So as the title states, I'm curious to know which transmission u high hp lnf's r running? Reason y I'm asking is because I had Powell's 4.45 on my fully bolted n tuned zfr on 91 octane n it blew 3rd gear after about 8 months or so. I'm currently stuck on deciding what to do. Should I try to see if I can reuse the 4.45 gear set and put that into another used tranny or should I think about going the 6 speed f40 route from ZZP? I really dont want to go that route because its ridiculous how much its going to cost with shipping n labor. I don't see it being worth all the money on a car that depreciates like there's no tomorrow. Anyways, I've heard that there are a few high hp lnf guys running the f23 tranny, true? If so, what was done to it? Any mods or just bolted it right up? How is it doing and what is your set-up/whp? Thanks!

 

I have never heard of a f23 on a LNF; only the LSJ.

Who tuned your car btw?

 

Term2 tuned me. This is my first time hearing about the f23 tranny being used on lnf's as well. If it matters, Term was actually the one who told me about it... If the f23 can really be used and can hold the power reliably then I'd rather go that route.

 

I was running my Stock LNF LSD 3.82 transmission and stock clutch when I was on the ZFR. It started slipping a little bit but held the power.

I was on a 27 psi 91 tune, so I would assume around 400 whp give or take. then i switched to an e30 30 psi ZFR tune. and that was when my clutch started to slip.

 

You're still on stock tranny n clutch? Wow, u must have a nice boost ramp to last that long. Especially on the e blend... Interesting... I also have s1 cams, injectors, n valve springs waiting to go in but at this rate the tranny can't even handle my current set-up on 91 let alone an e-blend with cams... fwd ftl....

 

Yeah term had me on a very nice boost ramp but it still pulled like a freight train. I also dont NLS or go WOT under 3500 RPMs, and dont bang gears.

Car is 100% stock now.

 

Yea, same here. Only difference is I don't have the boost ramp. Lol which can explain the tranny failing.

 

It's your driving. Sorry, but from re-reading your past threads/posts you need a serious driver upgrade.

 

Lol yea, I'll admit I probably need a driver mod but I highly doubt that was the MAIN cause. I always rev match when I down shift, and when coming to a stop I also down shift to help the tranny n brakes while using the engine to help slow the car down. I also don't go out cruising much anymore either so there's not that much wear and tear from pushing it hard. I never go wot under 3.5k rpm, only 4k or above. Then one day I decide to do a little pull after running some errands to enjoy the power again and bam, 3rd gear takes a **** on me. I think I'm just bad luck. Lol

 

Tranny problems cost so much if mine went I'd seriously consider selling or trading in the car. Or put it in a garage and slowly learn how to replace it yourself or with a buddy.

If you go the 6speed route you will have to keep this car for quite some years to make it worth while. Are you prepared to marry this cobalt? lol.

I hear you on re-sell value. Cobalt owners are forced to stay by their decision or take a big hit when selling. My car's worth like 1/3rd of what I paid for it 5 years ago. Thank goodness I haven't had a problem off warranty, and that the problems happened and were covered under warranty.

 

That's weird to hear, because as far as I can remember, the purpose of releasing the 4.45 tranny was to avoid the 3rd gear from blowing.

 

Powell said there is no guarantee what his transmission can hold.

Some guys make **** tons of power on stock transmissions and have no problems, others have built 6 speeds and 4.45 5 speeds and break 3rd gear.

 

400whp SAE, little different up here in CO. I forget what the ratio is

 

The 4.45 changes the load on the gear set, it only helps. Drive mod and tuning a nice ramp for the ZFR is a huge help also

 

That's exactly my point man, I don't want to marry this cobalt. Lol with all the bolt-ons and upgrades I got on this car at this point its worth a good 8 g's or so already but i doubt I can get that back. I was thinking about selling it but I'm waiting until I get through with school first. My plan now is either try to reuse the gearset on a different stock tranny or just put the stock tranny on n have it boost ramped. No more modifying the balt. Can't afford to keep paying for these kind of repairs on a car valued at almost as much as what I put into it in after market parts. Lol its a losing battle. that's y I wanted to know if its true or not about using the f23 trannies to support 400+ whp on our lnf's.

I don't want to try it and have that fail on me too. That will just cost me more money on repairs again so that's y I started this thread to see if anyone on here has tried it yet and what advice they might have.

 

F23 transmissions are a dime a dozen compared to the f35

 

Say what!?! Even the built 6 speeds break? Wtf!!!! I'm definitely not going that route then. Lol with my luck, I'm better off just boost ramping the zfr and calling it a day. Lol I'll keep the car until I finish school, get my job upgrade, then if I want to stay with gm then I'll go for a used 09-11 cts-v. If not then I'm definitely going to consider the Germans. Lol the cts-v and the vette are the only gm cars left that I would even consider owning from gm.

 

yeah dude

Just cause you buy a built transmission it doesn't mean you can beat the **** out of it and it wont break. There is no guarantee with modding these cars. the F35 sucks, even with 4.45 driver mod is the number 1 thing you can do to prevent your transmission blowing up

 

That along with a good tune/boost ramp. I believe they go hand in hand.

 

yes. but you are doubling the amount of torque and horsepower the transmission is "rated for" its bound to happen eventually.

 

You can always go back to stock or near stock. No shame in that.

I dumped like 8k into my last car. Regret it too. That's why im happy to settle with $1000 spent on the SSTC (tune,intake,downpipe,VTABOV).

Ever think of buying a Motorbike to curb your need for speed?

 

I work in EMS and see too many "accidents". I value my life too much to put my life into other careless drivers hands. Lol with a car, ur chances of survival is higher. I guess I'm just a wuss.

 

Good point. Understandable.

 

I think raver has a F23 it is only trans that has held up.

 

Yea... There are just too many careless drivers. Then when they crash because they were too distracted texting, its the other parties fault for not yielding to them. I've heard it all. Lol