Craig Stephenson

I was wondering if anyone could help me figure out what transfer case and transmission my 1998 Tj 2.5 4cyl has? Also is I believe the gear ratio in 98's is 4:10 while in 00 I believe it is 3:73, that is for the dana 30 and 35 found in the four cyl. Is this correct?

beserkur

1998 TJ
Engine
2.5L I-4 151 cu in - 1997-2002
* 120 hp @ 5,400 RPM
* 140 ft/lbs @ 3,500 RPM
* OHV
* Sequential port fuel injection
* 2 valves per cylinder
* Compression ratio = 9.20:1 (97-00) / 9.10:1 (01-02)

Transmission

Automatic:

30rh - 1997-2002
* 3 speed automatic
* Used with 4 cyl models
* 23 spline output

* Ratios:

1st - 2.74
2nd - 1.54
3rd - 1.00
Rev - 2.20

Manual:

AX-5 - 1997-2002
* 5 speed manual
* Used with 4 cyl models
* 10 spline input
* 21 spline output

* Ratios:

1st - 3.93
2nd - 2.33
3rd - 1.45
4th - 1.00
5th - 0.85
Rev - 4.74

Transfer Case

NV231 Command-Trac - 1997-2006
* Used on all TJs except Rubicon models
* 2.72:1 Low range
* Slip yoke
* Gear driven speedometer signal

Gear Ratios

3.73 - 1998-2006
* Optional ratio used with 6 cyl manual and automatic except the Rubicon
* Standard ratio used with most 4 cyl automatics
* Standard ratio used with 4 cyl 6 speed
* Standard ratio used with Dana 44 rear axle except the Rubicon

4.10 - 1997-2006
* Standard ratio used with 4 cyl 5 speed manual
* Standard ratio used with Rubicon

Axles


Dana 30 (181 mm) - 1997-2006
* Front axle used on all TJs except the Rubicon model
* Stock gear ratio options = 3.07, 3.55, 3.73, 4.10, 4.56
* Carrier break = 3.55 / 3.73
* Open carrier - no Trac-Lok limited slip option
* Ring gear diameter = 7.2"
* Ring gear bolts = (10) 3/8 x 20 RH
* Low pinion (short pinion)
* Pinion shaft diameter = 1.376"
* Pinion shaft spline count = 26
* Axle shaft diameter = 1.18"
* Axle shaft spline count = 27 both inner and outer
* Axle shaft u-joints = 5-760x / 5-297x
* WMS-WMS = approximately 60.5"
* 5 on 4.5" bolt pattern

Dana 35c (194mm) - 1997-2006
* Standard rear axle used on all TJs except the Rubicon model
* Stock gear ratio options = 3.07, 3.55, 3.73, 4.10, 4.56
* Carrier break = 3.31 / 3.55
* Optional Trac-Lok limited slip differential
* Ring gear diameter = 7.5625"
* Ring gear bolts = (8) 3/8 x 24 RH - NOTE: 7/16" x 20 RH used on later model TJs
* Low pinion
* Pinion shaft diameter = 1.406"
* Pinion shaft spline count = 26
* Axle shaft diameter = 1.18"
* Axle shaft spline count = 27
* WMS-WMS = approximately 60.5"
* 5 on 4.5" bolt pattern
* Rubber pressed-in fill plug


Dana 44 (216mm) - 1997-2006
* Optional rear axle used on 6 cyl models except the Rubicon model
* Stock gear ratio options - 3.55 (97 only), 3.73
* Carrier Break = 3.73 / 3.92
* Standard Trac-Lok limited slip differential on early model TJs / Optional on later model TJs
* Ring gear diameter = 8.5"
* Ring gear bolts = (10) 3/8 x 24 RH - Note: 7/16" x 20 RH used on later model TJs
* Low pinion
* Pinion shaft diameter = 1.376"
* Pinion shaft spline count = 26
* Axle shaft diameter = 1.31"
* Axle shaft spline count = 30
* WMS-WMS = approximately 60.5"
* 5 on 4.5" bolt pattern
* Available for the 1997 and newer 4.0L TJs only after 7/7/96
* Threaded 3/8" fill plug

Also,If you want to know what gears you have look for a tag under one of the diff cover bolts in the 9 o'clock position. This will tell you what ratio the Jeep originally had and likely should still have. Here is an example of an axle tag you would find on a TJ axle:

Craig Stephenson

Thank you very much, very appreciated! I know my axles will not stand up to a 350 swap for wheeling but I am pretty sure you can get an adapter form advance adapters to bolt a 350 chevy to my transmission. What is the concensus on my tranny (AX-5) and transfer case (NV231) standing up to and being reliable enough for some fairly tuff wheeling with this engine swap?

oldfart

The axles and tcase might last for a little while but I don't think the ax5 would last more than about five minutes.

Sid1966

i dont have any problems snapping stock axles with my 4.0,cant see them lasting very long behind a v8

Craig Stephenson

Thank guys, any input on how hard it is (and what kind of transmission/t-case) to use behind an LT1 350 chevy. I want to retain a manual tranny.

Sid1966

i would find a manual chev trans and matching t case,better get some fullsize axles too.an LT1 with manual trans will blow those diffs apart.

Craig Stephenson

Thanks sid, I know the stock axles won't hold up, but I don't want full size axles because of the width! I like how narrow my jeep is for going through tight trails. I'm going to start saving and buy a set of built currie high pinion 9" housings in the stock width with maby 5:29's and 37's. But this is down the road a ways. I also want to four link the rear and go with coil overs all the way around! Once I start to build I will post a bunch of pics.