Mack's Standard Transmission Inc.
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Exchange Units

Bearing Rebuild Kits:
Transmissions
Transfer Cases
Front & Rear Axles


Parts:
Bearings
Seals
Synchronizers
Main Shafts
Input Shafts
Counter Shafts
Gears
Bearing Retainers
Shift Forks
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Tremec T56 Corvette

Bearing (Rebuild) Kit:
  Application Year Notes Kit # w/Synchros
Ford RWD        
  BW T56 6sp
95-on
Alum Case. Cast "13-86"
BK396 BK396WS
GM RWD        
  Borg-Warner T56, 6sp Camaro
93-on
Alum Case, Cast "13-86"
BK396 BK396WS
  Borg-Warner T56, 6sp Corvette
97-on
Alum Case, Cast "13-86" Transaxle. Uses 3-piece style 1-6 Synchro Differential parts not included.
BK396A BK396AWS

Countershaft (Cluster):
REF # Part # Description
     


Input Shaft:
REF # Part # Description
16 1386-585-005 T56 Input, 31T 9-1/4" Chevrolet LT1 1993-97
16 1386-585-010 T56 Input, 31T 10-3/4" Chevrolet LS1 1998-00
16 1386-585-008 T56 Input, 29T Chevrolet Aftermarket Unit


Main Shaft:
REF # Part # Description
2 1386-171-003 T56 Chevrolet Mainshaft, 27 Spl.


Hubs & Sleeves (sliders):
REF # Part # Description
43 1386-590-002 T56 3-4 Synchronizer Assembly
  1386-590-004 T56 Reverse Synchronizer Assembly
46 1386-590-003 T56 5-6 Synchronizer Assembly
41 1386-590-001 T56 1-2 Synchronizer Assembly

Synchros:
REF # Part # Description
  1386-091-007 T56 Reverse Synchro Ring, Bronze
  1386-591-005 T56 5-6 Synchro Ring, Lined 1 pc. Type
  1386-591-005 T56 5-6 Synchro Ring, Lined 1 pc. Type
14a 1386-585-007 T56 1-2 Middle Synchro Ring, All
83 1386-091-001 T56 1-2 Outer Synchro Ring, Unlined
14a 1386-525-007 T56 1-2 Middle Synchro Ring, All
14 1386-591-003 T56 3-4 Synchro Ring, Lined 1 pc. Type
14 1386-591-003 T56 3-4 Synchro Ring, Lined 1 pc. Type


Shift Forks:
REF # Part # Description
  1386-596-013 T56 1-2 Shift Fork, All
  1386-596-014 T56 3-4 Shift Fork
  1386-596-009 T56 Reverse Shift Fork, Cast# 1386-096-903
  1386-596-003 T56 5-6 Shift Fork, Cast# 1386-096-909


Bearings:
REF # Part # Description
  LM12711 T56 Countershaft Extension Bearing Cup
  LM12749 T56 Countershaft Extension Bearing Cone
23 32008 T56 Rear Countershaft Bearing
7 SET5 T56 Front Countershaft Bearing
5 RT5305S T56 Rear Mainshaft Bearing
1 M88010 T56 Input Bearing Cup
1 M88048 T56 Input Bearing Cone
4 LM12711 T56 Input Pocket Bearing Cup
4 LM12749 T56 Input Pocket Bearing Cone
1 25520 T56 Mainshaft Bearing Cup
1 25572 T56 Mainshaft Bearing Cone


Bearing Retainers:
REF # Part # Description
     

Key / Spring / Ball Kit:
REF # Part # Description
     


Gears 1-R:
REF # Part # Description
  1386-088-003 T56 Reverse Mainshaft Gear, 35t
  1386-070-002 T56 Mainshaft 5th/6th Driven Gear
  1386-410-007 T56 Cluster Gear Kit, Aftermarket Unit 38-34-26-19
  1386-410-008 T56 Cluster Gear Kit, Close Ratio 36-33-28-17
  1386-083-006 T56 3rd Gear, 37t "906" on Gear
  1386-083-007 T56 3rd Gear, 37t "907" on Gear
  1386-082-004 T56 2nd Gear, 41t
  1386-082-005 T56 2nd Gear, 43t

Miscelaneous Parts :
REF # Part # Description
  1386-034-006 T56 Front Quill/Tube (Ford Only)
  1300-044-013 T56 Rear Seal
  WT266-62 T56 Extension Housing Bushing
  1386-172-008 T56 Chevrolet Front Adapter Plate, Aftermarket Unit
  1386-672-003 T56 Chevrolet Front Adapter Plate, Aluminum
17 12363 T56 Front Seal