Name My Rear End

[Supra0089]

So, I've had a question as to what my rear end differential is in my 89 supra. I've learned with the research I've done that there is a 89 version of my car, and then there were slight changes in the 89.5 to a few things in the car...and I was wondering if the differential might be among those differences.

I have an 89 Supra Turbo MA70 with an a340e automatic transmission. What I also know is that it does NOT have LSD.


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With the research that I've done, I've only found this for options:

G284 = 4.30:1 4-pinion 8.0" pre-89 N/A Diff (no-LSD, USA Only)
G282 = 4.30:1 2-pinion 8.0" 89+ N/A Diff (no-LSD, USA Only)
G285 = 4.30:1 4-pinion 8.0" N/A Diff (with-LSD)
G315 = 3.91:1 4-pinion 8.0" pre-89 Turbo Diff (with-LSD)
G305 = 3.73:1 4-pinion 8.0" 89+ Turbo Diff (with-LSD)

and I found this:

89 saw major changes to the chassis ... the early n/a 89.0s saw the G284 ... the n/a 89.5+ saw the G282 .... The early 89's I have learned are the really rare ones as far as having unique features ... i.e. the steering wheel in the early 89's was only used for 1/2 year (in the 89.5+ models, they went to the airbag wheels)... also the ecu and body plugs although GREY, use the yellow plug wiring scheme for the most part ... last and not least, they changed the cross members and motor mounts mid year (which unless you are a noob you already knew) ...


and this:

there were Some 4.10 Torsens in the JZA70, believe they were group A cars.. and there was a guy on here a few years ago that had bought a parts car that had 3.25 in it, he posted pics of the gears themselves with the #s stamped on them. I believe he had done some research and found that there were only a handful made with that ratio, like 5 cars or something. Lucky bastard, I want some 3.25s. Also, someone makes aftermarket 3.54 for the MK3s, Jawsgear I think, cant remember though.

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Any insights as to what my 89 MK3 Turbo Supra non LSD has for a rear diff?

Thanks

 

[suprarx7nut]

Why do you say non-lsd? I thought all turbo models had LSD.

there is an axle code in your data tag on the drivers door. That will tell you what it originally was.

Can also count rotations...

Sent from my ADR6350 using Tapatalk 2

 

[te72]

Paging Jeff Lange... Dr. Lange, please report to the thread.

I would think you might have something of an oddity if you have a turbo diff without LSD. There is always the possibility that your car is NOT original too. If your speedometer works, you can find play with this and answer your own question for the most part, it's not hard to figure out:

http://akb.norbie.net/Public/Gearing.aspx

A couple things about your post though:
-4.10 Torsen was ONLY in the JZA70 cars (not sure on the Group A cars, I would suspect they had a VERY high final drive, nobody needs a 200mph car in Group A)
-Airbag wheel wasn't introduced until 1991 in the USA

 

[Maple191]

-Airbag wheel wasn't introduced until 1991 in the USA

It was introduced on the 1990 moddle. in the US, 1991 on Canadian moddles

Back to the O.P if your car is a "true" turbo moddle it HAS a LSD, if it doesnt have a LSD its either.
A) not a true turbo moddle.
B) a previous owner blew the diff out and swapped it with anything he could get/afford. Or he swapped it for a faster take off.

 

[hvyman]

Never seen a stock 89 without the 3 spoke wheel before.

All 89+ turbo cars had a 3.73 LSD. Na had 4.30 open all years except sport package which was 4.30 LSD. Pre 89 turbo had 3.91 LSD. Factory 1jz cars had Torsen 4.10 which are pretty weak when putting power to them.


You jack up the rear wheels and turn them. Both should spin the same way if LSD unless badly worn.
Can count the number of turns to see what ratio.
And can look on the door jamb sticker to see what came factory like stated above.

 

[Supra0089]

I will be checking the door when I have access to the car again. Thanks guys.

 

[Dan_Gyoba]

If it was an MA70 turbo, it had LSD.

Mine, being an NA Canadian model had the 4.300:1 LSD. I was unaware that the MA70 was ever sold with a 2 pinion differenital.

 

[Jeff Lange]

I've learned with the research I've done that there is a 89 version of my car, and then there were slight changes in the 89.5 to a few things in the car...and I was wondering if the differential might be among those differences.

There are far fewer differences that happened part way through 89 than people think. Pretty much the only thing that changed was the crossmember/engine mounts. Nothing else.

I have an 89 Supra Turbo MA70 with an a340e automatic transmission. What I also know is that it does NOT have LSD.

If you have a Turbo, you have LSD. All Turbos came with a 4-pinion clutch-pack LSD.

With the research that I've done, I've only found this for options:

G284 = 4.30:1 4-pinion 8.0" pre-89 N/A Diff (no-LSD, USA Only)
G282 = 4.30:1 2-pinion 8.0" 89+ N/A Diff (no-LSD, USA Only)
G285 = 4.30:1 4-pinion 8.0" N/A Diff (with-LSD)
G315 = 3.91:1 4-pinion 8.0" pre-89 Turbo Diff (with-LSD)
G305 = 3.73:1 4-pinion 8.0" 89+ Turbo Diff (with-LSD)

That is all correct for North America. There were no other differential choices offered here.

and I found this:

89 saw major changes to the chassis ... the early n/a 89.0s saw the G284 ... the n/a 89.5+ saw the G282 ....

No, the G284 was only used until 88. All 89 and up USA N/A non-LSD cars had the G282.

The early 89's I have learned are the really rare ones as far as having unique features ...

