3.266 diff crown and pinion - fit ISF diff or not?
#106
Lexus Test Driver
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These guys also put 4.xx gears in my Supra...
#107
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I’m literally working on it right now. I don’t have much time on my hands because of pre deployment work ups but I can’t get the axles all the way out. They’re almost there
Last edited by 1sFTW; 05-24-19 at 09:49 AM.
#109
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I’ve got left and right both “popped”. I’ve broken everything loose and tried dropping it just a little to pry the rest and the furthest she has gotten are the splines on the axle. Right now I’m putting the diff back up and putting bolts back to try and pry them all the way out again. I’m playing with different angles and I’m not having much luck.
#111
#112
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#113
Intermediate
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I’ve got left and right both “popped”. I’ve broken everything loose and tried dropping it just a little to pry the rest and the furthest she has gotten are the splines on the axle. Right now I’m putting the diff back up and putting bolts back to try and pry them all the way out again. I’m playing with different angles and I’m not having much luck.
to twist the diff a little to get one side free first, then the other will come out easy... Wish I could be there to help, we could have it out in no time.
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1sFTW (05-24-19)
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1sFTW (05-24-19)
#115
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If I had one more set of hands this thing would have been done. Right now, with only me working on it, my best bet is to start some disassembly of the suspension. I’ve only gotten everything broken loose, I don’t have a control arm puller/ remover to pop the arms out. Hitting it with a hammer and they’re not budging. But yeah, I’ve realized I need to drop it as much as possible. I’m going to resume tomorrow, got some stuff to do tonight!
#116
Tech Info Resource
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If I had one more set of hands this thing would have been done. Right now, with only me working on it, my best bet is to start some disassembly of the suspension. I’ve only gotten everything broken loose, I don’t have a control arm puller/ remover to pop the arms out. Hitting it with a hammer and they’re not budging. But yeah, I’ve realized I need to drop it as much as possible. I’m going to resume tomorrow, got some stuff to do tonight!
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1sFTW (05-25-19)
#117
Lexus Test Driver
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Seems like the general consensus is that the IS350 differential is too aggressive for the ISF. So, I have on order a GS350 rear differential carrier assembly. Through searching on this forum, someone did a direct swap with the IS350 diff on a GS350, so my thoughts are if that is a direct fit, GS350 to ISF in theory is a direct fit. GS350 diff is 3.679 vs the ISF 2.973. If anyone is interested and would like me to start a new thread outlying my thoughts on this once I get it installed, let me know. I'm set to receive the carrier on 5/9/2019 (according to fedex tracking). I should be able to get to the install Friday evening if not this Thursday, I only have one set of hands though
, no one I know is a "car guy/gal" around me. I'll test responsiveness in manual and auto throughout the city and I'll go to some back roads to simulate highway speeds and of course, do some WOT. These are my initial thoughts using rpm/mph calculators on dragtimes.com and analyzing what I will be at in the city... I usually shift around 2400 rpm for city driving until I am at a cruising speed which is 45 in G8 at 1200rpm (usually downshifts me to G7 if I dip under 45) or 60 in G8 at 1600rpm. So at 2400rpm until that, my MPH from G1-G4 is 13.6, 22.95, 33.55, 42.7. If I stay with the same driving style, I will need G1-G5 10.99, 18.54, 27.11, 34.5, 41.03. 45 in G8 at ~1500rpm or 60 in G8 at ~2000rpm. As you can tell, I am bored, sorry for the ramble!
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Do you have any "before" quarter or eighth mile drag timeslips with which to document the actual change this will make to the performance of your car?
#118
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Ive got many passes at the quarter (got damn near every slip) Some with stock, some with exhaust and tune. Some with e32 mix vs 93. All on street tires so yes, i will be able to identify actual performance.
Last edited by 1sFTW; 05-25-19 at 06:36 AM.
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tas02 (05-25-19)
#119
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![](https://cimg1.ibsrv.net/gimg/www.clublexus.com-vbulletin/2000x1504/0ec695d4_c1f5_4e9b_9902_e7c17c89a7cd_cd096b7878dc2fe42bdb792c25b7c7890a72c575.jpeg)
Left 13 gs350, right 08 isf
![](https://cimg3.ibsrv.net/gimg/www.clublexus.com-vbulletin/2000x1504/25ed071f_c99a_45b0_a9d8_8aa4de908498_0f0a5834e0e21ef4bb9b90aa965eee25bb6ef38c.jpeg)
Left isf, right gs350
![](https://cimg4.ibsrv.net/gimg/www.clublexus.com-vbulletin/2000x1504/51942cff_3da1_46fc_a30b_d409ffb81072_17605642561a0ec12565e5119a1d3b9b43aa6e9f.jpeg)
Isf
![](https://cimg7.ibsrv.net/gimg/www.clublexus.com-vbulletin/2000x1504/8ab958f0_9947_403b_8d79_4e170a06fce3_ac9991d9e77265690917220b75ecf6fb990bf0a1.jpeg)
Gs350
![](https://cimg0.ibsrv.net/gimg/www.clublexus.com-vbulletin/2000x1504/eda07078_a7a9_45e7_94dd_e49069ea65a5_68ac1e9af06c346b74ff8eb010b4fb861d8e2676.jpeg)
Isf rear cover
![](https://cimg4.ibsrv.net/gimg/www.clublexus.com-vbulletin/2000x1504/493610b3_2f65_488f_9e45_63c6985f3199_1d47cfb2cf7508bfe0cec424080d5e61dcbf84b3.jpeg)
Left isf, right gs350
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Gs350 rear cover
I am transferring the rear cover of the isf on to the gs350 diff. The left rear mounting is horizontal on the isf and vertical on gs350. Same thread pattern and depth
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lobuxracer (05-25-19)
#120
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That's where I ended up too. The only suggestion is you might be able to do one side at a time instead of both at the same time. Not sure how much height you have to work with though. I believe those who have been able to do this without disassembling the suspension had the car up on a lift with lots of room to drop the diff. If you're on 24" jackstands, I don't think you can get the diff low enough from the chassis, which is why I ended up disassembling a whole bunch of rear suspension bits.
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