904 decel no load downshift?

[Scott Warner]

Got about 75 miles on my home brew 904. Recently started a no load (no throttle ....as in coming to a red light) downshift 3-2. Its not harsh...but feels like I dropped it into 2 at exactly 30 mph.
Normal?
I was thinking I may have the D/S cable (yes its converted) a little tight?

Thoughts?

Thanks Y'all.

 

[AJ/FormS]

What you have is a mismatch in the pressures.
With a closed throttle, and the KD mechanical linkage properly adjusted, the TV pressure is at a minimum.
Therefore, it has to be that the governor pressure is too high for the line-pressure; (or the other way around; that the line pressure is too low). My guess is that since it was fine at one time, the governor is just stuck. This is a hard sell for me, cuz Mopar governors just never stick, therefore;
I would revisit the KD adjustment first. followed by the line-pressure

If you have a lot of trouble with this;
What I did was drill and tap a hole, in the case, in line with the Line pressure adjuster, then installed a pipe-plug. To adjust the line pressure now, I just drive the car up on a curb, which tips the oil over to the passenger side and have at it. It only takes minutes now.

You can install a pressure gauge in the governor circuit, and diagnose with that.

 

[RustyRatRod]

I agree with AJ. The simplest thing is to make sure the kickdown cable or linkage is adjusted correctly. Also, it needs a return spring on the kickdown separate of the throttle return spring. If not, then it can cause what you're experiencing by not allowing the kickdown to fully release on decel.

 

[AJ/FormS]

This kindof thing can easily happen if the throttle-cable bracket sits too low, as happens when you try to use a 2bbl bracket on a high-rise intake; the geometry can get a little messed up.

 

[Scott Warner]

Ill give it a look..and for the record I am using the Lokar cable bracket.
Ad for picture reference

LOKAR Edelbrock Carb Bracket and Springs TCB-40DQ 847087003346 | eBay