Auto flywheel question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**70STOVEBOLT** · 06-21-2006, 04:02 PM

Is a 250 flywheel for an automatic the same as a V8?

ThatOneBlue67 · 06-21-2006, 05:25 PM

Ok, so I was installing a TH350 behind my 230 Inline 6.

I had to remove the old flywheel and use one from a smallblock Chevy (that had the TH350 behind it).

Now, I dunno if the flywheel from a TH350 fits a TH400. All I can tell you is, if you find a truck (in the wrecking yard for example) that has a 400, that flywheel is bond to work no matter what engine application. I think the bolt pattern is the same for most GM engines. The flywheel off that V8 in the yard fits my Early 60's 230.

mbgmike · 06-21-2006, 08:13 PM

Quote:

Originally Posted by 70STOVEBOLT

Is a 250 flywheel for an automatic the same as a V8?

the flexplates depend on the year ie) 73-84 will fit many 305,350 etc but it depends on the vin number for others a 79-80 vin number with M uses a different flexplate

**70STOVEBOLT** · 06-22-2006, 07:16 AM

Quote:

Originally Posted by mbgmike

the flexplates depend on the year ie) 73-84 will fit many 305,350 etc but it depends on the vin number for others a 79-80 vin number with M uses a different flexplate

Mine's a 1970. I'm going to a TH400 from a Saginaw 3 spd. The trans and flexplate came from a 67 but I don't know what engine it had. I know there are 2 different flexplate tooth counts, 153 & 168. Anybody ever made this particular type of swap before? Any help is appreciated.

Thanks,
Stovebolt

06-21-2006, 04:02 PM	#1
70STOVEBOLT Senior Member Join Date: Jun 2005 Location: Winona Lake, IN Posts: 6,424	Auto flywheel question Is a 250 flywheel for an automatic the same as a V8? __________________ 70 C/10 SWB 402/TH400/3.73 "The Needy Beast" 200,000 Mile Club Disc Brake Club Owner installed options: Front Sway Bar Power Steering Power Brakes Cigar Lighter Courtesy Lights Deluxe Side Markers Wiper Delay Sliding Rear Window Power Windows Power Locks Sniper EFI 2015 Silverado 1500 LS 4.3/6L80/3.23 lowered 2" front & rear

06-21-2006, 05:25 PM	#2
ThatOneBlue67 I survived Dead Man's Curve. Join Date: Apr 2006 Location: The Nine-Five-687 Posts: 389	Re: Auto flywheel question Ok, so I was installing a TH350 behind my 230 Inline 6. I had to remove the old flywheel and use one from a smallblock Chevy (that had the TH350 behind it). Now, I dunno if the flywheel from a TH350 fits a TH400. All I can tell you is, if you find a truck (in the wrecking yard for example) that has a 400, that flywheel is bond to work no matter what engine application. I think the bolt pattern is the same for most GM engines. The flywheel off that V8 in the yard fits my Early 60's 230.



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