![]() ![]() The cost is moderate and you get some nice extra HD components with it. ![]() I'm a big fan of using their kits in the TH400 even though with a little extra work you can easily set one up to double feed direct and get full manual control, plus shorter/firmer shifts, etc. If you use the Transgo 1-2 kit just follow the instructions. You'll also see several "recipes" for doing you own shift improvements, so be careful not to mix-match information as it is well covered on many Forum's and not all exactly the same. Nothing at all wrong with doing a "home brew" shift kit to save some money but you will not get the upgraded parts. They also supply a modified shift valve and plug to block the vent hole in the VB for full manual control. You also get improved direct clutch release springs and a much stronger snap ring for the case to retain the intermediate clutch pack. The Transgo kit (1 & 2) provides the necessary parts to double feed without leaving out any parts. I've never seen a negative from blocking it but it will shorten up the shift and it will feel firmer with no other modifications. Most builders also leave out any "waved" steels in the direct drum as well. On a TH400 you need to be conservative with the separator plate hole size when making that modification. The accumulator is their to "cushion" the 2-3 upshift.
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