th400 transmission modulator
March 20th, 2016, 05:35 PM
#1
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Location: Middlesex County, MA
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th400 transmission modulator
Hi, I was wondering if someone can tell me if this is correct or not. The other day I was replacing my TH400 transmission's modulator (1970 442) and the tranny fluid started flowing out - I was not expecting this, maybe a little fluid but not what appears to be a lot of fluid from the transmission (3 containers filled). I searched and found some articles that stated when they took it off there was only a small amount of fluid that came out. When I look in my service manual I only found how to install it and no mention of removing it. What could be wrong or is it normal for it to flow out like that?
March 20th, 2016, 06:51 PM
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Took another look at the service manual and I found the section on how to remove it but still no information whether the fluid should have been gushing out once I remove it.
March 21st, 2016, 09:00 PM
#5
CH3NO2 LEARN IT BURN IT
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Yep she'll spill out a bunch of fluid unless you do what Eric recommends. Did you replace it with a Standard Motor Products part number TM50? The TM50 is adjustable unlike the OEM. Just an FYI.
March 22nd, 2016, 07:53 AM
#6
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Hi, I was wondering if someone can tell me if this is correct or not. The other day I was replacing my TH400 transmission's modulator (1970 442) and the tranny fluid started flowing out - I was not expecting this, maybe a little fluid but not what appears to be a lot of fluid from the transmission (3 containers filled). I searched and found some articles that stated when they took it off there was only a small amount of fluid that came out. When I look in my service manual I only found how to install it and no mention of removing it. What could be wrong or is it normal for it to flow out like that?
Kidding aside, why were you replacing the modulator?
March 22nd, 2016, 08:02 AM
#7
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I'm replacing the transmission cooler lines along with the modulator vacuum line and my tranny was not shifting properly so I figured why not while I'm under there that I also replace the modulator as it looks to be the original.
March 22nd, 2016, 08:55 AM
#8
CH3NO2 LEARN IT BURN IT
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If your still having shifting troubles come back here and explain the conditions in which your experiencing said troubles, Ill try to help. Condition examples: Problem occurs Warm or Cold, at what speed etc...Try to get the line pressures read. Pressures are how you diagnose a trans problem. Whens the last time the filter and fluid was serviced? What did you find in the pan? How many miles are on it? Is it a TH350 or TH400?
March 22nd, 2016, 09:00 AM
#9
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Location: Middlesex County, MA
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If your still having shifting troubles come back here and explain the conditions in which your experiencing said troubles, Ill try to help. Condition examples: Problem occurs Warm or Cold, at what speed etc...Try to get the line pressures read. Pressures are how you diagnose a trans problem. Whens the last time the filter and fluid was serviced? What did you find in the pan? How many miles are on it? Is it a TH350 or TH400?
Thank you, I appreciate your help and everyone else's on here. Still buttoning things up and will report back later.
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