I am looking into having input gears made.
I need to know the material to cut the blanks from.
I did discover they are through hardend when cutting an old one to make a prototype female 10 spline input gear for dual tranny.

any help would be appreciated.

TIA

The gears in my tow truck 465 are made out of steel.:p

thanks for the bump
:flipoff2:

any comments on choosing 8620 ?

my concern, probably unfounded, is using a material for my custom gear that will kill the stock countergear.
creating a custom countergear is easy but drives the cost up.
I will be looking at that for custom ratios in my own truck but need to look at the price point to get my dual tranny idea on the market for the majority.

also,
I have been trying to draw the adapter in imperial measure,
this tranny looks to be all metric so I am thinking it is going to simplify my drawing going metric.
are machinists more versed in metric then the general population :)

A machinist will convert all the metrics to SAE. Calls a gear manuf. like Tera or Brian's for material type and treat procedure. You can also call Novak.

Novak's response
Hi Michael

It could be from any variety of steels. We've never had the input shafts tested for metallurgy. 4140, 4720, 8620 and half a dozen other options exist. You probably won't go wrong with any of them.

Good luck. Sounds ambitious but worthwhile if you reach you goal.


Eric


hadnt thought about Tera

I have been internet searching to try and find how to contact the factory.

problem is, I know nothing about metal.
so need a pointer or 2.
if having the input drive gear a different material wont chew the counter driven then I am in good shape

next project is altering the counter ratio anyhow, so for my truck not a big deal.
I would hate to sell someone a gear that would destroy their tranny

Do you have an expendable gear to test? If so you can have someone test it for you and tell you what material it is as well as it's heat treat.

I'd offer to do it for you but I don't think you'll like the turn around time.

what does that cost?
these parts are a dime a dozen
and I could just send a piece that i am discarding anyway

There's a shops called Brian's offroad or something like that, he regears D300 x-cases by cutting the gears. Very expensive, try a search.
Like Eric says, very ambitious and he's being nice. Not only do you need to know the materials involved but also gears pitch diameters, thrust angles, deflection, lash tolerances, etc. That's alot of info for someone with a lack of metalurgy education. Then you need to know your suppliers machine parameters and if you can line all your ducks up in a row. And if your prints aren't up to snuff your suppliers will be calling you asking why you left out info or doubled a tolerance. Could be lots of headaches in your future but good luck in your endevor.
As per your first post, there are kits available for doubling trannys. I've read a post not long ago where some Cruser guys were doubling SM420s, it may be worth the search.

Originally posted by mj
what does that cost?
these parts are a dime a dozen
and I could just send a piece that i am discarding anyway

Cost? Don't know...you might be able to get some dudes at a university to do it...any university with an engineering program could do it.

Tho the part being examined will be junk because you have to cut it.

I dont think it is too ambitious.
"here is a part, duplicate it" doesnt seem too hard
the factory did the math for the stock gear, all I want is a different snout

I have my welded one sitting in front of me already,
so I will have dual sm465 in 10 spline ready to install in a matter of weeks after I draw the adapter.
then adapter gets ready for CNC copying

I just thought the world would rather a custom gear over a welded used.

spoke to ORD about a very short 32spline 465 mainshaft, and he has them on the shelf.
so a very stout,
very short,
dual sm 465 tranny kit,
with nothing smaller then 32 spline shafts front to back
is easily doable

less then 2" between trannys,
and if you want to $pend, the 205 adapter is fair game on shortening with ORD 32 spline shafts and matching 205 input gear

thanks for all replies guys

I have sent unknown metal examples to company's like:
Lynn Gear
Martin gear
Boston Gear
to have the type of metal determined . They also could produce the gear/shaft combo that is needed.
HTH , Tom