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Old 08-29-2003, 04:10 AM
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Why isnt it shifting right?

My nova has a TH350 that was rebuilt in 90 and has about 30000 miles on it. I recently noticed it started to take linger on go into ger and holds on to gear longer that usual.I'll be cruising about thirty and it wants to stay in second when it used to shift to third. I checked and the fluid was quite burned so i swapped fluid and filter, cleaned out pan, etc. It shifts into gear better and shifts firmer bit still holds on to gears to long. Any help is greatly appreciated. Im a 17 year old kid trying to learn.

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Old 08-29-2003, 06:04 AM
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I am not quite an expert on transmissions,but it may be possible that your problems are caused by a bad vacuum modulator.Check the lines to it to make sure there are no leaks.Modulators are cheap and a cinch to replace.
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Old 08-29-2003, 08:40 AM
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as mentioned check the vacuum modulator, the hoses to it (top & bottom). Pull the hose off the mod aat the tranny, if oil comes out....it is bad!

check for other vacuum leaks if these hoses are good.

Most often if a good functioning T-350 or 400 tranny suddenly does not want to shift to 3rd, check for vacuum troubles, or poor engine performance.


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Old 08-29-2003, 11:49 AM
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Re: Why isnt it shifting right?

Quote:
Originally posted by 1973ChevroletNova
My nova has a TH350 that was rebuilt in 90 and has about 30000 miles on it. I recently noticed it started to take linger on go into ger and holds on to gear longer that usual.I'll be cruising about thirty and it wants to stay in second when it used to shift to third. I checked and the fluid was quite burned so i swapped fluid and filter, cleaned out pan, etc. It shifts into gear better and shifts firmer bit still holds on to gears to long. Any help is greatly appreciated. Im a 17 year old kid trying to learn.
You said that "the fluid was quite burned". If that was the case, it most likely has a problem that a new modulator or vacuum will not correct. Changing the fluid when it is burned and the trans is not working properly, only makes you feel better. It actually does not correct a problem. It can however halp mask a problem and cause more damage by allowing you to continue to drive the vehicle as things wear out beyond repair.
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Old 08-29-2003, 05:26 PM
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I just got a B&M TransPak for my TH350 and I'll tell ya what the troubleshooting said for problems like those.

It says for overheating/burning fluid, it could be a high fluid level, a plugged transmission cooler, or an insufficient cooler.

For not shifting/no third, it says the valve body bolts could be loose or the detent cable could be misadjusted.

But still, like adtkart said, there could be something drastically wrong and continuing to drive it could make things worse. I think the best thing to do would be to take it to a shop.
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Old 08-29-2003, 07:08 PM
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the original post does not mention trouble with other gears.

If 3rd is a problem with holding power, then usually reverse will have some problems too.

The detent cable (if hooked up) could have slipped it's adjustment. It would be pulling more than previously to delay the shift to 3rd.



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Old 08-30-2003, 08:28 AM
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Like previously stated could be a problem with the modulator. It can also be a vacuum problem. On older cars the hoses get hard and brittle. They are known to cause vacuum leaks, and usually will cause problems with shifting. Also as Crosley stated the kick-down cable could have slipped at the top where the adjustment is. They don't really lock tight enough sometimes, and someone could easilly bump them and cause them to slip. Released, it will be as tight as it can be.
Good Luck
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