We offer modified valve bodies from John Wood Automotive because it is our experience that they are one of the best offered in the industry. John Wood has been building transmissions and valve bodies since 1983 and has a reputation for strong attention to detail, quality before quantity and excellent customer service.
A JW Valve Body will help to firm up shifting, while keeping the shifts crisp and not banging into gear. Also performs shorter shift duration, which decreases heat generated and reduces slippage and wear on the friction plates.
While the valve body can be used with stock programming, we suggest DP-Tuner if you are thinking about upgrading. Jody and John work closely together to make sure that you will get the most out of your transmission.
Please note that there is a 3 week window for core returns. If the core isn't recieved back 21 days from customer reciept then your core charge will be forfeited down to 50% and after 30 days you will be charged the core retail cost of $150.
Posted by Unknown on Sep 5th 2016
Riffraff never lets me down another great product!!!
Posted by Unknown on Jun 23rd 2016
I haven't had a chance to tow with it yet. But just normal driving you can feel the difference in the shift. It's not a long shift anymore. It's fast and smooth.
Posted by Richard on May 31st 2016
The transmission shifts much quicker without being harsh, an easy project with Riffraff's instructions. As always, great service from Riffraff.
Posted by Jeff Klee on Oct 16th 2015
It has firmed up the shifts and the transmission seems more responsive.
Posted by Nicmike on Oct 16th 2015
I replaced the stock valve body that came on a new 4R100HD with this JW product. The stock VB was very, very smooth and subtle on the new transmission. After this product was installed, I can feel the really quick shifts. It is not harsh, as others have noted, but each shift is felt. So far, so good.
Posted by Phil R on Oct 14th 2015
The transmission has 44,000 miles on it but I felt the shifting was too slow and possibly prematurely wearing the clutches. This took out all the slop, firm but not jarring. Easy to install, I just had to get an inch pound torque wrench.
Posted by Unknown on Sep 25th 2015
Really smooth shifts still like stock but still shifts quicker than stock valve body
Posted by Unknown on May 22nd 2015
Installation was pretty simple. Seems to have firmed up shifts across the board.
Posted by Jordan ianniello on Mar 15th 2015
Great product does as described #1 customer service!
Posted by Shaun S. on Jun 12th 2014
The JW valve body did exactly what I wanted it to do. It firmed up the shift points and when it does shift, it quick and precise. Even with a custom chip, it shifted a bit soft(stock like)for my style. I'd say its perfect now!