r154 rear subframe options
#1
r154 rear subframe options
so I have a 1992 lexus sc300 with a r154 out of a mk3 supra. I had the shifter extended to fit from driftmotion.
the engine is currently a factory 2jz n/a with future plans of going na-t. my goal is to be around 550 600hp.
now from my understanding, I want to fit a 3.77 (or 3.769) according to these 2 forums:
http://www.supraforums.com/forum/sho...ferential-Info!
https://www.clublexus.com/forums/per...ough-r154.html
I always wanted to run a mk4 supra subframe with the 3.133 differential, big flange big pumpin big whatever it is. I figured it could handle more power and it would be a little better for highway speeds. but according to the second thread I posted earlier, it would act really weird with the r154. I have seen the mk4 subframe on a sc300 done before. according to the threads, the rear supra subframe is a little sturdier and better overall.
my question is, should I just keep my subframe and install the 3.77, or install a mk4 supra subframe and put a 3.77 in that subframe? also, will the trd lsd differential work on that differential?
from my understanding, the 3.77 differentials come from tt supra automatics. I have tried doing more research but don't know what else to look for.
the engine is currently a factory 2jz n/a with future plans of going na-t. my goal is to be around 550 600hp.
now from my understanding, I want to fit a 3.77 (or 3.769) according to these 2 forums:
http://www.supraforums.com/forum/sho...ferential-Info!
https://www.clublexus.com/forums/per...ough-r154.html
I always wanted to run a mk4 supra subframe with the 3.133 differential, big flange big pumpin big whatever it is. I figured it could handle more power and it would be a little better for highway speeds. but according to the second thread I posted earlier, it would act really weird with the r154. I have seen the mk4 subframe on a sc300 done before. according to the threads, the rear supra subframe is a little sturdier and better overall.
my question is, should I just keep my subframe and install the 3.77, or install a mk4 supra subframe and put a 3.77 in that subframe? also, will the trd lsd differential work on that differential?
from my understanding, the 3.77 differentials come from tt supra automatics. I have tried doing more research but don't know what else to look for.
#2
Pole Position
iTrader: (18)
the r154 with supra auto tt diff with 3.76 gearing is perfect
Also you dont need to swap out the rear subframe....all you need to do is change the pinion flange on the diff.....i.e remove you old one from SC and swap it over to new diff.....it is as simple as dropping old diff and mounting new one up
Also you dont need to swap out the rear subframe....all you need to do is change the pinion flange on the diff.....i.e remove you old one from SC and swap it over to new diff.....it is as simple as dropping old diff and mounting new one up
#3
Lexus Champion
iTrader: (10)
its possible to swap out the rear subframe, but its minimal gains other than cool factor. the rear suspension on a supra is not identical to the SC (its very close) so it may do some small changes here and there but other than the sway bars, big brakes, and diff, all of which you can install in your current subframe, there isn't that much to gain versus the large amount of work it is. that being said several members have done it, and really like it, but most of them installed a v160 at the same time or a similar 6 speed trans, so its a personal preference, but that 3.133 is going to be very long gears without the 6 speed to match it. all the 5 speeds are better suited to the 3.76 unless you just enjoy really long gears or are going for top speed racing.
The 6 speed diff is a little stronger, but the tt auto diff and our stock diff's are not weak at all once fitted with an lsd, in fact they are also very strong, easily strong enough for your goals.
The 6 speed diff is a little stronger, but the tt auto diff and our stock diff's are not weak at all once fitted with an lsd, in fact they are also very strong, easily strong enough for your goals.
#4
alright. cool. yeah the big brakes fit on our rear subframes anyway from the tt supra. all I know is that the lower control arms change to wishbone and are sturdier. the upper control arms either get shorter or longer, I think shorter for strength. and the sway bar changes completely.
I do feel like the drivability would feel a bit better and its worth it, but only if your done with everything else. I want to do it, but cant justify spending the money for so little gains.
thanks a bunch guys.
I do feel like the drivability would feel a bit better and its worth it, but only if your done with everything else. I want to do it, but cant justify spending the money for so little gains.
thanks a bunch guys.
#5
last question, if I want to buy a differential, and it says its from a tt supra automatic or from a aristo, how do I know its a 3.76? I think theres a second size too so I don't want to get the wrong one. cause theres one on ebay but it doesn't say the gear ratio? is there any specific way to tell?
#6
Pole Position
iTrader: (18)
Well first you want to see the inside of the diff to make sure it has LSD......
Also they usually go for around $800-1000...so if it is cheaper its not the one you want....
I have been trying to find a used Supra TT auto diff w/ 3.76 on both CL and Supraforums without any luck btw
Also they usually go for around $800-1000...so if it is cheaper its not the one you want....
I have been trying to find a used Supra TT auto diff w/ 3.76 on both CL and Supraforums without any luck btw
#7
Lexus Champion
iTrader: (10)
don't mess with the aristo ones from oversees unless you see it has an lsd in it they did not all come with the same options, but a mk4 supra tt automatic from the states comes with 3.76 and lsd, always, unless someones changed it which is why you always take the cover off to verify.
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#9
Lexus Champion
iTrader: (10)
I wouldn't normally try and find the 2 pieces seperately without already having one, but I guess you could try and do that if you want the trd one for sure it makes sense.
I am not sure you can find the 3.76 without the lsd, actually I am not sure what even comes in an aristo to be honest. you can probably do a google search though on aristo's specifically.
I am not sure you can find the 3.76 without the lsd, actually I am not sure what even comes in an aristo to be honest. you can probably do a google search though on aristo's specifically.
#10
i feel like i just over complicated everything ali. lol. i'm sorry.
i just want to know if theres a way to tell if i am buying a 3.76 diff without opening it.
and know that if i buy a 3.76 diff, will the trd diff fit if the differential is equipped with lsd or not.
i just want to know if theres a way to tell if i am buying a 3.76 diff without opening it.
and know that if i buy a 3.76 diff, will the trd diff fit if the differential is equipped with lsd or not.
#11
Lexus Test Driver
iTrader: (44)
Join Date: Jan 2007
Location: Maryland /Germantown
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Place a piece of masking tape on the edge of one of the rear tires.
Rotate the tire by hand one complete revolution using the piece of masking tape on the tire as a guide.
Count the number of revolutions the drive shaft turns (using the masking tape attached to it as a guide) to one tire revolution. For instance, if the drive shaft rotates three and a quarter turns to one tire rotation, then your rear axle gear ratio is 3.25:1.
if the driveshaft ratates three and three quarter turns then you have a 3.76.9
#13
Lead Lap
alright. cool. yeah the big brakes fit on our rear subframes anyway from the tt supra. all I know is that the lower control arms change to wishbone and are sturdier. the upper control arms either get shorter or longer, I think shorter for strength. and the sway bar changes completely.
I do feel like the drivability would feel a bit better and its worth it, but only if your done with everything else. I want to do it, but cant justify spending the money for so little gains.
thanks a bunch guys.
I do feel like the drivability would feel a bit better and its worth it, but only if your done with everything else. I want to do it, but cant justify spending the money for so little gains.
thanks a bunch guys.
Best bet for diff is to get one of a Supra Auto TT (3.76 ratio) and get the TRD centre installed.
#15
FYI, 97-98 Supra TT Automatics had open differentials. Not that it matters if you are going to install the TRD though. You are going the same route that I am going to go although instead of the R154 I am going to use the Supra TT Automatic with the 3.76 Auto TT rear end and the TRD diff.
Steve K
Steve K