Improving Transmission Shifting

[82much]

Gas mileage improved?

 

[inkpot]

Oh, much improved! Like 0.00001 mpg!

 

[NLXTACY]

Oh, much improved! Like 0.00001 mpg!

At least! and that's city!

 

[retrofive]

You're all going to overheat and blow your transmissions.

-mr ditz

 

[inkpot]

OMG!! We're all gunna die!

 

[zooman61]

Did this mod over the weekend. The more I drive the more I like. Its not something I would go out of my way to do its more of a while your their kinda thing. other then leds this is the best cheap mod ive done

 

[kdxman]

Also did this mod over the weekend with the washer shifting has greatly improved. Should have done this this sooner.

 

[DARKNESS]

So, why does the transmission have this line pressure adjustment? Is it set differently in different markets? Or is this transmission set up differently in other vehicles?

 

[JCruse]

I was wondering the same thing. Perhaps this pressure adjustment is there to tune up an old worn out tranny that's about ready for a rebuild. To buy some more time..?

I'd like to hear how everyone who did this mod is making out these days before I go and do it myself.




.

 

[murf]

Still one of the better mods I've done

 

[scottryana]

Yep my guess would be that is there to be adjusted as the clutches wear. If your doing this you might as well get the transgo shift kit.

I was wondering the same thing. Perhaps this pressure adjustment is there to tune up an old worn out tranny that's about ready for a rebuild. To buy some more time..?

I'd like to hear how everyone who did this mod is making out these days before I go and do it myself.




.

 

[1973Guppie]

Yep my guess would be that is there to be adjusted as the clutches wear. If your doing this you might as well get the transgo shift kit.

exactly, the transgo shift kit really brings the tranny back to life. I did notice however though that the tranny does shift a bit different / harder until it is warmed up. Once warmed up it shifts very nicely. Not a big deal but something to mention to others if they do this conversion.

 

[Bella1992]

All I do is hit the power button.

 

[toyteg08]

The "dial thingy" is called the sleeve in this diagram. If pushed in far enough the retainer falls out, then the sleeve and plunger will come out. Find a washer(s) the thickness that you desire, that will fit over the plunder snout and install it to additionally preload the spring.

Forgive me if this is a stupid question, and I'll admit that I haven't dropped my tranny pan to mess with this yet, but wouldn't there be FOUR adjustment settings on the sleeve? In the picture, it looks like you would be able to rotate it to the most raised portion of the sleeve - the plateau with the "A" stamped on it. No?

 

[Tools R Us]

Forgive me if this is a stupid question, and I'll admit that I haven't dropped my tranny pan to mess with this yet, but wouldn't there be FOUR adjustment settings on the sleeve? In the picture, it looks like you would be able to rotate it to the most raised portion of the sleeve - the plateau with the "A" stamped on it. No?

Likely could, but, IIRC, it doesn't have ribs to hold the adjustment in place? So, not intended as an adjustment point, could vibrate/move randomly to one of the other adjustment points. For larger adjustments, I'm more comfortable with spacer washers under the plug.

 

[toyteg08]

Yeah, good point. Maybe the internal pressure of the spring isn't enough to hold it in place after thousands of miles of driving. Ugh, makes me so nervous to think of messing with anything around the valvebody!

 

[cjmoon]

the Transgo kit has a firmer spring to go behind the adjustment to really improve rail pressure as well as move move more fluid for faster quicker shifts as mentioned before

 

[Jibreezy82]

The system line pressure is set by the primary regulator valve, this is the overall pressure setting. The throttle regulator is progressive, reduces pressure at low throttle operation to make shifts smoother in lower throttle operation. At some point (2/3-3/4 throttle depending on adjustment, etc), the throttle regulator is maxed, so is using full system pressure.

Just adjusting the cable will work for some uses. What happens; as it tightened, there is less pressure reduction at lower throttle settings, so firmer shifts. But it reaches system pressure sooner and there is no benefit at full or close to it throttle operation.

By setting the system pressure higher it moves all of the pressures higher. This gives greater range to the throttle adjustment, if anything, may need to back off the cable to to get it where you want, especially for smooth low range operation. It makes a significant difference in most or full throttle operation, like when pulling up a big ledge on the trail, significantly less slip, better compression braking when playing in the rocks, etc.

The other benefit is the way that the cooler works, it's bypass system, it has to be, system pressure is too high (~150-200psi ish) for the lines, cooler, etc. So, the fluid runs all of the things, clutches, bands, torque converter, etc, when it reaches the end, any excess is reduced in pressure and sent to the cooler. When fluid flushing at the cooler, our observation is that the rigs with this mod pump out the fluid quicker than stock rigs, so have higher cooler flow.

I know this is too late to comment on but cant help but admire the post. I called Rodney from wholesale transmissions couple of months ago before reading this thread, I was looking into buying his Extreme valve body, and one thing he confirmed that the harder the shift the better/cooler for the trans because of of less slip.

 

[Tools R Us]

I know this is too late to comment on but cant help but admire the post. I called Rodney from wholesale transmissions couple of months ago before reading this thread, I was looking into buying his Extreme valve body, and one thing he confirmed that the harder the shift the better/cooler for the trans because of of less slip.

Agree, also, with more system pressure, more fluid is sent through the coolers, so runs cooler when stressed.

 

[Jibreezy82]

Agree, also, with more system pressure, more fluid is sent through the coolers, so runs cooler when stressed.

Im doing the same to my A442F next week. I'll have a look at the valve body, If it follows the same steps as post #1 then I'm doing it.