Banks Power GM Motorhomes: (Gas ’82 - 95 7.4L) PowerPack system (Carbureted, single air pump) - Manual (Page 11)

install new vacuum hose, provided, from con-
nection on heat riser (ePr) valve to metal
vacuum line. keep this hose as far as possible from
exhaust system heat. Plastic cable ties are provided
to attach the hose to crossmembers, etc.
if at all possible, route electrical wiring in
the engine compartment as far away from
exhaust manifold piping as you can, 8” or more is
preferred. Plastic sleeve material over wire bundles
is particularly sensitive to heat.
reinstall inner fender panel and replace
interior engine cover.
to fully utilize tuning the banks PowerPack, the
shift governor in the automatic transmission must
be recalibrated to raise the vehicle’s shift points
in relation to vehicle speed. the shift points are
changed by installing lighter springs in the trans-
mission governor. because there are a variety of
coach body configurations, and therefore different
vehicle weights, some experimentation will most
likely have to be done to obtain the desired shift
points.
three different governor springs are provided in the
banks PowerPack. these springs are all lighter in
tension than the factory springs, and are color coded
orange, yellow, and green, from the lightest to the
heaviest respectively. a good starting point for many
vehicles is an orange-yellow combination.
if the vehicle has been recently driven, allow the
transmission to cool before disassembling the gov-
ernor, as hot transmission fluid can cause serious
burns.
Place a drain pan under the governor cover,
located at the rear of the transmission on the
right hand side. remove the four bolts attaching the
governor cover and remove cover from transmission.
it is normal for some fluid to be lost.
remove the governor assembly by pulling it
out and twisting it slightly counter clockwise.
keep the governor assembly as clean as possible
while working on it. See Figure 14.
using a small screwdriver or needlenose pli-
ers, slightly compress the two springs under
the governor flyweights, and remove them from the
governor assembly. See Figure 15.
Select the desired pair of springs from those
provided in the PowerPack kit. install this
pair of springs in the governor assembly. Make sure
the ends of the springs pop over the raised buttons
in the governor assembly. it does not matter which
springs goes on which side.
reinstall the governor assembly into the
transmission case. use the new gasket sup-
plied when reinstalling the cover. Tighten the cover
bolts to approximately 15 ft.lbs.
replace any transmission fluid lost during dis-
assembly.
reconnect the battery cables. Start engine
and listen for any exhaust leaks. tighten bolts
or clamps to correct leaks as required. when leaks
are corrected, lower vehicle. allow engine to warm
up.
check the transmission fluid level per instruc-
tions in owners manual, and adjust level as
required.
test drive vehicle. on a clear section of high-
way, accelerate at full throttle and note your
shift points. in most applications, your 1–2 shift
should occur at 32–34
mph
. (3900– 4100
rpm
.), and the
2–3 shift at 55–57
mph
. (4000–4100
rpm
.). if your coach
has a tachometer, go by the tachometer reading.
it will probably take several tries to find the right
combination of governor springs to achieve these
shift points. remember, lighter springs will raise the
shift points, while heavier springs will lower them.
keep track of your testing changes.
42.
43.
44.
45.
46.
47.
41.
11 P.n. 96340
39.
40. fiGure 15
36.
37.
38.