Roadmaster Estate Wagon V8-350 5.7L (1993)
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Input sun gear spacer (657/667).
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Input sun gear (658/668).
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Input carrier assembly (662/672).
IMPORTANT:
None of the new modified components listed above (used in the new dual sprag assembly) are interchangeable with the prior third roller clutch and input
sprag assembly. Failure to comply may result in assembly concerns and/or severe transaxle damage.
NOTE:
The new dual sprag assembly can only be serviced back to 1989 (units with 10 plate third clutch packs). (All 1989 to current model 4T60/4T60-E
transaxles have 10 plate third clutch packs.) Units built prior to 1989 use an 8 plate third clutch pack and have significant dimensional differences in key
components.
See Buick Bulletin No. 89-7440-2 for additional information on part changes between 1988 and 1989 to current model transaxles.
NOTE:
In some cases, it may be cost effective to consider a Service Replacement Transmission Assembly (SRTA) instead of a transaxle repair.
Along with the new dual sprag assembly, a new designed input carrier (662/672) gear set was also implemented. The following components were
modified in the input carrier (see Figure 3):
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Larger contoured needle bearings.
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Larger pinion shafts.
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Additional carrier lube grooves.
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Top hub and bushing eliminated (660/670).
SERVICE PART INFORMATION:
(The service part information is for units built on February 1, 1993 to current.)
Parts are currently available from GMSPO.
LABOR TIME INFORMATION:
