Sonnax Performance 4L80E 4L85E TH400 Main Shaft 300M Heavy Duty up to 1000HP Featured Products Add 1 double sided OD

Add 1 double sided OD friction for a total of 5 (gas) for a 25% gain

3-piece bonded drum pistons

The cast-aluminum sleeve breaks at the retainer area due to sleeve porosity and the retainer cocking in the bore and exerting excessive force on the thinnest part of the sleeve

Manufacturer Part Number: T16007GP

but don’t stop there

Sonnax Performance 4L80E 4L85E TH400 Main Shaft 300M Heavy Duty up to 1000HP Featured Products Add 1 double sided ODNon Domestic Product: No Custom Bundle: No Fitment Type: Direct Replacement Items Included: Heavy Duty 300M Input Shaft Manufacturer Part Number: 34672 01 Vintage Part: No Modified Item: No Transmission Type: Automatic Brand: Sonnax Type: Input Shaft Manufacturer Warranty: Unspecified Length Surface Finish: New Universal Fitment: Yes Performance Part: Yes Sonnax Performance Main Shaft 300M 34672 01 Fits 1991 On 4L80E & 4L85E Models Main shaft failure