06-14-2021, 01:34 AM | #1 |
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Join Date: Oct 2016
Location: Austin, Texas
Posts: 306
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T400 help please
I have a 383 with a T400 transmission and BTE 310800 11” converter Stall Speed 2600-2800 rpm.
On my last drive the trans would not shift until it reached 4000rpm. What could be going wrong? What should I look for? Thank You |
06-14-2021, 06:08 AM | #2 |
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Join Date: Oct 2013
Location: Maine
Posts: 2,358
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Re: T400 help please
Check the vacuum line for full vacuum.
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06-14-2021, 11:25 AM | #3 |
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Join Date: Mar 2003
Location: Colfax-California
Posts: 8,570
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Re: T400 help please
Vacuum line most likely---OR the governor (under the 4 bolts on the side) has stripped a gear from the bushing walking in the case
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06-15-2021, 12:42 AM | #4 |
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Join Date: Oct 2016
Location: Austin, Texas
Posts: 306
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Re: T400 help please
Thanks guys, I know the vacuum line is hooked up but, what's the best way to test it?
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06-15-2021, 01:22 AM | #5 |
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Join Date: Mar 2003
Location: Colfax-California
Posts: 8,570
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Re: T400 help please
Hook a vacuum gauge to the line at the trans
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06-16-2021, 10:39 AM | #6 |
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Join Date: Dec 2011
Location: Yuma Arizona
Posts: 1,526
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Re: T400 help please
I had same issue bit I had my vacuum advance cannister off the HEI T-d into it. The diaphragm in the cannister went bad and raised my shift points like you.
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06-16-2021, 11:25 AM | #7 | |
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Join Date: Oct 2016
Location: Austin, Texas
Posts: 306
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Re: T400 help please
Quote:
I'll get a chance to look at it this weekend. Hopefully its just a line that came unattached. |
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06-20-2021, 08:51 PM | #8 |
Registered User
Join Date: Oct 2016
Location: Austin, Texas
Posts: 306
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Re: T400 help please
Well, I tested vacuum at the transmission it was 20-22 at 3000rpm. Does that sound about right?
Then I checked the kick down switch and it was stuck on. I took the Lokar switch apart and sprayed it with silicone lube. That seems to have done the trick. All is well now, thanks for the help. |
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