Whats LSD ratio came in what supra?

907mge · 12-29-2012, 03:57 PM

I was wondering what my 90 NA auto should have in it? I would like to put in an lsd but am a little unsure what is in it now for the open diff. Also I have a 3.9 and 4.3 any recommendations on the that?

Sonyps307 · 12-29-2012, 08:50 PM

My 89 na has the 4.3 LSD rear in it.

cre · 12-30-2012, 12:06 AM

All N/A's came with a 4.30:1 open or the optional 4.30:1 LSD.
'87 and '88 Turbo models came with a 3.91:1 LSD.
'89 through '92 Turbo models came with a 3.73:1 LSD.

There was an optional Torsen differential offered only on 1JZ models (JDM only) I can't remember the ratio.

907mge · 12-30-2012, 02:46 PM

Ok, thank you. Would there be any benefit to switching to a 3.9?

cre · 12-30-2012, 10:52 PM

Well, you'll see somewhat better highway cruising mileage but beyond that it depends largely on your driving style. Your city and aggressive driving mileage will most likely take a hit as your acceleration will be worse and you'll have to apply more throttle or you'll have to stand on the throttle longer to reach any given speed. If you're a laid back, 'I'll get there when I get there' sort of driver and you want a mild improvement in mileage then go for it. The mileage improvement isn't huge. The LSD is definitely worth having over the open diff in most cases but you might want to see if you can find a 4.30:1 LSD from another N/A first.

Your speedometer and odometer will be off unless you swap in the speedo drive gear from an auto equipped MKIII. The speedo drive gears from the W58, the R154 and the A340E are not interchangeable.

907mge · 12-31-2012, 02:54 AM

Yeah you confirmed what I was thinking. I do have a nice 4.3 that I think I will use then. Thanks

12-29-2012, 03:57 PM	#1
907mge 20psi boost Join Date: Dec 2009 Location: Harrisburg Posts: 759	Whats LSD ratio came in what supra? I was wondering what my 90 NA auto should have in it? I would like to put in an lsd but am a little unsure what is in it now for the open diff. Also I have a 3.9 and 4.3 any recommendations on the that?

12-30-2012, 12:06 AM	#3
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	All N/A's came with a 4.30:1 open or the optional 4.30:1 LSD. '87 and '88 Turbo models came with a 3.91:1 LSD. '89 through '92 Turbo models came with a 3.73:1 LSD. There was an optional Torsen differential offered only on 1JZ models (JDM only) I can't remember the ratio. __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

12-30-2012, 10:52 PM	#5
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	Well, you'll see somewhat better highway cruising mileage but beyond that it depends largely on your driving style. Your city and aggressive driving mileage will most likely take a hit as your acceleration will be worse and you'll have to apply more throttle or you'll have to stand on the throttle longer to reach any given speed. If you're a laid back, 'I'll get there when I get there' sort of driver and you want a mild improvement in mileage then go for it. The mileage improvement isn't huge. The LSD is definitely worth having over the open diff in most cases but you might want to see if you can find a 4.30:1 LSD from another N/A first. Your speedometer and odometer will be off unless you swap in the speedo drive gear from an auto equipped MKIII. The speedo drive gears from the W58, the R154 and the A340E are not interchangeable. __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Begginer to SUPRA and cars, I GOT A FREE SUPRA, PLEASE HELP!!	89MkiiiSupra	Non-Generation Specific Questions	5	06-01-2010 06:48 AM
Kill Board!	Isphius	Show n Tell	95	01-25-2010 05:05 AM
Questions about MKIV Supra	ukno0003	MKIV Supra	5	11-06-2008 10:53 AM
Dream Offer	Karma_Supra	MKIV Supra	22	10-17-2007 03:04 PM
new here and thinking about getting a Supra	WhisPer	MKIV FAQ	20	03-17-2007 01:35 PM

12-29-2012, 08:50 PM	#2
Sonyps307 Lexus & 550's Join Date: May 2010 Location: Baltimore Posts: 526	My 89 na has the 4.3 LSD rear in it.

12-30-2012, 02:46 PM	#4
907mge 20psi boost Join Date: Dec 2009 Location: Harrisburg Posts: 759	Ok, thank you. Would there be any benefit to switching to a 3.9?

12-31-2012, 02:54 AM	#6
907mge 20psi boost Join Date: Dec 2009 Location: Harrisburg Posts: 759	Yeah you confirmed what I was thinking. I do have a nice 4.3 that I think I will use then. Thanks