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: 6,266	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 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.



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.