"Rosine, Steve" wrote:

I was able to get a C6 rear planetary set from a local transmission shop.
It was used, but still I was surprised at how loosely the parts fit.  Is
this normal or is this set badly worn?  It has a 3-pinion planet carrier
that I will definitely want to replace with the 4-pinion.

I have not been able to find an automotive transmission input shaft that
could be machined for a press-fit on the sun gear.  All automotive shafts
are too small to be used without a sleeve, and I'm trying to avoid the extra
parts and fitting work.   I am going to check out a heavy truck transmission
shop today and see what's available there.

Does anyone know if clutch disk splines are standardized like SAE screw
threads?  I would sure help trying to match shafts and clutch disks.

Steve Rosine

It depends on how loose. Put the ring gear over the planet carrier and
measure the side movement with a dial indicator. Mine moves about
0.030 to 0.040 for an eyeball guess. Next time I take it to the hangar
I will measure it. Planetaries are designed to deflect slightly to equalize the 
loads on all the gears so a little looseness is not a bad thing.
Since the total length of the tooth is not always engaged on the
sun gear check for a wear step along the tooth length.
I can feel no step in mine with my finger nail. 

Yes there is an SAE standard. The Chevy V8 is a ten spline SAE 1-1/8.
Since the ID of the sun gear is about  1.45 you will need a sleeve or an SAE
1-1/2 or 1-5/8 ten or sixteen spline shaft. A big truck engine probably. Probably
easier
and cheaper to use a sleeve pressed and welded on to a 1-1/8 Chev
manual TX input shaft.

Paul Lamar
 
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