The V8 Owners Forum -

OK was removing the transmission in the Hilux to swap the manual Toyota gearbox to a TH350 Chevy automatic and one of the bellhousing bolts sheared off, it was one of the top 2, the others were very tight and I want to run a tap into them to clean out all the crud and corrosion. Does anyone know what the thread size/pitch is? I have tried searching for the answer but cannot find one.

it will be UNC, 3/8 or 7/16

ah OK i do have some 3/8 taps but none seemed to fit, maybe they werent unc though. Thanks for the reply

9/16 ths spanner = 3/8 unc, make sure youre not trying to use an old whitworth tap