845re vs 8hp70 Transmission
845re vs 8hp70 Transmission. So, you have a brand-new car and you’re ready to get it on the road. Your mechanic has told you that your transmission needs an upgrade in order to handle your driving style, but is having a hard time recommending what to purchase. 845re vs 8hp70 Transmission differences are-
| 845re Transmission | 8hp70 Transmission |
| 845re Transmission has more power than 8hp70 Transmission. | 8hp70 Transmission has less power than the 845re Transmission. |
| 845re Transmission has a more fuel-efficient system. | 8hp70 Transmission has a less fuel-efficient system. |
| The reverse gear is bigger in capacity and longer than 8hp70 Transmission. | The reverse gear is smaller in capacity than the 845re Transmission. |
| The reverse gear to forward gear ratio is bigger in the 845re Transmission than 8hp70 Transmission. | It has a smaller ratio on reverse gear compared with the 845re Transmission. |
845re Transmission
The 845RE is the latest version of re-manufactured transmissions designed for use in light trucks and SUVs. It’s a re-manufactured eight-speed transmission fitted with an electronic shifting system and electronic line locks that are designed to provide smooth shifting, lock torque to the wheels, and better drivability over many UJ or NVH issues you’re used to with stock transmissions.
The 8HP70 is a refined version of the latest generation of electronically controlled automatic transmissions. It’s designed to deliver improved response, shifting, and launch control, while providing greater efficiency and durability.
The 845RE offers a few advantages over the 8HP70 transmission. These advantages include:
Better Fuel Economy (According to Chrysler engineers, the transmission will be more efficient and deliver better fuel economy than its counterpart.
845RE TRANSMISSION KIT
The 845RE offers a wide variety of transmission gear ratios, both 2.92:1 and 3:1, with the ability to change ratios manually using the D8TKA transmission control module (TCM).
The 845RE is fitted with a Lockup Converter (LUC) which is used to lock the 7th gear of your transmission in place. The LUC replaces the stock planetary gear set found in most transmissions which allows you to unlock the 7th gear of your transmission when shifting into park or reverse.
Features:
- 6-Speed Automatic with Electric Shift
- Electronic Line Locks
- Electronic Torque Converter Clutch Lockup Control
- Starters & Alternators are Replaceable Using OEM Style Mounting Brackets and Hardware.
8HP70 Transmission – 8-speed automatic transmission designed for high performance. This is the same transmission found in F-150, Raptor, BRZ/FR-S/86 Subaru, Cadillac ATS, and 2013 – 2018 Corvette Z06.
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845RE Transmission Valve
The valve for the 845re transmission is a hydraulic solenoid valve. The hydraulic solenoid is similar to the hydraulic solenoid in the torque converter and is controlled by the ECM or TCM while the actuator opens or closes a passage in the valve.
The ECM operates much like a car’s engine computer: it receives numerous inputs from sensors throughout the system, then sends commands to individual components, such as the 845re transmission solenoid.
Features:
- Electronic Torque Converter Clutch Lockup Control
- Starters & Alternators are Replaceable Using OEM Style Mounting Brackets and Hardware.
Starters, Alternators, and Solenoid Valve are all located on the back of the transmission bell housing. The solenoid valve is a coil-on-plug assembly that is mounted to a bracket in the transmission which has two shafts that rotate across each other. One shaft has two positions, either locked or unlocked/run.
8hp70 Transmission
The 8HP70 transmission is the first eight-speed automatic transmission designed and manufactured in-house by General Motors. It was designed to replace the six-speed 6L80/6L90 and provide better fuel economy, high performance, and improved towing capability in GM trucks & SUVs.
8hp70 features three overdrive gears for improved fuel efficiency. The transmission also uses a wider input/output shaft that enables it to handle greater torque loads compared to previous six-speed automatics.
The transmission uses four smaller, oil-cooled planetary gear sets versus the older six-speed transmission’s larger two-part planetary gear set.
8HP70 Transmission Master Kit
The Master Kit is a complete transmission repair/service kit that includes all of the necessary parts and tools needed to service and repair GM 8-speed automatic transmissions. Most of the components in this kit have been used on a daily basis in real-world applications -with some exceptions.
Features:
- 6-Speed Automatic with Electric Shift
- Electronic Line Locks
- Electronic Torque Converter Clutch Lockup Control
- Starters & Alternators are Replaceable Using OEM Style Mounting Brackets and Hardware.
