Bushing: Rear Sun Gear (Upgrade) (700R4/4L60/4L60E)


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Bushing--Rear-sun-gear-sonnax-upgrade (Layout) (700R4) (4L60) (4L60E)Transmission bushings are much like engine bearings.  For example, engine oil pressure is heavily reliant on proper bearing fitment/clearance.  Automatic transmission bushings are very similar(if not the same) to engine bearings.  These bushings help to route lubrication to the planetary gear sets, among other tasks.

The 700R4/4L60/4L60E are known to have a relatively loose fitting bushing and hub, due to poor OEM bushing design.  This results in less lubrication to the rear planetary gear set.  Sonnax, an aftermarket company, has designed a wider bushing.  This wider bushing helps to better distribute the axial loads, and improves oil flow to the gear set.

Note:  This upgraded bushing is included in our Blueprint-in-a-Box kit.

  • Blueprint-in-a-Box:  700R4/4L60.


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