Re: Thrust Plate Needed

[farna@xxxxxxx]

Unless this is a perfectly balanced engine (rotating assembly was balanced by a machine shop), replacing the ring gear shouldn't affect balance. Factory assemblies aren't perfectly balanced, just balanced to a certain criteria that the factory engineers felt was "good enough" for normal engine use. Nothing to worry about -- "good enough" meant no vibrations during normal operation or signs of abnormal wear. Racers have the engines balanced for high rpm operation, and it's a good idea if you plan on running around 5K or more very often. Most sreet engines rarely see 4-5K -- at least with most drivers. 


On January 17, 2006 Steve Johnston wrote:

> My ring gear on my 1968 390 engine, automatic transmission flex plate (aka flywheel) has 4 consecutive mashed teeth. As a result, every once and a while (invariably at car shows) the starter hits this spot and I get that horrible grating sound. I have a replacement ring gear, but was wondering if it is better to wait and find the correct whole used unit, or have the new ring gear welded on to my current one.  I know that these units are negatively balanced to the crankshaft assembly, and are are not interchangeable with other years, engine sizes, trannies, etc.  If better to replace with a whole used unit, does anyone out there have one for sale?  Thanks.
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