ON SALE NOW for a limited time! You get "the real deal" all at one low price! The Complete THRASHER Shift Kit just $89.95! Just call or email us today!
THRASHER Engineered Performance Shift Kit ™
You get our tested and proven THRASHER Shift Kit plus 2 piston seals and transaxle filter. Who else gives you more for your money? Our Shift Kit includes everything that we feel you can benefit from. THRASHER WILL NOT sell you unnecessary items unneeded items at an inflated cost. We prefer not to use our customers unknowingly as our testers.
Our shift kit is designed to adjust the responsivness of your shift to the way YOU like it.
You select the level you desire from mild (slight improvement in firmness over stock) to medium (noticeable improvement to reponse time) to wild (quick precision shifts offering immediate response for strip application) that best suits your taste and driving style. Whatever level you choose, our shift kit will deliver crisp shifts under light to medium throttle positions, and very firm shifts at wide open throttle.
Clutch life is improved because of the reduced shift time. Anytime you are between gears you are slipping the clutches until you reach the point where they lockup. This wears the clutches and generates heat. Less time on the shift = less clutch wear and heat buildup.
Here at THRASHER we're often copied, but never equaled. As they say, "imitation is the sincerest form of flattery".
APPLICATIONS:
1997-current Grand Prix GTP, GT, CompG
1997-current Regal GS
1997-current Bonneville SSEi
1997-current other applications using the 4T65E-HD transaxle
1998-current Monte Carlo
1998-current other applications using the 4T65E (non -HD) transaxle
2000-Current Impala NOT applicable for the 4T60E
Do I need to remove the transmission from the car? ... NO! This kit can be installed in a driveway by any competent shadetree mechanic in about 1 hour with hand tools, jack stands, drip pan (for tranny fluid), and a torque wrench. Detailed instructions are included, of course.
How does it work? Where does it go? ... The kit uses a dual spring setup (similar to a valve spring) and precision height shims which are placed inside the 1-2 and 2-3 accumulators. The accumulators are piston and spring assemblies located inside the valve body of the transmission which control the rate at which fluid pressure gets applied to the clutch packs when shifting gears. The valve body is located above the pan on the bottom of the transmission. (While you're in there you might as well change the filter.) Slow pressure rise means a soft shift. A rapid rise gives a quick positive shift yielding minimal slip.
Factors such as spring pressure, accumulator cylinder volume, piston travel, pump capacity, and line pressure all interact to yield shift time and slip. By controlling several of these parameters simultaneously the shift quality can be altered to a more <ahem> acceptable level:-)
What about electronic gizmos? ... We tried this approach and were not satisfied with the results. Raising the shift RPM and controlling the current through the shift solenoid just "didn't get the job done". We saw limited gains, but nothing worthy of the THRASHER name. No matter what you do electronically, the accumulator is a mechanical device without electronic controls that controls the rate of apply. For a more detailed explanation of why we were dissatisfied with the in-line electronics controller, see our electronic transmission pressure modifier page.
What if I select the "barely noticeable" option and later decide I want more? Do I need to buy another kit? ... Nahhh. Using our kit you can switch between the available options. We don't promise unlimited reuse, but with due care taken with the gaskets during the installation/removal process you should easily get a second (possibly three or more) shot at tuning. You can select the spring constants and piston travel to yield the level of performance that you desire.
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