matthewwalsh1994@gma

Hey guys I have an ss/sc and would like to know some different ways I could upgrade my gearbox, 2nd gear just lost the syncros or something so I may have to get it rebuilt unless I can find an upgrade kit or if I can find a better gearbox to bolt up to it from another car my local shop told me the cars have too much power for the gearbox which are barely upgraded from the naturally aspirated cobalt thanks guys

kzak104

iTrader: (1)

either get an f40 swap from zzp or just replace yours with another 4.05 gearset, 4.45 is supposed to be the strongest tho.

not really much for upgrades that have been proven.

riceburner

iTrader: (66)

Powell race shop and Performance autowerks do rebuilds with whichever gearset you like and 4.45 would be the way to go.great for powerband too, but its all pretty Expensive

Slowbalt2000

iTrader: (1)

that shop knows nothing lol


the base cobalt doesnt even use the same tranny. and the base trans actually holds more power.

just get an lsj 4.05 if youre lightly modded or stock

09outlander

So this brings up a good question, besides Powell, who does rebuild the F23/35 for these cars?

Slowbalt2000

iTrader: (1)

Performance autowerks

LTBALTBMX

...what? Power doesn't break trannies, torque does

nathan112i

^cant make power without torque on an engine that doesnt rev to the moon

LTBALTBMX

Yeah but the F25 on the base model is good up to 250 Nm of torque, while the F35 in the SS is good for 350 Nm

Slowbalt2000

iTrader: (1)

Well the base model uses the f23.

Just just because they have factory ratings doesnt mean people havent put triple the power through them.

ItalianJoe1

iTrader: (10)

Plenty of 500whp cars on stock trans, it's all in the driving and setting up the rest of the drivetrain to moderate the abuse the gearbox has to absorb.

It's very rare to see synchro failures on these boxes, only from cases of very hard abusive driving. I've seen gears explode and go through the case more often than synchro issues.

kzak104

iTrader: (1)

i doubt that considering gms1 on the tc makes over 350nm or torque, gm wouldn't warranty a factory upgrade if it would kill the tranny

wtf is an f25, 2.4/2.2 uses the f23 which could possibly hold more power due to shorter gearing,

i have a f23 in my daily and a f35 in my big turbo lnf and the rpm in the f23 is almost 800-1000rpm higher cruising.

f23 may hold more power than the f35 for the same reason 4.45/4.05 gear sets in the s/c hold more power than the 3.82s in the tc tranny, shorter gearing less tress on the tranny.

most trannies break because of driver mod tho... im on stock tranny and even stock clutch and both are holding 27psi on a pte 5558, dont hammer the gas below 3-3500rpm and you shouldnt break to much

LTBALTBMX

An F25 is a typo. I meant F23.

Shorter gearing induces less stress on the tranny because the amount of resisting torque "seen" by the input shaft will be lower. Think about low gear vs high gear on a bike. You will just rev higher to go the same speed, comparatively.

You can see here the naming convention of GM transmissions reflect their torque carrying capacity: http://en.wikipedia.org/wiki/F35_transmission
Final point, transmissions do not fail due to power. They fail due to torque. Tell me, what is the relationship between stress and power?

09outlander

Just clicked on the Wiki link, got a chuckle with the bit about FMSR.

nathan112i

Fmsr
fake
money
scamming
retards