Does anybody make straight cut gears for our trannsmissions?

Just blew apart number 3 last night

 

I haven't heard of any company making them for us and we do have a weak link of our POS transmissions but you can get it rebuilt and then Cyro'd. How much stronger is debatable but it will increase the strength.

 

3 gear pulls apart because of the case flexing and pulling apart the gears. Stripped the teeth right off right?

 

Yes sir. 2nd time this exact same thing happened. 2nd to 3rd shift and boom. This time it happened when I rolled into the throttle though

That guy that is doing the compound set up on the lnf... idea stealer lol... He has on his parts list different gears. I'm gonna check that out again

 

I have been reading up alot on cryoing parts, apparently it changes the whole molecular structure of the metal, and its relatively cheap. You can cryo a sleeve and then micro polish it for a smoother surface, in independent tests two motor of the same design that have had this done have shown and increase of trq and hp of 5-8%, thats big imo. I also have seen an lsj motor with a K04 on a flame thowing 30 psi, took the cryo'd motor apart, motor looked better then mine. I will def be looking into case bracing and cryo'ing the case and gear set on my next car

 

you do NOT want straight cut gears. lol. that will get real annoying real quick

 

agreed, generally with straight cut gears you have to shift aggressively, not doing so will actually damage the gear set, plus there is the noise factor esp on cold start.

 

This would not bother me. If it was stronger and would last I could deal. My cars always squeaking from the back or something. And if I can get used to a stage 4 clutch and drive it like a civic i'm pretty sure straight cuts would end up being the same. But yes I have already called a local guy that owns York Cryogenics. It's only 4 bucks per lb. so I'm gonna have my pistons rods sleeves and stuff for the head done there. And if I can the tranny internals as well. But i'm not getting into that I don't know the first thing about ripping apart a manual trans and rebuilding it without screwing something up. Might as well change the final drive to 446 then while it's apart.

 

That's awesome. I love the smart people who figure this stuff out

 

are you sure?

YouTube - Straight Cut Gears

 

rofl he wins...

 

Cryo treating is so awesome! And yes like he said, it basically makes the molecules tighter because of the extreme cold, so the parts can stand up to abuse for much bigger thresholds. Ferrari Cryo treats their Heads, Rods, Pistons and more, that's why their motors are godly when you boost them!

 

Holy **** that is annoying

 

i started to tear and my ears bled mucho

 

Does Cryo treating parts make them smaller at all?

Joel

 

You can't be serious. Sure they will shrink a tiny bit but its probably negligible and they expand when heated again.

 

lets be realistic, you're not going to be winding up a street car like that...

plus odds are that car has absolutely nothing which would act as sound insulation...

this is approximately what straight cut gears will sound like on a street car;
YouTube - Driving the M22
YouTube - M-22 Muncie Transmission Gear Whine.
YouTube - 1971 442 Muncie M22
YouTube - Driving 1971 Pontiac 455 4 Speed Trans Am

I would know becasue I have a car very much like the one in the last video.
(I have a 1970 Firebird that came from the factory with a Muncie 3 speed, but I bought it with a 1972 Firebird M-22 installed.)

You will often hear the transmission over the exhaust (the cutlass video should make that one apparent), but I personally love it...

 

straight cut gears are loud on the street. have you ever had a honda? you know the sound it makes when its in reverse... same exact sound. its not quiet. and you dont even go fast in reverse. (honda uses straight cut gears for reverse).

trust me, that will get very VERY annoying in a street car. and it will be as loud as the vid i posted unless you add extra sound proofing to your car. it will be loud on the outside as well and ppl will be like wtf is wrong with that car?

 

Probably for greatest results for your tranny would be cryo gear set, brace the casing, then cryo the case after, im a firm believer in cryo, if I can find the article I read ill post it, it got into very fine detail about the process. It involves cooling the parts down slowly close to absolute zero, then after they are cooled down raising the temp slowly to several hundred degrees, its sorta like a tempering process

 

oh jesus now everyone is gonna want these freaking things cause it's louder than the supercharger

 

so you're saying our reverse gear isn't straight cut? mine seems pretty loud...
also I don't think cryo-treating a metal part actually increases harness as much as it does create uniformity in the metal structure.

 

I'm a firm believer in it too don't get me wrong. But I would rather cryo a straight cut gear set I guess coming from the guy that's working on his 4th tranny I would do whatever it takes to make it hold. And I don't know how to brace the case properly in order to have that cryo'd or I would. This is probably what you read: First, Deep Cryogenic Treatment is an extended process that very gradually "freezes" or removes heat from the items being treated. Typically, the parts are brought down to 300 degrees below zero (F) in a very slow ramp and then held at that temperature for an extended dwell (24 hours), before being returned to ambient temperature. The last step is a post temper to +300/ +350 degrees F. The entire process takes 48 to 72 hours.

If anybody wants to read the whole article it's here. Pretty interesting actually... http://www.cdpautomachine.com/ecatalog/cryo.html

Anyways.... They don't make straight cuts for our car so why argue anymore

 

I will def be browsing that article when I get home, in order to brace the case properly, you need to know where the case flexes or its weak spots, I know there are some lsj guys on here that know, ask hatrickstu, if hestill posts on here, I know he was either going through the process or researching case bracing on the f35

 

I was just curious and serious. I looked into myself, turns out it does shrink a bit not much.

There is also a process called cryogenic shrink fitting apparently, it was pretty cool. Doesn't shrink much though. On a 1" bushing it will only shrink it .00234" (.06mm).

Thanks for your help.

Joel

 

That would be interesting to know