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Topic Review (Newest First)
09-28-2011 01:50 PM
2004_Silver_Sport Ok thank you guys for the tips and info. Hopefully it all goes smoothly when it comes time
09-28-2011 01:40 PM
UnlimitedLJ04
Quote:
Originally Posted by Jerry Bransford View Post
My point is that the cat cannot sit in its original location with a TT and your latest suggestion to modifiy the hanger moves the cat up above its original location. I'm already aware the fix is to move the cat higher where it would not be in its original location.
I think you misunderstood. I was referring relative to the frame, not relative to the skid....you modify the hanger mount so the cat sits as close to the original location as possible. You're moving the skid up and leaving the cat close to where it was...shortening the hanger mount, almost like if you were going to lower the cat. Like I said, if you raise the cat too much, you push the 90 degree bend into the passenger side upper control arm mount and lever the mini-cats closer to the engine block on the drivers side.

Quote:
Originally Posted by 2004_Silver_Sport View Post
Will it make a difference if I'm not using the original mount? I'll be getting AEV's LoPro mount along with their Ultra clearance skid most likely.
I don't know much about the AEV LoPro mount, so I can't help you there. AEV doesn't sell tend to sell junk, so I'm sure they've thought of the cat. Give them a call as ask them.
09-28-2011 12:38 PM
2004_Silver_Sport
Quote:
Originally Posted by UnlimitedLJ04

the cat isn't mounted directly to the skid, its mounted on a hanger that is part of the tranny mount. you need to modify the hanger somehow, where the cat sits (if you're using the original tranny mount).
Will it make a difference if I'm not using the original mount? I'll be getting AEV's LoPro mount along with their Ultra clearance skid most likely.
09-28-2011 12:37 PM
Jerry Bransford Come on, you know that I know the cat isn't mounted to the skid. What I was pointing out was where you said "you'll need to cut and reweld (or drill/bolt) the mount so the cat sits in its original location."

My point is that the cat cannot sit in its original location with a TT and your latest suggestion to modifiy the hanger moves the cat up above its original location. I'm already aware the fix is to move the cat higher where it would not be in its original location.
09-28-2011 12:31 PM
UnlimitedLJ04
Quote:
Originally Posted by Jerry Bransford View Post
How can the main cat sit in its original location with the t-case and skidplate sitting higher with the TT? That is why mine is vibrating, the TT t-case skidplate has raised the cat and exhaust up higher than the factory position.
the cat isn't mounted directly to the skid, its mounted on a hanger that is part of the tranny mount. you need to modify the hanger somehow, where the cat sits (if you're using the original tranny mount).


(stole from Knucklehead)

here's mine with the JeepMedic:


I bent the hanger attached to the cat a bit to help. Smarter folks cut the hanger off the tranny mount, drill two holes and bolt them together. i didn't think of that.

You can move it the cat up a bit if you have a body lift, but you gotta pay attention to the torquing on the other end where the mini-cats are mounted to the exhaust manifold. Putting the driver side pipe in a bind will lead to problems in itself, but you can loosen them a bit and retighten them down to help. You can also end up pushing the 90 degree bend on the passenger side into the upper control arm mount. I had the same issues too...some pry bar + wood block + hammering involved. also, once you modify the cat hanger, you may also need to modify the other two downstream hangers at the muffler & tailpipe so the whole assembly doesn't wobble and rattle on the gas tank or shock.

My cat pipe used to rattle bad on the control arm mount...then the mini-cats rattled from being a bind, and the downpipe rattled on the engine skid at one point. Took a few tries to get the pipe positioned right. I had two spots on the engine skid that needed a few passes of grinding to clear the downpipe. Depending on the skid design, you can grind out some clearance out the TT skid & engine skid plate...all these little things seem pretty common with TTs. my stock tailpipe rattled on the shock off-road sometimes...till i pretzeled it and it got replaced...they raised both hangers to match and now all is well
09-28-2011 12:07 PM
Jerry Bransford
Quote:
Originally Posted by UnlimitedLJ04 View Post
you won't need to get a new exhaust made. you may need to modify the cat hanger/mount under the t-case skid. that mounts to the t-case skid, so when you raise the t-case skid (TT), you'll need to cut and reweld (or drill/bolt) the mount so the cat sits in its original location.
How can the main cat be repositioned to sit in its original location with the t-case and skidplate sitting higher with the TT? That is why mine is vibrating, the TT t-case skidplate is now high enough that the cat is touching the skidplate and vibrating against it. I see no way to fix it other than to have the exhaust pipe and hanger reworked enough so the cat is positioned slightly higher than it was so it can no longer touch the t-case skidplate.
09-27-2011 10:51 PM
2004_Silver_Sport
Quote:
Originally Posted by UnlimitedLJ04

on your sport, the exhaust has 3 cats....and its all one piece from the exhaust manifold all the way to through the 3rd cat. you're not raising the exhaust, just keeping where it is. you can't raise it without torquing the heck out of the one-piece cat pipe thats mounted to the engine.

you won't need to get a new exhaust made. you may need to modify the cat hanger/mount under the t-case skid. that mounts to the t-case skid, so when you raise the t-case skid (TT), you'll need to cut and reweld (or drill/bolt) the mount so the cat sits in its original location.

you'll also likely need to do some pry bar & hammer work on the exhaust pipes, especially between the mini cats and the passenger front upper control arm mount. thats where the exhaust likes to rub after a TT.
Thank you Unlimited! Is there anything else that I should be expecting besides exhaust clearance? Sorry for all the questions I'm just trying to know exactly what to expect and what I'm getting into.

