Topic: 63mm TB bored & ported for 91-04 4.0L & 2.5L

[SKI BOY]

GUARDIAN,

   LOOKS LIKE "EXTREMEFI" IS LEGIT AS THEY ARE STATING THAT THEY BORE OUT THE TB TO 63MM. BUT "PROTECHGOTITALL" ONLY HAS STOCK 2.5L TB'S THAT THEY STATE ARE FOR 4.0L/2.5L AND AS I ARGUED WITH THEM , WHO WOULD BUY A 2.5 TB TO PUT ON A 4.0. I WOULD ADVISE ALL TO STAY AWAY FROM THEM. THEY EITHER DON'T HAVE A CLUE ABOUT THE DIFFERENCE IN THE TB'S OR ARE SCAMMERS.
   I ENDED UP GETTING A REFUND AND FOUND A USED 4.0L TB WITH ALL THE SENSORS FOR $ 50 & A TBS FOR $26. DID SWAP OUT OF SENSORS FOR THE 2.5 AND HAVE SEEN A NOTICEABLE INCREASE IN HP/TORQUE SO THE BORED 63MM TB'S SHOULD SEE EVEN MORE OF AN INCREASE!!

[MA2LA]

One thing that alot of people over look is that the inlrt on the 2.5s intake is just shy of being big enough for the stock 4.0 tb. When you put anything bigger on its like your running a restrictor plate since all the air your letting in now has to flow through a smaller opening that is square edged.

[Guardian7]

I am leaning towards doing the same, just find a used 4.0 TB, were did you find yours?

[SKI BOY]

Guardian--

Got mine off e-bay! $36. + 12 s/h. There seems to be quite a few that come up on auction, go to 'jeep wrangler thottle body'. My local junk yard has them for $55-60. I was lucky that the one i got had all the 4.0L sensors on it that I parted out so my net cost was only about $10.00.
There are also alot of sellers with the 4.0L TB spacers!! Good luck.
Like 'ma2la said the 2.5 intake manifold is smaller than the 4.00... I plan to port my intake this sring when I take the exhaust manifold off for stud replacement!