Chevy 350 and Muncie SM465 Trans into a YJ...your thoughts? - JeepForum.com

 
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post #1 of 14 Old 01-29-2010, 12:09 AM Thread Starter
jesseleikerjeep
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Chevy 350 and Muncie SM465 Trans into a YJ...your thoughts?

Hey guys/gals:

I am just in the process of deciding to swap out horses. I don't have enough of them rattling around in my engine bay and I'm kind of a hill billy...which means my anemic I4 isn't loud or quite obnoxious enough. I would like some opinions, however.

For now: I'm intending on leaving the NP231 tcase in tact...and throwing a 5.7L 350 v8 in there with a Muncie SM465 transmission to compliment it. This tranny is a good pairing both for the 350 and the 231. Anyone have any better ideas? Thoughts...suggestions...anything will help! I'm in no hurry as this is about project number 8 on my "projects that will take a while and I'm having a hard time finding motivation to start any of them, but probably should because my Jeep is a pos" list.

I appreciate it! Thanks!

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post #2 of 14 Old 01-29-2010, 03:23 AM
jsawduste
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People do it all the time
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post #3 of 14 Old 01-29-2010, 08:37 AM Thread Starter
jesseleikerjeep
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Lol. Well thank you jsaw. I myself have put plenty of 350/Muncie combo's in...Chevy's. Just never in a Jeep. I don't know if the 465 marries up with the np231 as nicely as I think it will...I'm just wondering if anyone has placed this particular combination in their YJ yet...if there were any inherent problems that I'd rather know about now....
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post #4 of 14 Old 01-29-2010, 10:22 AM
jsawduste
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Quote:
Originally Posted by jesseleikerjeep View Post
Lol. Well thank you jsaw. I myself have put plenty of 350/Muncie combo's in...Chevy's. Just never in a Jeep. I don't know if the 465 marries up with the np231 as nicely as I think it will...I'm just wondering if anyone has placed this particular combination in their YJ yet...if there were any inherent problems that I'd rather know about now....
Both Novak and Advance have writ up`s on this swap. It might be a good idea to Google them and check it out.
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post #5 of 14 Old 01-29-2010, 10:25 AM Thread Starter
jesseleikerjeep
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Cool. Will do. I am checking out Novak's now.
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post #6 of 14 Old 01-10-2016, 02:18 PM
bobs409
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An old thread but I'm thinking of going the same route, wonder if you ever went ahead with this combo?
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post #7 of 14 Old 01-10-2016, 09:45 PM
mattsez
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i can hear your axles breaking from here..................stock?
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post #8 of 14 Old 01-11-2016, 07:12 AM
vadslram
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It has been done before but in my grossly inflated and in no way humble opinion that is a lot of extra weight too far forward on our little beasts.
I personally like the Cummins 4 cyl swap because although it is also a lot of weight it sits further back on the mounts and keeps the weight better centered.
If you go ahead and do the swap consider getting custom motor mounts and have the drive shafts set up so that you don't have ~80% of the vehicle weight on top of the front axle.
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post #9 of 14 Old 01-11-2016, 12:12 PM
Yarz
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The 350/SM465/NP231J works well for me, and a few others I've read on this board

"Build a man a fire, and he'll be warm for a day. Set a man on fire, and he'll be warm for the rest of his life."

1990 White YJ TBI350, SM465, NP231, SOA, RE 1.5" SOA springs, Ford 8.8, D30, 4.10's, JBConversions SYE, XJ shaft, Bilstein 5150s, jb4x4 steering, MORE SS brakelines, 35x12.50 15 MT's, '95 YJ Brake Booster, '78 Grand Marquis MC, ZJ Prop. Valve
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post #10 of 14 Old 01-12-2016, 09:28 AM
bobs409
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Gotta go Chevy, it's in my blood. I would go with Novak mounts and other needed parts.

I'm not tough on my vehicles but if the axles don't survive, I'll deal with that later.

Now I'm just wondering about some small details like;

Can I use mechanical clutch linkage? (is there room for it)
If so, can I attach to existing clutch pedal?

What about accelerator? Thinking something 70/80's GM cable type could bolt in or even go older mechanical linkage type. ??

Oil filter... I heard a remote type might be needed due to no room?

I know this combo has been done and that I can make it happen. The one thing I'm a bit uneasy about is the smog stuff. In my county of PA, they don't do a sniffer test, supposedly just a visual to see that the junk is there. Guess I can make it look all functional.

Would love to find a detailed build thread with this combo. Anything out there???
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post #11 of 14 Old 01-12-2016, 04:04 PM
Yarz
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Added some responses in GREEN

Quote:
Originally Posted by bobs409 View Post
Gotta go Chevy, it's in my blood. I would go with Novak mounts and other needed parts.

I'm not tough on my vehicles but if the axles don't survive, I'll deal with that later.

Now I'm just wondering about some small details like;

Can I use mechanical clutch linkage? (is there room for it)
If so, can I attach to existing clutch pedal?

Don't know.. I used Novak's hydraulic slave and Jeep master

What about accelerator? Thinking something 70/80's GM cable type could bolt in or even go older mechanical linkage type. ??

I used the Jeep pedal

Oil filter... I heard a remote type might be needed due to no room?

I didn't need to use a remote one

I know this combo has been done and that I can make it happen. The one thing I'm a bit uneasy about is the smog stuff. In my county of PA, they don't do a sniffer test, supposedly just a visual to see that the junk is there. Guess I can make it look all functional.

Would love to find a detailed build thread with this combo. Anything out there???
Here's a few threads to get your reading started:
http://www.jeepforum.com/forum/f12/8...emons-1276338/
http://www.jeepforum.com/forum/f12/3...-swap-2619914/
http://www.jeepforum.com/forum/f12/3...-near-1406658/
http://www.jeepforum.com/forum/f12/my-350-swap-518364/
http://www.jeepforum.com/forum/f22/m...udget-1164650/


As always, your results may vary, depending on model year changes/etc. but if after reading up on it, you have more questions or want to see pictures of how certain parts fit, feel free to ask

"Build a man a fire, and he'll be warm for a day. Set a man on fire, and he'll be warm for the rest of his life."

1990 White YJ TBI350, SM465, NP231, SOA, RE 1.5" SOA springs, Ford 8.8, D30, 4.10's, JBConversions SYE, XJ shaft, Bilstein 5150s, jb4x4 steering, MORE SS brakelines, 35x12.50 15 MT's, '95 YJ Brake Booster, '78 Grand Marquis MC, ZJ Prop. Valve
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post #12 of 14 Old 01-13-2016, 09:09 AM
bobs409
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Thanks. I'll check those out.
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post #13 of 14 Old 01-17-2016, 07:48 PM
Flajeeper1
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I just went with a 5.3 (gm 327) with the 4l60e tranny. Added a GM hot cam and tuned the ecm. approx. 400hp. Novak trans to transfer case kit (added about 3") and a JB Conversions super short sye with 1350 plate for driveshaft. B&M shifter. Whoa, what a jump from a 4.2 jeep engine! Novak also has motor mounts if you dont want to fab your own. I resisted an auto tranny for along time but glad I did it. Go for it!
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post #14 of 14 Old 01-17-2016, 08:42 PM
cyoos
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Quote:
Originally Posted by jesseleikerjeep View Post
For now: I'm intending on leaving the NP231 tcase in tact...and throwing a 5.7L 350 v8 in there with a Muncie SM465 transmission to compliment it.
I likeee! I likeee whole lot!!!
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