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Discussion Starter · #1 ·
Well is there way to get it to shift more firmly. I come from old GM Hydromatic and torque flights were all you had to do was swamped fluids or throw in some tricks shift or put a heavier weight on the governor and bam you got firmer faster shifts. Is there any cheap and easy ways to do the same principle here. Or has anybody found a hack or something along the lines to do that.


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Spoolin shift kit consisting of aluminum accumulator pistons, accumulator springs and piston travel limiting rods can be had for around $300.
Or, IPT can rework your valve body for around $650.
 
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Discussion Starter · #3 ·
Spoolin shift kit consisting of aluminum accumulator pistons, accumulator springs and piston travel limiting rods can be had for around $300.

Or, IPT can rework your valve body for around $650.


That's a tad more invasive and costly then I was looking for but I figured it would be something along those lines. Stuff ain't simple like it use to be. Do you have experience with the kit? DIY?


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Do you have experience with the kit?
I have the IPT valve body in one of my Tundras. I am happy with it. Took about 3 hours to install.

That's a tad more invasive and costly then I was looking for but I figured it would be something along those lines. DIY?
If you are looking for a less invasive cheaper option, I guess you could buy a used Bully Dog for 200 bucks and set the transmission shift to performance mode.
It will not give you the same effect as a shift kit of VB mod though.

As far as DIY, if you are handy and have access to a lathe, you could build your own Spoolin type shift kit for a fraction of the cost.
Much more time consuming though and more chance to get something wrong.
 

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Well is there way to get it to shift more firmly. I come from old GM Hydromatic and torque flights were all you had to do was swamped fluids or throw in some tricks shift or put a heavier weight on the governor and bam you got firmer faster shifts. Is there any cheap and easy ways to do the same principle here. Or has anybody found a hack or something along the lines to do that.


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Yea no I'd rather buy it and install it then make it. But like the old th350s you but the VB spacer and throw in some trick shift or typeF and for like 150 and an hour your chirping gears


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The type of transmissions that accept those mods have been gone for 20+ years... What's the last truck you drove? lol. Don't get me wrong, I'm a big fan of how easy it is to work on older vehicles, its just that everything's been electronically controlled since the early 90's, including GM vehicles.
 

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Discussion Starter · #7 ·
Correct and my older gm has a electronic lock up converter but even into the electronic ones small stuff still worked didn't know how advanced ours were. I know it's nothing like the dodge 10spds that are electronically shifted and stuff so I was hoping for a cheap fix to lackluster sponge shifts


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didn't know how advanced ours were. I know it's nothing like the dodge 10spds that are electronically shifted and stuff
The Tundra transmission is electronically shifted and the line pressure is electronically controlled too.
 

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Your tundra came with a shift kit built in - just push the Tow/Haul button or put it in Sport Mode ('S' on the trans selector). There are effectively two different valves/fluid paths for each shift in the tundra transmission: an easy-goes-it valve and a shift-right-now valve. 'D' tells the trans to use the easy-goes-it route while Tow/Haul and 'S' select the latter. Tow/Haul also adjust throttle sensitivity and raises shift points while 'S' is closer to stock throttle without delayed shifts, but, IIRC, bypasses any learned programming that the transmission acquires from driver input over a period of time.
 
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I come from old GM Hydromatic and torque flights were all you had to do was swamped fluids or throw in some tricks shift or put a heavier weight on the governor and bam you got firmer faster shifts.
The TH400 became 4L80E around 1991. I had an acquaintance who had access to the Delco source code and was able to alter shift speed and line pressure in the original GM controller. Alter the address maps, burn an EPROM, plug in and chirp the tires. No dirty hands at all. :D
 

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Discussion Starter · #12 ·
Your tundra came with a shift kit built in - just push the Tow/Haul button or put it in Sport Mode ('S' on the trans selector). There are effectively two different valves/fluid paths for each shift in the tundra transmission: an easy-goes-it valve and a shift-right-now valve. 'D' tells the trans to use the easy-goes-it route while Tow/Haul and 'S' select the latter. Tow/Haul also adjust throttle sensitivity and raises shift points while 'S' is closer to stock throttle without delayed shifts, but, IIRC, bypasses any learned programming that the transmission acquires from driver input over a period of time.


Not like that though cause tow haul shifts the same just holds gears longer it's not any quicker or snappier in terms of actually shift time and firmness and when I put shifter in S it's completely still commanded by the pedal if I have even a hair too much throttle it won't shift when I tell it to what do ever about the only time S does anything it's told is when I'm downshifting to slow down that's it.


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Discussion Starter · #13 ·
The TH400 became 4L80E around 1991. I had an acquaintance who had access to the Delco source code and was able to alter shift speed and line pressure in the original GM controller. Alter the address maps, burn an EPROM, plug in and chirp the tires. No dirty hands at all. :D


Like that! That's what I want for this lol I did same with th350/4l60e or at least some firmer fluid was still leaps better then stock. Now we have too much technology controller our crap. Sky net is coming.


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