Swapping 4l80e cases
#2
TECH Resident
iTrader: (4)
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No, you do not need to do that because then you will kill your transmission. The 94 is an early model 4L80E, the 99 is a late model. Their lubrication systems are fairly different, trying to late/early parts in late/early cases will cause lube failure pretty quickly and your trans will be toast.