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The PerformaBuilt Performance 350 Transmission

The PerformaBuilt Performance TH350 Transmission comes in two styles: The Full Auto/Manual Stick, which allows you to hold any gear to any speed and down shift at any speed. And the Full Manual Valve Body style which allows you to start in any gear and is not restricted by governor or modulator pressure regardless of speed or rpm. The FMVB version is intended for the track only, whereas the Auto/Manual Stick is street friendly.

Its features include the following components and modifications (nothing but the best):

1. The case of each unit is carefully inspected, checked for cracks and stress, and cleaned in our heavy duty parts cleaner. Then the case is heated to approx 250 degrees to remove all water and to allow for additional inspection and testing. As the case cools it is painted with a high gloss paint/sealant providing an excellent finish and sealing it from the elements.

2. The low reverse piston is then inspected and replaced as needed. These are a high-stress point in the TH350 when used heavily for manual down shifts. New seals are installed, the piston is carefully installed in the case and static air tested for proper "apply".

3. The rear planetary set is then inspected and installed in the case, followed by the high energy low reverse frictions and new steel pressure plates, all set for ideal clearance for racing and high speed down shifts. Next, the heavy duty low roller clutch and support are installed along with the case reinforcement insert.

4. The sun shell and gear are then inspected and installed with bushings to ensure a good center clearance, which is important for high rpm driving. The front planetary is inspected and installed along with the shaft support clip. The rear end-play is checked and adjusted as needed to precise tolerances.

5. The forward clutch drum is carefully cleaned and inspected before the piston and seals are replaced into the drum. Then the new Performance high energy frictions and heavy duty new steels are installed. The wave cushion plate is omitted, when possible, to add an additional friction.

6. The direct clutch drum is then inspected before the piston and seals are placed into the drum. Heavy duty high energy frictions and heavy duty steels are installed. This drum is also modified to increase the apply area of the piston by 100 percent over the stock setup.

7. A hardened intermediate clutch race and heavy duty roller sprag are then installed on the direct clutch drum and it is placed in the case. The intermediate overrun band is installed, followed by 3 heavy duty high energy intermediate frictions.

8. The Pump is now inspected and the bushing and/or gears are replaced as needed. Seals for the intermediate piston are replaced and the return cage modified. New hardened metal sealing rings are installed on the pump shaft. The pump is then carefully aligned and installed.

9. The valve body is carefully cleaned and disassembled, all the valves are checked for wear and proper movement, and the PerformaBuilt Performance Shift Kit is installed according to the order preference. Additionally, a new adjustable modulator is installed.

10. The pan and tail housing are now installed.

11. No speedometer gears are installed in the unit, but they are available at additional cost. The units can be set up for VSS (vehicle speed sensor). Prices are shown.

These Transmissions are for the all out race enthusiast. Shifts are very aggressive - more so in the full manual version. This unit is built to take a beating and will live up to the PerformaBuilt name


350 Performance 350 Transmissions

Auto-stick valve body $1375.00


Full manual valve body $1575.00


To add reluctor and tail housing to support VSS please come back to page and click the buy now button below also. Its and additional $75.00


For converters please see the converters page. Link is at top of this page.



If you have any questions feel free to give us a call 1-888-744-6542

Or for online chat: K

The more we know about your needs, the better we can match you with the right transmission.

NOTE: All units are available in either 2wd or 4x4. If you have a special application requiring a special adapter or output shaft, please contact us and we will be happy to provide it and quote a price for your special application.


Read our complete warranty Here.



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*Free shipping applies only to orders with a shipping address inside the continental United States- (Excluding Alaska & Hawaii).** Warranty is limited to the statement contained on the warranty page on this site. There are no other warranties express or implied. In the event of limited specific brand availability or in the interest of improving our products PerformaBuilt reserves the right to substitute equivalent or better parts in our rebuilds.

Primary address is: PerformaBuilt Transmissions, 50 Slusser Lane, Sugarloaf PA, 18249. Phone Numbers for primary contact are: 1-888-744-6542 & (570)-578-5686. Primary email address is: info@performabuilt.com. Copyright 2009 PerformaBuilt Transmissions. Do not copy/paste or use any part or portion of this website for any purpose without express written permission from PerformaBuilt Transmissions.

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