IsItFast?

This wasn't by choice - I couldn't find a new 08+ trans (other than by GM for $3500+), so I purchased a brand new 07 trans from ebay.

The job took about 7 hours to complete in my garage with the help of a neighbor (we work well together).

Some questions I had are answered now:

-The speedometer is still 100% accurate - 60mph is 60mph, verified by GPS.
-There is no check engine light, cruise control still works just fine
-It is exactly physically identical to the 08+ transmission, the only difference is the final gear ratio.
-Removing and reinstalling this transmission really wasn't as hard as I was expecting, next time I do one I suspect (with the help of my friend) I could get this done in 6 hours.

I don't know if the 4.05 final gear ratio is noticeable - the car was parked for almost 6 months while I saved enough for the new transmission, so I cant give an accurate comparison to the old transmission with its 3.8x ratio. I suspect its marginally faster in acceleration.

I don't notice the RPMs being too much higher on the highway, still sitting around 3k at 70mph.

Still to see if there is a gas mileage difference, or if the dyno reflects the gear ratio change.

3rd transmission in this car going to be the charm? I'm going to disassemble the old trans and take some pictures of 3rd gear. The shaft flexed enough to punch a 1" by 1" hole in the transmission casing (ouch).

Dart_SI

iTrader: (1)

we really need a solution for our transmissions. i thought i was done worrying about transmission issues when i sold my civic si. lol

INFE

iTrader: (1)

Should of bought a trans with a 4.45 final gear. Helps keep the teeth on the gears lol

Kyle4236

anybody cryo freeze em?

IsItFast?

Well to be fair it was mostly my fault (I also think there was a defect in this rebuilt transmission that was installed by GM). I was on the way to see my dad who had just had a massive heart attack, and I wasnt sure if he was going to live (hes fine now) - so I wasnt being careful with my shifts and banged into third gear after hitting the 7000rpm rev limit in 2nd. Boom! On the other hand, that transmission had been in my car less than 1000 miles, the first transmission lasted 40k miles with the exact same mods before an output shaft bearing started to make noise.

If I blow this trans I am seriously going to look into it.

tommyk

I heard people talk about that, does anyone have any proof it works?!

094doorSS/TC

thats too funny man, i was thinking the same thing, i used up 4 cable trannys over the 8 years i had my crx swap, but i did beat the S**t out of them.

INFE

iTrader: (1)

That's not solving the main problem......

Dart_SI

iTrader: (1)

someone is cyro freezing them right now actually, he sent the parts out a week or two ago i think. i forget who. stamina i think, but dont quote me.

Gunney_07

iTrader: (3)

we need case braces.... we need a vendor to chime in on this idea and make something, they would sell a **** ton.

WSFrazier

Going to a 4.45 is a bandaid fix, but I admit it does help longevity a bit. On a stock LNF small turbo, the 4.45 shouldn't hurt much, if at all.

But if you upgrade to something large, I would look into a different route to help the trans last longer.

INFE

iTrader: (1)

Bingo! Case and shaft flex is the biggest problem.

mongorat427

iTrader: (82)

Mines getting done right now and I have a 4.45 gearset also. Took it out of a Saab parts trans. Link below for Cyro

Contact Controlled Thermal

mongorat427

iTrader: (82)

Thats a new trans I bought on the net. Also picked up a Quaif LSD for $300 rebuilt but needs new roller bearings installed

mongorat427

iTrader: (82)

I am. I sent the case also. It has to be done by itself because it contracts a lot more at minus 350 degrees

mongorat427

iTrader: (82)

All the big time drag racers have been doing it for years. I think it must work if they do it. I know big machine shops use Cyroed tooling.

tommyk

Just curious, how much are you spending to get that done?

gdubs

iTrader: (32)

I cyro freezed my tranny for 500$. casing and all. Seems to be working great so far!

Stamina

I wish, but wasn't me.

07SSYellow

iTrader: (7)

damn this makes me hope i dont ever break mine...i dont beat this **** of out mine but still kinda makes me think...hmmmm like honestly how hard do u have to shift and **** to break a tranny? like dump the clutch alot from digs?

northvibe

iTrader: (1)

um I think proof is 06black with some of the biggest whp is proof. I thought I remembered him saying he cryo'd his trans 2-3 years ago at a CED meet.

tom.g

iTrader: (4)

Two questions for you:

1. Where you able to bolt up the LSD from your 08+ Tranny to work with the new one?
2. You say these transmissions (07) are the same as the 08+ trannies less the final gear ratio, is this really the case. GM would give a car with 60+ more ft/lbs of torque the same exact transmission, thats scarry?

Chevycobaltss3

iTrader: (2)

This tranny in my car is it 4th lol by me two previous owner two lol third gear shot out and made a nice hole in the tranny. I welded a peice of 1/4 in aluminium. On the peice that breaks on the casing hoping to see benifits. Who knows..

SXD45

The F35 trans is only rated for 260tq, it seems like a bad choice for this car with the stock numbers it puts down not to mention the available GMS1 upgrade puts it well above that. Wasn't zzp doing something with the f35 trans?

Chevycobaltss3

iTrader: (2)

yeah zzp did have a tranny out. unsure if they stil tho i havent been on there site looking at the trans in like 3 weeks...