What's up guys. I'm in need of some advice. So I'm currently building my 93 FD with a 2jz. Im wondering if there is a good rear end replacement for the stock diff. Or spend a bunch of money and go 8.8? I know of kaaz and turbo ii but I need something that will hold 700whp. Lmk with any advice. This will be for mainly drag. Thanks

 

Nice thing with the 8.8 is the amount of finally drives available to fine tune vs the rx7 ones.

 

Yes I agree. But I'm just searching around and weird I can't find any company that doesnt build them. I come from a 4g63 world

 

FD Ford 8.8 IRS mounting kit

 

just leave it stock. I never had a problem with my 700 hp 20b and its a racecar with 14 inch rear slicks.

 

Buddy with only 500hp 2jz swap blew his stock diff in a weekend.

 

Oh I'm planning on blowing it haha I'm sure it'll happen. I did here something that if u brace a stock one it'll be 2x as strong. Or maybe just put internals it it?

 

Also that 8.8 kit isn't too bad. Hmm lol

 

Diff braces help:
Banzai Diff Brace (93+ RX-7)

also, the stock torsen isn't super strong, a clutch type will be better, but I still wouldn't trust it for 700 hp

 

He burnt his up from heating it up from drifting with the 2jz

 

Go with the Ronin 8.8 kit and be done.

 

stock case T2 lsd and diff cradle, len bacon is making 700+HP and running low 9 seconds 1/4 mile with it. unless you are heavy into drag racing and launching at 7000k rpms on 2 step i wouldnt worry about it. no reason to spend 6K+ on a 8.8 swap in my opinion..



https://www.rx7club.com/rotary-drag-...trans-1068301/

 

It's not even close to $6k for an 8.8 swap. It can be done easily for well under $2500.

 

Sir you have no idea what you are talking about.

 

I've used a s4 turbo 2 diff for years, have put over 800 though it hundreds launches and times best was 9.34@156, never makes a peep

The 8.8 is good if you "need" it for the gear ratios

 

He has one in his FC....

The kit I linked is $1200... a junkyard explorer diff is $150? maybe $100-200 of welding... and some driveshaft work.

I would argue that it would be less that $2k

 

Yea no idea at all... Here is a picture of the underside of my FC. The Ronin 8.8 mount kit for the FD is the same price....



Explorer 8.8 fully rebuilt with 3.73 gears, and Detroit Truetrac Torsen style diff inside.

 

For an FC yes quite possibly. The FC kit uses 02-05 Explorer diffs that can be found with factory clutch LSD diffs.

The Ronin FD kit uses the 06-10 Explorer diffs. Unfortunately those were not available with LSD diffs because they had some other active traction control BS. Those will require a LSD swapped in, so there is a little more cost associated with the FD 8.8 swap, so figure around $2500 for them.

The factory 8.8 LSD is $219 shipped, and aftermarket diffs go up from there. Upgraded and aftermarket diffs are much more reasonable than diffs for import cars. My TrueTrac diff was $450. It was probably the best mod I've done to the car aside from the engine swap.

 

That ronin kit looks nice! But I agree if I can get away with the T2 and diff brace that would be awesome. I'm on a limited budget for the time being and this build wasn't cheap haha. I'll def keep all these options in mind and also talk to my builder to see what he can do. Also can't forget when u upgrade to the 8.8 I hear I need pricey axles as well

 

No you don't need axles, they are part of the Ronin kit for $1200. All you need is to rob the outer CVs off of your current axles, and supply the Explorer diff and inner CVs.

You will be done for $2000-$2500 depending on the parts you source and what chassis you have.

 

Keep in mind that $2500 is if you pay someone that doesn't like you and go with a REALLY nice LSD.

The Ronin kit is awesome for either the FC or FD. Best option period.

 

Ronnin kit all the way.

 

I cooked my stock diff (with a Kaaz LSD) road racing. It simply got too hot and the gears ate past the case hardening and into the softer gear interior. I currently run the Ronin 8.8 Kit with 4.88 gears and it seems to handle the 460 rwhp and 12" slicks quite well.

Best,
-Trent