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#1
11-21-2021, 04:14 PM
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TH400 pan bolts
I have noticed that I have a few stripped threads on my TH400 trans pan. What thread are they and can I re tap and go up a size in bolts?
Thanks in advance. |
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#2
11-21-2021, 04:19 PM
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I dont remember what size but i had to heli coil a couple of mine.
__________________
72 Luxury Lemans nicely optioned 
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#3
11-21-2021, 04:20 PM
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5/16 18. Helicoil them. You can even do it with the pan in place
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1964 GTO 501, Edelbrock Heads NA, 3460 lbs. 9.76 @ 137mph 1971 Trans Am Lucy Blue, 11.56 @ 115 1966 LeMans. 462, SD prepped Kaufman D ports. 11.90 @ 112 1976 Trans Am twin turbo 462, SD Edelbrock heads 8.50@159 2009 G8 GT |
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#4
11-21-2021, 04:31 PM
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You might get lucy and run a tread chaser in the holes, they dont cut new threads just chase out bad ones.
Otherwise as staded its time to Helicoil them. |
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#5
11-21-2021, 04:48 PM
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Once you get the threads back in shape then use studs and nuts you will never have that issue again plus the pan will relocate a lot easier the next time drop it for a filter & fluid change!
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
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#6
11-22-2021, 01:22 AM
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Yep, heli-coils are a breeze on the pan holes. If you don't want to stud them all ... one in each corner would sure be helpful lining up the pan and gasket.
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#7
11-22-2021, 02:43 AM
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Thanks everyone for your help. I assume I need to buy a kit for the helicoils. presumably I just get a 5/16 - 18 kit? Thanks again.
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#8
11-22-2021, 06:57 AM
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The kits come with everything but the needed drill bit, but the face of the kit will tell you what size drill bit you need, which you might have already at home.
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
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