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Old 05-01-2005, 08:52 AM
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400 tranny slipping

While I was driving my 49 pickup the turbo 400 transmission started to slip
It got so bad I pulled over. I put it in reverse then back in drive and it work
okay. It did the same thing about 30 mi later when I started to take off.
I had the tranny pulled this winter when I put a new SBC in. I change
all the fluid. and filters in the tranny. I check the fluid and it was down about 1/2 quart. Not knowing a thing about the tranny can anyone tell me the possiblities that might cause the slipping.

Thank you

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Old 05-01-2005, 11:26 AM
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56 year old clutches

Your clutch packs are probably really worn since you didn't mention if these were replaced. Especially on a 56 year old truck. There is a pack of metal and fiber plates that make up each pack for each gear. Have these replaced, or invest in a new trans. Hope this helps.
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Old 05-01-2005, 02:27 PM
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since the t-400 was introduced in 1964 model year, the tranny is not 56 yrs old.

49dream;

There are many possible problems with the t-400 since you do not know the history of the tranny. If it is slipping , it will not last long. The friction material is thin and wears fast when slipping



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Originally Posted by broncoII88
Your clutch packs are probably really worn since you didn't mention if these were replaced. Especially on a 56 year old truck. There is a pack of metal and fiber plates that make up each pack for each gear. Have these replaced, or invest in a new trans. Hope this helps.
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Old 05-01-2005, 06:01 PM
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Thanks for the info sounds like I need to shell out some money.
I will probably go with a 700r At least this will have a overdrive and
help the gas mileage. What does the torque converter do. Will that cause
it to slip.
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Old 05-02-2005, 06:28 PM
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The torque converter is like the clutch on a manual. Except instead of a flywheel, there is a flexplate. They are very similar so don't worry about it. There is a post about flywheels and flexplates in this forum somewhere if you have questions. Anyway, the torque converter allows for the quick power disruption to shift gears. After a certain rpm is reached, the fluid actuated clutch pack starts to engage the gear while the torque converter allows for the correct amount of torque to be applied. However if the torque converter is slipping, it may be hard to tell because of the likelyness of the clutch packs. I really don't like autos because the converter slams the car into gear instead of the driver controlling the clutch. Just my preference.
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Old 05-02-2005, 06:58 PM
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Bronco
So are you saying it could be the torque converter making the tranny slip.
When I pull the dip stick it does not smell like anything is burning and when I pulled the pan this winter it was nice a clean with no signs of any metal.
Is there any test that one can perform to see if it's the converter.
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