BRX/FRS diff the same as IS300? - Page 3 - Lexus IS Forum
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post #31 of 184 (permalink) Old 02-19-2015, 03:10 AM
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post #32 of 184 (permalink) Old 02-19-2015, 04:34 AM Thread Starter
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Do you think swapping the front bushings over would fix the gap or are they cast differently?
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post #33 of 184 (permalink) Old 02-19-2015, 06:19 AM
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Quote:
Originally Posted by Ek9B18 View Post
Do you think swapping the front bushings over would fix the gap or are they cast differently?
That I can't answer yet, as I'm relaying what my mechanic is telling me, being 8,000 miles away from the car. I'll ask & find out...
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post #34 of 184 (permalink) Old 02-19-2015, 12:38 PM
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If all this requires is bolts that aren't as long (or are threaded further down the shaft), that's not terrible at all. how hard are those bushings to swap? It's that, or new hardware; either are pretty simple IMO.

Thanks much for looking into this! This is very cool indeed.
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post #35 of 184 (permalink) Old 02-19-2015, 12:55 PM Thread Starter
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Looking at the top pic, it looks like the BRZ bushings are shorter. I imagine some thick washers would be more than enough for this. It's good to know that shorter bushings are available, I might have to tweak the pinion angle to match my new driveshaft.
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post #36 of 184 (permalink) Old 02-19-2015, 04:14 PM
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Bushy business

I installed the diff today i see the gap that they are talking. I was wondering should I use the frs/brz upper bolt screws or just get a washer to fill the gap? about the only problem i am having now is trying to get the drive shafts back in the stub axels anyone have any suggestions?? I am going to take down the diff again and zip tie the axles up. I will test it as soon as i get the drive shafts in. But yes the brz bushings are definately shorter i will take pics and post them after this post. I too will ride on 18 inch wheels X 8 width to compensate for new gearing. I will keep the forum updated.

Last edited by lexpanic; 02-19-2015 at 06:07 PM. Reason: added information
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post #37 of 184 (permalink) Old 02-19-2015, 04:20 PM Thread Starter
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Probably would have been better to put them in before you installed the diff. I'd get a largish hammer and a block of wood, push the stubs in as far as they'll go. Twist them till it feels like the splines might be meshing a little then smack it with the block of wood and/or hit the wood with a hammer. The stubs should have a little spring on the end of them that needs to be compressed.
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post #38 of 184 (permalink) Old 02-19-2015, 06:09 PM
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yes i took the whole diff down and zip tied them up seems like it is easier to get them in from top down position. Still wonderin should i push new bush or get the brs frz screw mounts or add spacers i see what u mean yeah maybe i didnt push the axle stubs in deep enough and i got the diff out now so i will try!

Last edited by lexpanic; 02-19-2015 at 06:11 PM. Reason: update
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post #39 of 184 (permalink) Old 02-19-2015, 06:16 PM
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Here are the pics...
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post #40 of 184 (permalink) Old 02-20-2015, 11:00 AM
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In reply to are the bushings cast different they appear to be the same so they should be able to be pushed out and in with is300 "taller" bushings
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post #41 of 184 (permalink) Old 02-21-2015, 12:14 PM
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Ok diff in i used 3 5/8 washers to compensate for the front mount bushing difference. They fit perfect in between the mount washers and the screw. No more 1 tire fire!!! hehehe here in New Braunfels Texas area I was able to get a manual brz diff (Y38) for 300$!!! from a junk yard. cheapest best upgrade yet. So far no problems I will keep posted. Any questions let me know since I know Matt is far away thanks for doing this Matt so I could do it too!
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post #42 of 184 (permalink) Old 02-21-2015, 02:52 PM
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lexpanic Some washers are thicker than others. Do you have a total height for the washers? Also did anyone confirm the bushing can be swapped to make it work?
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post #43 of 184 (permalink) Old 02-21-2015, 10:25 PM
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.148 inches is the depth of the washer, I dont see why the bushings cant be pushed in the brz/frs diff i can measure tomorrow morning to be 100% sure
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post #44 of 184 (permalink) Old 03-01-2015, 12:27 PM
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does anyone know if there is a difference in differential between the auto and manual frs/brz?

btw thanks lexpanic and matt for this extremely useful and helpful info!
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post #45 of 184 (permalink) Old 03-01-2015, 04:41 PM
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Can you confirm if the diff covers are interchangeable?

I'd love to pick up that Cusco Diff Cover
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