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Canadian Poncho Homepage -> Canadian Poncho -> 65-70 Full Size Power Train Tech Forum -> Flywheel for my 68 2+2 with a 396
Post Info TOPIC: Flywheel for my 68 2+2 with a 396
LandShark68_2+2


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Flywheel for my 68 2+2 with a 396
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Hi guys,

I recently pulled my starter to rebuild it and was told I needed a new flywheel, as there are sections of teeth that are really worn out.
Explains why every once in awhile the starter doesn't engage properly and the starter makes a horrible scream.
Of course, this always happens at a car show or cruise night.

Anyway, in my search for a new flywheel, I'm getting conflicting information. My old parts book says part # 3991403.
Evidently that is obsolete and I've been quoted part # 340296  and  part # 471598.

Some of these are specific for mid-70s corvettes, but are said to work for other late 60's Chevy's.

Anybody have any experience with this, or know of a specific part # that works ?

 

Regards, Scott (LandShark ...)



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4SPEED427


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Are you after only GM, or are you ok with an aftermarket part number? If so, any auto supply store selling ATP can sell you a Z121 that should be identical.

Just make sure you don't get one that is weighted (as in from a 400 small block, or a 454.)

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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
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LandShark68_2+2


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Hi Carl,

I'm not too stuck on just GNM.

However, when I looked at the ATP site, the cross-reference suggests the heavy-duty Z460.

Any thoughts on that ?

 

Regards, Scott (LandShark ...)



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4SPEED427


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A heavy duty version would be great if a store has it available. They're likely all Chinese made, so the heavier duty it is, the better.

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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
67custom


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LandShark68_2+2 wrote:

Hi guys,

I recently pulled my starter to rebuild it and was told I needed a new flywheel, as there are sections of teeth that are really worn out.
Explains why every once in awhile the starter doesn't engage properly and the starter makes a horrible scream.
Of course, this always happens at a car show or cruise night.

Anyway, in my search for a new flywheel, I'm getting conflicting information. My old parts book says part # 3991403.
Evidently that is obsolete and I've been quoted part # 340296  and  part # 471598.

Some of these are specific for mid-70s corvettes, but are said to work for other late 60's Chevy's.

Anybody have any experience with this, or know of a specific part # that works ?

 

Regards, Scott (LandShark ...)

3991403 is superseded by 340296 which in turn changes up to 471598, Available from GM , $120.00, this is for a 1968 396 TH400 Actually fits all TH400 68-69 plus other years 350 etc.



-- Edited by 67custom on Thursday 18th of August 2016 11:25:48 AM

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seventy2plus2


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Are you looking for a flywheel for a standard shift car, or a flexplate for an automatic shift car?   If a flywheel, I'd suggest going with an aftermarket Hays unit.   If a flexplate, any auto parts store should be able to set you up.

Also, what size is it?  153 tooth (12.85" OD), or 168 tooth (14" OD)?



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4SPEED427


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Good points, I assumed original 168 tooth as all big blocks were. No big blocks were made with the small flywheel/flexplate. Also assumed automatic because I remember seeing interior shots of his car with an A/T.

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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
Nov 18 to Dec 2 Black Friday UP TO 50% OFF Plus Huge Coupons
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LandShark68_2+2


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Hi guys,

 

It is an automatic and it's the 168 tooth, 14 inch.

Had some luck. The garage I'm getting the work done at, found an aftermarket (TRW) heavy-duty unit
and I found a NOS (part # 340296) that will be here next week. Between these 2, I think I'm golden.

 

Thanks for all the feedback. Scott



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