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Old 01-27-2007, 06:47 PM   #1 (permalink)
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tranny options for the 2.5

I am planning on puting together a buggy with my old yj's 2.5L. I was wondering what tranny options are out there. I don't mean the stock options, I want to know what adapters are made. I was thinking about a turbo 350, but couldn't find anyone that made an adapter. I tried to look up some info on AAs site, but couldn't really find anything. What are my options and where do I go for more info?
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Old 01-27-2007, 11:40 PM   #2 (permalink)
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2.5 had an auto opt. it was a 904 you should be able to get one from a tj or a yj i will have a 21 spline out put witch limits your t case opt.
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Old 01-28-2007, 04:17 AM   #3 (permalink)
 
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If you're interested, you can go with a SM465 or SM 420. I've contacted http://novak-adapt.com/ when I was researching this for myself. It's not a cheap option, and the t-case input shaft has to be changed, but that's the easy part.

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Old 01-28-2007, 07:01 PM   #4 (permalink)
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If novak makes an adapter for a sm420/65, then wouldn't it be a close swap for a th350/400? I didn't see either on their site though. Just for the bigger amc engines and 4.0. Isn't the 2.5 a different bell housing than the 4.0? Has anyone put other than stock trannys behind their 2.5? I do like the sm420 option though. Thanks for the heads up willness. One other question, those of you that may have autos behind your 4banger... is it hell or will a deep set of case gears or axles make up for it enough to be responsive offroad? I would like to stay auto for the build to keep my wife interested, but if it isn't going to get the job done then I'll have to go with a 4spd. I realize I'm not going to have "power", I just want to know if I can make it "quick" with the right gears and not go so low that I never get above 40mph. Thanks for the input.

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Old 01-28-2007, 09:00 PM   #5 (permalink)
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I'm not sure about automatic upgrades. But you can use a nv3550 or ax15 behind the 2.5L using a 96-98 dodge dakota 2.5L bellhousing and a specific camaro clutch and a few other random parts. There was a good thread on this site somewhere awhile ago, but i can't search (i guess b/c i'm a newb ). I have a 5spd so i havn't looked much into auto set-ups Depending on how big you are looking at going, the poor little 2.5L isn't going to have enough power to get you to highway speeds.

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Old 01-29-2007, 03:35 AM   #6 (permalink)
 
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That thread is here:https://www.pirate4x4.com/forum/showthread.php?t=181361
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Old 01-29-2007, 03:37 AM   #7 (permalink)
 
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Quote:
Originally Posted by CAVE View Post
If novak makes an adapter for a sm420/65, then wouldn't it be a close swap for a th350/400? I didn't see either on their site though. Just for the bigger amc engines and 4.0. Isn't the 2.5 a different bell housing than the 4.0? Has anyone put other than stock trannys behind their 2.5? I do like the sm420 option though. Thanks for the heads up willness. One other question, those of you that may have autos behind your 4banger... is it hell or will a deep set of case gears or axles make up for it enough to be responsive offroad? I would like to stay auto for the build to keep my wife interested, but if it isn't going to get the job done then I'll have to go with a 4spd. I realize I'm not going to have "power", I just want to know if I can make it "quick" with the right gears and not go so low that I never get above 40mph. Thanks for the input.
Just shoot Novak an E-mail with your concerns. They'll be more than willing to help you out.
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Old 01-29-2007, 05:06 AM   #8 (permalink)
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Use a 700R4 from a 2.8L V6 Blazer. Has the same bolt pattern.
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Old 01-29-2007, 08:21 PM   #9 (permalink)
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yes

700R4, now we are talking. I don't know why I didn't think of that. Is that a computer controlled tranny? A np231 should bolt to that too right? Thanks for the info.
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Old 01-29-2007, 08:32 PM   #10 (permalink)
 
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The 2.5 will be a turd on power behind any auto, especially the 700R4. The factory 904 auto is really the best option if you have to have an auto.
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Old 01-30-2007, 12:43 PM   #11 (permalink)
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The 2.5l 4cyl and the 2.8l v6 had the same 60* gm bolt pattern, I know that my buddy here at work has a 2.8l v6 in his Izusu trooper with an auto behind it. I haven't been able to identify the tranny yet, but the Izusu Boards might have some input aswell.
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