I had an IS300 and an IS350 on the lift yesterday and was able to compare the difference in the rear suspension. The systems are indeed different but not entirely. The IS300 has wishbone rear suspension. The IS350 has 5-link which is an improvement. This was accomplished with a 2-piece upper control arm design and the crossmember, upper arms and rear knuckles are shaped differently to accomodate them. But looking at the IS300 I noticed something and busted out the tape measure. The IS300 has rear camber eccentrics to make rear camber adjustable. The IS350 doesn't have this but the lower arms are other wise identical. The eccentrics are located on the lower arms bolts that hold the lower arm to the knuckle. These lower arms, camber bolts and eccentrics could be replaced onto the IS350 and make the rear camber adjustable when the vehicle's 4 wheel alignment is performed. This could be of benefit to someone who wants more negative camber for the road course or lesser negative camber for a lowered car that seems to be eating up the rear tires.

The part numbers are:-
Left rear lower arm # 48740-51010
Right rear lower arm # 48730-51010
Camber bolts (qty 2) # 48190-30040
Camber eccentrics (qty 2) # 48198-30060
Nuts (qty 2) # 90179-14069

-Joe

 

Yeah I would be interested, but I don't want to do only the rear. Somebody just needs to come out with a kit already.

 

great info!

cusco lower arms can be used for the front, also from the is300

 

i guess i'm buying some is300 parts

 

WoW! great info! we should have a thread of what other parts from IS300 could be used onto the ISx50.

 

Wish somebody could try and test fit it and do an alignment.

 

I hate to contradict what you've said, but they can't. Front suspension is designed completely differently on the GSE2x models than the JSE1x models.

 

Only GSE25 AWD 250 comes with front camber adjustments. These adjustments are part of the front crossmember. The front lower control arms and bolts are also different. The front knuckles also have reduced steering inclination angle and significantly reduced caster angle since the vehicle was designed to be used in incremental weather.

I haven't installed the rear camber arms yet. My IS350 has sport suspension and is at the OEM height. The vehicle also has low miles (since its still new) and the only way I would lower the vehicle would be a roll center adjuster spacer on the front and lower profile on the rear. If it came down to springs, I would go with the HKS hypermax coilovers. I don't have a need for adjustable rear camber unless I were to find the camber being completely out of spec. If I run into an IS350 that needs camber adjustment I'll have a word with the guy and make adjustments and let you guys know of what I came up with.

 

Would these Is300 parts fit on my IS250 AWD. I am having rear camber issues. Check out my alignment.....

 

Yeah, your right rear camber is too far into the negative. If I were you I'd purchase the control arm for the right rear and the hardware I've listed above and get it replaced. You may not be able to move the camber too much but you should atleast get the right rear the same as the left rear to have better control of the vehicle and even tire wear. I think that most of your tire wear came from that front toe being too far out of whack. Your front tires were fairly feathered weren't they?

 

That Alignment was from after i got my car lowered.

 

*bump* to see who has tried this? anyone?

 

hrm is300 parts on an x50..megan camber kit in the rear, cusco up front?

 

Your rear camber is adjustable from the factory because you have AWD. If you can't get it adjusted with the factory cams, you'll need to get the Megan pieces.

 

been over a year and no one has tried the IS300 links? anyone got msrp on those parts?

My rear camber is at -2.5 and getting decent wear...toe is perfect so its most inner wear. got 15k miles on these yoko ES100's and still got plenty of meat on the inside.

Probably gonna flip them in a few thousand miles to get about 35k miles out of these tires.