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#1 |
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Join Date: Mar 2007
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6 tab flexplate?
So I just got my 12" ACC th400 6 tab torque converter, I also received my flexplate from rock auto. The flexplate only mates up with 3 tabs, can I enlarge the other three holes on the flexplate to fit TC?
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#2 |
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Re: 6 tab flexplate?
Does it really need to have all 6 holes bolted up? There shouldn't be any issues opening the other holes up, but I'd recommend making sure that they are smooth so cracks don't have a place to initiate from.
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#3 |
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Re: 6 tab flexplate?
I'd like to have all 6 if possible. Anyone have the part number for a flexplate with 6 correct holes for a 350 engine to th400?
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#4 |
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Re: 6 tab flexplate?
Are you sure it's not a dual bolt pattern? Early flexplates were SAE pattern and later ones are metric.
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#5 |
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Re: 6 tab flexplate?
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#6 |
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Re: 6 tab flexplate?
How much torque does your engine put out? A 454 truck still only uses 3 bolts from the converter to the flex plate. I think you are chasing your tail with using 6 bolts.
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#7 |
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Re: 6 tab flexplate?
250hp 350ftlb, it's really low. So it should be ok leaving three tabs with no bolts? Still need to find some 3/8-16 Bolta for it too.
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#8 |
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Re: 6 tab flexplate?
Three bolts. That's all it needs.
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#9 | |
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Re: 6 tab flexplate?
Quote:
I would be concerned about damaging the flexplate if you redrill or enlarge the other holes.
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#10 |
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Re: 6 tab flexplate?
Sweet, thanks!
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#11 |
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Re: 6 tab flexplate?
BTW, do you use lock washers or lock Tite?
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#12 |
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Re: 6 tab flexplate?
Either works.
BTW, one tone trucks with 350/th400 combinations used 6 bolts on the torque converter.
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#13 |
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Re: 6 tab flexplate?
Good to know the 1 ton thing. Mines 1/2 ton.
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#14 |
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Re: 6 tab flexplate?
Some later trucks used six bolts. I found a Pioneer FRA-145 flex plate on ebay which had six 11.5 holes for a 454. It was an old leftover and they don't list it any more. Now they list a FRA-141 for the 454 which is a dual pattern with 3 @ 11.5 and 3 @ 10 3/4" and the hole are very large in it.
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#15 | |
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Re: 6 tab flexplate?
Quote:
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#16 |
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Re: 6 tab flexplate?
I wouldn't do that. The 454 is balanced externally and SBCs are balanced internally (except the 400). The 454 flexplate has a balance weight on it, and you're going to have a heck of a vibration you just can't get rid of.
Just use the three bolts. It's how it was designed to run.
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I have sworn upon the altar of God, eternal hostility against every form of tyranny over the mind of man. - Thomas Jefferson Last edited by truckster; 01-28-2018 at 09:18 PM. |
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