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Old 08-19-2011, 06:34 PM   #1
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need help motor option?

Hello forum, I'm a high school student building my 1st cj7 from the ground up the build sheet is in my signature so if you like check it out. i love it.

I have a 258 block ( original matching numbers ) and a t-177 transmission matted to a dana 300.

My question is what motor options do i have. what motors can i use? with out buying another transmission and t-case.

thank you very much take care.

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Old 08-19-2011, 11:12 PM   #2
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Hey fella, great to see a young fella getting into this at a young age! For the record, if thats a 4 speed, its a t-176. Not real important aside from not looking like an ass when talking shop, haha. Anyway, in my opinion the 258 is the best motor ever made for a cj, aside from the dauntless V-6. Do a mild performance rebuild on that 6 with a larger cam, offy intake and header, dui hei distributer and a holley 470 truck avenger or motocraft 2100 carb and that little 6 will come alive. This is one of a few fairly proven recipes for waking up that 258.

With that said, the perfect tranny for a jeep is one with a compound low such as a t18, sm465/420, or a np465.

Back to the motor, if you are looking for a V8, 350 chevy and 304/360/401 amc motors are the most common and parts are fairly easy to come by. With the longer wheelbase of a cj7, you can handle a few more horses and still maintain stability, but I still maintain that 6 is the best motor ever put in a cj. It just needs to be woken up!

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Old 08-20-2011, 09:14 AM   #3
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The T177 is the truck version of the T176. Yes you could have a T177 but it wouldn't be from a CJ because it has a long input shaft! The truck has a spacer between the bellhousing and the trany. With this added length, they are able to swap from auto's to sticks without changing drivelines or cross member locations.
The T177 has a lower first gear! No short inputs are available but you could use one in a CJ.
A T176/177 is a Ford transmission. If you went to a Ford 302 or 351, You could use the Ford bell housing and it will bolt up to the Tremec T176/177 transmission. You would need a adapter for a Chev conversion. I am a believer in the 4.3 Chev V6 but if you can find a 5.0 Fuel injected cheeper in a lot of areas.
A Buick V6 225 is also going to require a adapter unless you find a T18 setup but then you will find it with a D20 transfer. Keep the D300!
If you are willing to go with a $500.00 dollar adapter. Then A Chev engine and a Chev truck 4 speed would be the way to go and buy a adapter to keep your D300 transfercase!
AMC engines are heavy, costly to build and repair and although there are good EFI kits you can get! By the time you purchase a Howell EFI you can swap in a Ford or Chev engine and get more for your money!
I have run many AMC and Buick engines. And have a 258 in my current 84 CJ7 that I am waiting to go TU.
Novak is full of lots of info! If you have time and patience to dig threw!
http://www.novak-adapt.com/knowledge..._cj7_80-86.htm
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Old 09-11-2011, 02:03 PM   #4
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i have a friend that totaled his fox body mustang he's willing to sell me the 5.0 should i take it he'll give it to me cheap. ( got cliped my a truck sent him spinning across the intercestion and ate a traffic light on the rear passenger 1/4 pannel) engine is in tacted and still starts up. should it.? Im looking forward for some advice / guidence from you guys for this build because clearly you guys have more knowledge in this than i do. when it comes to tj's i know my share of info. should i get the 5.0 from the mustang?
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Old 09-11-2011, 02:24 PM   #5
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Interesting. I have seen ford engines in jeeps but unsure on the adapters availability. A efi 5.0 would be a sweet option in a jeep.
Is the engine stock or modified? I have owned 4 foxbody mustangs so pretty knowledgeable on them.

You can't run the tranny that is in the car so you would have to get a ford truck setup I guess.
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Old 09-12-2011, 05:22 PM   #6
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Would the ford 5.0 with a T5 tranny work? Or do the jeep T5s have a different setup?
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Old 09-12-2011, 08:40 PM   #7
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Quote:
Originally Posted by Cj7otr
Would the ford 5.0 with a T5 tranny work? Or do the jeep T5s have a different setup?
The mustang t5 will not mate to a transfer case. Now will a jeep t5 bolt to a 5.0? I'm sure you would have to change the input shaft.
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Old 09-12-2011, 09:08 PM   #8
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according to novak adapters, the 5.0 will directly bot up to the t-176

more infoInstalling Ford V8 Engines in the Jeep CJ, 1980-1986
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Old 09-12-2011, 10:28 PM   #9
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Quote:
Originally Posted by PaulRevere1991
according to novak adapters, the 5.0 will directly bot up to the t-176

more infoInstalling Ford V8 Engines in the Jeep CJ, 1980-1986
Good info to know.
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Old 10-02-2011, 12:10 PM   #10
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Change the bellhousing and go up to a AMC 304 or Ford 260, 289, or 302 They all bolt up the same to the Bell.

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