It is only used in high performance vehicles and performance cars, otherwise the 8L45 is more than enough for the job. 700R4 Transmission-Chevy 700R4 Level 2 700 Raptor Junior 2599.00 Select options 700R4 Automatic Transmissions Level 1 700R4 Transmission Upgraded torque converter servo sprag and pressure valve 1849.00 Select options 8L90 Performance Master Kit with Raybestos GPZ Clutches and Bonded Pistons 745. Since the 8L90 has only been available for a few model years(production started in 2014 for the 2015 model year). That is proof positive that the vehicle in question was at a minimum equipped with the 8L90 from the factory. They can be found in the glove compartment of the vehicle in question. In addition, a TH350-C added the lockup torque converter capability and was introduced in 1979. This transmission was in production for about 15 years, being fully replaced by the 700R4 in 1984. The easiest way to determine if your vehicle is equipped with an 8L90 is to utilize the RP0 codes. While the phase-in began in 1969, it was not complete until the 1973 when the Powerglide fully phased out. There are a few minor differences between the standard version and the LT1. The 8L90E is the transmission GM chose to put behind the ultra high performance LT1 engine.
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The 8L90 offers a true manual paddle shifting experience. This allows for extremely tight shifts in a relatively small space. The 8L90 has four different gears sets and five clutches. There’s more on this specific version of the transmission below. The max power and torque specs bump up a little when it is put behind the LT1/LT4 engines. Through a combination of lightweight materials and wizardry, GM engineers were able to get the 8L90 to weigh in a couple of pounds less than the 6L80E, and keep it roughly the same size. Like most GM automatic transmissions that have come before it, the 8L90E has an aluminum case, overdrive, and can handle a lot of power. The addition of the two extra gears allows the 8L90 to realize a real world 5% fuel economy improvement over the 6L80. The addition of two extra gears over the previous generation 6L80 was necessary to meet ever tightening Federal fuel economy laws.
It is an incredibly advanced transmission and has the technology to perform at a high level in the Corvette, while at the same time being cost effective enough to use in high volume production. Structurally, the 8L90 is similar to the 8L45, except that it is made to handle more power and torque. It is currently phasing out the 6L80/6L90 transmissions (although it hasn’t done its all the way yet. The 8L90E is an 8 speed automatic transmission developed by General Motors and introduced for the 2015 Model year.