AX15 vs NV3550

[Whoaa]

It seems like both of these transmissions are great for a 5 speed swap. I realize the gear ratios are slightly different.

The total conversion appears to be about the same cost? There seems to be a LOT of them working well behind a stout 351W.

For my application probably 350/350+ hp/tq, big tires and low gears, 60/40 street trail use...never anything to tough or abusive for my old classic.

Is this NV3550 becoming harder to buy, less of them available?

Any input one-way or-another is appreciated!

 

[bronconut73]

The NV isn't made anymore, so you will be buying used or rebuilt which is okay.
The AX is still produced. You could have a new one.

They are very similar, it seems that the AX may have had a slight advantage but not enough to really sway someone.

Jim at WH said that they sell the AX because it is what they can offer new, not rebuilt.

 

[blubuckaroo]

I follow a Jeep forum and the same debate has been going on there for a long time.
I don't know about the AX15, but the NV3550 specs rate it at 300 ft lbs of torque.

 

[DirtDonk]

Your low diff gears will help the transmissions last longer for not being the middle-man between a torquey engine and those big tires. Big help for everything upstream to have the right gearing.

Paul

 

[PCDan]

I went with an AX15 for my 375hp/390 torque crate .... with 4.56 gears for 33s. and 31 spline shafts. Hoping it’s all a good combo.

 

[Whoaa]

I went with an AX15 for my 375hp/390 torque crate .... with 4.56 gears for 33s. and 31 spline shafts. Hoping it’s all a good combo.

That's a stout engine sir! For my application, and smaller engine numbers, I'm running 4:88 gearing w/ 35" rubber.

It seemed like the New Ventures 5 speed was a really good choice for the swap for quite some time. Apparently now that same NV3550 has been superseded to the AX15. From everything I can gather they're very comparable transmissions and both make an excellent swap into a Bronco