Quick Question Before I Hit the Garage - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Goffer · 12-23-2004, 05:58 PM

What is the correct size bolt for the inspection cover for a th-400? Four bolts hold it in place. I put some in the other day and I knew they were too small at the time. Of course they fell out and gave me a start one night when I heard this horrible grinding sound, because the cover was rubbing the flexplate.

Gatta love phoenix arizona, it's the 23rd of December and I'm about to put on shorts and a t-shirt to go wrench in the driveway.

purple gas · 12-23-2004, 06:48 PM

Best way to get the right ones is head to the junkyard & fill yer pockets.

CHEVY & GMC FOREVER · 12-23-2004, 08:52 PM

1/4 20

Tx Firefighter · 12-24-2004, 12:13 AM

I've seen them 1/4 inch and I've seen them metric. I don't think there's any set rule of thumb. Some transmissions I have seen even use sheetmetal screws with hex heads.

JimKshortstep4x4 · 12-24-2004, 07:26 AM

I have had good luck using 1/4-20 x 1/2 self tapping screws. The early transmissions appear to be threaded 1/4-20.

Jim

Goffer · 12-24-2004, 03:58 PM

I'll give the 1/4 20 x 1/2 a shot, thanx for the help.

12-23-2004, 05:58 PM	#1
Goffer Registered User Join Date: Apr 2004 Location: Commerce City, CO Posts: 66	Quick Question Before I Hit the Garage What is the correct size bolt for the inspection cover for a th-400? Four bolts hold it in place. I put some in the other day and I knew they were too small at the time. Of course they fell out and gave me a start one night when I heard this horrible grinding sound, because the cover was rubbing the flexplate. Gatta love phoenix arizona, it's the 23rd of December and I'm about to put on shorts and a t-shirt to go wrench in the driveway. __________________ '71 C10 swb 350sb/700r4

12-24-2004, 12:13 AM	#4
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	I've seen them 1/4 inch and I've seen them metric. I don't think there's any set rule of thumb. Some transmissions I have seen even use sheetmetal screws with hex heads. __________________ I'm on the Instagram- @Gearhead_Kevin

12-24-2004, 03:58 PM	#6
Goffer Registered User Join Date: Apr 2004 Location: Commerce City, CO Posts: 66	I'll give the 1/4 20 x 1/2 a shot, thanx for the help. __________________ '71 C10 swb 350sb/700r4

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12-23-2004, 06:48 PM	#2
purple gas Registered User Join Date: Oct 2004 Location: saskatoon, planet earth Posts: 694	Best way to get the right ones is head to the junkyard & fill yer pockets.

12-23-2004, 08:52 PM	#3
CHEVY & GMC FOREVER Registered User Join Date: Nov 2004 Location: New Lenox,IL Posts: 306	1/4 20

12-24-2004, 07:26 AM	#5
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	I have had good luck using 1/4-20 x 1/2 self tapping screws. The early transmissions appear to be threaded 1/4-20. Jim



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