GMC T Series 1994 Repair Manual page 819

BORG-WARNER T5 MANUAL
N O T IC E : W h e n f a s t e n e r s a r e r e m o v e d , a lw a y s r e in s t a ll th e m a t th e s a m e lo c a t io n fr o m w h ic h t h e y w e r e
r e m o v e d . I f a f a s t e n e r n e e d s to b e r e p la c e d , u s e t h e c o r r e c t p a r t n u m b e r f a s t e n e r f o r t h a t a p p lic a t io n . I f
t h e c o r r e c t p a r t n u m b e r f a s t e n e r is n o t a v a ila b le , a f a s t e n e r o f e q u a l s iz e a n d s t r e n g t h ( o r s t r o n g e r ) m a y
b e u s e d . F a s t e n e r s t h a t a r e n o t r e u s e d , a n d t h o s e r e q u ir in g t h r e a d lo c k in g c o m p o u n d w ill b e c a l le d o u t.
T h e c o r r e c t to r q u e v a lu e m u s t b e u s e d w h e n in s t a llin g f a s te n e r s t h a t r e q u ir e it. I f th e a b o v e c o n d it io n s
a r e n o t f o llo w e d , p a r t s o r s y s t e m d a m a g e c o u ld r e s u lt.
SUBJECT
General D escription......................................................................................................................................................7B3- 1
Precautions.................................................................................................................................................................. 7B3- 2
Unit D isassem bly.......................................................................................................................................................... 7B3- 3
Transmission Disassembly..................................................................................................................................... 7B3- 3
Mainshaft Disassem bly............................................................................................................................................ 7B3- 3
Drive Gear Disassem bly..........................................................................................................................................7B3- 8
Cleaning and Inspection..........................................................................................................................................7B3- 8
Transmission C a s e ............................................................................................................................................... 7B3- 8
Bearing Rollers and S p ace rs.............................................................................................................................7B3- 9
Front and Rear B earings.................................................................................................................................... 7B3- 9
Synchronizer Blocker Rings...............................................................................................................................7B3- 9
Synchronizer Keys and Springs............................................................................................................................7B3-10
Extension Housing Oil Seal and Bushing R eplacem ent.............................................................................. 7B3-10
Drive Gear Bearing Retainer Oil S eal..................................................................................................................7B3-11
Transmission Cover...................................................................................................................................................7B3-11
Front Countershaft Bearing.................................................................................................................................... 7B3-12
Unit A ssem b ly................................................................................................................................................................7B3-14
Drive Gear A ssem bly............................................................................................................................................... 7B3-14
Mainshaft A ssem bly................................................................................................................................................. 7B3-14
Transmission Assem bly...........................................................................................................................................7B3-14
S pecificatio n s.................................................................................................................................................................7B3-17
Fastener Tightening Specifications......................................................................................................................7B3-17
Lubrication Specifications...................................................................................................................................... 7B3-17
Special T o o ls ..................................................................................................................................................................7B3-18
The 77-mm 5-speed is a constant mesh transmission,
synchronized in all speeds except reverse.
The main components are:
1. Main drive gear.
• An integral shaft is splined to engage with the
clutch-driven plate.
• The gear drives the countershaft.
• A tapered bearing supports the shaft in the
case.
2. Countershaft.
• The countershaft is one unit for constant rota­
tion with the drive gear.
• Bearings support the countershaft in the case.
SECTION 7B3
TRANSMISSION
CONTENTS
GENERAL DESCRIPTION
•Thrust washers limit the play of the counter­
shaft.
• An extra gear is mounted to the countershaft for
5th speed.
3. Mainshaft.
• The drive gears rotate freely on the mainshaft
and are in constant mesh with the countershaft.
• Key-type synchronizers engage the gears.
•T h e first and second synch ro n ize r hub is
machined in place.
• A tapered bearing supports the mainshaft in the
rear of the case.
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