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Old 03-28-2010, 07:18 AM
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Transmission problems?

I have a th400 and starting from the beginning... Purchased from TCI about 5 yrs. ago. put a summit TC in it .. a cheap one. I think it was advertised as 1200 stall speed. Ran it for about 3yrs.w/ a mild 350ci. as time went on, it seemed to loose pressure when the car sat for a few days. I would start her up, and it would not grab a gear F or R for a few minutes. once it was warmed up, it was fine. The Tranny guy here told me to start with a check valve. I let it go for about 3 months because I was planning to change motors.. do it all at once. NOW, the new motor is in in and the problem has changed. No pressure loss when the car sits, but now it falls out of gear when coasting around 1500 rpm. then when I get back on it, it feels like it grabs 2nd. then immediately jams into 3rd.

The tranny guy wants me to undo the TC bolts, and see if the TC spins freely. I Spent some time cleaning the back of the block and the TC before the install and it seemed( from what I remember) that it went together smoothly and it spun freely. I plan on double checking but I would like to gather some more info before doing anything.

I really don't know much about transmissions. So please be gentle.
Thanks in advance

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Old 03-28-2010, 07:44 AM
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Could be the front accumulator piston has failed (some were plastic, and the center breaks out of them) or the accumulator seal.

This will cause no engine braking because the band cannot apply.

The VB has to be pulled to fix this.
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Old 03-28-2010, 08:05 AM
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Quote:
Originally Posted by cobalt327
Could be the front accumulator piston has failed (some were plastic, and the center breaks out of them) or the accumulator seal.

This will cause no engine braking because the band cannot apply.

The VB has to be pulled to fix this.
Please excuse my ignorance. VB ? I am pretty good with engines an consider myself adequately mechanically inclined, but dumb as a stump when it comes to trans. Should the trans. shop do this or it it fairly simple? I have only SEEN the inside of a Trans. a few times. ..and not to work on them. Is this expensive?
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Old 03-28-2010, 08:16 AM
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Quote:
Originally Posted by Fast 4 Door
Please excuse my ignorance. VB ? I am pretty good with engines an consider myself adequately mechanically inclined, but dumb as a stump when it comes to trans. Should the trans. shop do this or it it fairly simple? I have only SEEN the inside of a Trans. a few times. ..and not to work on them. Is this expensive?
Sorry, VB = "valve body".

The damage would look like:


If you attempt the removal of the "C"-clip, be aware that there's a heavy spring under the clip that has to be compresses before the clip is removed.
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Old 03-28-2010, 12:19 PM
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Could be a worn Governor too.
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