JMA

I was reading a manual Forester's locking rear is 4.11 and fits. How much better does it drive with the suretrac lsd?

I just did mine, swapped it with a Suretrac LSD. Another member here sold me his lgt rear diff so I could swap in the LSD. I have my diff and another suretrac unit, if your interested pm me.

 

So when you swap the suretrac lsd, do you have to install the 4.11 gear on it or is it ready to swap in?

Well, I'll be swapping out the rear diff in my 2010 LGT very soon. Found several fairly large chunks of metal on the plug magnet during the fluid change this weekend. Has anybody done one before?

Probably will get a low mile 15+ WRX diff. Part numbers are the same. New ones are $1800!

Pulled a trailer across town and back.

Picked up the empty case halves yesterday. Bought it for $250 but it's machined and ready to go. Saved me the time it would've taken to disassemble, clean up and take to the machine shop. The guy I got it from is reputable and well known in the Subaru community around here but I'm definitely going to double check all the measurements before I go and buy any parts for it.

Subbed

There are different head gasket thicknesses to account for a different CR, if it is an issue I don't think 3/10s of a point is a big deal.

 

8.5:1 with a slightly thicker head gasket would probably do it. Like .1 or .2 thicker.

Pretty much, yes. Double check the CR for our blocks, or just plan on a new tune for more power!

 

CR for our engines is 8.4:1 but most of the aftermarket pistons out there are 8.2:1 or 8.5:1.

Well then, I'll pick up that ej257 short block. Thanks for the input on this. Haven't done much with Subaru engines except take them out and put them back in. I'll get it disassembled and inspected before taking it to the machine shop for honing. My cost to build should be around 1300-2000 depending on whether I need/want to install new rods or if the crank needs some time in the machine shop.

 

Used ej257 SB: $100

Case & main bolts: $80

Bore & honing: $200

Wiseco pistons set: $500

OEM STI Rods (new bolts) or Eagle: $80-350

King bearings rods & mains: $160

Re-use crank: $0-250

12mm oil pump: $140

Misc cost: $50-200

 

Total:

$1310-$1980

I plan on building a short block for my 5th gen using an ej257 short block. Will re-use the rods and crank (if they are good) and swap out the pistons for a set of forged ones. I'm picking up this short block for really cheap. I've worked out that there are a few differences like the split oil pan and front engine mount location but those parts can be donated from the factory engine. Does anyone know what other differences there are between the short block or are they pretty much the same? Been looking at parts diagrams for the sti and the lgt and I want to get all the compatibility issues figured out before I start building.