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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: benracing123 on January 27, 2023, 11:14:51 AM

Title: Transmission shifting wrong after carb spacer install
Post by: benracing123 on January 27, 2023, 11:14:51 AM
I installed a 4 barrel carb spacer trying to boost my cfms a drop, however now my transmission shifts at 3k rpm under partial throttle, anyone have any idea h I could be


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Title: Re: Transmission shifting wrong after carb spacer install
Post by: zieg85 on January 27, 2023, 01:07:54 PM
I am going to assume you have a 700R4 transmission.  You changed the geometry of the TV Cable.  That needs re-adjusted.
Title: Re: Transmission shifting wrong after carb spacer install
Post by: benracing123 on January 27, 2023, 04:09:02 PM
Quote from: zieg85 on January 27, 2023, 01:07:54 PM
I am going to assume you have a 700R4 transmission.  You changed the geometry of the TV Cable.  That needs re-adjusted.
It is
I don’t exactly know what the tv cable is but I’ll find it


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Title: Re: Transmission shifting wrong after carb spacer install
Post by: benracing123 on January 27, 2023, 05:44:48 PM
Quote from: zieg85 on January 27, 2023, 01:07:54 PM
I am going to assume you have a 700R4 transmission.  You changed the geometry of the TV Cable.  That needs re-adjusted.
I only have 1 cable to my carb linkage and it’s my throttle


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Title: Re: Transmission shifting wrong after carb spacer install
Post by: benracing123 on January 27, 2023, 05:51:15 PM
(https://uploads.tapatalk-cdn.com/20230127/71df149025db49a0c2340a230cc37440.jpg)
Isn’t there supposed to be another cable next to the return springs?


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Title: Re: Transmission shifting wrong after carb spacer install
Post by: VileZambonie on January 27, 2023, 06:21:43 PM
Show us a picture of what transmission you have. If there's no cable it's a TH400
Title: Re: Transmission shifting wrong after carb spacer install
Post by: PapaDG on January 27, 2023, 07:04:30 PM
There should be a button to press behind the metal bracket on that black cable on top. You’ll have to test drive it once you adjust it and make adjustments as necessary so it doesn’t throw through all gears immediately.
Title: Re: Transmission shifting wrong after carb spacer install
Post by: bd on January 27, 2023, 07:22:40 PM
Quote from: VileZambonie on January 27, 2023, 06:21:43 PM
Show us a picture of what transmission you have. If there's no cable it's a TH400

This ^^^^.

Also, when you installed the spacer, did you unplug any vacuum lines and neglect to reconnect them?
Title: Re: Transmission shifting wrong after carb spacer install
Post by: JohnnyPopper on January 27, 2023, 07:30:26 PM
I'm more interested in the spacer  ;)

What's the theory?
Title: Re: Transmission shifting wrong after carb spacer install
Post by: VileZambonie on January 28, 2023, 08:02:02 AM
Quote from: JohnnyPopper on January 27, 2023, 07:30:26 PM
I'm more interested in the spacer  ;)

What's the theory?

50 horsepower man. Now put magnets on your fuel line for another 10-20 mpg!
Title: Re: Transmission shifting wrong after carb spacer install
Post by: Shifty on January 28, 2023, 09:01:36 AM
Quote from: VileZambonie on January 28, 2023, 08:02:02 AM
Quote from: JohnnyPopper on January 27, 2023, 07:30:26 PM
I'm more interested in the spacer  ;)

What's the theory?

50 horsepower man. Now put magnets on your fuel line for another 10-20 mpg!
And stickers....don't forget stickers....
Title: Re: Transmission shifting wrong after carb spacer install
Post by: JohnnyPopper on January 28, 2023, 04:50:34 PM
Hey Ben, I think we've been diss'd hard  :(