SBC swap questions - JeepForum.com
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post #1 of 74 Old 04-10-2011, 06:35 AM Thread Starter
hesserdude07
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1993 YJ Wrangler 
 
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SBC swap questions

ok well since blowing up my little 2.5 yesterday and still having a 350 on my garage floor. Its time to swap.... (number 3 connecting rod out the bottom doing about 65 down the high way)

1. What are you guys running for trannys? (i wanna be able to use my 231 SYE) I know ill have to redo all my drive shafts but thats fine.

2. Where is a bulk head pin out diagram for wiring?

3. Any other help?? This is going to be a quick swap...

(i already ordered Novak adaptor motor mounts, got my SYE already, and have an ebay sbc jeep swap radiator coming)


1993 Silver YJ. SBC 300hp. 700r4. NP231 hybrid. 35" Mud Terrains. 7" Toyota Basterd packs. 8.8 Welded. D30 loc-rite. 1" body lift. 4" LED tails. Custom bumpers. Warn M8000. Hella's. (Trail rig)
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post #2 of 74 Old 04-10-2011, 07:22 AM
kcaverly
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I run a 4l60 in mine. I like it because it has overdrive. I don't like it because it's automatic. At the same time though, the auto is nice on the trails.

If you use the 4l60 (or 700r4, same tranny just a name change) you can use a chevy np231 front half, and the jeep np231 rear half to make a hybrid heavy duty transfer case and use your SYE.

I think you'd be crazy to go without OD on any vehicle that sees the highway, though lots of people do.

Kevin

1993 Jeep YJ - 350 Chevy TBI, SM465, NP241, 14B SF LSD, 10B
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post #3 of 74 Old 04-10-2011, 07:35 AM Thread Starter
hesserdude07
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thanks for the quick reply. I dont drive mine only to trail and back home... But i have been looking into a 700r4 but not much good said about em.
But even with a th350 or 400, i run 4.10 gears, and 35s i should still only be like 2000rpms at 65ish... And i want the auto cause its a quck swap and less money. No clutch to buy and deal with.... Dont have that kinda time right now or money.

1993 Silver YJ. SBC 300hp. 700r4. NP231 hybrid. 35" Mud Terrains. 7" Toyota Basterd packs. 8.8 Welded. D30 loc-rite. 1" body lift. 4" LED tails. Custom bumpers. Warn M8000. Hella's. (Trail rig)
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post #4 of 74 Old 04-10-2011, 08:36 AM
Dryseals
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The 700r4 is a good solid transmission. They got a bad rap from the early production models, they had some weak points that were later identified and upgraded in the later models. Any decent transmission shop knows which models to avoid or they can do the upgrades during a rebuild.
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post #5 of 74 Old 04-10-2011, 12:58 PM Thread Starter
hesserdude07
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well thats good to know. I will get my motor up on the stand tomorrow and recheck everything. Probley put a new timing set in it and maybe a gasket kit... Still looking for a tranny/T case

1993 Silver YJ. SBC 300hp. 700r4. NP231 hybrid. 35" Mud Terrains. 7" Toyota Basterd packs. 8.8 Welded. D30 loc-rite. 1" body lift. 4" LED tails. Custom bumpers. Warn M8000. Hella's. (Trail rig)
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post #6 of 74 Old 04-10-2011, 02:23 PM
dobslob
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I loved the difference when I swapped from my turbo 350 to the 4l60. Better on the trail and on the road. It seems to be holding up quite well to the power of my small block. Definitely strong enough and the extra gear makes it a great step from the 350.
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post #7 of 74 Old 04-10-2011, 03:49 PM
wordo30
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im running the stock ax-15 its held up pretty well behind the 350 as long as you go easy on the skinny pedal. i have plans to swap out the ax-15 later but its what was in my budget when i had first put the engine in.
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post #8 of 74 Old 04-10-2011, 05:40 PM Thread Starter
hesserdude07
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Quote:
Originally Posted by wordo30 View Post
im running the stock ax-15 its held up pretty well behind the 350 as long as you go easy on the skinny pedal. i have plans to swap out the ax-15 later but its what was in my budget when i had first put the engine in.
yeah ive heard of alot of ppl doing that, but since i had a 2.5 with a JUNK AX5 im going with a chevy tranny... and hybrid 231 transfer case.

1993 Silver YJ. SBC 300hp. 700r4. NP231 hybrid. 35" Mud Terrains. 7" Toyota Basterd packs. 8.8 Welded. D30 loc-rite. 1" body lift. 4" LED tails. Custom bumpers. Warn M8000. Hella's. (Trail rig)
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post #9 of 74 Old 04-10-2011, 05:44 PM Thread Starter
hesserdude07
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Quote:
Originally Posted by dobslob View Post
I loved the difference when I swapped from my turbo 350 to the 4l60. Better on the trail and on the road. It seems to be holding up quite well to the power of my small block. Definitely strong enough and the extra gear makes it a great step from the 350.
I wish i had the cash right now to do that too, but with just buying a house its gonna have to wait. And im quite a way from any speed limit over 35, so im not worried about that over drive. And the farthest my jeep going to play when driven is an hour, and then is only 55mph since we dont do highways.



