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Old 11-17-2016, 08:46 PM
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swap to 350 chevy. Should I use ax-15 transmission?

Is there any downsides to using factory ax-15 transmission with novac adapter on 350 swap? Seems like it would be easiest and cheapest. Also the transmission and transfer case are freshly overhauled.
I don't plan on doing any rock crawling or anything.

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Old 11-19-2016, 12:24 PM   #2
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If you enjoy driving a manual, I see no reason not to. It will hold up very well so long as you're not over 350 lbs/ft torque

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Old 11-20-2016, 12:16 AM   #3
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Novak conversions says it works well behind SBC's as well as Gen 3 small blocks such as 5.3 vortecs. And the AX15 is actually a pretty popular swap into the Magnum powered Grand Cherokees. If it's a stock 350 I'd say you'd be fine.
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Old 11-21-2016, 01:10 PM   #4
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Should work well with stock HP. What's your plans with the jeep If your building something to crawl and not see much highway speeds look into the SM420 or SM465 if four looking for something that will see highway speeds look into the NV4500.

All these will bolt right to your Chevy engine without an adapter but you will need to adapt to the T-case
Check out this link. https://www.novak-adapt.com/knowledg...issions/manual
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Old 11-21-2016, 03:58 PM   #5
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Originally Posted by jeeptank91 View Post
Should work well with stock HP. What's your plans with the jeep If your building something to crawl and not see much highway speeds look into the SM420 or SM465 if four looking for something that will see highway speeds look into the NV4500.

All these will bolt right to your Chevy engine without an adapter but you will need to adapt to the T-case
Check out this link. https://www.novak-adapt.com/knowledg...issions/manual
Manuals suck for crawling, if it's built to crawl a th400 would be much better suited for that purpose.
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Build Thread 1989 YJ, Chevy 355 TBI, 700r4, np231 sye/wide chain/6 pinion planetary, D30/8.8/4.56, 33" A/T's, bds 3.5" springs, 1" Boom Shackles, crossover heim steering
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Old 11-26-2016, 09:29 PM   #6
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The only people i see saying manuals suck for off road/crawling...are people who suck at driving manuals. It is ether learn how to drive a stick well or find a good auto transmission shop to rebuild your burnt trannies every 2 years.
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Old 11-26-2016, 09:33 PM   #7
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Originally Posted by jeeptank91 View Post
Should work well with stock HP. What's your plans with the jeep If your building something to crawl and not see much highway speeds look into the SM420 or SM465 if four looking for something that will see highway speeds look into the NV4500.

All these will bolt right to your Chevy engine without an adapter but you will need to adapt to the T-case
Check out this link. https://www.novak-adapt.com/knowledg...issions/manual
I agree to choose a diff manual. Your 350 might be bone stock now...but in 6 years you might want a built stroker with blower...ax15 will never handle that. But many other manuals will.
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Old 11-26-2016, 09:42 PM   #8
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The only people i see saying manuals suck for off road/crawling...are people who suck at driving manuals. It is ether learn how to drive a stick well or find a good auto transmission shop to rebuild your burnt trannies every 2 years.
I'm very good at a manual but when a manual isn't geared low enough, it is no fun to play on rocks ie: an ax15. That's why all the guys who wheel manuals run doubler transfer case or super low range cases like an atlas with 5:1 low range. I tossed around the idea of running a sm420 or 465 and even have a np435 sitting in my garage. Driving as many different rigs as I have, an automatic is the best for rock crawling period and many people who have wheeled both agree. When you burn out the clutch crawling or a slave blows on the trail, you're whole weekend is shot. Running part clutch so you don't stall is never good and I watch "people who" don't suck driving manuals stall still. I'm a gear guy and rebuild transmissions, differentials and everything else with gears so the wear is not the problem. Automatics also give you a better crawl ratio because of the torque converter allowing you to go slower at higher rpms. A quick question for who because you obviously have soo much experience rock crawling; why do competition rock crawlers all drive automatics?
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Old 11-26-2016, 10:55 PM   #9
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We are talking about street legal jeeps...weekend warriors..not purpose built, off road only KOH style rigs here. If you wanna think your weekend warrior is more bad ass and like a Competition crawler because it has an auto... be my guest. And all the mumbojumbo about running doublers and low gears....has nothing to do with manual vs auto. Everyone who wheels hard puts lower gears in there rig, auto or manual. If auto's were so much better there wouldn't be a rubi crawler box, or a forum full of auto jeeps with lower gears and doublers.

