Fluid Checking Procedure - Chevrolet 10 Series 1970 Service Manual

CLUTCHES AND TRANSMISSIONS 7-48
Range can be selected at any veh icle speed, and the
transm ission w ill shift to second gear and rem ain
in second until the v eh icle speed or the throttle are
changed to obtain fir s t gear operation in the same
manner as in D Range.
L I . - L I Range can be selected
and the tran sm ission w ill shift to second gear and
rem ain in second until veh icle is reduced to ap-
TR AN SM ISSIO N FLUID
T ran sm ission fluid le v e l should be checked with trans­
m ission warm and s e le c to r le v e r in " P "
( " N " N eutral position on 30 S eries Tru cks), e v e ry tim e
engine o il le v e l is checked or as sp ecified in Section 0
when engine o il is changed.
C A UTIO N: Since the Turbo H yd ra-M atic 400
transm ission is v e r y
s p e c ial precautions should be taken when check-
ing the o il le v e l, to insure against an o v e rfill.
T ran sm ission fluid should be changed as sp ecified in
Section 0.

Fluid Checking Procedure

Transmission a t O perating Tem perature
W ith the tran sm ission hot (after veh icle has been driven
at least 15 m ile s ), the fluid le v e l should be between the
" F U L L " m ark and 1/4 inch below F U L L . The veh icle
should be le v e l with the engine idlin g and the tra n s­
m ission in P A R K .
Transmission at Room Tem perature (8 0 °F )
If the veh icle has not been driven su fficiently to bring
the transm ission up to operating tem perature, the fluid
le v e l should be checked as follow s:
Fig. I T — C o n t r o l L in k a g e ( C A 10-20, C A 3 0 ) M o d e l s
at any veh icle speed,
MAINTENANCE
P a rk position
sen sitive to o il le v e l,
p roxim ately 40
L I Range position prevents the tran sm ission fro m
shifting out of fir s t gear.
It is v e r y important that any communication concerning
the Turbo H ydra-M atic 400 always contain the tran sm is­
sion s e r ia l and veh icle identification number and that a ll
transm ission parts returned to C h evrolet M otor D ivision
always be tagged with the transm ission s e r ia l number.
D ADJUSTMENTS
i
1. Apply the parking brake, put the s e le c to r le v e r in
P A R K , and start the engine. Note: Do Not Race the
Engine. Move the s e le c to r le v e r through each range.
2. Im m ediately check the fluid le v e l with the s e le c to r
le v e r in the P A R K position.
running at a slow idle and the veh icle should be le v e l.
The fluid le v e l on the dipstick should be between the
"A D D " mark and 1/4 inch below.
3. If additional fluid is required, add sufficient fluid to
to b rin g the le v e l to 1/4 inch below the "A D D " m ark
on the dipstick.
If the transm ission fluid le v e l can be c o r re c tly estab­
lished at room tem perature
the transm ission reaches norm al operating tem perature,
the fluid le v e l w ill appear at the " F U L L "
fluid le v e l is set at 1/4 inch below the "A D D " m ark on
the dipstick to allow fo r expansion of the fluid which oc­
curs as the transm ission tem perature r is e s to its norm al
operating point of 180°F. DO N O T O V E R F IL L .
C A UTIO N: Do
loss of fluid through the vent pipe m ight occur
as fluid heats up. If flu id is too low, esp ecia lly
when Cold, com plete loss of d rive may resu lt
which can cause transm ission failu re.
M PH , depending on axle
The engine should be
(80°F) as described, when
mark. The
Not O v e r fill, as foam ing and
CHEVROLET TRUCK SERVICE MANUAL
ratio.