Because of this variation, the viscous fluid inside gets warm (due to clutch packs “mixing up” the fluid), and becomes less fluid, and more solid. When there is slippage in the rear axle, the rotation of the 2-parts change since the front tires are spinning slower, the inner portion is rotating slower than the outer. Under normal conditions, the inner and outer portions of the coupling are spinning at the same speed. The viscous coupling is a 2-piece part, filled with a viscous fluid and clutch packs. The BW4404 is a chain driven part-time transfer case that offers torque on demand through a viscous coupling. This is not the traditional transfer case that allows you to select 2WD / 4HI / 4LO. The AWD came with a BW4404 transfer case. The 1997-2001 Ford Explorer 5.0L came as either a 2WD, or AWD. (Note that the difference between the bottom of the lower intakes)ġ997-2001 Ford Ranger 5.0L GT40P lower intake top view: Stock 5.0L lower intake compared to a GT40 Ford Explorer lower intake:ġ997-2001 Ford Explorer 5.0L GT40P lower intake on the left, and a 1995-1997 Ford Explorer 5.0L GT40 lower intake on the right: Stock 5.0L upper intake compared to a Ford Explorer 5.0L upper intake: Interestingly, all GT40 intakes ordered through Ford Racing Performance Parts (FRPP) came with the lower intake that was used for 1995-1997 Ford Explorers. Furthermore, there is no boss for the ACT sensor.
These later model intakes have thinner walls. Meaning, there are zero provisions for internal EGR. Furthermore, there is a boss for the ACT sensor located on runner #5, but it is not drilled.ġ997-2001 Ford Explorer 5.0L lower intake manifolds came solely as external EGR manifolds. Ford GT40P cylinder heads have 4 vertical bars and some are stamped “GT40P”.įord GT40P cylinder head stamp Ford Explorer 5.0L GT40 IntakeĪll Ford Explorer 5.0L engines used a GT40 intake with an external EGR setup, but early-model Explorer intake manifolds have provisions for internal EGR.ġ995 to early 1997 Ford Explorer 5.0L lower intakes have the center EGR hole drilled, but no return line. GT40 cylinder heads have 3 vertical bars stamped on the side of the head as well as the word “GT”. To verify whether you have GT40 or GT40P cylinder heads, examine the side of each cylinder head. GT40P Head – Mid 1997+ Explorer/Mountaineer SUV Models – Part #F77E-AA (Ford Racing # RF-F87E-9K461-BB) GT40 Head – 1996-Mid 1997 Ford Explorer & Mountaineer SUV – Part #F1ZE-AA (Ford Racing #RF-F87E-9K461-BA) GT40 & GT40P Head Specifications: Head Type Both have 1.84″ intake valves, but the GT40 has a 1.54″ exhaust valve whilst the GT40P cylinder heads have a slightly smaller one at 1.46″. GT40P specific headers are needed unless you use spark plug wires with 90 degree boots to clear the heads.įinally, the last difference between the two are valves. The GT40P heads also had a different spark plug placement making header choice important. The GT40 heads have thermactor holes built in to connect to the EGR/smog equipment whereas the GT40P heads us an external EGR connective system. The 5.0L with the GT40 head had a 9.0:1 compression, and the 5.0L with the GT40P head had 9.1:1 compression. The GT40P heads had a small combustion chamber ranging from 58-61cc while the GT40 heads had a 63-66cc combustion chamber. The GT40 & GT40P heads had a few differences that are note-worthy, the most importantly being the bump in compression. What Is The Difference Between GT40 And GT40P Heads?
#1999 ford explorer limited edition v8 free
GT40/GT40P heads were a more free flowing cylinder head that outperformed the factory E7 heads that were found on most 5.0 Fox Body Mustangs. They were most famous for their debut on the 1993 Cobra. GT40 heads are a factory small block ford head found on a certain vehicles. Ford Explorer 5.0L Camshaftĥ.0L Truck, Explorer Camshaft F4TE-6250-BA
The intake manifold is a Ford Mustang Cobra-like “GT40” unit, but it’s been heavily modified and tuned for the truck, so it’s not a direct off-the-shelf swap.
They also accommodate different spark-plug angles that facilitate easier plug replacement. The 5.0L became available in the AWD Ford Explorer in 1997.Īlthough the Explorer’s 5.0L uses the same short block as the 1995 Ford Mustang, the heads are described as “hybrids” that incorporate Ford’s best design practices for knock control, emissions, airflow, and fuel economy. For 1997, revised cylinder heads increased output of the 5.0L V8 to 215 hp. It was only available in the 2wd models that first year, and had 210 hp and 280 ft-lb of torque. This page is going to talk solely about the engine itself.įord introduced the 5.0L V8 as an option for the Explorer in 1996.
In the past, we’ve shared information about installing a 5.0L V8 from a 1996-2001 Ford Explorer in to your Ford Ranger.