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General Forums => The Mess Hall => Topic started by: 93yjFirstJeep on August 24, 2009, 10:21:56 AM

Title: 4.0 tb question
Post by: 93yjFirstJeep on August 24, 2009, 10:21:56 AM: Does the 4.0 tb necessarily have to come off of a wrangler or could it be another jeep like an xj or zj?
Title: Re: 4.0 tb question
Post by: roksld13 on August 24, 2009, 11:15:56 AM: as long as the bolt pattern lines up it should be fine, i got my tb off a 99 wj for my 97 tj. hope that helps!
Title: Re: 4.0 tb question
Post by: sharpxmen on August 24, 2009, 11:33:42 AM: got mine off a Cherokee, not sure what year but worked just fine - just needed to swap the IAC and TPS from mine.
Title: Re: 4.0 tb question
Post by: OH-YJ on August 24, 2009, 03:03:30 PM: Quote from: sharpxmen on August 24, 2009, 11:33:42 AM
got mine off a Cherokee, not sure what year but worked just fine - just needed to swap the IAC and TPS from mine.

X2. I got mine off of a Cherokee as well. And make sure you swap the IAC and TPS from the 2.5 to the 4.0. I failed to do this and it resulted in unwanted revving. Live and learn.
Title: Re: 4.0 tb question
Post by: Bounty Hunter on August 28, 2009, 01:36:04 AM: You can use '91-'04 TB's off a 4.0L engine, but for '96+ you will have to put a cap on the MAP sensor vacuum port at the base.
Title: Re: 4.0 tb question
Post by: stan98tj on August 28, 2009, 08:37:06 AM: Quote from: OH-YJ on August 24, 2009, 03:03:30 PM
X2. I got mine off of a Cherokee as well. And make sure you swap the IAC and TPS from the 2.5 to the 4.0. I failed to do this and it resulted in unwanted revving. Live and learn.
does that have to be done on a 62mm TB...maybe thats why im gettin some weird revving in park and neutral? i think i should bore out my intake port to 62mm as well..should make a difference right?
Title: Re: 4.0 tb question
Post by: jdarg on August 28, 2009, 09:03:38 AM: If the intake isn't bored to match it will almost certainly hurt performance because of the airflow being disrupted by hitting the top of the manifold along the edges.

Matching the intake opening and even radiusing the intake opening are worthwhile if not necessary for this mod to help.
Title: Re: 4.0 tb question
Post by: Bounty Hunter on September 01, 2009, 10:15:39 PM: Quote from: stan98tj on August 28, 2009, 08:37:06 AM
does that have to be done on a 62mm TB...maybe thats why im gettin some weird revving in park and neutral? i think i should bore out my intake port to 62mm as well..should make a difference right?
Regardless of using a 4.0L TB or a 62mm TB, you should use the sensors and IAC housing from your stock TB.
Title: Re: 4.0 tb question
Post by: dwtaylorpdx on September 09, 2009, 12:51:55 AM: ANother note, if you don't match the intake to the
throttle body it can stick the throttle slightly open.

Dave
Title: Re: 4.0 tb question
Post by: Bounty Hunter on September 09, 2009, 02:32:40 PM: Quote from: dwtaylorpdx on September 09, 2009, 12:51:55 AM
ANother note, if you don't match the intake to the
throttle body it can stick the throttle slightly open.

Dave
How? The throttle plate is not close enough to the intake opening to have any interference.
Title: Re: 4.0 tb question
Post by: sharpxmen on September 09, 2009, 09:03:35 PM: Quote from: Bounty Hunter on September 09, 2009, 02:32:40 PM
How? The throttle plate is not close enough to the intake opening to have any interference.

x2, it won't get stuck

(http://i57.photobucket.com/albums/g222/sharpxmen/Misc/tb_butterfly_open_1.jpg) (http://i57.photobucket.com/albums/g222/sharpxmen/Misc/tb_butterfly_open_2.jpg)

(http://i57.photobucket.com/albums/g222/sharpxmen/Misc/tb_butterfly_open_3.jpg)

the diameter of the butterfly in this one is 60mm, not accurate but close enough for an idea, the measurement shows the max width of the butterfly at the bottom face of the t/b (smaller than the 2.5L opening so like bounty hunter said, is not wide enough to get stuck.