Transmission modifications?

Ratios can also be adjusted but this is a major gearbox strip down and rebuild. For tuned engines most go with a different final drive ratio to put the power band where it's wanted. As has been said, we need a few more details about your aims and why you want to do this and hopefully we can point you in the right direction.
 
Sure there are:

  • Transmission Coolers
    • Transmission coolers allow for lower temps, and longevity. Keeping the temps low are what allow a transmission to last longer. If you tow, use your car for taxi/delivery purposes (doordash and uber drivers, that's you) do mountain driving (think Colorado or Pennsylvania) or do tons of stop and go traffic (that unlocked torque converter spins and spins generating heat) you probably want to consider a transmission cooler! If installed properly, they can more than double the life of your transmission. Mishimoto and Derale are some examples of companies who make them.
    • b-m-trans-cooler-temp-chart-jpg.99073
  • Shift Kits
    • Shift kits can allow for more firm shifting. Some people describe this as a "harder shift". But wait, aren't hard shifts bad? Yes, if we are talking about hard shifts due to transmission failure. BUT there is another kind of hard shift. Usually, automatic transmissions are designed for passenger comfort, and when shifts occur, a little bit of overlap, slippage occurs in between clutch pack engagement between gears (say, gear 1 and gear 2, or gear 2 and gear 3), allowing for a very "smooth" feeling shift. But that small amount of slippage (that is designed from factory) contributes to wear on clutch packs/friction discs. Over time, friction discs eventually fail. In addition, while small, these minuscule fractions of a second wasted on allowing the shift to mildly slip for comfort purposes is time that could be spent putting torque through the tires to the ground. Shift kits allow for a firmer shift, the solenoids are modified to shift quicker, firmer, and engage clutch packs immediately with no slippage or less slippage than stock. This allows for a quicker, firmer shift, little to no slippage or less slippage which means less friction disc on friction disc wear, and also, more of a "jolt", if you will, when the car shifts. Many drivers just trying to get to work might consider a shift kit's feel as "uncomfortable", but it definitely is preferred for top performance and can actually extend a transmission's life. Here is an example of different shift kit results and the "firmness", quickness, and "harder" shifts you will experience when installed:
      TransGo is one of the largest maker of shift kits and usually sells a lot of them for guys with pickups, they tend to be popular for that market.
  • Inline transmission filters
    • A lot of transmissions these days (2015+) do not have a changeable filter or even a removable pan anymore. But like any fluid, at high mileage, transmission fluid can get dirty. Some people decide to install an inline filter that is serviceable, say, every 25,000 miles. The nice thing about these filters is they now include a bypass valve in the event that they get clogged (which could, of course, cause catastrophic failure of a transmission) and also include a bigger magnet to catch ferrous materials (fine metallic particles). Installing a secondary filter like this can allow for the internal filter to stay clean indefinitely, if the inline filter is installed correctly, usually after the cooler, on the return line, before fluid returns back into the transmission, back to the pan. It acts as a sort of "pre-filter" before going to the main filter. This is great in many cases for longevity, because those internal filters involve pulling the transmission and opening the case to change. The inline filters, on the other hand, can be changed just by popping the hood and undoing hose clamps, as part of a transmission fluid change. You can even install them on modern cars (I have one on my 2018 sedan).
    • 81Zcs4H1bpL._AC_SL1500_.jpg

Keep in mind, transmission modification is not to be taken lightly. The modern automatic transmission is an especially sensitive machine in this day and age. Even slight modifications can result in catastrophic failure. If you are not comfortable or don't feel you have the expertise to modify an aspect of your automatic transmission, have a qualified professional do the work for you, or avoid it altogether.

Transmission replacement is no fun. I would know!

But yes, modifications exist.
 
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