So you’re making enough steam in your stick shift badass to start twistin’ some 26 spline input shaft goodness? Well welcome to the club, now what to do…..
The great brains at G-Force Transmissions have developed a new 29 spline input shaft. Great you say, what will 3 extra splines get me? Well, let’s look at the difference between the 26 spline and the 29 spline:
- 26 spline: 1.125 inch diameter - strong
- 29 spline: 1.25 inch diameter - stronger
As of now, I'm only aware that G-Force produces these. Currently, they manufacture the 29 spline for the LS T-56 Magnum, as it's the most popular. They're planning to introduce the Ford and Challenger/Hellcat options next, as they rank as the second most popular choices.
The cost is $625, and you'll additionally require the bearing, priced at $45, and the race, costing $23. The good news is it uses the same seal for this shaft as the 26 spline. You'll also need a professional to install this in your transmission if you're unable to do it yourself. Keep in mind that these won't work with a stock gearset; you must have the upgraded, and better, G-Force gearset.
Other parts to consider when making this change include your current throw-out bearing program. For my setup, I use a Tilton 6000 series hydraulic release bearing. They manufacture many different varieties for various applications. The ID of this assembly is 1.40”, providing ample room for the 29 spline shaft – fortunate indeed!
Now, there's the matter of clutch discs. The 29 spline shaft is relatively new, so there isn't a vast selection of disc suppliers. I've learned that Boninfante is making these available. I have some on order from Ace Manufacturing as they're my preferred source for 5135 discs, but I'm still waiting for them to arrive.