differential swap or not

[kkiepvvessau]

i have n/a supra, i'm going to swap the TT motor soon. should i keep supra na differential or swap out the differential. the ratio on the TT automatic 3.769 and manual 3.133 or swap Lexus SC 98 differential with 3.266 . anyone doing it before please help ? what it involve or direct bolt up ?

[SupraMan1784]

from what i remember the tt differential is a lot better than the na differential, and its more durable, you can use the lexus differential if you want to, i believe they are drop ins so its not gonna require a lot of modification if any

[TT Girl]

Hi supraman,

The comment that you made regarding the differential being the same as the Lexus...I'm curisous to know how it is that you found that out? Are the Lexus parts better quality than the ones that are specificaly made for the supra?

I'm an Auto Mechanics studant, I'm curious to know how much of what is out there that is in fact the same stuff packaged up and sold as if it's differant.

In europe the parts for the Scoda are VW parts but half the price (they are also both owned by the same co , VW )

[SKILMATIC]

Originally Posted by TT Girl

Hi supraman,

The comment that you made regarding the differential being the same as the Lexus...I'm curisous to know how it is that you found that out? Are the Lexus parts better quality than the ones that are specificaly made for the supra?

I'm an Auto Mechanics studant, I'm curious to know how much of what is out there that is in fact the same stuff packaged up and sold as if it's differant.

In europe the parts for the Scoda are VW parts but half the price (they are also both owned by the same co , VW )

Well considering Lexus is toyota they are the same motors and parts as toyotas because they are the same motor company. The IS300 has the same motor as the supra which is a 2jz. The trannys are similar with better technology and so are most of the bolt on parts. Now with a diff I couldnt say for sure but I wouldnt be suprised if they were transferable.

On the other hand, get a TRD diff. My friend has a 98TT that he blew the stock diff when he down shifted. The TRD ones are bulletproof.

[SupraMan1784]

Originally Posted by TT Girl

Hi supraman,

The comment that you made regarding the differential being the same as the Lexus...I'm curisous to know how it is that you found that out? Are the Lexus parts better quality than the ones that are specificaly made for the supra?

I'm an Auto Mechanics studant, I'm curious to know how much of what is out there that is in fact the same stuff packaged up and sold as if it's differant.

In europe the parts for the Scoda are VW parts but half the price (they are also both owned by the same co , VW )

skilmatic is right, the motors are hte same, teh trannys are pretty much teh same wit some minor differences, as for the diff, the diff in the lexus...is300 and sc300 are the same as in teh na supra since all three cars are na in stock form, the turbo diff is a little more rugged, and lexus parts are the same as toyota parts since lexus is the high end version of toyota

[SKILMATIC]

since lexus is the high end version of toyota

Yeah its the same basic concept as Nissan and Infinity. The 350z and the g35 use the same motor which is the VQ35.

Now I am trying to get ahold of my buddy who is a tech for toyota and see if he knows anythign on the possible diff swap between the alteeza and the supra.

IMO I think the teething is different because of the fact they use different sized drive shafts which i think have different size teeth by 3/16. However, I am prolly wrong. Thats just what I am assuming.

[kkiepvvessau]

i think the best set up is used the supra auto TT differential. the ratio on the Auto tt LSD, it will launch faster than the manual LSD. my friend tried the GS300 differential, It fix perfectly but lack top end. the 93-98 SC300/400 suspension parts are mostly the same but i'm not sure about the Differential bolts. The IS300 is different set up and the ratio is suck.

[dbluchtefeld]

Originally Posted by TT Girl

Hi supraman,

The comment that you made regarding the differential being the same as the Lexus...I'm curisous to know how it is that you found that out? Are the Lexus parts better quality than the ones that are specificaly made for the supra?

I'm an Auto Mechanics studant, I'm curious to know how much of what is out there that is in fact the same stuff packaged up and sold as if it's differant.

In europe the parts for the Scoda are VW parts but half the price (they are also both owned by the same co , VW )

I've limited experience as far as auto mechanics, but I've worked as an engineer in a few different departments in automotive suppliers, including a supplier that ran lexus, mitsubishi, toyota, and GM all on the same line. The difference? Each and every Lexus part was checked for any imperfections by about three different people, looking for anything that so much as LOOKED imperfect, even if they were sure it wouldn't affect function. The GM parts? the machine spit them out into the box, and they were shipped, with occasional checks being performed throughout the shift. The people making decisions as to whether a part was good or not are aware of which customers are going to scrutinize the parts and which ones are going to blindly accept anything, and decisions are made with this in mind both those people.
Now, this isn't to say you should expect junk in the generic box, or that the parts that aren't this brand or that will come apart, but if they are sold under a different name, there probably is a reason for that. My guess is, a process is not capable of making parts to the specs the designers desired 100% of the time, but the second-rate parts are 'mostly' functional, just might not last as long. So, they sort them for the specs that the designers wanted, and sell the second-rate parts at cost, to reduce the material scrap costs.
Also, in other industries, there are often parts that are aftermarket that come in, are checked, are out of spec, and someone says "oh, that's aftermarket, that's good enough", and send them on.
SOO... Just because the parts are made by the same company, or even the same factory, or even the same assembly line... doesn't guarantee they are the same.
Depending on the designer's perspective on things, many times the second rate parts work perfectly well, but if the designer really knows what they are doing, then the spec will reasonably match the functional limits that you will want, and the second rate parts you're not going to want. Just something to keep in mind!