Grand Prix) with Slim-Jims and all that transmission was good for was making transmission shops rich. Besides have you looked at the price to rebuild a slim-jim? There's no other way to go.
A friend recently put a working slim jim behind a healthy Pontiac 462 just for kicks. It lasted about 100 miles. He is putting the much stronger 4 speed Super Hydromatic in his Catalina now.
I have a 64 Bonneville with a stout 462 with a 64 Jetaway 4 speed hydro and its a fantastic combo. I wouldn't want any other tranny. The 4 speed hydro with its 3.97 first coupled with a 2.56 posi is a fantastic street combo.
I also like cruising at 65 mph @ 2100 rpm.
I'm getting ready to install a governor from a 60 Pontiac Tri-Power 389 to extend the rpm range.
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Last edited by pitts64; 07-26-2007 at 08:11 AM.
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