4T65E High Performance Rebuilds

We take a lot of pride in our performance rebuilds. It is a big investment and we provide a lot of details so you know what you are really getting- so please take the time to read our details below!

Listed pricing is for the cost of the transmission ONLY! 

Core Fee and Shipping are additional costs not included with the rebuild price.

Common core fees for HPSx rebuilds:

- LS4 5.3 V8 HD $700

- Most GM V6 HD $450

Every Transmission is built to order. We do not stock high performance rebuilt transmissions as there are too many variations from model to model and year to year to cover everything.

- New rebuild order lead times are approximately 6-8 weeks

4T65E-HPS1 $2,995.00

A great upgraded transmission with years of proven reliability!

Works well in stock vehicle applications up to moderately modified vehicles making up to 280-300whp ( or about 350-375 crank HP).

Each High Perf rebuild is custom tailored to match your vehicle and performance level keeping in mind your current and future plans. With several hundered High Performance 4T65E rebuilds in the books since 2001 we have learned what works very well and a number of great combinations to be reliable with a wide array of power levels. 

Our 4T65E-HPS1 / Base High Performance Street/Strip model will work well in a wide range of power levels from stock to roughly the 280-300whp level which is getting into the low 13 / high 12 second quarter mile mark. For power levels and goals higher than this we offer a few upgrades to keep the transmission durable and the main weak links of the 4T65E are the input shaft and the factory dual chain set and we can help which upgrades are best for your application. 

We suggest this model over our Standard Replacement type rebuild for the factory supercharged cars and LS4 5.3 V8 cars due to the higher output of these engines in stock form. The 4T65E has basically no internal calibration changes between all of its models and options so this means that a transmission that was built for a 180HP engine is the same setup from the factory found behind the 300+HP LS4 5.3 V8 engine equipped vehicles. PCM/TCM tuning has a lot of effect on how these transmissions work and also has a direct effect on shift firmness and feel since the line pressure and shift points are controlled electrically and this is what helps make this transmission very versatile from the factory but has its limitations in the performance world. transmission and not having to heavily rely on an aggressive tune. 

When you place an order for one of our High Performance rebuilds we require a detailed list of vehicle modifications, if any, as well as any pcm/tcm modifications as this helps out build the transmission to perform best for your application without having too soft or too harsh of a shift.

Below is a basic list and starting point of what goes into all of our High Performance rebuilds:

- Thorough inspection during disassembly

- Any questionable or excessively worn hard-part is replaced

- Hardened 4th clutch shaft

- New Morse HyVo HV-093 V8 spec Gemini chain set

- New Seals, gaskets, o-rings, and teflon sealing rings. Long style lip seals where applicable

- Filter

- Borg Warner clutch plates and modified clutch stack-up for improved shift feel

- High Energy style 3rd friction plates

- High Energy Forward Apply Band

- High Energy 2-1 Coast Band

- New thrust washers

- Common failure bushings replaced, others inspected and replaced as needed

- New stator support bearing

- Select bearings replaced standard, others inspected and replaced as needed

- Improved input sun gear on early models 

- Reconditioned input clutch piston

- Borg Warner EPC for 97-02, OE AC Delco/Bosch for 03+ model years

- Borg Warner TCC PWM solenoid

- OE AC Delco shift solenoids

- Pressure switch manifold cleaned and tested, replaced as needed

- Wiring harness thoroughly tested and replaced as needed

- Sonnax Sure-Cure kit which includes these upgraded parts

- TCC apply valve

- TCC regulated apply valve

- TCC relief valve

- Improved design boost valve and sleeve

- AFL valve and sleeve

- Lube tube retainer, improved check balls, pump slide pivot pin

- Transgo Shift Kit.

- ALL of our 4T65E-HPS1 rebuilds include a reman torque converter!

- 12 Month / 15K mile warranty on ALL High Performance rebuilds! 

Need a transmission to handle more power than our 4T65E-HPS1 ? please see upgrade options below!

4T65E-HPS1.5  $3,449.00

Upgrade option for the HPS1- Add a stronger 300M Alloy input shaft to raise power handling! This is a great option to retain the good drivability manners of our HPS1 rebuild but need a bit more strength. A more fitting trans for builds in the 300-325whp range but will also work in stock applications planning to upgrade down the road. Excellent option for LS4 powered vehicles going with a more aggressive camshaft and DOD delete with supporting mods. 

4T65E-HPS2 $3,995.00

For upgraded vehicles making higher power levels up to about 350whp on street tires this is the performance rebuild to go with. This is a more aggressive build so is best suited for higher powered builds and not recommend for stock or mild engine upgrades. Once you starting making over about 280-300whp the stock input shaft becomes a weak link and can shear off in the tcc o-ring groove area. An upgraded input shaft offers a much higher power handling level and is included in our HPS2 rebuild. We also set up the valve body and clutch feeds a bit more aggressive for quicker and firmer shifts to accommodate the higher power levels.

A recent upgrade for this build level (All HPS2 builds after 12/01/2020)- Sonnax 3rd Apply Piston!

Our 4T65E-HPS2 High Performance rebuild includes everything our HPS1 offers PLUS -

- 300M alloy Upgraded Input Shaft

- Sonnax Performance Ratio Boost Valve

- Additional accumulation and clutch feed modifications (matched per vehicle)

- Sonnax Oversized 3rd Clutch Apply Piston Kit