Wanting To Do The 99+ Intake Swap On My 87 Mj

[MJfanatic87]

Will the 99+ intake bolt up to the 87 renix head or do I need to do some modifications to make it work?

[MJfanatic87]

And what throttle body should I use?

[onlyinajeep726]

Will the 99+ intake bolt up to the 87 renix head or do I need to do some modifications to make it work?

Yes, but the ports won't line up.  IIRC (and I believe cruiser will step in if I'm wrong), to use the newer intake on the Renix head, you need to use the Renix manifold gasket, not the HO style.  Other than that, the bolt holes line up fine.

 

And what throttle body should I use?

You will use the HO style throttle body, but use a '91 - '95 throttle body.

[ftpiercecracker1]

Don't forget that if you plan on doing this, you will also need to swap the power steering pump and fashion a TPS adapter.  There are literally dozens of right ups on the internet covering the 99+ intake swap. 

 

 

Parts list:

99+ intake

Different power steering pump (bolt on, easy)

TPS adapter (can be difficult) 

Different length belt (the new steering pump makes your original belt unusable)

Different Intake Gasket (because, why would you use the old one?)

Different fuel rail (Renix mounting holes don't line up)

Custom fuel lines (Don't be scared there easy)

 

 

 

Sooo, all tallied you need to do a ton of work just for the fancy new intake.  :dunno:

[onlyinajeep726]

Don't forget that if you plan on doing this, you will also need to swap the power steering pump and fashion a TPS adapter.  There are literally dozens of right ups on the internet covering the 99+ intake swap. 

 

 

Parts list:

99+ intake

Different power steering pump (bolt on, easy)

TPS adapter (can be difficult) 

Different length belt (the new steering pump makes your original belt unusable)

Different Intake Gasket (because, why would you use the old one?)

Different fuel rail (Renix mounting holes don't line up)

Custom fuel lines (Don't be scared there easy)

 

 

 

Sooo, all tallied you need to do a ton of work just for the fancy new intake.  :dunno:

 

I'm glad you added this list... I completely forgot about the PSP and fuel rail.

 

To the OP:  If you decide to swap them, a fuel rail from a '91 - '95 is what you'll need.  Those particular years have the return line port on the rail.  It will bolt onto a '99+ intake.  As far as the belt, you will likely need a 99.5" or 100" belt.  Since there is a tensioner pulley on the PSP bracketry, you'll use that to tension it obviously.  One problem I ran into with this is the timing chain cover.  The HO belt routing has the belt run closer to the passenger's side and the timing light port is smack dab in the middle of where the belt needs to run.  I found this out after I had everything bolted back up and had to use a dremmel to cut and grind part of it off.  It's certainly not going to be a cake walk, but it can be done.

[MJfanatic87]

The reason I ask is bc I just had the renix head redone and I really hate to not use it.

I am just looking for ways to add a little hp and tq to my 87 mj.

[MJfanatic87]

thanks for the wise insight!

I plan on doing a complete master rebuild of the engine and I was looking for some tricks to make more power, so any sugestions is welcome!