As I said, the early 89's aren't really rare, and there aren't any unique features on them either. They have the early style engine mounts, nothing else.

i.e. the steering wheel in the early 89's was only used for 1/2 year (in the 89.5+ models, they went to the airbag wheels)

There were 3 types of steering wheel offered in North America, the early 3-spoke non-Airbag wheel (all 86-88 models), the later 3-spoke non-Airbag wheel (all USA 89 models, all 89-91 Canadian models), and the 4-spoke Airbag-equipped steering wheel (all USA 90-92 models, all 92 Canadian models). There was never a split year choice on the steering wheel.

also the ecu and body plugs although GREY, use the yellow plug wiring scheme for the most part

There are differences in most years of the Supra as far as wiring goes, with the exception of pre-89. 86-88 used basically the same wiring all around, 89 used the newer style ECU with the grey connectors, but continued to use the older body connectors, some people seem to think that this changed part way through the 89 model year as well, but it didn't. All 89's have the same style wiring. 1990 is when the rest of the body connectors changed, but they continued to make other changes like the O2 sensor for 1991, and the knock sensor connectors for 1992.

last and not least, they changed the cross members and motor mounts mid year (which unless you are a noob you already knew)

This is the only thing they changed mid year.

there were Some 4.10 Torsens in the JZA70, believe they were group A cars.

The JZA70 had several differential choices including a 4.10 Open diff, and yes the 4.10 T1 Torsen. Group A cars were race cars, not street cars, and they used the 7M-GTE. That makes them MA70's, and I've never heard of one having a Torsen, most (if not all) probably used some form of TRD LSD. If you are referring to the Turbo A street cars in Japan, they used a 3.73 Clutch-type LSD just like other Turbo cars.

and there was a guy on here a few years ago that had bought a parts car that had 3.25 in it, he posted pics of the gears themselves with the #s stamped on them. I believe he had done some research and found that there were only a handful made with that ratio, like 5 cars or something. Lucky bastard, I want some 3.25s.

I seem to recall that as well, but not sure where the "5 cars or something" part came in, they wouldn't have been factory gears unless they were from something like a Group A, which means not really factory, since those were all race-car spec. I don't really consider those to be "factory cars".

Also, someone makes aftermarket 3.54 for the MK3s, Jawsgear I think, cant remember though.

Jawsgear did offer some in that range. Toyota also made 3.58:1 gearsets that fit the A70 G-series rear end. I've recently posted the part numbers for them in another thread.

Any insights as to what my 89 MK3 Turbo Supra non LSD has for a rear diff?

What makes you think it's not an LSD? It's probably just old and worn out. They like to do that.

What's your axle code?

Jeff

 

[Nick M]

And model is "model", not "moddle" in America. I say this because we use the Queen's perfect english.

 

[te72]

I stand corrected, just spoke to the guy I was thinking about with the 1990 Supras, all his came with airbag wheels. My mistake.

 

[Turbo Habanero]

Jeff can you still get the 3.58 gearing from Toyota? Could you also link us to the thread with the part numbers ?

Thanks

-Jordan.

 

[Orion ZyGarian]

Jeff, I thought the early 89s also had the 6M crank and the later ones had the 7M. This would be the easier way to see what engine mounts you had, as you could check the tach (6500 redline instead of 6250).

For those that dont know, the 5M, 6M, and 7M are essentially "the same" engine. 5M was a 2 valve head on a 2.8 block, 6M was the same head on a 3.0 block, 7M had the 4v head and 3.0 block. The 6M cranks came in the pre89 cars, are a bit lighter, and dont have counterweights on cylinders 2 and 5. The 89+ cranks do, and have a "7M" stamp on them. If you're rebuilding, you can choose whichever one you want really (6M likes to rev a little bit more, 7M is smoother). I have only had 6M crank cars, and had no problems with how smooth it ran (glorious master inline 6).

 

[Jeff Lange]

No, the crankshaft changed for 1990. All 89's have the 6M crank.

Jeff

 

[Jeff Lange]

Jeff can you still get the 3.58 gearing from Toyota? Could you also link us to the thread with the part numbers ?

Thanks

-Jordan.

The parts are not available in North America, you'd have to import them from overseas.

Jeff

 

[Turbo Habanero]

The parts are not available in North America, you'd have to import them from overseas.

Jeff

Oh I see shucks thanks jeff.

 

[te72]

Oh I see shucks thanks jeff.

Shouldn't mean you can't get them Jordan, just that shipping might be a bit more expensive. If all else fails, you might find someone that lives in Japan or Europe that you trust to ship the gears to you...

 

[Turbo Habanero]

Shouldn't mean you can't get them Jordan, just that shipping might be a bit more expensive. If all else fails, you might find someone that lives in Japan or Europe that you trust to ship the gears to you...

Hmm. Brad move to Japan for me please ! Lol jk.

 

[Orion ZyGarian]

Funny, I actually know a guy that is.....hmmm...

 

[Jeff Lange]

There are places to get these and people who will bring them in, but gearing from Toyota is expensive anyway. You'd have to really want them to make it worthwhile.

Jeff

 

[te72]

Hmm. Brad move to Japan for me please ! Lol jk.

Heh, would love to, but have a lot here I still love about the US. Buddy of mine who was there with the Marines a few years, and has known me for 25 years said I would do quite well there, it wouldn't be too much of a culture shock for me...

There are places to get these and people who will bring them in, but gearing from Toyota is expensive anyway. You'd have to really want them to make it worthwhile.

Jeff

Would likely just be a better option overall to get something like a KAAZ or Cusco LSD for our cars, assuming you can specify the ratio when you order, wouldn't it? I'd be surprised if a gearing set was less than $900 from Toyota...