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Performance T-Case Build Service - EVO 8-9


EVO 8 & 9 Transfer Case Performance Build Service. This is for ACD and NON-ACD.

The difference between the Standard and this Performance build is this one includes the Jacks Trans Spec Ring and Pinion Gear Set along with additional upgrades for greater reliability above OEM power levels.

This rebuild includes:

  • Jacks Trans Spec Ring and Pinion Gear Set
  • OEM Pinion Shaft Bearings
  • Upgraded Case Bolts (8MM to 10MM) to Prevent Case and Gear Breakage
  • Tighter Bearing Preloads
  • OEM Fill / Drain Plug Washers
  • OEM Seals and O-Rings (excludes ACD Piston Seals)
  • Complete Tear Down and Cleaning using state-of-the-art equipment HERE
  • Pressure Testing ACD Assembly (checks to ensure piston seals are healthy and fluids do not mix)
  • New ACD Seals (Piston and Hub) are available, if needed. (additional charge)

Please note that if your T-Case is making whining noises then the ring and pinion gears are wiped out. Don't worry!  This rebuild will take care of that issue.


WPC is a permanent surface treatment that reduces friction while strengthening the part. Its unique micro-dimple formation pattern greatly reduces friction and is unmatched by conventional methods of surface treatment. It is a proven process that has been utilized for many years in the racing and automotive industry and is complimented by utilizing our micropolishing service. WPC can strengthen parts in two ways. First it adds an extremely high level of compressive stress at, and near, the surface. The second, is that the WPC treatment creates a Nano - Crystalline structure at the surface of the metal. Both of these mean that metal fatigue and crack initiation are both noticeably reduced; thus strengthening the gears and shafts inside of the transmission.


This rebuild has been known to work in cars with enough power to squeeze into the 10s, but we recommend it for cars no faster than 11s in the 1/4 mile.  The reason for this is due to the weak front diff inside the T-Case.  If you do not upgrade the OEM diff, there is a risk it can break when you put a good amount of power and shockload through the T-Case. The Wavetrac LSD is the strongest differential you can buy for the EVO transfer case and is a part you will never have to worry about breaking.  This diff also has an added cam inside to allow for LSD action even in a straight line!


With the best cleaning equipment, we also have a very clean facility.  All units are built in a spotless environment and using tools, and benches, which are clean and only used for assembly purposes.  In other words, the same tools used to pull your dirty old t-case out of your car are NOT the same tools used to rebuild your pristine unit afterward. Take a look at the typical shop and check their tools.  It is shocking how dirty things are in most shops and that dirt will end up in your unit.  That doesn't happen here. 

Your unit is also shipped in a double walled custom made box for Jacks Transmissions.  Your unit will be sitting snugly, and safely, in preformed foam pads to assure a trouble free delivery.



Please EMAIL us for price and availability. Many of the build services we offer can be performed on an 'exchange' basis. Core charges and core convenience fees are separate from the costs of the build service. In many cases, core fees can be refunded pending the condition of what we receive. Note: We will retain a 10% convenience for this service.


We love the Mitsubishi trans and have not forgotten that it's these units which got us to where we are today.  We will continue to service them as we want to continue to support the community.  This is a great opportunity for the Mitsubishi enthusiast to have a build using the same high-end equipment to service the Mitsubishi trans as we use for the expensive exotic units.  This means that the cleanliness and attention to detail is unmatched! 

All machine work, cleaning and detail work is performed in-house by very talented technicians and engineers.  The quality you get from Jacks Trans at the price we have listed is an unbelievable bargain.  We do not know of anyone else which cleans the trans via a 110gal ultrasonic and Pulse-Jet unit, or employs such talented people.

The quality and experience you get from Jacks Trans shows with the overwhelming number of high-end vehicles we now service at the shop.  Be a part of the rare opportunity to have one of the cleanest and most experienced shops in the World service your trans! 

Our pricing structure was created to assure only the highest quality materials and workmanship.  Anyone which beats our price is taking short-cuts which you will pay for in the end.  Look into the details of our rebuilds and you will see the additional attention we provide which is unique and can't be duplicated.  We would be honored to keep the EVO tradition alive and service your trans! 

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