Slant Six Forum :: 904 Throttle Pressure Adjustment

Bucket, look for the thread a couple down from this on... asking about a shift kit....

Try an allen wrench

Richard

Thanks fellas.
Looks like it will be pretty hard to do with the valve body still in the box,with the box still in the car.
I've just noticed the manual says to do it with the valve body out of the box,which is something i didn't want to take out.

Quote:

Thats what the mod to the allen wrench was for, so you didnt have to drop the VB... its a tight fit for sure but it can be done...

Quote:

Bucket, look for the thread a couple down from this on... asking about a shift kit....

That seems to be about line pressure adjustment

Installing a shift kit is like putting a cam in an engine,it just depends how hot you want it to be.The Trans-go "no-yo-yo" would be my first choice,with the TF-1 being the absolute hottest for a stock converter. Here, I got a zero buck trans secret for you. Most '70-up non-HP car trans don't even have the line pressure adjusted to "service manual" specs.You
need to drop the pan,and make the following tools;

The first pic shows an 3/16" allen wrench shortened to adjust the line pressure w/o removing valve body,it's a tight squeeze to clear the inner case,so keep grinding it down a little bit and checking. The "T" shaped tool is a gauge to check line pressure adjustment of 1 5/16"

Using the tool,adjust spring retainer,rotating allen screw counter-clockwise,draws retainer toward valve body,increasing line pressure.

If you'r NOT a tool junkie,who likes making the "perfect tool for every purpose" ,you can just use a 1/4" rod or drill bit as shown.An increase in line pressure causes the trans to shift firmer,and slightly increases shift points too.Are you feeling froggy?-then adjust inward another full turn or two,but check that you don't run out of adjuster threads. Some trans shops adjust them in futher than this but I don't recomend this w/o professional valve body mods,So if you find one like that,leave it alone.

Author:	BUCKET 636 [ Mon Jun 25, 2012 3:08 pm ]
Post subject:	904 Throttle Pressure Adjustment
While i am waiting for my gasket for my deep pan filter extension from Pat Blais,i have been studying up on things i can adjust while i have my pan off. While i am doing my band and line pressure adjustments i thought i may as well do the throttle pressure adjustment. As i don't have the special tool,does anyone know what the measurement is on special tool C-3763 (as in photograph) ,i can probably make up something to suit. May i add that Pat Blais has been great with his info and very quick in his responses,A+ Cheers, Greg

Author:	Mroldfart2u [ Mon Jun 25, 2012 3:13 pm ]
Post subject:
Bucket, look for the thread a couple down from this on... asking about a shift kit....

Author:	BUCKET 636 [ Mon Jun 25, 2012 3:57 pm ]
Post subject:
Quote: Bucket, look for the thread a couple down from this on... asking about a shift kit.... That seems to be about line pressure adjustment

Author:	Fopar [ Mon Jun 25, 2012 5:21 pm ]
Post subject:
Try an allen wrench Richard

Author:	BUCKET 636 [ Mon Jun 25, 2012 6:18 pm ]
Post subject:
Quote: Try an allen wrench Richard Yes,to adjust the screw. What about pushing in the throttle valve ?

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904 Throttle Pressure Adjustment https://slantsix.org/forum/viewtopic.php?t=49132	Page 1 of 2

Author:	bigslant6fan [ Mon Jun 25, 2012 6:34 pm ]
Post subject:	.
I believe it's 5/16 inch,but Ill have to check. Adjustment isn't likely to be needed.

Author:	Fopar [ Mon Jun 25, 2012 8:27 pm ]
Post subject:
Yes close to 1/8" Richard

Author:	Al T [ Tue Jun 26, 2012 8:46 am ]
Post subject:	Throttle Pressure Adjustment Distance
Greg, my FSM only shows tool/gage C-3763 as well but does not specify the dimension for those of us who do not have the tool. Using a vernier caliper, I just measured the distance on a spare valve body I've got lying around (pushed in the kickdown valve with a screw driver) and it came out to 0.665". Not sure if that's the right dimension/setting. I too would like to hear what this was originally specified to be. Looks to me that the smaller this distance, the sooner the buildup of throttle pressure and the sooner the kickdown will occur when depressing the accelerator pedal.

