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Remember that a Wrangler has two drive axles, so a gear change means everything x2. And he said 35” or 37” tires, so 3.55 wouldn’t be low enough for those monster tires.
That brings up a whole new discussion about the appropriate axle gear ratios. Gear ratios for the AX15 transmission are: 3.83, 2.33, 1.44, 1.00, 0.79, so with 35” tires the axles may need close to 5.xx gears.
Yep. His crawl ratio won't be great with either gear set given the AX15 and NP231, but the 4.10 gets him closer to decent. Though, given he isn't running lockers, I doubt he's going to push this thing that hard off-road. Still, a lower crawl ratio will be a heck of a lot easier on the clutch. And you are correct, to get the crawl ratio over 50 would require 4.88+ gears.
Last edited by Bubba68CS; Apr 2, 2023 at 07:42 AM.
That brings up a whole new discussion about the appropriate axle gear ratios. Gear ratios for the AX15 transmission are: 3.83, 2.33, 1.44, 1.00, 0.79, so with 35” tires the axles may need closer to 5.xx gears.
Ooh, yeah. Forgot about that.
OP may also want to re-think the Holley double pumper.
when we find out the weight, he said it’s lite, the gear and converter, or any other mods like headers etc, then I’ll enlighten you.
is that ok?
a ford 8.8 rear would suffice. It’s not going to be a massive off-road vehicle, very minor being that I’m not touching the suspension. A 4:10 with 37s a regeared front Dana 30 and a better gearing in the np231j should also be fine. I read that the ax15 really maxes out at around 300hp and torque therefore how is the sm465 or sm420 sounding? Even a nv3550. There will be a slip yoke in it. I have to run shorty headers with it too.
should I consider a regear of my stock Dana 30 and 35 to support the weight, etc of the big tires?
Forgive me, I'm not a big off-road guy, but if you're not going to be doing any serious rock crawling and you're leaving the suspension mostly stock, do you really need or want a 37 inch tire?
Forgive me, I'm not a big off-road guy, but if you're not going to be doing any serious rock crawling and you're leaving the suspension mostly stock, do you really need or want a 37 inch tire?
there will be a plow possibly on it aswell and I like those size tires
there will be a plow possibly on it aswell and I like those size tires
The suspension can't remain stock and fit a 37" tire. It can't fit a 35" tire stock. You're looking at a 4" lift minimum (with additional body lift and/or cutting and body mods), plus all of the modifications to make your steering and driveshaft angles work, just to fit 35s. Also, putting those tire sizes on a Dana 30 or 35 is just asking for trouble. Snow plows put a ton of stress on a vehicle, and your drivetrain is going to get hammered doing that.
The suspension can't remain stock and fit a 37" tire. It can't fit a 35" tire stock. You're looking at a 4" lift minimum (with additional body lift and/or cutting and body mods), plus all of the modifications to make your steering and driveshaft angles work, just to fit 35s. Also, putting those tire sizes on a Dana 30 or 35 is just asking for trouble. Snow plows put a ton of stress on a vehicle, and your drivetrain is going to get hammered doing that.
It currently has a 4 inch lift with 31s I am going to put a body lift on it and get different axles
Yeah the AX15 will probably die behind the 300+ ft/lbs a healthy low compression Olds 350 can put out. There is a stronger version NV3500 that came behind the V8 Dakota and light duty Ram trucks. The problem is finding a BOP bell housing depending on the trans or an adapter to bolt to the Olds V8. I know some NV 3500 have the integrated bellhousing, which makes it more difficult.
Yeah the AX15 will probably die behind the 300+ ft/lbs a healthy low compression Olds 350 can put out. There is a stronger version NV3500 that came behind the V8 Dakota and light duty Ram trucks. The problem is finding a BOP bell housing depending on the trans or an adapter to bolt to the Olds V8. I know some NV 3500 have the integrated bellhousing, which makes it more difficult.
the only car an nv3500 could come out of would be a c15 for the way it was designed. How does an sm465 sound
Yeah, with the 6.5 to 1 first gear, no issue or need to swap the 4.10 gears. We had a 85 GMC 6.2 work truck with that trans, first was pretty useless for driving around town. For you, a different story.
Yeah, with the 6.5 to 1 first gear, no issue or need to swap the 4.10 gears. We had a 85 GMC 6.2 work truck with that trans, first was pretty useless for driving around town. For you, a different story.
Having never run an AX-15, honestly, looking on line, it sounds like the AX-15 is a decently strong and smoother than the NV3500. Your 350 will be decent but not putting out huge torque numbers. Depending how abusive you are, it might live a long life. Just get the right 75W90, synchronizer compatible gear oil. Do a fluid change and see how it looks. I assume there is a BOP bellhousing that will work with it?
Having never run an AX-15, honestly, looking on line, it sounds like the AX-15 is a decently strong and smoother than the NV3500. Your 350 will be decent but not putting out huge torque numbers. Depending how abusive you are, it might live a long life. Just get the right 75W90, synchronizer compatible gear oil. Do a fluid change and see how it looks. I assume there is a BOP bellhousing that will work with it?
see how knowing the details of what it’s going it makes things easier?
would anyone every have guessed in a million years it was going in that jeep? Nope
Didn't matter. Literally no one changed their recommendation after learning it was going in a Jeep. He could have said it was going in a Miata with 4.88s...cam recommendations would all be the same. With low compression and stock heads, there's only so much you can do.