In the end the OP said he wanted to know if his MANUAL transmission would hold up. Not if he should go auto, because real rock crawlers run autos and in your opinion they are the greatest thing since sliced bread....
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Old 11-27-2016, 12:25 AM   #10
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We are talking about street legal jeeps...weekend warriors..not purpose built, off road only KOH style rigs here. If you wanna think your weekend warrior is more bad ass and like a Competition crawler because it has an auto... be my guest. And all the mumbojumbo about running doublers and low gears....has nothing to do with manual vs auto. Everyone who wheels hard puts lower gears in there rig, auto or manual. If auto's were so much better there wouldn't be a rubi crawler box, or a forum full of auto jeeps with lower gears and doublers.

In the end the OP said he wanted to know if his MANUAL transmission would hold up. Not if he should go auto, because real rock crawlers run autos and in your opinion they are the greatest thing since sliced bread....
First of all the benefit to the rubi crawler box is to use a 2.72:1 low range and not just the 4:1 behind rubicons. 2.72:1 is a good low range for most offroad situations like mud, sand and snow and 4:1 is good for crawling. Putting those two both in low range would net a 10.88:1 low range and the brakes couldn't hold the vehicle stopped. I've come across 2 people that have had them and they never used the low range of both except for testing.

As for the original intent of this post, I told him it would hold up fine and yes there is a guy in my club who runs one without problem behind his mildly built 350, but your dumb comment about manuals being so much better than automatics for offroading is a bunch of BS. Go on a forum like Pirate 4x4 to see how many people who really offroad enjoy manuals (not many). The only benefit to a manual transmission for offroad vehicles is compression braking (easily done with an auto too) and the ability to bump start so long as your not electric fuel injected with strange sensors. I love manuals and have wheeled my jeep hard with one for 5 years but after having to replace the clutch as many times as I have, I'm done. I have a 69 firebird with a TKO 600 manual so I'll still get to enjoy one for a street vehicle.
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Old 11-28-2016, 09:25 PM   #11
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Well, Well! Someone else likes Auto Trans, and Thinks of the Mechanical Advantage of running one! They are this Best Going in the Gumbo Mud Down Here! Thank You Sir. Yes I have Ran Both Hard, even behind a Big Block 1978 Chevy 4X4, and after 47 Years of Off Roading I will only run an Auto Trans.. Yes Your AX15 Will Do Good behind a Stock 300HP and 350 TQ Engine if You Don't Just Dog It all the time!
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Old 11-28-2016, 10:39 PM   #12
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Well, Well! Someone else likes Auto Trans, and Thinks of the Mechanical Advantage of running one! They are this Best Going in the Gumbo Mud Down Here! Thank You Sir. Yes I have Ran Both Hard, even behind a Big Block 1978 Chevy 4X4, and after 47 Years of Off Roading I will only run an Auto Trans.. Yes Your AX15 Will Do Good behind a Stock 300HP and 350 TQ Engine if You Don't Just Dog It all the time!
I had a 79 k20 that came with a 400ci engine and sm465 and it was awful to drive because of how slow you had to shift the transmission, not smooth like the ax15 for example. The gearing span was awful and you'd lose too much rpms between shifts and it would take a while to gain power again. Towing was absolutely horrible and don't get me started on boat launching. Swapped in a th400 and it was a much more enjoyable truck. I've only enjoyed driving manuals in sporty on road vehicles, but living in traffic filled California even that isn't enjoyable....
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Old 11-29-2016, 09:21 PM   #13
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I had a 79 k20 that came with a 400ci engine and sm465 and it was awful to drive because of how slow you had to shift the transmission, not smooth like the ax15 for example. The gearing span was awful and you'd lose too much rpms between shifts and it would take a while to gain power again. Towing was absolutely horrible and don't get me started on boat launching. Swapped in a th400 and it was a much more enjoyable truck. I've only enjoyed driving manuals in sporty on road vehicles, but living in traffic filled California even that isn't enjoyable....
LOL, No mine was a K10 with 1971 Chevelle Junk Yard 'rebuilt' 454 with a NP? {i don't remember the number} Granny low 4 speed, and was a very powerful truck, but I hated it off road and the very little I drove it in town in stop and go was a nightmare. I replaced it with a 1980 K10 with a 350 and a turbo 350 and have ran Auto's from then on. Oh I did have an old 78 Bronco, back in 1993, 4 speed NP with a 400 CID, I just Gave it to my step son to get it out the yard and make wheels for him.

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