400 TH transmission & flex plate install, torque & thread locker? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**71CHEVYSHORTBED402** · 02-05-2019, 07:09 PM

Working on a 1971 402 / 400 TH Transmission. Anyone know the torque settings for:

Flex plate to crank flange (bolts include star washers)

Transmission to engine block

Torque converter to flex plate

Also, where do you recommend using thread locker?

Thank you

**kwmech** · 02-06-2019, 01:20 AM

Flex to crank 65 with a drop or 2 of loctite
convertor to flex 45 drop or 2 of the same
trans to block 30-35, nothing needed, personally I always put in a stud on each side to help guide the trans into place then use a flange nut to tighten it down

**71CHEVYSHORTBED402** · 02-06-2019, 02:24 PM

Quote:

Originally Posted by kwmech

Flex to crank 65 with a drop or 2 of loctite
convertor to flex 45 drop or 2 of the same
trans to block 30-35, nothing needed, personally I always put in a stud on each side to help guide the trans into place then use a flange nut to tighten it down

Awesome. I came across a thread, and what was mentioned adds up to your recommendations........Thank you.

02-05-2019, 07:09 PM	#1
71CHEVYSHORTBED402 Senior Member Join Date: Feb 2009 Location: Northern Nevada Posts: 7,118	400 TH transmission & flex plate install, torque & thread locker? Working on a 1971 402 / 400 TH Transmission. Anyone know the torque settings for: Flex plate to crank flange (bolts include star washers) Transmission to engine block Torque converter to flex plate Also, where do you recommend using thread locker? Thank you __________________ Tony 71 Custom Deluxe, SWB, 2WD, 402, A/C. I developed an assm. guide "kit" for restoring it from ground up. With assys, the guide accts for 1000s of OEM identifications and part numbers, all written in short order. 700+ images include assm, illust., charts, and points of interest. Much of the info. applies to all 67-72 GM trucks, and to a lessor degree all 67-72 GM vehicles. My build thread, and more on the guide https://67-72chevytrucks.com/vboard/...d.php?t=730025

02-06-2019, 01:20 AM	#2
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,389	Re: 400 TH transmission & flex plate install, torque & thread locker? Flex to crank 65 with a drop or 2 of loctite convertor to flex 45 drop or 2 of the same trans to block 30-35, nothing needed, personally I always put in a stud on each side to help guide the trans into place then use a flange nut to tighten it down



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