GMC T Series 1994 Repair Manual page 773

NEW VENTURE GEAR 3500 (5LM60)
MANUAL TRANSMISSION
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 l l th e m a t th e s a m e lo c a t io n f r 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 th 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 tio n . I f
th 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 lle 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 t h 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 re s u lt.
SUBJECT
General D escription..................................................................................................................................................... 7B1
General Service Inform ation..................................................................................................................................7B1
Disassem bly.................................................................................................................................................................... 7B1
Transmission Disassembly..................................................................................................................................... 7B1
Mainshaft Disassem bly............................................................................................................................................7B1
Synchronizer Disassem bly..................................................................................................................................... 7B1
Reverse Idler Gear Disassem bly.......................................................................................................................... 7B1
Front Housing Disassembly................................................................................................................................... 7B1
Rear Housing Disassembly.................................................................................................................................... 7B1
Cleaning and Inspection.............................................................................................................................................7B1
Mainshaft and Synchronizers................................................................................................................................7B1
Countershaft............................................................................................................................................................... 7B1
Reverse Idler G e a r.............................................................................................................................................. .
Front and Rear Housings....................................................................................................................................... 7B1
Shift Shaft/Rail and Fork assem blies................................................................................................................. 7B1
Shift Lever H ousing................................................................................................................................................. 7B1
A ssem bly..........................................................................................................................................................................7B1
Input Shaft Bearing Retainer Assem bly............................................................................................................. 7B1
Rear Housing A ssem bly..........................................................................................................................................7B1
Front Housing Assem bly........................................................................................................................................ 7B1
Reverse Idler Gear Assem bly................................................................................................................................7B1
Synchronizer A ssem bly............................................................................................................... ........................... 7B1
Mainshaft A ssem bly................................................................................................................................................. 7B1
Transmission Assem bly...........................................................................................................................................7B1
S pecifications.................................................................................................................................................................7B1
Fastener Tightening Specifications......................................................................................................................7B1
Lubrication Specifications...................................................................................................................................... 7B1
Special T o o ls ..................................................................................................................................................................7B1
The New Venture Gear 3500 transm ission is a
5-speed unit that is synchronized in all gears.
The transmission has a two-piece aluminum housing
containing the front input shaft, rear output shaft, main-
He „ars1 ; c° untersha\ 1 reverse idler 9ear' shift ,orks-
Shf
ana shift shaft components
Two different versions of the 3500 transmission are
used and can be identified by the RPO code or the
model of truck from which it was removed. The MGS
transmission is used in the C/K truck line and MY2
version is used in S/T vehicles.
SECTION 7B1
CONTENTS
GENERAL DESCRIPTION
GENERAL SERVICE
ENER
INFORMATION
Lubricant
The lubricant may appear to be very dark in color,
aimost black. This is a normal condition. The silicon
imbedded into the shift forks to reduce wear is react-
,„i(h
i
lng wl,h the lubncant
Cleaning
Thoroughly clean the exterior of the transmission.
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