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Unread 07-29-2009, 08:41 AM   #1
cjbomber
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Need engine and trans mission help

My buddy has a 350 and a 305 that hell sell me for a good price and im looking at a 304. What would be the best and/or cheapest way to go about this. I also need some direction in the tranny and T-case. I have an 85 CJ-7 with a 4 banger in it now with a 4 speed. I dont know what i have for axels or what my tranny or T-case are.

Thanks for any advice and reccomendations.


Matt

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Unread 07-29-2009, 09:01 AM   #2
kickingprop
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the AMC 304 would be the cheapest option as you can use a lot more trannies without adapters to them or the transfer case. Your 85 came with a Dana300 transfer case. KEEP IT. You wont find a stronger, lighter case anywhere without spending a LOT of money. If the 304 is in good condition then I'd go with it, find a T176 or maybe hunt down a T18 somewhere and mount them in front of your D300. Should be a solid drivetrain. The T18 would require an adapter for the D300 I believe

If you go with the 350 (I wouldnt mess with the 305) then an SM465 or SM420 mates very nicely to the Dana 300 also but requires an adapter. If you want to go Automatic, TH350, TH400, 700R4, 4L60 are all great transmissions with the latter 2 having overdrive.

Novak-adapt.com has TONS of info for the chevy swaps.
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1985 CJ7 Project
Phase One : 5.3L Vortec/4L60E, Moser axles for AMC20, Twin Stick'd Dana300 - Completed
Phase Two: Bedliner, Rollcage, Seats, BESRK Rear Bumper w/ tire swing, Soft Top, and a few other goodies - Mostly Complete
Phase Three: Waggy 44 front, Scout D44 Rear, 4.56's, ARB's (F/R) SOA with YJ Springs, 35x12.50x15 BFG MT - Not Even Close to beginning

Also a mostly rust-free 1970 Scout 800A That I'll get to start working on someday...

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Unread 07-29-2009, 09:14 AM   #3
KMD
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Originally Posted by kickingprop View Post
the AMC 304 would be the cheapest option as you can use a lot more trannies without adapters to them or the transfer case. Your 85 came with a Dana300 transfer case. KEEP IT. You wont find a stronger, lighter case anywhere without spending a LOT of money. If the 304 is in good condition then I'd go with it, find a T176 or maybe hunt down a T18 somewhere and mount them in front of your D300. Should be a solid drivetrain. The T18 would require an adapter for the D300 I believe

If you go with the 350 (I wouldnt mess with the 305) then an SM465 or SM420 mates very nicely to the Dana 300 also but requires an adapter. If you want to go Automatic, TH350, TH400, 700R4, 4L60 are all great transmissions with the latter 2 having overdrive.

Novak-adapt.com has TONS of info for the chevy swaps.
+1 on that. Keep it AMC
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Unread 07-29-2009, 09:29 AM   #4
kickingprop
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Another thing thats very popular and they are pretty easy to come by is to swap a 360 from a waggy instead of the 304...its the exact same sized block but quite a bit more power out of the box. Everything else would be the same as a 304 though in terms of mounting and adapting to a tranny
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1985 CJ7 Project
Phase One : 5.3L Vortec/4L60E, Moser axles for AMC20, Twin Stick'd Dana300 - Completed
Phase Two: Bedliner, Rollcage, Seats, BESRK Rear Bumper w/ tire swing, Soft Top, and a few other goodies - Mostly Complete
Phase Three: Waggy 44 front, Scout D44 Rear, 4.56's, ARB's (F/R) SOA with YJ Springs, 35x12.50x15 BFG MT - Not Even Close to beginning

Also a mostly rust-free 1970 Scout 800A That I'll get to start working on someday...

Quote:
Chrome won't get you home...BUT Rattle Can Black may just get you back"
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Unread 07-29-2009, 10:10 AM   #5
UbelGeist
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Unless you are looking to pull stumps or need it for some other big power application, I would find the 4.2 liter that was an option and put that in. That 6 cylinder will take you more places then that 304 will.
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Unread 07-29-2009, 10:22 AM   #6
cjbomber
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Originally Posted by UbelGeist View Post
Unless you are looking to pull stumps or need it for some other big power application, I would find the 4.2 liter that was an option and put that in. That 6 cylinder will take you more places then that 304 will.
Hows that?
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Unread 07-29-2009, 10:23 AM   #7
cjbomber
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Originally Posted by UbelGeist View Post
Unless you are looking to pull stumps or need it for some other big power application, I would find the 4.2 liter that was an option and put that in. That 6 cylinder will take you more places then that 304 will.
Hows that? I was thinking about a six cylinder. Would a late 80's yj 6 work?
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Unread 07-29-2009, 10:39 AM   #8
kickingprop
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yeah but then you might as well for the 4.0L from a 90's YJ or TJ, then you get fuel injection. And then the MAW's begin...

If you have a good 304 available and are looking for a reasonably priced swap, then for it. Its the least amount of work for the money. Sourcing a good I6 that doesnt need a rebuild is easier said than done.
__________________
1985 CJ7 Project
Phase One : 5.3L Vortec/4L60E, Moser axles for AMC20, Twin Stick'd Dana300 - Completed
Phase Two: Bedliner, Rollcage, Seats, BESRK Rear Bumper w/ tire swing, Soft Top, and a few other goodies - Mostly Complete
Phase Three: Waggy 44 front, Scout D44 Rear, 4.56's, ARB's (F/R) SOA with YJ Springs, 35x12.50x15 BFG MT - Not Even Close to beginning

Also a mostly rust-free 1970 Scout 800A That I'll get to start working on someday...