8HP45 Transmission Control For JAGUAR
Vehicles equipped with 8HP45 transmission control are Jaguar XJ and F-type vehicles. The TCM is responsible for the operation of the transmission’s shifting mechanism, among other things.
Features:
- 6-Speed Automatic with Electric Shift
- Electronic Line Locks
- Electronic Torque Converter Clutch Lockup Control
- Starters & Alternators are Replaceable Using OEM Style Mounting Brackets and Hardware.
What is the difference between 8HP45 and 8HP70?
The 8HP45 uses a mechanical torque converter for the input shaft. The 8HP70 has an electronic torque converter for the input shaft.
8HP70 Transmission Control Module
With the introduction of the new eight-speed automatic transmissions, GM developed a new transmission control module (TCM) that replaced the previous TCM used in both 6L80 and 6L90-equipped transmissions. Some TCMs were re-programmed to work with the 6hp45 and 8hp45 transmission control modules.
What is the 845RE transmission?
The 845RE is the latest version of re-manufactured transmissions designed for use in light trucks and SUVs. It’s a re-manufactured eight-speed transmission fitted with an electronic shifting system and electronic line locks that are designed to provide smooth shifting, lock torque to the wheels, and better drivability over many UJ or NVH issues you’re used to with stock transmissions.
Who makes the 8HP70 transmission?
GM designates the 8HP70 transmissions as an Independent Manufacturers’ Part. GM built the transmission, but other manufacturers manufacture parts for it. GM specifies two overdrive gear sets and one direct-shift gear set.
What is the difference between 8HP75 and 8HP70?
The 8HP75 is a heavy-duty, more robust 8-speed transmission that was designed with durability and superior performance in mind. The new transmission was developed to provide maximum torque capacities of 610 lb-ft (845 Nm) at 2400 rpm, as well as excellent real-world fuel economy.
Although there are many internal similarities between the two transmissions, there are a couple of major differences. One difference is in input/output shaft size.
What cars use 8HP70 transmission?
The GM 8-speed transmission was designed to improve fuel economy and performance over the previous six-speed transmissions. Both the 6HP45 and 8HP70 found their way into a variety of applications such as 1/2 Ton and 3/4 Ton Trucks, Full-Size SUVs, and some Vans.
Applications
- 2015–present Chevrolet Colorado
- 2017–present GMC Canyon
- 2017–present Chevrolet Silverado 1500
- 2017–present Chevrolet Silverado 2500 / 3500
- 2016–present Chevrolet Tahoe
- 2016–present GMC Yukon
- 2017–present Cadillac Escalade
- 2018 Holden ZB Commodore (VFII) (Australia) 2018 Camaro ZL1
- 2009+ Suburban and Tahoe/Yukon XL with 6L80, 6L90, or 8L90 transmissions
- 2015+ Chevy Camaro 1LE
- 2016+ Camaro ZL1
- 2016+ Corvette Z06 and ZR1
- 2014+ Sierra 1500, Tahoe, Yukon; Denali
- 2017 Sierra 2500/HD and 3500/HD
- 2017+ Silverado 3500/HD
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Is the ZF 8 speed reliable?
Yes, This is a question that’s been asked and debated heavily since their introduction. Many people have found the 8HP70 transmission to be more reliable than many of the competitors on the market.
When it comes to reliability, there are many different factors that come into play, especially with the eight-speed transmission, but the main factor is proper maintenance. The ZF 8 speed is designed for easy service and should be serviced about every 30k miles, or any time an issue arises.
What Transmission is in Scat Pack?
The 8HP70 is currently in the Scat Pack.
Some of the features found on the 8HP70 include:
- Eight forward speeds give excellent acceleration throughout the power band.
- A smaller 6th gear ratio provides more efficient cruising on highways for improved fuel economy.
- A wider ratio spread and higher capacity design improve towing performance.
- An electronic line lock (ELL) unlocks the front brakes for burnout or to help get a vehicle moving when stuck in mud or snow.
Is the ZF 8-speed a dual-clutch?
There are some individuals that refer to the ZF 8-speed as a dual-clutch transmission. This is not correct. The ZF 8-speed transmission uses similar technology to a dual-clutch transmission but is actually an automated manual transmission with an electronically controlled clutch.
Who uses ZF 8-speed?
The ZF 8-speed transmission is being used in vehicles such as the Corvette, Camaro, Holden Commodore (VF II), Holden Caprice, Ford Falcon XR8 and XR6 Turbo, and Jaguar F-Type.
