6L90 Performance Transmission Rebuild Kit - Level 2.5
Rated up to 700 RWHP, HP ratings are contingent on numerous factors, such as tune, vehicle weight, power adder, use, etc. | Detailed Instructions Included | FREE UPS Ground to the contiguous United States (lower 48)
Kit is designed with stock dimension 36-tooth 4-5-6 clutch plates and will work with the OE intermediate 4-5-6 clutch hub. CDT's Billet 4-5-6 clutch hub and intermediate shaft (CDT part number 104690-36) is included in this kit. The 4-5-6 clutch pack provides 14% more surface area than a stock clutch set up. The 3-5-R clutch pack offers 20% more clutch area than stock.
In stock items ship within 1-2 business days.
Picture for representation purposes only. Actual contents may vary as we continue to develop our products.
CDT456L2.5/90 (4-5-6 CLUTCH KIT)
8 Borg Warner® Clutches
7 Lindered Steel Plates
1 Apply Plate
1 Backing Plate
1 Snap Ring
2 Bonded Pistons
CDT456L2/90 offers 14% more clutch apply area than stock. Lindered is a chemical and heat treatment process that hardens the steel, which results in less wear.
104690-36 (BILLET INTERMEDIATE SHAFT & 4-5-6 CLUTCH HUB) One piece 300M steel forging is heat-treated and shot-peened for maximum durability. This shaft doubles oil flow to the clutch pack for improved resistance to heat and longer clutch life. It is designed for use with the OE dampener to minimize risk of chirp/squawk. The hub is designed for OE steels and clutches.
CDT35RL2.5/90 (3-5-R CLUTCH KIT)
6 Borg Warner® High Energy Clutches
7 Kolene® Steels (varying thickness)
1 Backing Plate
1 Snap Ring
CDT35RL2/90 offers 20% more clutch apply area than stock. High Energy material maintains consistent frictional behavior and tolerates extreme thermal stress applications. Kolene steels provide a surface treatment that enhances wear & fatigue resistance.
CDT26L2.5/90 (2-6 CLUTCH KIT)
6 Borg Warner® Clutches
6 Steels
1 Snap Ring
1 Hi-Per Blue® Bonded Piston
Hi-Per Blue® Pistons are manufactured with upgraded High Performance Blue AEM material for superior thermal and chemical resistance with better fit and performance.
CDT1234L2.5/90 (1-2-3-4 CLUTCH KIT)
6 High Energy® Clutches
6 Steels
1 Snap Ring
1 Spiral Snap Ring
1 Snap Ring Kit
1 Hi-Per Blue® Bonded Piston
High Energy material maintains consistent frictional behavior and tolerates extreme thermal stress applications. Hi-Per Blue® Pistons are manufactured with upgraded High Performance Blue AEM material for superior thermal and chemical resistance with better fit and performance.
CDTLRL2.5/90 (LOW-REVERSE CLUTCH KIT)
6 High Energy ®Clutches
6 Steels
1 Hi-Per Blue® Bonded Piston
High Energy material maintains consistent frictional behavior and tolerates extreme thermal stress applications. Hi-Per Blue® Pistons are manufactured with upgraded High Performance Blue AEM material for superior thermal and chemical resistance with better fit and performance.
CDTVBPKL2.5/80-90 (VALVE BODY & PUMP KIT)
2 Boost Valve Springs
2 Clutch Regulator Valve Springs
1 Center Support Seal Kit
1 Pressure Regulator Valve Kit
1 Line Pressure Booster Kit
1 O-ringed End Plug Kit
1 Pump Slide Spring
CDTMKL2.5/90 (MASTER KIT)
1 High Performance Overhaul Kit engineered utilizing premium materials for racing.
1 Bonded OE Valve Body Plate
1 Bushing Kit (includes extension housing bushings)
1 Pan Gasket
1 Filter
1 Oversized Pump Washer
PLEASE NOTE: GM has a transmission that has the same outside dimensions as a 6L90 but uses one less clutch in all the clutch housings compared to a true 6L90. We call this transmission a 6L90LCC (less clutch capacity). Please refer to "Stock Clutch Capacity Chart" and "Length of Main Case Chart" on the "Transmission Specs" tab below to determine if you have a 6L90 or 6L90LCC. When ordering this part, please indicate in the Notes textbox above that you have a 6L90LCC.
We do not include welded hubs in Kit. In the beginning of R&D on this transmission we thought this area needing strengthening. However, in all the units that we've rebuilt we've NEVER seen one broken. Therefore, we deemed it unnecessary. Also, we do not include a billet pump rotor because the factory pump rotor has proven itself reliable (we have never seen one broken) unlike the 4L60E.
