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There are other ways of doing it, but all it will do is up your line pressure at a lower percentage throttle opening. More wear and tear on the pump and the exact same max line pressure. Just gives you higher pressure at a lower point. I did a variation on this when I began to lose my 3-4 clutches again. Helped for long enough to keep it together so could get my 4l80e in and running. Sort of like some of the full manual kits that give you max line pressure at all points of the throttle. May give you some longer clutch life at the cost of pump life, heat and fuel economy.
 

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I have a different take on this. The length to the trans ball stud on the Holley and Edlebrock carbs are closer to the throttle blade centerline than the original GM geometry. So swing arc of the TV cable travel is shorter in overall length than originally intended.

The spring in this set up compress for the WOT setting and all is fine. But at closed throttle settings, it effectively "adds length" to the cable travel distance.
 

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Do you have a problem with the way yours is working now?
 

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Not personally, I was just searching for 200-4R parts, and happened to stumble across it. Was curious as to why it would even be sold, considering how critical the TV cable adjustments are.
They sell it because people will buy it and they don't care what it will do to your transmission.
Why do people buy the "tornado"? Or oil additives that claim they will refresh your 150k mile engine? Or cigarettes? Or any other stupid thing or snake oil? Because they're gullible and want to believe everything they read if it's an easy and cheap solution.
 

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Yes, people will buy just about anything. At least this one could do something useful, but it would be much better to just space out the Throttle valve properly in the first case. Could be worse, at least it doesn't work in reverse and soften the shift, burning the clutches out in short order. Not that frying the pump is such a great result...
 

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I have crimped split shot onto the cable in the same place as this spring goes, and have run over 10k miles on a trans like this without issue. It makes it easy to fine tune it.
 
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