I'm following this a bit and I'm not sure I understand why you can't just replicate a single gear and then have it machined. You could have a shop machine it and then heat and cool it a few times to harden it right? Is the 3rd gear so intricate that it cannot be easily programmed into a CNC and replicated?

 

You couldn't just do it on a CNC mill at your average machine shop if that's what you're asking, no. You'd need someone with gear shaping or hobbing equipment, and there are two parts that have to be joined via electron beam welding which requires very specialized equipment or via splining, which would require a lot more intricate machine work and time.

I tried to do this already once and the place stalled and stalled, and then lost the gear, and it took them a year to find it and get it back to me. I just got the original part that I sent them returned to me.

 

who has pictures of a failed 3rd gear?

 

+1 it is a problem with syncro material and/or shift fork design.

 

Were you trying to reply to a different thread?? What we are talking about here has absolutely nothing to do with synchro material or shift fork design.


EDIT: After thinking about it....you might be replying to my original post in this thread from nearly 2 years ago...No?

 

Todd does...he posted pics of it a while back. In fact he might have posted the pics in this thread. I'll take a quick look.

 

I think he means as the gears are stout, just the syncros and shift forks are the weak link. I can vouch for the shift fork. Iv broken the 5th-6th one twice.

 

But that has nothing to do with power, that has to do with how hard you slam the shifter from gear to gear. That's just needlessly abusive shifting technique in my opinion.

 

Then its weak for not being designed to be able to handle fast shifting. You think im going to granny shift a 700+hp car? Being weak does not only have to do with the gears. I never broke a shiftfork in all the 19k miles of NA driving but shortly after going build motor and twined iv broken 2 shift forks 2k miles apart from each other. I think it has more to do with power, then you think.

I still think its a good trans BTW.

 

It has nothing to do with power. The shift forks don't carry any load from the shafts, all they do is move the gears up and down on the hub. My trans has nearly 45K miles on it, 20K of those boosted and I've never busted a shift fork. I shift quickly very often. No granny shifting here. My car gets driven hard every time I have it out.

Shifting quickly and slamming gears are two different things. You can shift quickly without putting too much stress on the forks if you do it correctly.

 

What if the syncros are having more resistance for whatever reason. I remember awhile ago shariff was saying how he was having problems with his trans going into gear when trying to shift at 8k. Maybe just some bad apples.

 

I have been building race car transmissions for years now. Shift forks breaking have absolutely nothing to do with horsepower or torque. Their breakage has to do with either operator error (you could easily break or bend one by missing a shift), operator abuse (shifting way too hard. It doesn't require a bruce lee style punch to move the shifter from gear to gear quicky) or luck. Not the power your car makes. That's a physical impossibility - they don't do anything other than just sit there and slide the couplers back and forth about half an inch on the hub. They handle no engine torque.

 

the other australian company right? i have to mail them again....

 

I know how it works, I took the trans apart. My turbo kit didnt make my right arm stronger tho. Just saying something could be going on that shouldnt be.

 

still looking for pics of a failed third gear.

im dropping my tranny off at a builder in a month or so and trying to get him as much info as possible... he might have a place that can do a gear but he needs to see what is happening

 

I have a place near me that I worked at in college and I still keep in touch with the owner. Its a full-on machine shop, no backyard stuff. I will ask him if he has the right equipment to make gears. He does alot of repair work for one off parts in the manufacturing industry, so he is used to replicating parts w/o blueprints. Usually he just has the broken piece to work off of as a template.

 

I'll have pic for you by mid january at the latest. Neal will be taking my trans apart then or around then.

 

cliff notes from the last 3 pages plz

 

We granny shifted our 1000RWHP car to a 9.35

Tranny is holding up perfectly!! No need at all to slam the shifter from gear to gear!!

 

Exactly...

Although I wouldn't bank on the braising on third gear lasting many more passes, even with clean shifts. Mine lasted 3 years of street driving with about 40 1/4 mile passes, but this was only between 400-550rwhp.