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5 speed filler hole bolt size

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I have an 86 Comanche XLS 4x4 with a 3.4l V6 and 5 speed that I am just finishing prepping for use as my daily driver.

The one fluid I have not been able to check/fill is my 5 speed tranny.


I will need to buy a closed end wrench, due to the restricted access on the side of the transmission. I live out of town a ways, and would like to make sure I get the right wrench the first time.


The filler hole has a bolt/plug that seems to have a head size right around 1 inch. The Haynes book does not specify the size. Does any one know the actual size?


Thanks for any info you can provide.

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It's a Japanese transmission, so it is almost certainly a metric bolt, not SAE.


It's a toss-up. The drain plug on the bottom is 15/16, midplate bolts are metric, bolts that hold the bearing retainer and bellhousing on are standard, shifter bolts are metric...

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