Thread: All in - pulling the 4.6 engine and trans to fix oil leaks once and for all
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Old 03-24-2014, 08:12 PM
RRPhil RRPhil is offline
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Quote:
Originally Posted by jsoto View Post
Phil -

Sorry for the threadjack. In regards to your other message re: full rebuild kits versus specific parts. What is normal standard operating practice from a trans builder point of view. Teardown and only replace failed parts, and maybe a upgraded part like the upgrade A Clutch Drum.

The gasket and seal kit (ZF 1058 298 022) is clearly essential but, other than that and a re-manufactured torque converter & sump filter, I don’t generally replace anything else unless it’s obviously required.





The only exception to this is the axial needle roller bearing (ZF 1058 202 016) between the B clutch hub and C clutch drum - the Achilles Heel of the 5HP24 - which I invariably replace regardless of condition/mileage.



The control system is so protective of the clutch packs (i.e. drops into TRANS FAILSAFE PROG at the merest sniff of unscripted clutch slip) that it’s extremely unlikely that the clutch plates will have worn at all, unless someone has driven the vehicle around in failsafe mode. For example I generally measure the friction plate thickness of brand new plates at 1.60mm and after 120,000 miles the plates generally measure 1.60mm.

The A clutch drum issue is only relevant to transmissions built before November 2000 (serial number 355863) when the stiffened drum with the radial swages and the main pressure valve land width increase (from 9mm to 10mm) were introduced.





Phil
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