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XJ Ask the Question Thread
CF Veteran
Joined: Oct 2011
Posts: 1,812
Likes: 0
From: South Mills, NC
Year: 1998
Model: Cherokee
Engine: Rebuilt 4.0L I6
I've got a friend that's got a 1986 Comanche with the 2.8l and he wants to put a different engine in it. How hard would it be to put the 4.0 in it or maybe grand Cherokee 4.7? Does the firewall need to be modified a lot?
CF Veteran
Joined: Sep 2010
Posts: 12,692
Likes: 6
From: Mercer County, NJ
Year: 2001
Model: Cherokee
Engine: 4.0L I6 HO
I believe yeA, firewall is too far forward to fit. Some renix people need to chime in for sure
CF Veteran
Joined: Aug 2012
Posts: 1,539
Likes: 0
From: ks
Year: 1998
Model: Cherokee
Engine: 4.0
98xj, 4.0, ax15, d30/c8.25, 3.07 gears. I want to swap in 3.55 auto xj axles.
1. I want to stay away from the d30 LP, am I fine to swap in an 91'-99' xj dana 30? If it's pre-95 I will swap over my 297x u-joint axle shafts to replace the 260 shafts.
2. For the 8.25, is any 97+ 29 spline xj 8.25 a good candidate to swap?
3. If I were to swap in 4.10 4cyl axles from an xj, and it had a vacuum disconnect axle, is it fine to run if I swap in a 1 piece shaft and block off the disconnect motor spot on the axle?
Much appreciated fella's.
1. I want to stay away from the d30 LP, am I fine to swap in an 91'-99' xj dana 30? If it's pre-95 I will swap over my 297x u-joint axle shafts to replace the 260 shafts.
2. For the 8.25, is any 97+ 29 spline xj 8.25 a good candidate to swap?
3. If I were to swap in 4.10 4cyl axles from an xj, and it had a vacuum disconnect axle, is it fine to run if I swap in a 1 piece shaft and block off the disconnect motor spot on the axle?
Much appreciated fella's.
Moderator of Jeeps
Joined: Jul 2011
Posts: 21,029
Likes: 3
From: Frederick, MD from Cleveland, OH
Year: 1993 YJ Wrangler
Engine: 4.0 I6
98xj, 4.0, ax15, d30/c8.25, 3.07 gears. I want to swap in 3.55 auto xj axles.
1. I want to stay away from the d30 LP, am I fine to swap in an 91'-99' xj dana 30? If it's pre-95 I will swap over my 297x u-joint axle shafts to replace the 260 shafts.
2. For the 8.25, is any 97+ 29 spline xj 8.25 a good candidate to swap?
3. If I were to swap in 4.10 4cyl axles from an xj, and it had a vacuum disconnect axle, is it fine to run if I swap in a 1 piece shaft and block off the motor mount on the axle?
Much appreciated fella's.
1. I want to stay away from the d30 LP, am I fine to swap in an 91'-99' xj dana 30? If it's pre-95 I will swap over my 297x u-joint axle shafts to replace the 260 shafts.
2. For the 8.25, is any 97+ 29 spline xj 8.25 a good candidate to swap?
3. If I were to swap in 4.10 4cyl axles from an xj, and it had a vacuum disconnect axle, is it fine to run if I swap in a 1 piece shaft and block off the motor mount on the axle?
Much appreciated fella's.
2. Not sure of the cutoff year between 27 and 29 splines. All 29 splines are the same, though.
3. Yep, or just remove the cover, slide the shift collar over, and secure it in place.
CF Veteran
Joined: Aug 2012
Posts: 1,539
Likes: 0
From: ks
Year: 1998
Model: Cherokee
Engine: 4.0
::CF Moderator::
Joined: Aug 2011
Posts: 43,971
Likes: 1,578
From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
Best bet is the 3.4 GM motor as it's pretty much a bolt-in. Search and you'll find some good stuff on it.
CF Veteran
Joined: Mar 2010
Posts: 47,923
Likes: 38
From: Broward County Fl.
Year: 1989 xj sport 2dr
Model: Cherokee
Engine: 12 hole bosch Injectors
http://www.lunghd.com/Tech_Articles/...Project_XJ.htm