Quote:
Chrome won't get you home...BUT Rattle Can Black may just get you back"
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Unread 07-29-2009, 11:01 AM   #9
jwhite_00
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The least expensive would have to be the 304 or 4.2. If you go with the 4.0 you will have to deal with wiring issues and supplying the EFI with fuel. Neither is insurmountable, but it will require more work. To adapt a GM engine to your drivetrain will require an adapter. There are a number of different choices but figure around $300 and up depending on the choices you make.
I believe that anything you decide on will require a different radiator.

Cheap???? Cheap and Jeep don't belong in the same sentence.
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Unread 07-29-2009, 11:45 AM   #10
bigjoe
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2x's on either using the 304 or 4.2 (I6 258), with the 360 as another way to go if you find a good. one. As I recall the hp of the 258 and 304 are pretty close. You should be able to find a good 258 or 304. Another thing for the OP. What are your plans for the Jeep. DD, Fire trail roads, mud, rocks,etc. Depending on your use may help you choose. Goodluck.
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Unread 07-29-2009, 02:02 PM   #11
cjbomber
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Originally Posted by jwhite_00 View Post
The least expensive would have to be the 304 or 4.2. If you go with the 4.0 you will have to deal with wiring issues and supplying the EFI with fuel. Neither is insurmountable, but it will require more work. To adapt a GM engine to your drivetrain will require an adapter. There are a number of different choices but figure around $300 and up depending on the choices you make.
I believe that anything you decide on will require a different radiator.

Cheap???? Cheap and Jeep don't belong in the same sentence.
hahahaha, That sounds about right. I would prefer to keep it carborated just because, well i just like it. I wheel mud and trails up to camp, nothing extreme like slick rock but its not like i dont get it stuck either. LIke a weekend warrior. I might see if i can throw a I6 in it and buy an adapter. I just bought a 4 inch lift and im lookign around for some 33 inch mud terrans and then this motor swap is on my list. Then ill let the wallet fill so i can do some more money spending haha. Ill look into that 304 and that I6. Thanks
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Unread 07-29-2009, 02:23 PM   #12
kickingprop
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an 4.2 or 304 with a T176 and dana300 would be a great combo for what it sounds like your end use plans are. I'd look into going that route personally. Just my $0.02

You would get great street manners out of the T176 but it would still be rugged enough for what you want to do offroad
__________________
1985 CJ7 Project
Phase One : 5.3L Vortec/4L60E, Moser axles for AMC20, Twin Stick'd Dana300 - Completed
Phase Two: Bedliner, Rollcage, Seats, BESRK Rear Bumper w/ tire swing, Soft Top, and a few other goodies - Mostly Complete
Phase Three: Waggy 44 front, Scout D44 Rear, 4.56's, ARB's (F/R) SOA with YJ Springs, 35x12.50x15 BFG MT - Not Even Close to beginning

Also a mostly rust-free 1970 Scout 800A That I'll get to start working on someday...

Quote:
Chrome won't get you home...BUT Rattle Can Black may just get you back"
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Unread 07-29-2009, 03:10 PM   #13
UbelGeist
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I have a 304 CJ7 and a 4.2 CJ5. That CJ5 has plenty of power to crawl around any trail that I have been on. It has better low end torque then the V8. The V8 will make its best torque at a high RPM which mean higher RPM when you pop the clutch and more chance of wheels spinning. Also, the power available from the 4.2 and the 304 are about the same. The 4.2 weights less then the 304. The 304 is about 650lbs and the 4.2 (somebody correct me if I am weight of base on this) is about 500lbs. If you had a 304 readily available, I would say go ahead and throw it in, but if I were going to swap in a gas engine I would go with the 4.2 or if I wanted a V8, I would bypass the 304 and go to the AMC 360. I am actually in the middle of swapping my 304 out for a diesel.
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Unread 07-29-2009, 06:21 PM   #14
cjbomber
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A diesel ehh? Ive heard they are starting to make a rise in the jeep world. Good luck with that. that 4.2 liter, that would be an I6 right? or is it the V6? cause im sure i culd find one an I6.

Kickinprop - yea ive been reading the Novak site and im definatly going to keep my d300 and ill see what i have for a transmission. I hope its the T176. What would you guys reccomend, staying Carborated or moving to fuel injection? I mean it doesnt make a difference really that im not going to use this in extreme cases but whats your thoughts?
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Unread 07-29-2009, 10:11 PM   #15
rustymudder
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Since you have a 4 cylinder that 4 speed is gonna most likely gonna be the T4. You don't want that tranny cause it's weak and it is different than the variety that is attached to the factory 6 cylinder.
Look for a T176 from an 80's CJ7 with the 4.2L. that will bolt right up to the AMC 6 and 8 cylinders and to your dana 300.

The 4.2L/258 is a great motor. The factory carb on them is horrible unless very well maintained. There are several carb options like the webber, motorcraft, or holley 4 barrels. They will be better than the stock carb, but I put the Howell TBI fuel injection kit on my 4.2L. Incredible improvement, every morning fires right up and idles great. Its a lot more than a new carb, but It's worth it.
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