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#1
06-02-2020, 09:59 AM
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Torque converter bolt size
I dropped the pan on the TH400 in my 68 Firebird this past weekend to change the filter and fluid. While under the car I went to check the torque converter bolts using a 9/16" wrench. That was too small so I tried a 5/8". That was too big. I tried a 15mm and it fit perfect. The bolts were tight so I didn't pull any out to look at them. I'm stumped on this one. Any ideas on why they were metric heads? Are the any aftermarket converters that take metric bolts? Thanks
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#2
06-02-2020, 10:22 AM
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Yes, pretty common to have metric bolts in aftermarket torque convertors. Just installed a Hughes last week in a customer's car. Bolts took a 15mm wrench.
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62' Lemans, Nostalgia Super Stock, 541 CI, IA2 block, billet 4.5" crank, Ross, Wide port Edelbrocks, Gustram intake, 2 4150 style BLP carbs, 2.10 Turbo 400, 9" w/4:30 gears, 8.76 @153, 3100lbs |
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#3
06-02-2020, 11:19 AM
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Just an FYI on converter bolts...10mm and 3/8 coarse bolts have the exact same tread pitch. A 3/8 bolt WILL screw into a 10mm hole, but obviously not the opposite. If you use a 3/8 in a 10mm hole and tighten it up, could be a problem...
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1977 Black Trans Am 180 HP Auto, essentially base model T/A. I'm the original owner, purchased May 7, 1977. Shut it off Shut it off Buddy, I just shut your Prius down... 
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#4
06-02-2020, 06:21 PM
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A THM 400 converter has a 2" line under the pad if it uses Metric threads
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