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How a properly working hydramatic shifts, Turn volume up

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Uploaded by on Oct 21, 2007

In this video driving slow it shifts at 10, 20, and 35 mph
1st to 2nd you cant barley feel or hear about 10 mph.
2nd to 3rd A harsh shift (about 20 to 35 mph), This is normal & you will definatly feel this.
3rd to 4th (about 35 to 50 mph) you cant barley feel or hear.

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Autos & Vehicles

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Uploader Comments (thebig429)

  • yes Jason

  • Binghamton NY

  • I would guess this is a dual coupling Hydramatic.

  • That is correct.

  • In this video driving slow it shifts at 10, 20, and 35 mph

    1st to 2nd you cant barley feel or hear about 10 mph.

    2nd to 3rd A harsh shift (about 20 to 35 mph), This is normal & you will definatly feel this.

    3rd to 4th (about 35 to 50 mph) you cant barley feel or hear

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All Comments (10)

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  • is this the ndslr one?

  • That 2nd to 3rd shift should not be harsh. You should definitely feel it a lot more than the 1st to 2nd or the 3rd to 4th shifts, so it will be more positive, but not harsh, except maybe under hard acceleration.

  • That's a '64 with the last of the Dual Coupline Hydra-Matics, I'll bet. You can modify the coupling fill-drain rates to make 1-2 and 3-4 "firmer" and have less slippage, but it's a BIG job.

  • Greetings, where in NY are you? I have a 62 Starfire convert, and I am looking for a local "slim jim" expert to rebuild my unit. Any Info?

    Thank you

  • hey bud my car originally came with the slim jim,rather strange shifting tranny if your used to a turbo 400,and yes my tranny never came in a gp, i had to modify the tranny hump a bit,wasnt this also called a super hydro matic?

  • The G.P. has the Roto (Slim Jim). Its a different tranny then the 4 speed used in Caddys and in Bonevilles..

    The Slim Jim will go like hell when it wants too. I had one with a 421.

  • my old 63 grand prix has this tranny ,been rebuilt along time ago by a drag racer,this thing squeels the tires from second to third

  • thanks for posting this

    i have a 61 6 window and was pretty concerned about that hard shift

    good to know its supposed to be like that

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