No. This allows fluid to engage the lockup with the switch on the transfer case lever to make for easy shifting while moving. 5th gear gives it less resistance
A normal MT600 series transmission doesn't have that external valve at all.
@Swamp Donkey has a good manual for this transmission. Either you have a very high modulator pressure or there is a set of springs on the spool valve that makes it go to 5th that is adjustable with a little t-pin that needs to be adjusted
Are you feeling the converter lockup?
I've rebuilt a...
You should have zero air going to the transmission. Only air lime should be a vent to the frame rail which goes to the stack.
You need to put a pressure gauge on it so you can see what it is doing in 5th.
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