Default Attempting 350 sbc,700R4,NP208 in CJ7 

Old 05-31-2009, 11:46 PM   #1
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I'm going to attempt a V8 conversion with a 350 sbc, 700R4 and a NP208 transfer case in my 1986 CJ7. Has anyone done this? What can I expect as far as the length of this set up?

Thanks for any info!

 

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Default Re: Attempting 350 sbc,700R4,NP208 in CJ7 

Old 06-01-2009, 07:26 AM   #2
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I know the 700r4 is a long trans. I bet your going to need a cv rear driveshaft...
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Default Re: Attempting 350 sbc,700R4,NP208 in CJ7 

Old 06-01-2009, 02:19 PM   #3
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Good to know. Now the question is, do I buy a $550 adapter to fit my Dana 300? I would like to not spend the $ till it breaks, but how much doest it cost to fix the drive shaft issue?

On a separate note, everyone I have dealt with on this site is very knowledgeable and friendly. Thank you to everyone helping me make this V8 conversion possible.

 

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Default Re: Attempting 350 sbc,700R4,NP208 in CJ7 

Old 06-01-2009, 03:32 PM   #4
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I'd run it till it brakes (but that is just me)

Once you do the swap you'll be able to measure to have your drive shafts modified (lengthened or shortened). Depending on what you need to do a local shop may be able to take care of you or you may need a CV shaft. If you need a CV shaft -->> Tom Woods Drive Shafts <<-- Tom Woods can most likely take care of you. Here is a great tech article on driveshaft geometry -->> Tom Wood's Custom Drive Shafts - Driveline 101

The big problem is that if you make the swap and DON'T put the 300 in, you'll probably have to have some drive shaft work done again. I can't be sure of that though, and if you do - it will most likely be very minor.
Thank you very much for the compliment, there is a great group of members on this site!
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Default Re: Attempting 350 sbc,700R4,NP208 in CJ7 

Old 06-01-2009, 04:19 PM   #5
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You could extend your wheel base if you need more space.btf4.jpg

btf6.jpg

 

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Default Re: Attempting 350 sbc,700R4,NP208 in CJ7 

Old 06-01-2009, 04:56 PM   #6
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the best advice I can give you is expect to spend a lot of money if you go through with this.
doing a 350 costs more than you think. There is a lot of little things that pop up that add up to big bucks. Every thing leads to something else that costs more money.
That combo is real long for a cj7 and extending your wheelbase sounds good till you find out the gas tank is in the way.
There will be a lot of custom fab work to do. If you can make parts yourself it helps but if you have to pay someone to make parts and do the work pretty soon you will have enough money in it that you could buy a new jeep.
If only it were as easy as it sounds. Just my 2 cents.
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Default Re: Attempting 350 sbc,700R4,NP208 in CJ7 

Old 06-01-2009, 04:59 PM   #7
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Sounds like I'll just use the NP208 for now if itís minimal install issues. When it breaks, I'll put in the Dana 300 and modify the axle set up. A great site for axle info CJ! I think I might eventually go Dana 60's. Looks AWESOME LongHorn . Just being on some what of a budget....I've only had my CJ7 for three months and have about $7000 into the project. Hahaha

 

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Default Re: Attempting 350 sbc,700R4,NP208 in CJ7 

Old 06-01-2009, 04:59 PM   #8
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Default Re: Attempting 350 sbc,700R4,NP208 in CJ7 

Old 06-01-2009, 05:07 PM   #9
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I know Old Dog, thatís what this turned into. But some of it's my own fault. It runs fine with the 258 in it, but not enough power for me. Plus, I love the way the old CJs look. Soon it will be a whole "new parts" Jeep. Then I will know exactly what I have. The good news is I have a connection who is an off-road fabricator. He builds rock buggies. His shop is at my disposal.

 

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Default Re: Attempting 350 sbc,700R4,NP208 in CJ7 

Old 06-05-2009, 03:17 AM   #10
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you need to decide which t case youre gonna use first because when you switch to the dana 300 if youre planning on staying passenger side drop, front drive line clearance doesnt exist at all. the tranny pan sticks out almost right in front of the front output shaft on the dana 300. you have basically 4 options when you run the 700r4 or 4l60e with a dana 300. 1 you offset everything engine tranny and transfer case an inch and a half to the driver side. 2 you can run a carrier bearing off the frame and use a 2 piece front shaft. 3 is flip the dana 300 over and run driverside drop with a ford or dodge front end. or 4 you can do like i did and run a full width chevy axle under the front. im not exactly sure on clearance with the 208. youre rear drive shaft is gonna be really short. and if you go spring over you will need a cv shaft. the swap isnt bad as long as you know what you need to watch for. i did this swap only i used an injected vortec 350 and the 4l60e with the dana 300. im also sring over and full width axles. let me know if there is anything else youre curious about. but definately figure out your t-case situation before you go together with it.

 

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