I know this is a dumb question, but if i were to swap my 2.5l for a 4.0l could i still use the trans. From my 2.5l or would i have to get a different trans for the 4.0l?????advice

I think you would have to get an AX-15

Not an easy swap, from what I've read. If you can get the trans & transfer case that's on the 4.0L now, it might go a little easier. Then you'd only have the rest of the stuff to sort out. Fuel delivery, exhaust, wiring/computer, emissions, & drive shafts to name a few.

Well you could just as easy buy a whole wiring harness and ECU from a 4.0

you don't want the ax-5 behind anything. The ax-5 wasnt designed to handle that much engine. Its basically a ticking time bomb if you ask me. You need the ax-15 atleast. I would look for the NV3550 if you can lay hands on one.

what do you mean by "ticking time bomb", and how hard is it to find that other trans. that you said was good???

The ax-5 is well known for losing 5th gear frequently. I think it was originally supposed to be a four speed and they stuck fifth on there.

As far as the NV3500 here are some applications according to Wikipedia:

1993-1998 Chevrolet & GMC CK with Vortec 4300
1999–2006 Chevrolet Silverado 1500 and 2500LD
1999–2006 GMC Sierra 1500 and 2500LD
1993-2003 GM S (S10 etc) trucks with 4.3 liter Vortec 4300
1994-2001 Dodge Ram 1500 [4]
1994-1995 Dodge Ram 2500 Light Duty
1994-???? Dodge Dakota V8

Thats for the NV3500. There Is also a NV3550 that came behind the 4.0 in alot of the new production Jeeps. Liberties, Wranglers and Cherokees maybe.


Here are the gears for each one:


AX-5
First Gear 3.93
Second Gear 2.33
Third Gear 1.45
Fourth Gear 1.00
Fifth Gear .85
Reverse Gear 4.74


NV3500
First Gear 4.02
Second Gear 2.32
Third Gear 1.40
Fourth Gear 1.00
Fifth Gear 0.73
Reverse Gear 3.55


NV3550
First Gear 4.01
Second Gear 2.33
Third Gear 1.39
Fourth Gear 1.00
Fifth Gear 0.78
Reverse Gear 3.57

Ax-15
First Gear 3.83
Second Gear 2.33
Third Gear 1.44
Fourth Gear 1.00
Fifth Gear 0.79
Reverse Gear 4.22
Reverse 3.57

would you suggest using the ax-15???

the ax5 won't bolt right up anyway to a 4.0, and you don't want it to.

the ax15 is probably easier seeing as you can buy it right out of a yj. the nv3550 is a good one also, and it still came out of wranglers.

or be like me, go crazy old school, t 18, sm465, sm420....these are only if you wanna get crazy wheeling, not as much fun on the street.

thanks, i'll look into getting the nv3550, because that seems the most practical, because i still have to drive back and forth to school every day...

Yeah go with the NV3550

Yeah the NV3550 would be your best bet because it has a nice overdrive for highway driving and a low first gear for weekend crawling