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The PerformaBuilt Rocks-Mud Crawler Transmission

You are looking at the PerformaBuilt Rocks Crawler and Mud Crawler Series transmission.

BeastThese units are built very similar to our Pro Race units, but the focus is on durability while maintaining reasonable shift quality. These were specifically developed for commercial, heavy towing, and 4x4 vehicles. The shift on these units is designed to take the abuse and work associated with these vehicles but without the tire chirping shifts of our race and performance units.

200BandThese units feature a heavy duty pump with staked bushing, full-time lube modification, to keep the heat down, and modified lockup valve to improve the lockup converters durability so you can tow confidently in overdrive.

We use a heavy duty wide band for max hold in second and fourth gear. To compliment this we use the Corvette servo. This servo is the largest servo available from GM it will supply the clamping force needed for these heavy units but without the excessively harsh shifts associated with the aftermarket super servos.

SpragThen for Fourth (OD) we use the sonnax dual piston servo. This servo has 30 percent more holding force than the stock overdrive servo. That accompanied with the 20 percent wider band will let you tow in overdrive with confidence. Now you have near double the load capabilities of the stock transmission in overdrive.

CorvetteNext we use carbon composite frictions in the forward clutch. These frictions have an outstanding friction coefficient for max holding. This clutch has superior temperature capabilities so they don't burn easily in even the worst conditions. This is important because this clutch has to bear the load in every gear except reverse.

For the 3-4 clutch we use Raybestos Zpack equal to 30 percent more holding in this critical pack which must handle full engine load in both 3rd and 4th gears. This set has shown to be an excellent upgrade.

We next attack the weak link in the particularly heavy vehicles and vehicles used for heavy loads or 4x4 where there is constant shifting from first to second and reverse is used for more than backing out the drive way - the sun shell. To address this, we use only THE BEAST. These sun shells do not break as they are nearly twice as thick as a hardened or new OEM shell and have a welded reinforced collar. You will not have to worry about that sudden loss of reverse and 1st and 3rd gears associated with the breakage of this peace.

PumpMoving on to the planetary, both sun gears are machined with slots to increase lube flow. This is a must in these heavy duty units. A lack of lube and cooling is a killer when pulling the boat, camper or that work trailer loaded down with equipment. The Rock Crawler and Mud Crawler Series uses 4 pinion planets.

For this unit we only use the thicker K case like is used in the very high performance cars and 4x4 trucks. You won't have to worry about cracked bell housings and cases.

SonaxLastly we address the valve body. Here we perform all the updates for lube and durability, eliminate the partial lockup function in the 4L60E. This greatly extends the converter life and helps to keep everything much cooler. Next we improve the flow to the 3-4 clutch making sure it has enough supply to help ensure that it holds the load on this crucial shift. We then enlarge the apply release feeds for the lockup clutch to make it apply positively to avoid converter clutch burn up under heavy load. Finally we include a low stall heavy duty carbon composite lockup clutch torque converter.

Note: The 99 up LSX based transmissions do not include a converter. Please contact for price and availability.

As with all our units shipping is free in the mainland USA and there is no core charge! And since we know you need your truck handing time is 4 days or less in most instances. Shipping is to your residence or any business address with no additional charge, This unit comes with our PerformaBuilt warranty for 1 year regardless of the miles you drive! If it dies you simply return it and we get another one or the one you returned right back to you within days not weeks, Warranty is limited to repair of the transmission at our facility, we are not responsible for any other loss incurred, wages, R&I cost or any other loss.



700R4 4L60 4l65 1982 TO 2006 LT-1 & V6 3.4, 3.8, 4.3, 5.0, and LSX 4l60E and 4L65E STYLES 4.8,5.3,5.7,6.0 CARS AND TRUCKS.



This unit comes with a converter up to a 2500 stall at no additional cost and has a 2 year warranty.

If you have any questions feel free to call 1-888-744-6542 anytime or 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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