Cj7 v8 - JeepForum.com
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post #1 of 11 Old 06-29-2020, 01:16 AM Thread Starter
Sjtrouble
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Cj7 v8

Howdy y'all,
I have just recently got a hold of a beautiful AMC 304 V8 from a 74 cj5. I am looking to do an engine swap on 84 cj7. My cj7 has the T5 tranny with a full stock 258 Inline 6. Is there anything I should know or be concerned about before I do a swap? (Wiring, spline output, bolting up, transmission strength etc.?)

Thanks,
John

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post #2 of 11 Old 06-29-2020, 05:10 AM
Matt1981CJ7
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There's a butt-load of info on this swap. Did you search at all?

https://www.jeepforum.com/forum/f8/o...thread-377983/

Matt


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post #3 of 11 Old 06-29-2020, 05:19 AM
LumpyGrits
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That T5 will not last behind the 304.
Find a better tranny.
Gary
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Have'n you along, is like loose'n 2 good men
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post #4 of 11 Old 06-29-2020, 10:40 AM Thread Starter
Sjtrouble
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Quote:
Originally Posted by LumpyGrits View Post
That T5 will not last behind the 304.
Find a better tranny.
Gary
so could I get away with a t4? What would you suggest?
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post #5 of 11 Old 06-29-2020, 02:05 PM
JEEPFELLER
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The aluminum trannys don't seem like they wanted to last in the CJs they came in. (Yeah, y'all can rebuttal that comment too!)

A CJ 3 or 4 speed with the case composed of cast iron from 1972-1981 would tolerate the added power.

---JEEPFELLER

Last edited by JEEPFELLER; 06-29-2020 at 02:07 PM. Reason: Info added
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post #6 of 11 Old 06-30-2020, 07:15 AM
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They do well with the T176/T177 as stock, or the older truck type boxes. The Peugeot unit and the T4/T5 are no way as strong out of the box, though I am told a T4/T5 is most at risk when offroading as the cases can flex slightly. Plenty here on the Forum who run a V8 with the T4/T5, but if I was spending the time and money I would install a stronger transmission.

That then leaves the question of where you place your new drivetrain and if that will need different length driveshafts. The T176 used the same driveshafts as the T4/T5.

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post #7 of 11 Old 06-30-2020, 07:47 AM
Matt1981CJ7
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A T-18 or T-19 (my preference) transmission are almost bomb-proof. With the necessary t-case adapter from Advanced Adapters they will also be almost the identical length of your T-5, so driveshaft lengths would remain the same.

You can get a T-19 in either 4, 5, or 6:1 1st gear ratios, so you can match it it up with your differential gearing to get a true 4-speed. You won't have overdrive, however. Some people think the T-18/19s shift like a dump truck transmission. But with the proper length shifter, I don't find my T-19 shifts any more difficult than the T176, T4-5, or SR4.

Matt


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post #8 of 11 Old 06-30-2020, 08:23 AM
OrangeCJ-5
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Something else to consider: Do you have emissions testing?
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post #9 of 11 Old 06-30-2020, 10:11 AM
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Thatís what I thought when I saw a 1974 engine going in a 1984 Jeep. But, AMC didnít use casting numbers on blocks & heads to differentiate the different years the V-8ís were being manufactured. Given that bit of info you might get away with it in a state that checks emissions as long as you install the emission components that they look for. If you are in a non emissions state, then itís all moot.

The guy I take my cars to for inspection said as long as my 1985 CJ-7 has an O2 sensor and a catalytic converter, he will pass it.

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post #10 of 11 Old 06-30-2020, 07:57 PM
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Quote:
Originally Posted by Axhammer View Post
Thatís what I thought when I saw a 1974 engine going in a 1984 Jeep. But, AMC didnít use casting numbers on blocks & heads to differentiate the different years the V-8ís were being manufactured. Given that bit of info you might get away with it in a state that checks emissions as long as you install the emission components that they look for. If you are in a non emissions state, then itís all moot.

The guy I take my cars to for inspection said as long as my 1985 CJ-7 has an O2 sensor and a catalytic converter, he will pass it.
There was no V8 option for a CJ in 1984. If the state doesnít care then it is indeed moot.
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post #11 of 11 Old 07-01-2020, 06:37 AM
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Good point, something I missed. I guess it comes down to what the state allows.

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