i believe ther LNF tranny is beefier all around... unless the gear ratio is that different to where u arnt straining it as hard.. i know for a fact my LSJ motor had about 60 less HP and like 150 less ftlb torque pullied down and bolt ons lol.. and my LSJ threw 3rd gear 2 weeks after i did full bolt ons on it. I am now running a Tuned with bolt ons LNF motor and tranny with wider tires and havnt torn anything up so far.... knock on wood.. but isnt zzp running a mid 500hp LNF on stock tranny and slicks and still holding up? just my $0.02 on the topic. i dont think my LSJ tranny would have ever handled that kind of beating.

 

mmm yeah zzp is pushing that but what do they have done to the tranny that they have on the LSJ twincharge?? cuz that car is also pushing 450-500whp...

 

that car was on stock tranny. that car isn't twincharged anymore. straight turbo making 610whp on a zzp built trans

 

Their LNF keeps popping the throwout bearings. he popped one at the CED meet

 

they already found out why. too much pressure plate was killing the throw out bearings. centerforce is making a new dual plate clutch with a TOB spacer to not overextend it

 

Why would anyone with a larger turbo want a shorter LSJ gear, or even the 4.45 for that matter? I can see a TVS car.

No wonder 400hp+ Cobalts still run 13s.

 

Are the tranny gears the same? If you're worried about breaking teeth, you should get the gears shot-peened or treated. It's not a huge difference, but it can save you from SOME potential headaches.

 

i just swapped to an GMR LNF 4.45 trans and its the 2nd best thing i have done to this car.......

 

Your doing it wrong. An LNF trans would of been the 1st best thing you've done to your car.

 

We will be working on a full billet gear set in the coming year. Keep your eyes open.

 

ok smarty you go do that and then your trans can look like my old one too 3.82 gear better my ass!!!

 

Like I said, your doing it wrong.

Strengthen the trans and stopping using stock ones. Then use the correct gearing. Pay to play.

 

[QUOTE=D-mac;5214198mAnyone selling a G85 LSJ Trans?[/QUOTE]

make my car disappear and u can have it for free...make sure its totaled though lol

 

If you drove my car your thought process might change. My car is way faster with the 4.45 and the fact that its a GMR trans that is alittle rare

 

Lol, do you guys even know how TQ is transferred and how transmissions work?

Leave it to a Cobalt owner to argue basic car fundamentals that has been proven long ago, and many times.

FYI, ZZP didn't use the 4.45 trans to keep it intact. They used it so they could cross the traps at the top of 4th.

 

And also to keep the strain off of third gear and put more strain on the case. Instead of having that long third gear and being in the middle of the shaft where it can flex you can lessen the time spent there by putting in the 4.45 and disperse the strain to the outside and on the bearings and case. Almost straight from Ryans mouth.

 

I dunno why youRe so against the 445's but come down and take a ride in the car and see. Someone is always there to talk down anything different tried. Thays also why these 400hp cobalt are still running 13s. I know you havent tried it, nor probably been in a swapped one either, this is also an lnf trans in this car too. **** rx7s have a similar gear ratio and we swap em for 430s all the time, its what they come stock with non usdm

 

please allow me to chime in with what I've figured out;

both the Cobalt SS/SC & SS/TC do indeed have the same transmission;

The transmission is actually a Saab sourced design (in my GM training videos it's designated a "sweden transmission" or something to that effect) which GM has pinned the 'F35' designation to.
I have understood that the SS/SC (as well as the HHR/SS) have a 4.05 final drive ratio;
I have understood that the SS/TC has a 3.82 FDR.

The SS/TC transmission would be ALOT harder to source purely based on number of units put into production - when stacked against all hte 4.05FDR applications;

(domestic) 4.05-F35 applications

1. 2005-2007 Chevrolet Cobalt SS/SC
2. 2004-2007 Saturn Ion Redline
3. 2008-2010 Chevrolet HHR SS

(and this doesn't take into account any of the Saab's which came with this gear set.)

(all) 3.82-F35 applications

1. 2008.5-2010 Cobalt SS

I have heard from more than one person that they're totally different transmissions "because xx version will not survive in xx application";
I call crap.
(but often won't do it to someone's face, because it's not worth the argument).

The latest one I heard of was an F35 being replaced by a Getrag F23 - which is imho, a MAJOR fail.

I have understood that when you use a lower (numerically higher) FDR, that you're putting more stress on the transmission gear set - so it would make sense in higher hp application to use a higher gearset...
(please forget that this kinda leaves the HHR-SS as a contradiction to that logic - please also don't ask me why they did it either... I dunno)



back to F23 info (cause I know it needed to be posted, I mean I posted all the F35 info);

F23 application:

1. 2000-2002 J-body w/2.4L
2. 2000-2002 N-body w/2.4L
3. 2002-2005 J-body w/L61
4. 2002-2005 N-body w/L61
5. 2003-2007 Saturn Ion
6. 2006-2007 Cobalt SS/2.4L
7. 2006-2008 G5 GT
8. 2005-2010 Cobalt w/2.2L L61 & LAP
9. 2005-2010 G5 w/2.2l L61 & LAP
10. 2005-2010 HHR

...and I think there's more.
now after seeing that list wouldn't you ask yourself why GM would introduce a new transmission to replace the F23 in higher hp applications?


hint: torque capacity.



I don't think I answered anything, but hopefully I posted something that someone will find useful.

 

so with the new trans, does cruise control still work?

 

yes it does...

 

I also just sent an email to Vince over at Trifecta - he states he can compensate for the different gear ratios as well...

 

Ok I have the lsj f35 in my lnf, it is slightly faster and the shorter gears allow me to stay in my powerband a little better(shortshifting). I'm making 343whp 424ftlbs, I blew the stock LNF tranny in two trips to the track, this one has survived 5 trips so far and going strong. I keep popping lnf throwout bearings too . Even with the shorter gear ratio and not hitting 4th till almost the end Im still trapping between 113-116 depending on the run.

 

Did either of you have any issues installing the transmission? Is it pretty much a bolt-in affair?

 

It is easy enough to fix the speedo and all for the 4.05 FD.

 

Very straight forward