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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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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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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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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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