American-expedition-vehicles Tummy Tucker – TJ Wrangler NON-Rubicon Manuel d'utilisateur télécharger pdf (Page 8)

Installation Instructions:Tummy Tucker™ – TJ Wrangler NON-Rubicon

Nth30115 v4.doc page 8 of 11 Download @ www.nthdegreemobility.com

DO NOT use a torch or plasma cutter, etc. to clearance the isolator housing because you will light the

rubber on fire and need a new shifter cane!

Note: if you have an automatic and hear 3-4 ‘thumps’ during a hard launch, these are due to the

torque ‘pulses’ created by the torque converter, which are moving the t-case front output up high

enough to touch the floor – this should never occur with your NV231 t-case and means your t-case is

shimmed too high (see appendix).

get a powertrain angle from various places such as the driveshaft output flange or engine damper pulley,

but do not use the engine or transmission oil pans – they are not accurate enough. The double-Cardan

joint on your custom rear drive shaft cannot run vibration-free if its operating angle is over 22 degrees. If

it is, you will likely need to make changes to solve vibrations – consult the appendix for more information.

Step 15: Shifter Clearance Modification – ‘04+ Manual Transmission Vehicles Only

. Late in the 2003

model year, Jeep and New Venture Gear changed the design of the shifter cane isolator, so the following

procedure applies to all ‘04+ models and a few ’03 Wranglers (if you have a body and motor mount lift,

you probably will not require this step).

Like the old design, the new shifter ‘cane’ has a large rubber isolator encased in a metal housing, but

the new design can be identified by the fact that this isolator is in front of the main shaft (instead of in line

with it), and attaches via a bolt down the center of the isolator. With the TT installed, this new oversized-

and-forward-mounted isolator will hit the surrounding plastic of the center console when the trans is in 1

, and maybe even 5

gears – this will cause the transmission to ‘pop’ out of these gears under high-

rpm load unless corrected.

To correct the issue, first loosen the shifter boot base from the center console by gently squeezing

the plastic frame at the base of the boot in the center of the front and back surfaces until it comes free.

You will now be able to see where the interference occurs when you place the trans in 1

gear – mark

this area on the front side of the shifter isolator’s metal housing. Next, remove the upper portion of the

shifter along with the isolator by removing the vertical bolt that goes down through the top of the isolator.

Use any type of grinder to create a ‘window’ in the front of the housing and into the rubber approximately

¼” deep - this will not adversely affect the function of the isolator or its integrity, but will provide the

needed clearance as shown in figure X. Once clearanced, reinstall the shifter for the next step, but

reinstall the boot after the test drive.

Step 16: Test Drive

. Once all fasteners are properly torqued and all supports removed, test drive the

Jeep to check for vibrations or clearance issues, but before you start the engine, make sure to check for

clearance between the engine cooling fan and the bottom of the shroud. If the fan is ‘stuck’ on the

shroud or very close to it (under ¼”), go to the appendix for the solution first.

When you start the engine, you may notice 3-4 ‘jolts’ just as the engine starts running. This is normal

and is a result of the new dual-mount system you installed with the TT. It is a small trade-off for the

additional control over powertrain motion that the dual mounts provide -which in turn keeps the trans/t-

case position under control so that they don’t knock against the tunnel, TT, etc. Once running, you

should not feel or hear any new ‘buzzing’ or rattling. If you do, this indicates contact between the

powertrain and the TT or body floor. Find the contact and correct as necessary with shims, more floor

mods, etc. (see appendix). Contact during certain rough conditions may occur and is generally not

detrimental – you can test for some things by doing hard launches (t-case may touch floor), and

compression braking (t-case may touch TT) – if the contact is detectable, it may be desirable to increase

the appropriate clearance area. You can also test drive over washboard, but the contact will be hard to

hear – if you provided the proper ¼+” clearances, you will rarely hit and not damage anything.

Next, confirm that the t-case shift linkage still functions properly – that you can get into and out of

both 2-High and 4-Low. If not, the linkage may need readjustment.

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American-expedition-vehicles Tummy Tucker – TJ Wrangler NON-Rubicon Manuel d'utilisateur Page 8

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