Does Ram still use Aisin transmission?
The Ram 1500 currently uses the Aisin AS69RC eight-speed automatic transmission. The Aisin AS69RC transmission is designed and manufactured by Aisin Seiki, a Japanese unit of Toyota Industries Corporation (TICO), and is produced at the Aisin plant in Kokomo, Indiana.
There has been some confusion over whom Aisin is. The company was founded in 1914 and is involved in the auto parts industry. In 2004, Aisin acquired Redline Auto, which (like many other companies) changed its name to Aisin due to a conflict with a competing stock ticker symbol.
Which Audis have the ZF transmission?
There are a total of five Audi models, starting with the A3 first, followed by the Audi S3, TT RS, TT RS Spyder, and R8 V10.
Audi RS5 – The Audi RS5 is a fastback and saloon/sedan which was launched in 2005 and is available in 2.7L I6 (350PS) and 3.0L I6 (380PS). In 2009 it was replaced by the updated Audi S5 model of the same name.
Is 8-speed automatic fast?
No. This is a very common misconception because of the big number eight that gives such a fast transmission. It is not a fast transmission.
Eight speeds are good for fuel economy and for good performance, but not for performance. In order to get the best performance, the 8th gear should be eliminated, and it should have more gears altogether.
Is there an 8-speed manual transmission?
No, Although the 8-speed is not a dual-clutch transmission, there have been some enthusiasts that have experimented and put an eight-speed manual transmission together.
The idea behind the 8-speed manual is to make things more simple. Although many of the current manual transmissions today have six or five speeds and a clutch pedal, drivers can easily get confused about which gear they are in. An eight-speed automatic will eliminate this confusion and is also easier to use than an eight-speed manual.
What is the difference between 850RE and 8HP75 transmission?
The 850RE was an 8-speed automatic transmission that was used in the older generation of GM vehicles. The 8HP75 transmission is an upgraded version of the 850RE and can be found in a number of older GM vehicles.
The 850 RE has been replaced by the 8HP75. The transmission was used in the 2005–2014 Chevrolet Silverado 2500HD and 3400HD. Five-speed automatic, with a high-output torque converter.
The transmission was used in the 2005–2014 GMC Sierra 1500 HD and 2500 HD. Six-speed automatic, with a high output torque converter. The transmission was used in the 2005-2014 Chevrolet Colorado and GMC Canyon.
What cars use the ZF 9-speed transmission?
The ZF 9-speed transmission is an ultra-high-performance 9-speed automatic transmission manufactured by ZF Friedrichshafen.
The ZF 9-speed transmission features 3 modes, including Sport mode for more responsive shifts and a manual shift mode that includes steering wheel paddle shifters.
The ZF 9-speed transmission has been used in the 2014–present Audi TT RS, 2015–present Audi R8, 2015–present Mercedes-Benz E63 AMG, 2016-2018 BMW M2, 2016-2017 Cadillac ATS-V, and CTS-V
FAQ
Is Aisin better than Allison?
- Aisin and Allison are two different transmission companies.
- Aisin makes transmissions for Nissan, Isuzu, Subaru, and others.
- Allison makes transmissions for Fiat, Chrysler, and others.
Both companies have a good name in the auto racing world, but this is the great auto racing world and they are not the same company.
Which is better 68RFE or Aisin?
68RFE is better than any Aisin transmission. The 68RFE was introduced in 2007 and replaced the 65RFE transmission. Since then, there have been a number of updates to the 68RFE and the latest version is an 8-speed automatic transmission, with an electronically controlled wet clutch (8HP70).
The 8HP70 has been further updated to include eLock, which locks front brakes for a perfect drag race launch or to help get a vehicle moving when stuck in mud or snow.
Does Toyota own Aisin?
No. Aisin is a totally independent company, and Toyota is selling its vehicles where it makes the most business sense for them. On the Toyota website, there is a video that advertises the GT-86 which uses an Aisin transmission.
In 2007, Toyota launched the Lexus IS F for the U.S market and also used an Aisin transmission. The Aisin D4S transmission was in the Lexus LS 400 and is currently in the 2014–present Infiniti Q50.
ZF 8HP 8 Speed Automatic Transmission
Final Word
In the end, your final decision is up to you about 845re vs 8hp70 Transmission. If you’re dropping this kind of money into an engine, you’ll want to make sure that it’s right for you. You don’t want to see a couple of grand down the drain if you’re not going to enjoy the drive.