need advice! CJ engine/trans swap or build? - JeepForum.com

 
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post #1 of 7 Old 10-07-2003, 10:13 PM Thread Starter
jcberm
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need advice! CJ engine/trans swap or build?

ok, I have an 81 CJ 7 304 v8 auto trans w/ 1 piece moser in amc20 I do moderate wheeling, mostly desert sand or mountain trails. Here is my delima. My motor needs to be rebuilt so does carb, trans is slipping. I am thinking of swapping in a 258 w/ t55 tranny. I used to have a cj8 w/ that combo and it worked fine for me. Not sure how much horsepower I'm going to give up because the v8 never ran strong since I've had the jeep
.(bad rings)
Does any one have any suggestions, thoughts, Ideas Diiferent motor/trans thoughts for me?
oh yeah, running 33's w/ 3.73's Also looking at a locker in front d30. Thanx in advance!!!

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post #2 of 7 Old 10-08-2003, 07:00 AM
Scrambler82
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I would keep the V-8, change over to EFI, and if auto replace the trans with a five speed, or just rebuild/replace the auto.

OK so I am a V-8 fan, The six is a good engine, if it is in good condition with a trans I guess it would be a viable solution.

Luck,

Scrambler82

Do it right the first time !
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post #3 of 7 Old 10-08-2003, 11:16 AM
kjc2260
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I agree with NnF on keeping the V8. I have the same engine in my '77 that I'm in the process of rebuilding. As far as power goes, here are the specs-1971-1990 258 150 hp@3800rpm, Torque 240 lb. ft.@1800 rpm vs. 1972-1991 AMC V8 150 hp @4200 rpm, torque 245 lb. ft. @2500 rpm. As you can see, they're pretty close and these are stock numbers. I'm just a V8 guy. If you decide to rebuild your V8, I have a brand new 2bl carb I'll sell you cheap. Also, as far as cost, I think you would come out better by fixing what you have and for sure a lot less hassle. Just my 2 cents worth. Good luck.
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post #4 of 7 Old 10-08-2003, 10:45 PM
eight
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I'd keep the V-8 and the auto. The auto and the high geared T176 were the only strong trannys put in jeeps with the d300 t-case. A 304/tf999/d300 sounds like the start of a good drive train to me.
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post #5 of 7 Old 04-19-2016, 03:55 PM
Deadmanshouse
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Yes, you should try to rebuild the v8 and do some 4x wheeling at the behind the Fairways in PS.
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post #6 of 7 Old 04-19-2016, 11:14 PM
AllenForaker
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If you think your drive train has all of these issues, start with just one of them. Do a pressure check on each cylinder first, if they are withing spec, then go to step 2. A carburetor rebuild is much cheaper than replacing an engine/transmission, cheap and easy. If the last two items check out and you still think its the transmission, drop it and take it to a respectable service center and let them inspect/repair as needed, still cheaper than replacing the whole power train. With patient/diligent diagnosis, you can find where the problem lies without changing your whole power train. A V-8 w/automatic is a great combination for wheeling, try to keep what you have.
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post #7 of 7 Old 04-20-2016, 02:41 PM
Matt1981CJ7
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Quote:
Originally Posted by kjc2260 View Post
I agree with NnF on keeping the V8. I have the same engine in my '77 that I'm in the process of rebuilding. As far as power goes, here are the specs-1971-1990 258 150 hp@3800rpm, Torque 240 lb. ft.@1800 rpm vs. 1972-1991 AMC V8 150 hp @4200 rpm, torque 245 lb. ft. @2500 rpm. As you can see, they're pretty close and these are stock numbers.
Those numbers aren't a accurate comparison. The 258 numbers you listed are gross numbers. The 304 numbers are net.

The apples to apples net numbers for 1981 are:

258 - 110 HP @ 3500 RPM
304 - 125 HP @ 3200 RPM

Matt
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