the regal GS has something very similar to a 3.73. But after looking into it more the stock 3.5x isn't too bad. It's similar to a 4.05 . Here's a comparison at 8000rpm with 225/40r18's which may not apply to everyone . Just what I'm revving out to. f35/f40. (1st 42/43) (2nd 81/80) (3rd 121/119) (4th 161/156) (5th 205/193) (6th ---/231) so it's pretty close. I'm sure the 2.7x would be more agressive but not enough to be worth buying and swapping unless they have something closed to a 3.9x or 4.0x ratio.

 

Well I found this interesting. Timken bearings are used inside the f40, well, for the diff at least. I'm not pulling the other bearings even though my OCD is trying to convince me to do so. As you can tell, it doesn't take much to impress me lol.

 

can you post the part numbers off those bearings/races as well?

 

After everything is done and tranny is installed, I will be making a diff swap how-to on turbohhr.com. It will list everything needed. Diff bearings are ACDELCO Part # 12788353

 

Tranny done. The Quaife LSD is now sitting comfortably inside its new home.

 

Thst is a beautiful site

 

I thought so too

 

How hard was it? Please do a very detailed how to!

 

I haven't tested it yet so I don't have conclusive reliability results but I can say that if you are VERY mechanically inclined and do precise work you can do the diff swap. Would I trust a GM tech to do it? NO lol. Some don't pay attention to detail and throw things together to quickly without double checking their work. I have a ton of pulling and pressing tools I use on electric motors and larger shaft bearings that helped me with the bearings and outter races. You will need other specific tools, which I will detail later on. The diff job on this trans is the most I would ever attempt myself, anything further (pulling/moving gears)would get sent to Powell.

 

With that description i would attempt myself.
I have a press and "some" OD sizes of press fittings also very mechanically inclined just not a machine shop at the home garage

 

In that case, LSD f40 will only set you back about $4500 assuming you would do the trans swap/mod as well. I believe I read there is some minor welding needing done during the trans swap...not sure on that though

 

do you have a price break down on that? I'm trying to figure out how much to budget for my swap. I figured 2k for the swap kit , $800 for a trans from LKQ and then $1200 for the LSD. And then recouping $800 selling my 4.05/G85

 

Just a brief overview:
Trans w low miles-1100
LSD-1080
F40 TOB-85
Redline mt90 3qts.-50
ZZP kit-2050 I think, maybe more. There is options needed to be selected when purchasing which isn't set up yet on the site I believe since it's still out of stock
LSD swap parts/supplies-135 with ARP fasteners(45 for arp ring gear bolts-optional)

Prices include shipping

 

800 for an f35? Good luck lol

I just cannot justify the cost of the f40. Is it nice? Sure. But the 4500 I could literally rwd swap my car and have money to spare.

 

I sold my 3.82 for $850 and bought my 4.05 for 800 , that was about 3 months ago . I'd rather rwd swap than get an f40 make a kit alan!

 

I do not want RWD for this car. I want to keep the fwd setup and make it near bulletproof for 500+ power. I don't plan on being nice to it. When it's completed and I'm bored with it, then time to build a rwd dedicated drag car. I also have the HHR so my perspective is slightly different. I also plan on keeping the HHR around for quite a while.

 

Hmm so ~4500 in parts for this? Is that zzp kit including the clutch flywheel etc? You know what that isnt terrible, short of the extra most of us would have to pay for getting the lsd installed

Great info

 

There is an HHR owner that is currently building a very nice and well thought out rwd setup utilizing the stock unibody which requires extensive fabrication to make everything work together while still being reliable.

4500 for a rwd swap?? That is absolutely ludicrous. Head over to the HHR network and learn u something. A good rwd setup using stock chassis will set you back waaaayyyyy more. Unless you are a car builder for a living with unlimited tooling and experience I see this costing as much as 8k+ with an engine and drivetrain that would make the swap worth it in the first place. May as well build a tube chassis, then it's not a cobalt or an HHR anymore, just a shell.

The description in the website doesn't detail if 2k is with or without a pressure plate but it sounds like it is. It also says it includes the dual mass flywheel which is MUST HAVE to eliminate vibration/rattling. I didn't think 4500 was bad either considering the boasted strength and gearing of the gearbox and LSD. Not to mention, this gearbox is about as simple as it gets for the Ecotec application.

 

Boy you got lucky! Lsd 4.05's can be found on car-part for about half that if you're patient!
I am a cnc machinist, fabricator, and certified welder by trade. I know you don't know me, but I would politely request that you refrain from speaking to me like I'm just another stg3 feggit

edit: if you're reffering to the v8 rwd swap, that is not at all what I was talking about. That type of swap would naturally cost a ton. Simply rotating the engine and using a kappa bell to a standard ar5 would be pretty simple to someone with good fab skills. All that's left is the rear axle, of which there are several affordable options.

 

Understand, my apologies. With your skill set and resources, your right, it wouldn't be as difficult. But you have to think about the rigidity in the rear of the unibody. It would not be as simple as flipping the engine and making the rear end fit. That would be a half-ass attempt IMO. The entire rear of the car would have to be re-structured. You will be adding a good amount of weight not to mention the added drivetrain drag of RWD. If it was me, I would scrap the 4-banger and do an LSX swap and with to make the RWD worth it. Again, this is my perspective.

I understand the F40 isn't for everybody, especially the LSD F40. Hell, you could have a badass 4.45 built by Powell for half the cost of a LSD F40.

 

No problem, I understand what you're saying. My skill set has saved me a ton of money in modifying my car. Heck my first mod ever was a single pass that cost me simply time and $10 worth of tubing.

Yes a good bit of weight and time would be spent on the rear, to make it safe and reliable, as well as handle predictable.


And it's partially my fault that I often forget to factor in my abilities and resources when judging how much something costs. I have time and resources at my disposal; the fab required for something like that would cost the average joe a fat stack for sure.

 

That is badass, now I know who to call when I need a specialty part made.

 

Uhhh so arm you never gave a quote for the serious guys who aren't getting rid of their car hahaha

 

Yes, the swap kit from ZZP comes with absolutely everything you need to bolt in the F40 and be able to drive it. No additional parts are needed unless you want and upgraded clutch, and if that's the case I would see if they could substitute out the clutch, flywheel, and pressure plate that comes with it for the Fidanza with the SB stage 4 and let you upgrade to that for a little more. I don't have LSD, but I don't road race the car so it doesn't matter to me. I got the whole kit and trans (bought trans from ZZP because it was simpler and there are no F40's anywhere near me for sale) last black Friday for 13% off at the end of their sale and it was about $3300 for everything shipped, then I sold the LSD 4.05 that came with my other car for $800 and my short shifter for $100.

Is it for everyone? No. Is it for me? Yes. I can say after running it for a year that I am more than satisfied with everything about it.

 

I forgot to mention that the optional custom Fidanza flywheel accepts LNF style pressure plates so you can use what you already have. If you have a LSJ specific pressure plate, that will work too as long as it's centered on the flywheel. I hear that the locating holes are bigger on the LSJ pressure plate. The f40 input shaft spline is different compared to f35 which is why a different clutch disc is required. I'm opting for a new pressure plate/dual mass flywheel setup.