How are you on room with the 4l60? (like rear drive shaft and such) And what t-case are you running with it? they are quite long and Heavy.

1993 Silver YJ. SBC 300hp. 700r4. NP231 hybrid. 35" Mud Terrains. 7" Toyota Basterd packs. 8.8 Welded. D30 loc-rite. 1" body lift. 4" LED tails. Custom bumpers. Warn M8000. Hella's. (Trail rig)
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post #10 of 74 Old 04-10-2011, 06:43 PM
kcaverly
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With my 4l60 and np207c I am 42.5" from tranny bellhousing to TC tailstock. Another member here measured his th350 and np231 to be 42". I'm not sure how individual component lengths compare, but our total length is pretty similar.

To get a strong 700r4/4L60 you just have to get a "K" case. They are from the chevy 4x4 trucks, and literally have a large K on the side of the case. They are all post '87 (when the improvements happened) and I believe have some heavier duty stuff in em.

My rear drive shaft is actually stock, unmodified. The overall length of the driveline is pretty close to a 2.5+ax-5+np231j. My front drive shaft I shortened a bit, but now with a 4" lift its a hair short.

Also, install your motor high, this allows you to tilt it down to the transfer case, and gives you much reduced driveline angles. My motor is installed so it just fits under the hood, and with a 4" lift I have a better rear shaft angle than it did stock.

A 700r4 shouldn't cost you much (if any) extra over a th350. There's millions of them in junkyards in perfectly good operating condition.

Kevin

1993 Jeep YJ - 350 Chevy TBI, SM465, NP241, 14B SF LSD, 10B
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post #11 of 74 Old 04-11-2011, 10:40 AM Thread Starter
hesserdude07
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Kevin thanks for all the replys..... Still no luck on a tranny. everyone wants to sell me a 4l60e and some wack t-case. So i dont know...

WHAT A DAY. So i get to work this morning and some one had smashed my slider top window and stole all my **** inside. two 4"x30' straps, 7' tree saver, 4 D-rings, and my tool bag. Just Awesome way to start my monday...

1993 Silver YJ. SBC 300hp. 700r4. NP231 hybrid. 35" Mud Terrains. 7" Toyota Basterd packs. 8.8 Welded. D30 loc-rite. 1" body lift. 4" LED tails. Custom bumpers. Warn M8000. Hella's. (Trail rig)
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post #12 of 74 Old 04-11-2011, 10:59 AM
spartan717
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If you're having it rebuilt any transmission shop, they can switch 2wd to 4wd. When I rebuild 700r4's I perform all updates and so do most shops I know. 700R4 would be the only auto I would use. Avoid pre-87's. The internals are all the same, but the control assemblies are better. I'd look for a junk 88-92 Chevy. It'd have everything you need and you could probably pick it up cheaper than buying parts.

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post #13 of 74 Old 04-11-2011, 11:04 AM
fourgazum
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i am in the first stages of swapping in a 79 sbc 350 in my 93 yj it had the 2.5 as well. i have a np231 23 spline tcase with the adaptor to fit my 1986 700r4 i am not sure what headers i need to use yet. looks like your getting some good info here i will keep up with your build and maybe learn some tricks along the way. if you find any great advice pass it on and i will do the same.
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post #14 of 74 Old 04-11-2011, 06:35 PM Thread Starter
hesserdude07
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Quote:
Originally Posted by fourgazum View Post
i am in the first stages of swapping in a 79 sbc 350 in my 93 yj it had the 2.5 as well. i have a np231 23 spline tcase with the adaptor to fit my 1986 700r4 i am not sure what headers i need to use yet. looks like your getting some good info here i will keep up with your build and maybe learn some tricks along the way. if you find any great advice pass it on and i will do the same.
Thats the same motor i gots 79 350 outta my old K20... Now if i could only find a tranny and tcase local GOD they are hard to find now.

1993 Silver YJ. SBC 300hp. 700r4. NP231 hybrid. 35" Mud Terrains. 7" Toyota Basterd packs. 8.8 Welded. D30 loc-rite. 1" body lift. 4" LED tails. Custom bumpers. Warn M8000. Hella's. (Trail rig)
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post #15 of 74 Old 04-11-2011, 07:21 PM
captainauti
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i did a 4.3 swap, but very similar. i used the 4l60e and the np231c/j hybrid. stock drive shafts, front and rear. love the setup. good luck.

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