Explorer people i need to know if there is a differents between a 95 push rod motor and a 99 pushrod .I have a chance to pickup a 99 with 23k for 350.00 i just need to know if im going to have any problems with the electronics like o2,or ecm or timing problems the 95 is a 4x4 the 99 is 2wd

 

Should be OK with pushrod to pushrod motor. Any changes to controls systems - EGR, O2's...are external to the engine. When you get the motor a quick visual will show you of any differences. Use your old PCM/ECM and wiring harness. Move any missing components from your old engine to the new one and any new ones from the new one that were not on the old one can be trashed. I don't think you'll have any extra parts on this one however.

 

Dont know where you would get a 99 pushrod engine (OHV) as Ford discontinued them in mid 97, going to the (SOHC) single overhead crank, which had all kinds of problems with the timing chains and tensioners. They are NOT interchangable

 

that's funny I have a 2000 xls that I bought new a ordered it with the ohv push rod motor because of all the problems with the sohc motor but any way it should be an easy swap my x is a 2000 but on the plate mounted on the block says it was manufactured in 98 so I cant see it being to difficult of a swap

 

Doug Anderson, Automotive Rebuilder, April 2001

BLOCKS
There have been three blocks used for the 4.0L. Each one is unique in some way, so none of them can be interchanged.

1990-’94
The first 4.0L block was a 90TM-AB casting. It had six bolt holes on the passenger side and 10 bolt holes on the driver’s side. The dipstick hole measured about 0.380½ in diameter.

1995-’96
The original block was changed in ’95. The new 95TM-AB casting had two more bolt holes on the passenger side and two more on the driver’s side for a total of eight on the right and 12 on the left (see photos above). The dipstick hole remained the same at 0.380½.

1997-2000
The block was redesigned again in ’97 to reduce noise, vibration and harshness (NVH). Both of the pan rails on the 97TM-AA casting were wider and there were two more gussets added between the pan rail and the horizontal rib that’s right above it on the passenger side. The dipstick hole on this block was enlarged to about 0.435½

Note: The article says the blocks can't be interchanged but this was a comment on rebuilding and swapping engine parts from year to year. I don't see a problem with the basic fit into the engine compartment or up to the tranny.

 

Same article says the crank in 1997 went from 6 flywheel hoels to 8. So your flexplate would have to be upgraded to a later one.

 

The 2000 model year was the last for the OHV 4.0. As Jharger says, try to get the flexplate from the 99 to use. The 99 engine is OBD II, so you will indeed have to use your old 95 electronics, but it will bolt up fine and is an excellent engine. All design flaws were fixed by 97-00, and then Ford dropped it for the SOHC. Figures.....

 

I read the later 4.0's had smaller area exhaust ports....something about speeding up the exhaust gas out of the combustion chamber to help remove heat...sounds like more of a restriction in my book.

Does this sound like an imporvement?

 

Thanks for all your input just finished the change and everything went smooth.Just used the 99 as a long block change used all my 95 sensors and ECM