# th400

**URL:** https://forums.speedlife.net/t/th400/177717
**Category:** PittSpeed Automotive
**Created:** [October 17, 2005, 4:29pm UTC](https://forums.speedlife.net/t/th400/177717 "2005-10-17T16:29:55Z")
**Posts on this page:** 5
**Page:** 1

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### Author: ![Iceberg](https://avatars.discourse-cdn.com/v4/letter/i/e99b99/32.png) [@Iceberg](https://forums.speedlife.net/u/Iceberg)
#### Post date: [October 17, 2005, 4:29pm UTC](https://forums.speedlife.net/t/th400/177717/1 "2005-10-17T16:29:55Z")

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hey guys,

haven’t been on in awhile, trans am is running great but, i’m havin a tranny issue…

i’m hoping i don’t need a new tranny, but, who knows…

alright here’s what it does… in drive, speed increases, but wont shift outta 1st, and when it reaches ~45 mph (roughly 4700 rpm) it starts to slip…i’m not sure if that a fault in the tranny, or maybe an issue with the stall converter, or some vacuum piece on the tranny that regulates when the tranny shifts…

i was told by someone that there is a part on the tranny that runs off vacuum the helps/tells the tranny shift…if anyone knows the name of that part i’d be 20bucks away from fixing it, or i’d need to get a new tranny…either way, i’d like someone to point me in the right direction…

thanks for any kinda help i can get

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### Author: ![eurodad](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/eurodad/32/5988_2.png) [@eurodad](https://forums.speedlife.net/u/eurodad)
#### Post date: [October 17, 2005, 5:15pm UTC](https://forums.speedlife.net/t/th400/177717/2 "2005-10-17T17:15:40Z")

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modulator

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### Author: ![Quik](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/quik/32/5979_2.png) [@Quik](https://forums.speedlife.net/u/Quik)
#### Post date: [October 17, 2005, 6:08pm UTC](https://forums.speedlife.net/t/th400/177717/3 "2005-10-17T18:08:52Z")

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hey i got a tranny for you if you want it. its a 76 th400 with 50k on its yours if you haul it. it came from a 455 buick electra

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### Author: ![Iceberg](https://avatars.discourse-cdn.com/v4/letter/i/e99b99/32.png) [@Iceberg](https://forums.speedlife.net/u/Iceberg)
#### Post date: [October 20, 2005, 11:16am UTC](https://forums.speedlife.net/t/th400/177717/4 "2005-10-20T11:16:12Z")

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word quik,

give me after the weekend to figure out what it is, and i’ll get in touch with you about that,

can you vouch for the tranny? came outta a running car and everything? no problem at all?

Thanks

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### Author: ![Iceberg](https://avatars.discourse-cdn.com/v4/letter/i/e99b99/32.png) [@Iceberg](https://forums.speedlife.net/u/Iceberg)
#### Post date: [October 20, 2005, 10:11pm UTC](https://forums.speedlife.net/t/th400/177717/5 "2005-10-20T22:11:41Z")

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went out today and bought the modulator valve, and some motor mounts, aiming for saturday, maybe, if things go right…i’ll be behind the wheel of a real car again…