LS430 2001-2006 Rear Upper Control Arm Dimensions and Sizes

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Hi.

Just posting here, to document some data. Hope it gets onto the search engine listings.

With helpful advice for anyone replacing these parts

 

For rear upper control arm (driver POV/looking at the back of the car)

LEFT SIDE 48790-59045 

RIGHT SIDE 48770-59065 

 

Balljoint

Balljoint bolt size: M12

Pitch: 1.25

Nut size: 19MM

 

Front side bolt 90105-12327

Rear side bolt 90105-12326

Bolt

Bolt size: M12

Bolt pitch: 1.25

Bolt strength grade: 11

Bolt length is measured WITHOUT HEAD, WITH FLANGE.

Front side: 85mm

Rear side: 75mm

Bolt must be partially threaded.

Bolt thread length: 25mm (more is OK).

Nut size: 17mm

 

REPLACEMENT SHOPPING LIST:

1* M12 1.25 Pitch grade 10.9 bolt size 80mm

1* M12 1.25 Pitch grade 10.9 bolt size 90mm

3* M12 1.25 Pitch nut

5* M12 washer

Optional:

Copper grease

Threadlocker

 

Suggested replacement advice:

Balljoint bolt is notorious for being damaged/difficult to tighten. Do not attempt to use a die as the balljoin will spin loose. Get a bolt file with a 1.25mm pitch and file bolts if necessary.

If the balljoint nut is warped or damaged, replace it. If you cannot find a exact replacement, use a washer and M12 1.25 pitch nut.

Replace rear and front side bolts with grade 11 or 10.9 bolts.

If you cannot find 85mm and 75mm bolts, get 90 and 80mm bolts and use two good quality washers.

Apply copper grease anti seize to the tubing to prevent problems.

Do not use Nyloc nuts. They will be extremely tedious and time consuming to remove in the future.

Avoid angle grinding or cutting partially threaded bolts to size. This will reduce the minimum thread and compromise the bolt.