PerformaBuilt Logo
GM Cars


If you have any questions feel free to give us a call 570-578-5686

Or for online chat:

These converters feature hand-brazed impellers, heavy-duty stators, Torrington bearings instead of washers, a specially machined surface for additional cooling, performance extreme duty sprag assemblies, special high heat high, high friction carbon composite converter lockup clutch lining, and a 4140 chrome molly steel hub. These units are built tough and to your custom needs. These are not off the shelf units!

Our 9.5 inch Pro Race Series converters are available in 1.69, 2.1 and 2.5 STR in stalls from 2800 to 4000 RPM stall.

To help you choose, here is some additional information about stall torque ratio. Stall torque ratio is the multiplier for torque for a short time when the car is launching. Higher STR will give a much higher torque multiplication for a very short time right at launch, but with an overall cost in efficiency at the top end. In other words, higher STR will increase your 60 ft times, but it may be at the expense of MPH at the top end. Lower STR, while it will not deliver the punch at the bottom like a higher STR, will give torque multiplication for a longer period of time and may allow you to place more power to the ground with less spinning. Additionally, the over all efficiency is much better. Where a 2.5 STR might be only 90 percent efficient above rated stall, a 1.69 would be 96 percent efficient above rated stall (both these numbers based on converter not locked). This means you put more power to the ground throughout the run down the track. Each person has different needs and goals, which is why we offer multiple STR.

We offer the finest performance torque converters on the market today.

All our converters are warranted for 1 year.

All prices include shipping inside mainland United States. No core is required!

If you have any questions feel free to give us a call 570-578-5686

The more we know about your needs, the better we can match you with the right converter. You must CONTACT US so we can make sure your converter is properly built for you.

The information we need is:
Engines size
Dyno (or estimated) horse power
Actual torque
Vehicle weight
Rear end ratio.

You can get any stall inside this range, within 100 rpm, depending on the parts combinations necessary to get the requested STR and stall speed. Prices are shipping included to anywhere in the mainland USA. You will not be disappointed with this converter!

2800 to 5000 stall 9.5 in. 4L80E with lockup

9.5 Inch 4L80E Style $795 .00 BUY NOW