Don Dunbar wrote:

Hi Paul,
I have looking to make a PSRU and was wondering if you had built a unit to your design.
I will use the six pinion C6 and using the 2.19 ratio.
As I have all the equipment and materials at my disposal I am thinking I have nothing to lose.
I have obtained a C6 with six pinions that is in first class order to use to make this unit. What is the price of a new set in the US.
The 6" tube and all sizes of aluminium plate we have as offcuts in the shipyard.
I will look at fabricating this unit including the bell housing and starter motor.
Is the imput gear from the Ford transmission or is this a manufactured unit.
Do you have any advise to give me on this project.
Regards Don

I don't know what a new set would cost. Tracy is charging a bunch for the
upgrade to six pinions so I would guess somewhere around $200 US.
Used four pinion parts in excellent shape are well under $50 US.

The ring gear bulkhead appears to be powdered metal. So drilling it and
machining it may be problematic. I would copy this part over in 4130
or 4340.

The housing shown is machined out of thick wall 6061 T6 but since I designed
that  someone came up with the idea of using shorter pieces of telescopic 
aluminum tubing. Wall thickness of that dimension is some times hard
to find. Of course if you have a really big lathe it is not a problem hogging
it out of solid billet. 

The input gear is modified stock.

The helical gear thrust bearing shown is a bit more complicated than
the idea Jerry Bass or Tracy  came up with.

What city are you near? When you get ready to make
this let me know and I will pop down and help. Be nice to take a bunch
of pictures while it is being made.

BTW It occurs to me once you make one of these it would make a good
boat transmission. Lacking reverse of course. Two planets back
to back and some bands and you could get reverse. I think Jon would
be interested if the price was right.

Paul Lamar
 
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