2/12/2024 0 Comments Transbrake th350![]() Anyway there are companies that make ultra light-weight parts out of expensive aerospace materials like titanium that can reduce the rotating weight by up to thirty pounds and are stronger by far than the stock parts. I'm surprised no one caught my typo the TH400 properly preped can handle nearly 2,000 hp not the 1,000 as I said (I was thinking of the 4L80E which can only handle about 1,200 horse when built to the max). ![]() Luckily just like Camaros there are more people than GM making parts for the tranny. ![]() Additionally, there is an equal amount of force generated when shifting in and out of all three gears. All of this happens in the short time it takes to shift gears (less than a second if using a shift kit). Keep in mind, when General Motors designed the TH400, it was for an entirely different purpose than racing.įor example, shifting from first gear to second gear, will mean instantly stopping the 14-pound direct drum, which is turning at 84 percent of engine speed, while the 8-pound front reaction carrier starts turning at 50 percent engine speed. This is the reasoning behind having heavy internal parts. The Turbo 400 had to handle the torque of a big-block powerhouse as well as deliver a comfortable and reliable drive. To begin with, there is an incredible amount of inertia produced inside an automatic transmission. Gear vendors states that they have measured parasitic drag before and after on a Spintron and their overdrive units contribute only one additional horse power (way better than the 4L80E numbers). The parasitic drag is predominately centered in the torque converter (the factory changed the angle of the blades compared to the TH350 anticipating more torque input) so which converter you choose will have a big effect upon parasitic drag. Parasitic drag has been estimated at 20 to 40 horse power more than the TH350 (most state at least 20 average appears to be 24hp) dependant upon how much torque is input into the system. As soon as we get into a "irresistible force being applied to an immovable object" then you are going to have more breakage problems with a TH350 than you will with a comparably built TH400. That consumes power for this reason the TH400 has more parasitic drag than the TH350.Ĭan a TH350 live behind a 383? Sure so long as we are talking about driving on the street. It has a lot of rotating mass that has to come to dead stop and reverse it's rotational upon each shift. The TH400 is a massive tranny designed by GM to motivate all of the heavy cars in the GM stable with a lot of power (behind big blocks and High Output small blocks). The TH400 can be built to withstand about a thousand horse but at a price. If your thinking of going this route be advised that there is now available a six speed OD tranny from Allison that is supposed to be unbreakable (I said "NEW" not the old school bus Allison, this one has a computer built into the tranny so it doesn't need an external computer). Additional bushing area, close attention to bushing clearance, blueprinted pump assembly, select cores used, and other areas that our experience has shown other shops and builders are not paying attention to.The TH400 with an OD is called a 4L80E (E stands for electronically controlled by a remote computer). It has several key modifications that increase it’s strength. Stage 1 TH350 is reliable to over 500 HP/TQ. Providing a REBUILDABLE core will be a credit toward your build price. All TH350 builds now have a $450 core charge due to core shortages. All TH350 transmissions include a new pan. Our base model TH350 has lived at over 600 HP reliably.Īs with all Jake’s Performance transmissions they include all new friction clutches, bands, steel plates, soft parts, filter, modulator (if applicable), as well as hydraulic upgrades, and other modifications depending on power level. Our goal is to provide long term reliabilty. There are aftermarket planets available to make them live at even higher power levels but we usually recommend a TH400 for a dedicated 600+ HP application. The limiting factor is the stock planetaries. We feel they are a very good choice in cars up to 600 HP/TQ but capable of up to 800 HP/TQ especially in lighter cars. Deep into the 10’s without failure, they have proven to be a very tough unit for a reasonable price. We have an excellent track record with our TH350’s.
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