Too fast shift speeds

[Gordon340]

I would like to delay the normal upshift slightly. I have a 904 behind a 340 in my 67 Dart. I installed the Trans-go shift kit when I built the tranny. The shifts are good and firm under normal accelaration, but quick.

I have adjusted the throttle linkage till I have full linkage travel at full trottle. It downshifts good. I am thinking of putting a light spring in the govenor to delay the valve movement. Has anyone done this, and if so, what spring did you use?

Thanks.

Brian

 

[mr.318]

i would adjust throttlerod play with it till yo get it where you want you can get it to shift as late as you want start with having the throttlerod lever on the trans. in 3/4 of an inch before you even mash go the pedal go from there

 

[fishy68]

Brian if you have adjusted the throttle pressure linkage all the way you can replace the governor spring or weights but I believe they affect full throttle upshift rpm more than low speed shift rpm. If someone knows different please correct me. There is one thing I know you can do to raise your low speed upshift rpm without affecting your high speed upshift rpm and that's to adjust the throttle stop on the throttle pressure valve (kickdown valve) located on the side of the valve body. Of course this will require removing the pan but that's easier than changing governor weights and springs.

 

[Gordon340]

Thanks guys. Off comes the pan and I will put a little more preload on the t valve.

Brian

 

[krabysniper]

There is one thing I know you can do to raise your low speed upshift rpm without affecting your high speed upshift rpm and that's to adjust the throttle stop on the throttle pressure valve (kickdown valve) located on the side of the valve body.

Can you give us a more decriptive description of the adjustment of said valve please, keeping in mind that I want to do the reverse of what he is attempting to do. My upshifts are too delayed at part throttle driving but perfect or very close to perfect as far as W.O.T. Currently I can't get 2nd until the car is doing nearly 35 mph or so (still havnt ironed out the speedo pinion descrepancy) I am pretty sure my problem is the very adjustment is what you are talking about, but am uncertain which way to adjust it to get it fine tuned. I am most certainly not a transmission guru, but I do know my way around the 904, so a little guidence on the subject would be greatly apreciated.

 

[fishy68]

Can you give us a more decriptive description of the adjustment of said valve please, keeping in mind that I want to do the reverse of what he is attempting to do. My upshifts are too delayed at part throttle driving but perfect or very close to perfect as far as W.O.T. Currently I can't get 2nd until the car is doing nearly 35 mph or so (still havnt ironed out the speedo pinion descrepancy) I am pretty sure my problem is the very adjustment is what you are talking about, but am uncertain which way to adjust it to get it fine tuned. I am most certainly not a transmission guru, but I do know my way around the 904, so a little guidence on the subject would be greatly apreciated.

Sure. It's the valve that is opperated by the kickdown linkage. Where the linkage connects at the trans. it rotates a lever that goes inside the trans. and pushes on this valve which is located on the side of the valve body. This valve has a stop adjustment kinda like an idle adjustment on a carb. and it is nothing more than a long screw with a large diameter head and it has a locknut and it's screwed into the side of the valve body. Where this adjustment is set determines the low speed rpm shift. If you screw the adjustment in the low speed shift RPM will be raised. Adjust it out and the shift RPM will be lowered.

 

[crashcaptn]

I too have an issue with my 904. It shifts too quick. It just goes through the gears and drops me into the lowest very quickly. Should i be adjusting the same screw?

 

[fishy68]

I too have an issue with my 904. It shifts too quick. It just goes through the gears and drops me into the lowest very quickly. Should i be adjusting the same screw?

I hope I understand your question correctly because you say it goes through the gears and drops you in the "lowest gear" quickly. I think you mean "highest gear" but correct me if I'm wrong. That being the case. Is your throttle pressure (kickdown) linkage hooked up at the carb and properly adjusted? That's the first thing to check. Lengthening the linkage adjustment will raise your shift points. Try this first since it's the easy adjustment.

 

[crashcaptn]

thanks, i'll give that a shot first.. when the rain stops!

 

[krabysniper]

Sure. It's the valve that is opperated by the kickdown linkage. Where the linkage connects at the trans. it rotates a lever that goes inside the trans. and pushes on this valve which is located on the side of the valve body. This valve has a stop adjustment kinda like an idle adjustment on a carb. and it is nothing more than a long screw with a large diameter head and it has a locknut and it's screwed into the side of the valve body. Where this adjustment is set determines the low speed rpm shift. If you screw the adjustment in the low speed shift RPM will be raised. Adjust it out and the shift RPM will be lowered.

Thanks Fishy, I undestand exactly what you are refering to now. This is great info for fine tuning my trans, I just have to wait now for the weather to get nice enough for me to move the Dart over to the shop to get it on the hoist. Maybe I will be able to drive around the 25 mph streets in my neighborhood and not have it spinning up to 3 grand because it wont go to drive until 35 mph.

 

[fishy68]

Glad to help Kraby. Good luck with it.