I also have the Novak cable shifter so I won't have to worry about that.
09-27-2011 01:23 PM
UnlimitedLJ04
Quote:
Originally Posted by 2004_Silver_Sport View Post
Could I just have the hangers modified so the exhaust sits higher? Or will I have to get a whole new exhaust system?
on your sport, the exhaust has 3 cats....and its all one piece from the exhaust manifold all the way to through the 3rd cat. you're not raising the exhaust, just keeping where it is. you can't raise it without torquing the heck out of the one-piece cat pipe thats mounted to the engine.

you won't need to get a new exhaust made. you may need to modify the cat hanger/mount under the t-case skid. that mounts to the t-case skid, so when you raise the t-case skid (TT), you'll need to cut and reweld (or drill/bolt) the mount so the cat sits in its original location.

you'll also likely need to do some pry bar & hammer work on the exhaust pipes, especially between the mini cats and the passenger front upper control arm mount. thats where the exhaust likes to rub after a TT.
09-27-2011 12:28 PM
2004_Silver_Sport
Quote:
Originally Posted by Jerry Bransford
Be prepared to need some custom exhaust work after the TT is installed, my exaust pipe vibrates and buzzes like crazy every so often after installing a partial tummy-tuck skidplate. The TT lifted everything up so much that it is slightly contacting the exhaust pipe in a few areas and vibrating, pretty loudly at times.
Could I just have the hangers modified so the exhaust sits higher? Or will I have to get a whole new exhaust system?
09-27-2011 10:47 AM
Jerry Bransford
Quote:
Originally Posted by 2004_Silver_Sport View Post
... so I should get the lift and the TT at the same time so I don't have to buy 2 shafts right?
Not a bad idea at all. Be prepared to need some custom exhaust work after the TT is installed, my exaust pipe vibrates and buzzes like crazy every so often after installing a partial tummy-tuck skidplate. The TT lifted everything up so much that it is slightly contacting the exhaust pipe in a few areas and vibrating, pretty loudly at times.
09-27-2011 10:31 AM
2004_Silver_Sport Thanks for the info guys. Sound like I'll just wait till I get the SYE. Which is probably smart because I plan on ditching the 2" BB for a true suspension lift. I think I might go for a 2.5-3" suspension lift and do the whole LCG thing. But if I get my lift and then get the SYE that would put my t-case at being lifted 2.5-3" plus the 2.5" for the TT. So it will be ~5-5.5" of t-case lift so I should get the lift and the TT at the same time so I don't have to buy 2 shafts right?
09-27-2011 07:53 AM
UnlimitedLJ04 do the math:
2.5" t-case lift + 2" lift = 4.5" total lift seen by t-case.

yes, you'll definitely need a SYE.

now if you're asking why I didn't subtract 1" for the MML, think of it this way: draw an imaginary line from the front of the crankshaft to the output of the t-case. now measure the angle of this line in relation to the frame. from the factory, it actually points downward toward the rear axle slightly. when you lift the t-case 2.5", that line is now pointed more parallel to the frame...adding the MML helps offset this effect some, so just MML returns that line closer to stock.

To put it in perspective...I have a 1.25" BL + 1" MML, with a 2.5" TT & the stock mount. When I lifted 2.5", I needed a SYE/CV shaft...and my driveshaft is 10" longer than yours.
09-27-2011 06:28 AM
TnDz TJ My guess is yes.... just a guess, but yes... vibes 'should' be prominent. You have a 2" BB, plus the 1"MML, this is a good running setup for no vibes without a dbl cardin style shaft... in essence, this setup is the same as running a 1" tcase drop.... you just lift the motor instead of dropping the case. Just did this myself.

Raising your tcase 2" with what you have now is just like trying to run a 4" lift (2"BB and 2" TT measurement-wise) without SYE and dbl cardin shaft.... its a crap shoot, you may get lucky.... you may not. I say NO....but thats me..

I would wait. Get the SYE, install it and then the TT... measure for the dbl cardin shaft and you will be golden!
09-26-2011 11:45 PM
2004_Silver_Sport
TT belly up skid question

So I'm lookin at getting a belly up skip pretty soon but i had some questions on if I should get it or not yet. Right now I have a 2" bb coil spacer lift and a 1.25" body lift with a 1" mml and I currently have no driveline vibes but dont have a SYE or CV driveshaft. My question is will i have vibes if i raise the t-case another 2-2.5" with the tummy tuck? I know that every Jeep is different when it comes to if it gets vibes or not but i was just wondering if you guys that have experience in this think i will get vibes or not. Or if i should wait until i have an SYE and CV to get the transfer skid. Thanks in advance

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