SpeedFactory Modified Shift Change Holder Assembly - B Series
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1st off, what is the SCHA, and what does it do? The SCHA is located inside the transmission housing and is the internal mechanism that actually moves the shift forks into position, engaging each gear as it is selected.
Why do you need this? Because you can't finish a race with a broken gearset or the inability to get it into gear due to a damaged SCHA. Because yours is wearing out and bending, and you want to get to it BEFORE it breaks and you ruin a transmission and gear set, especially if you're running a dog box and big power. This also works great with stock transmissions and will help improve shifting, especially the 2-3 shift. Just push the shifter forward, and it will automatically drop into 3rd gear! It pulls the shifter to the centre position with authority, to help eliminate the dreaded 1-2-1 or 2-3-2 mis-shift!
We've made improvements and fixed the parts that break so that you can make better and more consistent shifts, lower your ET's, and save your transmission! The SF-Modified SCHA is a vital component of a reliable transmission, and replacing it BEFORE it fails will save you money and frustration in the long run.
Many people experience problems with missed shifts and/or damaging expensive dogs and synchro teeth, and having difficulty finding the cause of these issues. Frequently a failed stock SCHA is to blame, and this product was designed to address the serious need for a stronger, improved SCHA in these transmissions.
We've spent many hours locating the cause of these issues when they occur in a properly assembled transmission through careful inspection and testing. The stock SCHA has been identified as the source of these "mystery" issues in most cases. The problem areas of the stock SCHA have been identified and we have modified/replaced these parts accordingly, and tested this modified SCHA in our drag cars with great success, as it has eliminated all issues that we had previously experienced.
There are many modifications made to the SCHA, each addressing a known issue.
The stock shift change arm is the biggest weak link. The stock arms are made of poor quality stamped steel and are often damaged (stress cracked or bent). This piece has been replaced with a heavy-duty CNC machined tool steel arm that will not bend or break like it's stock counterpart. A damaged stock arm often goes unnoticed as the damage can be difficult to spot without disassembling the SCHA and/or checking for proper operation of the internal components through assembly and testing utilizing a windowed transmission case. Many people have damaged part after part and experienced issues shifting without realizing that a damaged shift change arm is to blame. Then, replacing it with another stock unit has resulted in the same problem occurring again, usually within a short period of time.
