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Old 10-26-2005, 11:25 AM
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Slim Jims

I just wondered if ANYONE knew about the old Oldsmobile Slim Jim Transmissions made from 1961-1964. I remember hearing about some place in Ohio that rebuilt them and said they could be better than the old 4 speed hydros for racing. I don't know anything about them except for having one in my 1962 Olds 98. Steve Andrews Fort Wayne IN.

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Old 10-26-2005, 07:25 PM
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Quote:
Originally Posted by VA46CLANSMEN
I just wondered if ANYONE knew about the old Oldsmobile Slim Jim Transmissions made from 1961-1964. I remember hearing about some place in Ohio that rebuilt them and said they could be better than the old 4 speed hydros for racing. I don't know anything about them except for having one in my 1962 Olds 98. Steve Andrews Fort Wayne IN.

there were two of them. A model 5 and model 10.

Performance wise , I have never heard of them being used for performance use.
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Old 10-26-2005, 08:13 PM
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I've never heard of them and that is likely because they were not performance material. Powerglides, TH 350, TH400, Ford C4 and C6, Chrysler 747s, all are popular because they lend themselves to performance applications with relatively minimal work and cost. Other lesser known models like the Slim Jim and the post Dual-Range Hydramatics died a quiet death because they did not. Dual Range Hydros had many shortcomings, mainly in the sophistication of the control system, but strength was not one of them. After all these things were originally developed to serve in high powered military tanks!
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Old 10-26-2005, 09:48 PM
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Originally Posted by willys36@aol.com
I've never heard of them and that is likely because they were not performance material. Powerglides, TH 350, TH400, Ford C4 and C6, Chrysler 747s, all are popular because they lend themselves to performance applications with relatively minimal work and cost. Other lesser known models like the Slim Jim and the post Dual-Range Hydramatics died a quiet death because they did not. Dual Range Hydros had many shortcomings, mainly in the sophistication of the control system, but strength was not one of them. After all these things were originally developed to serve in high powered military tanks!
hmmmm, 747 mopar tranny?


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Old 10-26-2005, 11:11 PM
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Whatever. Advanced Partzheimer's and never working on a Mopar tranny is a dangerous combo! I know there is some airplane # in there somewhere.
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Old 10-27-2005, 02:26 AM
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Had a friend in college with a 62 Pontiac Grand prix. These had the slim jim in them also. A VERY fragile trans.
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Old 10-27-2005, 06:14 AM
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Quote:
Originally Posted by BOBCRMAN@aol.com
Had a friend in college with a 62 Pontiac Grand prix. These had the slim jim in them also. A VERY fragile trans.

these slim jim trannys used a cone shaped friction in them, very similar to the setup used in the Gear vendors OD unit.

The gear vendors unit is waaay stronger though.

but you guys knew that.
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Old 10-27-2005, 08:26 AM
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Slim Jims

i'm very confused about the Slim jim Transmissions. I know that the early Oldsmobile engines where overbuild, when it came to strength. I think the 455 was weak, compare to a 394, with all of them having forged cranks and thick heads and clyinder walls. Why would Oldsmobile put a transmission behind a 440 ft pounds of torque engine that was so weak???? It makes no sense to me. Was it that they ran to hot, or was the parts inside prone to break. I heard that the valve bodies were changed about 20 times over a 3 year period. What were they thinking????
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Old 10-27-2005, 08:21 PM
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It isn't the first time a car company made a really big mistake. The 3 year run for that tranny is testimony enough I think! Need I mention the Caddy 8-6-4 engine?
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Old 10-27-2005, 09:44 PM
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Quote:
Originally Posted by VA46CLANSMEN
What were they thinking????
I often wonder that about the 4 cyl motor in the chevy Vega.

in 1964 the t-400 was introduced. Soon afterwards the other trannys were dropped.
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