Author:	bwhitejr [ Tue Jun 26, 2012 1:51 pm ]
Post subject:	Throttle Pressure Adjustment
I don't remember where I saw it, but the measuremnet I saw said 5/8". bwhitejr

Author:	BUCKET 636 [ Tue Jun 26, 2012 5:17 pm ]
Post subject:
Thanks fellas. Looks like it will be pretty hard to do with the valve body still in the box,with the box still in the car. I've just noticed the manual says to do it with the valve body out of the box,which is something i didn't want to take out. I can only jack my car up a certain distance to get my stands underneath with the trolley jack i have at home,so i don't have much room to work underneath the old girl.

Author:	Mroldfart2u [ Tue Jun 26, 2012 5:29 pm ]
Post subject:
Quote: Thanks fellas. Looks like it will be pretty hard to do with the valve body still in the box,with the box still in the car. I've just noticed the manual says to do it with the valve body out of the box,which is something i didn't want to take out. Thats what the mod to the allen wrench was for, so you didnt have to drop the VB... its a tight fit for sure but it can be done...

Author:	BUCKET 636 [ Tue Jun 26, 2012 7:32 pm ]
Post subject:
Quote: Quote: Thanks fellas. Looks like it will be pretty hard to do with the valve body still in the box,with the box still in the car. I've just noticed the manual says to do it with the valve body out of the box,which is something i didn't want to take out. Thats what the mod to the allen wrench was for, so you didnt have to drop the VB... its a tight fit for sure but it can be done... The throttle pressure adjusting screw has a lock nut on it,which is tucked in underneath the valve and lever.Which i'm sure would be fairly hard to get at when you are trying to press in on the valve to get your measurement. It also has a screw head instead of a allen head,which although in the photograph looks like there is room to get at it,there is less room than getting to the line pressure adjustment. Before you all go ,this isn't the box in my wagon,it's a spare in the shed.

Author:	BUCKET 636 [ Wed Aug 22, 2012 2:59 pm ]
Post subject:
Anyone have a heads up on this measurement? I will have the valve body out of the box soon and as there are 3 different measurements above it's a bit confusing.

Author:	Mroldfart2u [ Wed Aug 22, 2012 3:30 pm ]
Post subject:
Quote: Quote: Bucket, look for the thread a couple down from this on... asking about a shift kit.... That seems to be about line pressure adjustment Yes it is and it has a description of the tools/measurments you had asked.... Quote: Installing a shift kit is like putting a cam in an engine,it just depends how hot you want it to be.The Trans-go "no-yo-yo" would be my first choice,with the TF-1 being the absolute hottest for a stock converter. Here, I got a zero buck trans secret for you. Most '70-up non-HP car trans don't even have the line pressure adjusted to "service manual" specs.You need to drop the pan,and make the following tools; The first pic shows an 3/16" allen wrench shortened to adjust the line pressure w/o removing valve body,it's a tight squeeze to clear the inner case,so keep grinding it down a little bit and checking. The "T" shaped tool is a gauge to check line pressure adjustment of 1 5/16" Using the tool,adjust spring retainer,rotating allen screw counter-clockwise,draws retainer toward valve body,increasing line pressure. If you'r NOT a tool junkie,who likes making the "perfect tool for every purpose" ,you can just use a 1/4" rod or drill bit as shown.An increase in line pressure causes the trans to shift firmer,and slightly increases shift points too.Are you feeling froggy?-then adjust inward another full turn or two,but check that you don't run out of adjuster threads. Some trans shops adjust them in futher than this but I don't recomend this w/o professional valve body mods,So if you find one like that,leave it alone.

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Author:	BUCKET 636 [ Wed Aug 22, 2012 5:49 pm ]
Post subject:
^ I appreciate your help Mroldfart,but what you have posted is still about line pressure adjustment. I am talking about the measurement for the throttle pressure adjustment which is next to the line pressure adjustment.