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Roto-Hydramatic 375 Also known as Model 10 or Slim Jim. Used 1961-64 in some Buick, Olds and Pontiac models. There is some disagreement as to this being a 3 or 4 speed transmission. It only shifted twice, so many people consider it a 3 speed, but it had an internal torus torque multiplier (similar in principle AND operation to today's torque converters) that did give it an initial additional "ratio". Do not confuse with 375 THM used later that was an adaptation of the 400 THM, but with a 350 THM size output shaft spline or the version of the 350 THM that GM called a 375 THM. This was an hydraulically controlled transmission. TV rod adjustment Disconnect rod, push (and hold) the gas pedal to the floor, push the TV rod (and hold it) until it bottoms in the valve body, adjust the length of the rod until it will just assemble back together.
Gear Ratios:
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(click on picture to enlarge) Click here to go to parts identification page Great News! I have acquired a SMALL quantity of NOS Slim Jim Model 10 filters! They have been sitting on a shelf in a closed transmission shop and have some slight cosmetic surface discoloration that will not affect their operation.
Sold OUT!
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