Banks Power GM Motorhomes: (Gas ’82 - 95 7.4L) PowerPack system (Carbureted, dual air pump) - Manual (Page 12)

12 P.n. 96341
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 bun-
dles is particularly sensitive to heat.
Reinstall inner fender panel and replace
interior engine cover.
To fully utilize tuning to 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 then the factory springs, and are color
coded orange, yellow, and green, from the light-
est 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
governor, as hot transmission fluid can cause seri-
ous 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 attach-
ing 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 clock-
wise. Keep the governor assembly as clean as
possible while working on it. See Figure 16.
using a small screwdriver or needlenose
pliers, slightly compress the two springs
under the governor flyweights, and remove them
from the governor assembly. See Figure 17 .
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
supplied when reinstalling the cover. Tighten the
cover bolts to approximately 15 ft. lbs.
Replace any transmission fluid lost during
disassembly.
Reconnect 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
instructions in owners manual, and adjust
level as required.
Test drive vehicle. On a clear section of
highway, 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 tachom-
eter 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.
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fiGure 17
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