5.0 Jeep YJ

Griz700 · 02-09-2009, 11:11 PM

I am building my YJ and have decided to install a 5.0 HO out of a 'stang in it. I am also wanting to keep a 5 speed trans(currently has a AX5) but can't seem to find any AX15's near my area. Has anyone heard if the Ford/Mazda M5R2 out of the F150 will fit into a YJ without too much modification. Any reason this would be a bad swap?

LeadFoot · 02-10-2009, 04:42 PM

Depends on what you want to use the jeep for. Mostly trail rig? Go NP435 and don't look back. I loved mine, granny gear fully rocks! 4th gears 1:1 ratio was plenty for a trail only rig also.

Bryndon · 02-11-2009, 04:10 PM

The HO builds most of it's power at higher RPMs (not off-idle). Unless you are planning on blasting through everything, it is not the best choice for a jeep. A truck 5.0 would be cheaper and more effective.

LeadFoot · 02-12-2009, 09:00 AM

I'm assuming he has the 4 cyc (AX-5). Even so, the 2.5 is so anemic that the 'stand 5.0 still has to make more torque at idle than that thing does!

chuckp · 02-12-2009, 09:14 AM

We've got a couple guys in my club running Mustang motors, no problems at all with low end grunt.

02-09-2009, 11:11 PM	#1
Griz700 Registered Join Date: Feb 2009 Posts: 1 Thanks: 0 Thanked 0 Times in 0 Posts	5.0 Jeep YJ I am building my YJ and have decided to install a 5.0 HO out of a 'stang in it. I am also wanting to keep a 5 speed trans(currently has a AX5) but can't seem to find any AX15's near my area. Has anyone heard if the Ford/Mazda M5R2 out of the F150 will fit into a YJ without too much modification. Any reason this would be a bad swap?

02-10-2009, 04:42 PM	#2
LeadFoot Forum Leader Join Date: Dec 2001 Location: Jacksonville, NC Posts: 7,299 Thanks: 3 Thanked 6 Times in 6 Posts	Depends on what you want to use the jeep for. Mostly trail rig? Go NP435 and don't look back. I loved mine, granny gear fully rocks! 4th gears 1:1 ratio was plenty for a trail only rig also. __________________ '94 YJ '92 YJ '89 YJ '47 Willys The more I interact with society, the more I like my dog.

02-12-2009, 09:00 AM	#4
LeadFoot Forum Leader Join Date: Dec 2001 Location: Jacksonville, NC Posts: 7,299 Thanks: 3 Thanked 6 Times in 6 Posts	I'm assuming he has the 4 cyc (AX-5). Even so, the 2.5 is so anemic that the 'stand 5.0 still has to make more torque at idle than that thing does! __________________ '94 YJ '92 YJ '89 YJ '47 Willys The more I interact with society, the more I like my dog.

02-12-2009, 09:14 AM	#5
chuckp Registered Join Date: May 2001 Location: Minnesota Posts: 967 Thanks: 0 Thanked 0 Times in 0 Posts	We've got a couple guys in my club running Mustang motors, no problems at all with low end grunt. __________________ Chuck P 94 YJ http://www.oldjeep.com

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02-11-2009, 04:10 PM	#3
Bryndon Registered Join Date: Feb 2008 Location: SE Wisconsin Posts: 151 Thanks: 0 Thanked 0 Times in 0 Posts	The HO builds most of it's power at higher RPMs (not off-idle). Unless you are planning on blasting through everything, it is not the best choice for a jeep. A truck 5.0 would be cheaper and more effective.