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Unread 12-18-2009, 07:44 PM   #1
TKFireman
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I would like to upgrade my t176 to a Manuel tranny with overdrive behind my 304. Obviously a NV4500 would be sweet, but a ton of money, and a ton of money in adapters. I was looking at either a AX-15 or a NV3550, there are a couple of wranglers at the local pick and pull with 5 speeds. Jeep will be mostly driven on road, but want it to be capable off road as well.

1. I think the 2000+ ones are NV3550's and pre-2000 is AX-15, is this correct? There are some of each at the lot. The NV3550 has a lower first gear, the AX-15 would possibly be a little easier/cheaper to adapt. I'm leaning toward the NV3550
2. Any other suggestions?
3. What kind of function check can be performed at the lot before I bring one of these home? These were all clunkers, so they were driven onto the car lot, but I'd like to be able to do a simple function check.

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Unread 12-27-2009, 01:41 AM   #2
SST4530
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I would check out Novak adapters and read about the differrent tranny swaps. great site for info.
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Unread 12-27-2009, 05:57 AM   #3
Mike Romain
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With 35" tires and 4.11 gears you won't likely be able to use an overdrive. The RPM will be too low which will lug the engine and just drink gas.
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Unread 12-27-2009, 03:13 PM   #4
rustymudder
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this is from novak's site:

No additional input shaft is typically required for:
AX15, 1988-1999
AW4, 1991-1999
If you are unsure about which to choose, follow this rule:
If you have a 23 spline transmission output shaft whose end extends ~1/2" past the rear face of the transmission flange, you do not need a new input shaft.

If you get that AX15 then all you need is the adapter which is $123 from novak to adapt it to the dana 300.
I highly recommend novak, I got my T18-dana 300 adapter from them and they were very helpful, great service.
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Unread 12-27-2009, 09:17 PM   #5
TKFireman
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Lots of flat highways around here with a 70 mph speed limit, all the way from here to the beach, think the 5 speed would definitely come in handy there. 65 at around 2150 rpm, 75 at around 2300 rpm for the AX-15. That sounds better than the 65 at 2550 rpm and 75 at 2950 rpm I have now with a T176. Am I missing something, where is the power range in rpms for a stock 304? what rpm range gives the best MPG?
(RPM numbers calculated here Gear Ratio Calculator)
Anyone know if I got the AX-15, would the drive shafts work as well, seems the ax-15 is about 3" to 4" longer than my T176, then a little more for clocking ring for D300. Will the drive shafts from a mid 90's wrangler work, or can I plan on new custom drive shafts too?
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Unread 01-03-2010, 08:01 PM   #6
Boxcar
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If your 304 is bone stock you should be ok for a wile but if you have upgraded it at all an ax15 is a poor choice in trannys at best. Yes you will need new drive lines both front and rear. You may be able to use yj shafts but I am not sure. I would do a bit more resurch before you invest any $ into an ax15 to v8 swap....Boxcar
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Unread 01-03-2010, 08:07 PM   #7
NEPAjeep02
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Look into the Ford NP435. From what i've been told it is a bolt on. It has a granny low 6.69:1 ratio. Can't go wrong with that.
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Unread 01-04-2010, 07:48 AM   #8
jeepdaddy2000
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Quote:
Originally Posted by TKFireman View Post
Lots of flat highways around here with a 70 mph speed limit, all the way from here to the beach, think the 5 speed would definitely come in handy there. 65 at around 2150 rpm, 75 at around 2300 rpm for the AX-15. That sounds better than the 65 at 2550 rpm and 75 at 2950 rpm I have now with a T176. Am I missing something, where is the power range in rpms for a stock 304? what rpm range gives the best MPG?
(RPM numbers calculated here Gear Ratio Calculator)
Anyone know if I got the AX-15, would the drive shafts work as well, seems the ax-15 is about 3" to 4" longer than my T176, then a little more for clocking ring for D300. Will the drive shafts from a mid 90's wrangler work, or can I plan on new custom drive shafts too?
I think 2300@75 is going to be a bit low. The wind resistance on your CJ doubles between 55 and 70. This requires more RPM's to overcome. I would be hesitant to drop below 2500 at that speed (not that I advocate driving 75 in a CJ).
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Unread 01-04-2010, 08:24 AM   #9
twmattox
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I disagree. My Scrambler has a T-5, 3.31 ratio axles, and 31" tires. I turn around 1800 RPM at 65-70mph. It does just fine on flat areas. If I encounter a long uphill climb, or headwind (or both) I just downshift. I get exceptional mileage too (consistently 18-20).
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