Need a V8 ? A quick guide to getting more power.
basic 302/5.0 or 351W swap should take 50-70 hours if using the
components listed below. Before starting a conversion, we recommend that
you check local and state vehicle regulations to insure the
modifications are legal. James Duff Inc cannot be held liable for any
vehicle modifications since all conversion components are intended for
off-road use only. See inside back cover of our catalog or website for
When converting your Ranger or Bronco II to
a V8, many of your stock components can be reused. However, it is
easier and cheaper to purchase a complete "take-out" engine from a
wrecking yard that already has the necessary components and brackets. If
you cannot find one of these motors, we have provided a list of
accessories and brackets to assist you with your conversion. You need a
belt system using three belts to gain sufficient radiator clearance.
There are 3 popular options for engine swaps:
302: For '83-85 trucks with the carbureted 2.8, this is the easiest
swap. On later models, it is nearly impossible to pass emissions with
this setup. Refer to the following information for the modifications
necessary for installation.
4.0L V6: On '86 and newer 2.9L V6
equipped vehicles, this is essentially a bolt-in swap. The 4.0 engine
control computer, engine wiring loom, cooling system, and transmission
should all be swapped in. This engine makes 170 hp, and can be upgraded
with a Duff Power Chip, a free flow air filter, and even a supercharger.
V8 (Fuel Injected 302): On '86 and newer 2.9L V6 equipped trucks,
swapping in the 215 hp 5.0L is similar to the 4.0L swap, in that you'll
need to take the engine control computer and engine wiring loom from the
donor vehicle. The modifications necessary for installation are mostly
the same as the carbureted 302. If all emission equipment is retained,
most states will accept it as emissions legal.
It is possible to
swap in a 351W with many of the same components as the 302, but tight
clearances make this much more difficult.
original Bronco II and Ranger transmissions are too weak to withstand
V8 power, and must be swapped for a heavier duty transmission. You have
the option of changing your Manual truck to an automatic, or vice versa
at this point.
In '83-'84, some vehicles came with a C5 automatic. In
these vehicles, a V8 torque converter and bellhousing can be installed
on the C5, though we suggest buying a stronger C4 originally used with a
V8. Then have the C5 main shaft and tailhousing installed in the C4. A
used C4 trans should cost between $75-$200.
are two different belt systems, serpentine and "V" belt. Your pump
should have an intake spout on the driver's side to match our radiator.
The serpentine belt is reverse rotation, so you must keep the belt
system your pump came with.
POWER STEERING PUMP
use your stock power steering pump by using the correct brackets, found
on most Ford passenger cars, 1978-86. You need the correct V8 pulley
for proper belt alignment. Original length hoses can be used on most
conversions. For your convenience we've provided the Ford part numbers
below. 2wd will need to modify a V8 bracket to fit.
Ford P/S Brackets........#E7TZ-3C511-A
Ford P/S Pump.............#E6SZ-3A674-B
Ford P/S Reservoir.......#E1FZ-3A697-A
stock V6 alternator can be kept by using the correct V8 pulley,
alternator bracket and adjuster. If you are replacing a 4 cyl. engine,
you should purchase a V8 alternator to provide the correct amperage.
Ford Alternator Mounting Bracket...#E7TZ-10A313-B Ford Alternator
your vehicle has air conditioning and you wish to keep it, the heater
box on the firewall will need extensively cut, though a body lift helps
reduce this. The stock compressor may be used if you can find V8
mounting brackets. The wiring and hoses may need extended to reach the
new compressor location. The AC condenser must be relocated to the front
side of the radiator to clear the fan. The center vertical bar in the
core support must be cut out to make room.
carbureted V8s you must use an in-line electric fuel pump with a 5-7
psi rating. In most cases, a mechanical fuel pump will interfere with
your steering box. If your vehicle came with electronic fuel injection,
you have an in-tank fuel pump with a 40 psi rating. A regulator must be
used to reduce pressure to 5-7 psi. If a regulator is unavailable, you
need to remove the in-tank fuel pump and install an in-line electric
fuel pump. On fuel injected V8s, you can retain the stock in-tank pump.
If you install a highly modified engine, you may need to upgrade to a
more powerful pump to supply more fuel pressure.
starter motor, flywheel, bellhousing, and torque converter (or clutch)
are a matched set. V8's in F-series came with 168 tooth flywheels which
are larger and harder to fit around the firewall. The 157 tooth flywheel
from passenger cars is smaller and easier to fit. It is important to
check your flywheel and starter for proper engagement before installing
Your firewall and floorpan area is
narrow and may need some slight modifications. We suggest using a 14"
torque converter and bellhousing to make clearance. Otherwise, a 3 lb
sledge hammer can make enough room. The body seam between the floorpan
and the firewall must be bent over. In some instances, additional
clearance may be needed near the bottom corners where the firewall and
the floorpan meet. The heater box will need to be trimmed slightly and
patched to clear the valve cover.
converting to a V8, you can use the stock V6 temperature and pressure
gauge sending units. If your vehicle has a mechanical tachometer, you
will need to have it re-calibrated for the new engine.
SUSPENSION OR BODY LIFTS
swaps do not require the use of a suspension or body lift. However, a
2" body lift can greatly reduce the amount of firewall, heater box and
floor pan modifications. See the Bushing section for body lift
information. Reinforcing the front suspension with a suspension lift or
double shocks is highly recommended.
Dana 35 from 89-97 4.0L Rangers and 91-94 Explorers is the easiest
upgrade. It bolts into the same mounting points as the Dana 28, but does
require some driveshaft modifications. We also offer the components for
swapping in a Dana 44 solid axle from an Early Bronco. Check the Solid
Axle category for these parts.
Rear: For Rangers, the 8.8" rear
axle from '89-97 Rangers is a bolt-in, with some driveshaft changes. For
Bronco II's, the same axle can be used, but the spring perches have to
be relocated. The 9" is also a good choice, just be sure to check it for
the correct width before installing. However, most 9" axles have a
5x5.5 bolt pattern, which will need changed to 5x4.5 to match the front