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Jonny88

Hydra-Matic Repair Help please

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Hi everybody. I have failed to mention this along time ago. My 51 Olds 88 has trouble shifting sometimes, it is a automatic and the fluid level is full. I have a feeling that the Bands either need adjustment or replaced all the way. Maybe you could help me out from my blunt description of the problem.

Sometimes the car just revs as if it was in neutral when starting in low gear, it takes a few moments to lock into low gear, Reverse works well, and drive works good, but when the car runs through the gears inbetween shifting, it will rev as if it was in neutral, after I let off the gas the car will shift to the next gear.

The more I drive it the better and once warmed up it tends to do a littile better and sometimes shift right into gear as it is suppose to, I need to buy some transmission cleaner or some sort of liquid helper that I can feed into the transmission. I know something is wrong and it will cost a good fortune to find a person to work on if there are any left.

Could any of you help me with what I could get to add to the Transmission fluid to help, a specialist close to Ohio if any, and what could be the problem with this transmission in general. Also when I change the positions on the colum, such as going from N to D, the car jolts forward but does not move, as if something is worn out, same case when I shift into R.

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hi jonny88, these are very good transmission, it sound like to me, what should be done first is, to have the old fluid drain, the torus member too (fluid coupling), have the pan drop, and have the sediments check, and clean up the pan and the pick up screen. new pan gasket and fluid. you won't need any tranny snake oil. what part of ohio are you in ?, charles coker, 1953 pontiac tech advisor.

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hi jonny88, these are very good transmission, it sound like to me, what should be done first is, to have the old fluid drain, the torus member too (fluid coupling), have the pan drop, and have the sediments check, and clean up the pan and the pick up screen. new pan gasket and fluid. you won't need any tranny snake oil. what part of ohio are you in ?, charles coker, 1953 pontiac tech advisor.

Agreed, do the fluid change first. Then check the TV rod adjustment for proper settings. It almost sounds like the TV rod is set too tight and is trying to "hunt" during the shifting process.

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d2willys, there's a newbie over on classicoldsmobile with a 61 88 who also has some questions. Told her you'd be a good resource on a Roto.

Though from her description the thing is acting about normally for a Slim Jim!

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Hey Pontiac1953 good to speak to you again, I am located in Hamilton, just a hour north of Cincinnati, Ohio. Thanks for your great help, I will try this first and let you know what happens, I hope this solves the problem, thanks.

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Linkage adjustment is critical, it really is, and any slop or play should be 1st order of business. You must understand the linkage first....then adjust slightly(or more-you can't likely hurt anything) to see what results you will get with a road test. Too much fluid? A problem also.

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If this was my trans I would check the fluid for being burnt, change the fluid, remove the pan and do the band adjustments. Check how much adjusting is required on the bands. Band adjustment is a REQUIRED service procedure which many people never do, but this adds to accelerated wear when they are out of adjustment. TV linkage adjustment is critical to operation & wear too. Take the valve body down and apart and check all the spool valves for operation and look for debris in the valve body. A final check for my own piece of mind is to do the fluid pressure checks.

These are all external trans in the car procedures. If the above dosen't get results it's time to pull it and get it apart.

D.

Edited by helfen (see edit history)

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helfen thank you for the detailed message, I will try everything you just described, I am very new at this, but have the Hydramatic service manual and the service manual for the car. hopefully I can do this, although I am thinking about taking it to a specialist, if I can find one here in Ohio.

Thanks, Jon

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Hi Jon, about the only thing that most people at home can't do is the hydraulic pressure testing (because most people don't have the gauges), but going by the service manual it is a easy task. If you decide to take it to someone make sure they are experienced with older hydramatic. You'll need to ask them if they know the difference between single or dual range or controlled coupling hydramatic's. If they don't know difference what your asking find someone else. What you don't need is on the job training.

Don

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The band adjustment is thru the floor and cut a hole unless someone beat you to it. Take heed to my first comment tho...comes from 1st hand experience, not general knowledge.

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The band adjustment is thru the floor and cut a hole unless someone beat you to it. Take heed to my first comment tho...comes from 1st hand experience, not general knowledge.

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Then you'll also know some "D" type Hydra Matic's are not external adjustable from the top. Just depends which one you have.;)

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Jonny88 traded his Olds for the Ford Fairlane currently shown in his avatar.

Paul

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Jonny88 traded his Olds for the Ford Fairlane currently shown in his avatar.

Paul

That is sad news.:(

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