Any time you change bellhousings for a manual transmission, it is critical that you measure the bellhousing for concentricity to the centerline of the crankshaft. The maximum offset radius is .005", if your transmission is off center by more than this, the input shaft runs cockeyed, putting severe stress on the input shaft bearings. This means hot spots and premature failure. Additionally, the shifts will be harsher and your transmission will be noisy. If your transmission is new, failure to index the bellhousing will void the warranty.
The reason this is necessary is because even though the parts are made for each other, that doesn't mean they are all the exact same. .005" is the width of 5 human hairs, that is a fairly tight window. Just installing the dowel pins poorly can shift the bellhousing well outside of the window. In many cases, this is just to verify that the bellhousing is centered, but if it isn't, then you have to address the problem.
Fixing an offset bell is easy with offset dowel pins. These are readily available for most engines and take a few minutes to install, setup, and lock in place. Jefferson takes you through the entire process of setting up the dial indicator, how to find the "zero point" for your measurements, and finally how to correct the offset with replacement dowel pins.
For this project, we are using a 2015 GM L83 Gen V LT-series engine with a new flywheel and a new ‪@HolleyPerformance‬ QuickTime Bellhousing for a ‪@TREMECPerformance‬ TKX trans.
We are using this ‪@SummitRacing‬ dial indicator-
www.summitracing.com/parts/su...
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