What a replacement page covers
The replacement page lists slipping or flaring between gears, no or very slow reverse, and limp mode on ZF 6HP and 8HP cars. See Automatic Transmission Replacement.
Cheaper things first
On a ZF 6-speed, fluid at the electrical connector is the mechatronic sleeve, a cheap part whose labor and fluid make most of the bill. See Transmission Mechatronic Sleeve (ZF 6HP) and the BMW Mechatronic Sleeve Leak. On the 8-speed, harsh shifts and flare are in the fluid service page (ZF 8HP Transmission Fluid Service).
Transmission Mechatronic Sleeve (ZF 6HP)
Transmission Mechatronic Sleeve (ZF 6HP) on a BMW E90/E92/E60/E70 and similar models typically costs $550–$733 at an independent shop, based on 2 real owner-reported prices.
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ZF 8HP Transmission Fluid Service ZF 8HP Transmission Fluid Service on a BMW F30/F32/F10/G20 and similar models typically costs $300–$1,000 at an independent shop or about $183 in parts DIY, based on 11 real owner-reported prices.
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Used or new units
Used units must be synced to the car with EWS, CAS or FEM programming, which the quote should include.
Fluid service context
The BMW "Lifetime" Transmission Fluid: Should You Service It? covers the lifetime fill question.