I'm just a novice, I will say that first. I had a combination like this. I went with my quadrajet and a performer manifold with a 220/220 cam on I think a 106 or 107 LSA. I think it was made by Howards. The car actually ran great and had a noticeable increase in power. I think it had a 1600 converter and 2.73 gears. Just a single point of reference, but I liked that combination. Fun and simple.
the amount of times he says “I think” I think I think..when he wasn’t even thinking.
when this moron says “ I had a combination like this” without even knowing the combination the poster has, like the vehicles basic specifics, you can throw this cam recommendation out the window.
no, he never had a combination anything like this. 🤣🤣🤣🤣
Didn't matter. Literally no one changed their recommendation after learning it was going in a Jeep. He could have said it was going in a Miata with 4.88s...cam recommendations would all be the same. With low compression and stock heads, there's only so much you can do.
Nope, not even close there Bubba.
you already forgot the expert engineers recommendation?
especially now that we know the real oddball combo this motor is going in. This IS a perfect example of how NOT to pick a cam without knowing ALL the vehicle specifics
I'm no expert. I just made a suggestion based on my own experience with what I assumed a similar situation. I even stated so multiple times.
I stated my car, the equipment I had, the compression ratio I had and the cam I used. I stated every parameter for my suggestion.
I stated my car was a 1973 cutlass S, stock drivetrain, headman headers and the stock Quadrajet.
I then gave the cam that I used and stated how it worked in my car. Nothing more and nothing less.
I don't appreciate being called a fool. I can say I don't appreciate it at all. I was trying to help someone else given what has worked for me.
With that said I'm all ears. I would love to hear what cam is the winner, with maybe the reason for the various choices.
Maybe a few suggestions based on different scenarios?
All ears and eager to learn.
I am very educated. I assure you not a fool and I can also assure you that I have more than enough capacity to understand.
Am I an expert engine builder? No, as stated. I am a 30 year mechanical engineer with a Masters from MIT and a PHD in pure mathematics from Michigan State.
Please enlighten this "fool".
this “I am very educated” isn’t any where near being very educated on this topic
you can shove your MIT masters up your azz, along with your PHD in pure mathematics.
you need a lesson in humility..anytime you want to challenge me on this ,,I’m game. I’ll meet you anywhere to test your engine against mine.
heck, I’ll let you make the rules, pick the place , and whatever else you want. The loser will be crowned the “fool”
are you willing to put all that education you’re bragging about up to a little scrutiny?
There was a new flat tappet 307 Vin 9 cam on Ebay for quite cheap. Basically the same cam as the mid 70's 455. It was a mild upgrade and helped add 30 HP to a 307 over the Vin Y. The generic 204/214 cam also worked well for me in a 76 Olds 350.
Post #12
Originally Posted by Fun71
That Comp Cams grind has 218/218 @ .050" lift. While I have no experience with that particular cam, note that my UltraDyne cam has 217, but a bunch more lift. I would go with a cam that has lower .050" duration and more lift.
Cutlassefi always recommends a tighter LSA for low compression engines so it builds more cylinder pressure. So for that, one of the factory Olds camshafts such as the one olds 307 and 403 posted above would work.
The problem is you want a lopey idle and good performance, but you don't have enough compression to get both. Choose one or the other.
Post #15
Originally Posted by cutlassefi
Go with the next one down, 212/212@050 or 212/218@.050. Install it as per the supplied cam card. However your gains will be minimal anyway.
Post #30: the "expert engineer" recommending this cam:
Originally Posted by maniehau
If none of this is possible and you just have to put it together and move on then I would save some money and put in an RV cam. I would probably go even smaller than the 260/260 comp. With 7.48 compression I would most likely go with a 206/212 comp cam .443/448 lift 42-220-4 cam.
The reason I would go smaller is due to the fact that 7.48 compression might be optimistic. You might need to lean out your quadrajet as well if your putting Fel-pro gaskets on it.
Post #75 listing the specs of the quote "the expert engineer" recommended.
Originally Posted by Fun71
I looked up the specs and I agree, that appears to be a good cam for your application.
Post 99: You agreeing with the choice the "expert engineer" made way back on post #30:
Originally Posted by CANADIANOLDS
good choice.
see how knowing the details of what it’s going it makes things easier?
would anyone every have guessed in a million years it was going in that jeep? Nope
Originally Posted by CANADIANOLDS
Nope, not even close there Bubba.
you already forgot the expert engineers recommendation?
As I said, no one changed their recommendation after finding out it is going in a Jeep. None of that is in the least bit relevant given the compression and airflow potential of that engine. He had plenty of great recommendations on page 1 of this thread, before you showed up berating everyone for not considering what are ultimately irrelevant details. Then you sit here and berate the guy who chose the very cam you think works well in this application??? You win the internet today...
