Overhauling 80 CJ-7 with a 4.5BT Cummins - Page 3 - JeepForum.com

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post #31 of 61 Old 11-30-2012, 05:30 AM
youngjeeper11
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How is this project coming along?


Jeep 1:Used to have a 93 YJ 2.5l- 3.5" Black Diamond, Chevy TBI 5.7l V8, SM 465 4 speed, 8.8 rear( 4.10, L/S), rhinoline, Mile Marker 9000, NP 231, Had to sell it due to college
Jeep 2: 89/91 YJ, 4BT Cummins, NV4500, NP 231, Old Man Emu 2.5" suspension lift, 1" body lift.....Runs and drives, but very much a project
Interned at Novak Conversions 2 summers ago

Ask me about my 4BT Cummins Motor Mounts!!
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post #32 of 61 Old 11-30-2012, 05:39 AM Thread Starter
Dre40
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I just cleaned up my shop and got space to work on her now. I have leaf springs for it but was considering Coils? What do you think stay with leafs or build with coils?

image-1486195726.jpg
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post #33 of 61 Old 11-30-2012, 06:17 AM
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Haha, do you really want to open that can of worms....?

I am planning on going to coils eventually, mainly because I think they are cooler....that is my soul reasoning haha, and I want to design the full suspension myself.

Jeep 1:Used to have a 93 YJ 2.5l- 3.5" Black Diamond, Chevy TBI 5.7l V8, SM 465 4 speed, 8.8 rear( 4.10, L/S), rhinoline, Mile Marker 9000, NP 231, Had to sell it due to college
Jeep 2: 89/91 YJ, 4BT Cummins, NV4500, NP 231, Old Man Emu 2.5" suspension lift, 1" body lift.....Runs and drives, but very much a project
Interned at Novak Conversions 2 summers ago

Ask me about my 4BT Cummins Motor Mounts!!
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post #34 of 61 Old 11-30-2012, 02:40 PM Thread Starter
Dre40
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LOL well I had thought about it. but I'm going to roll with my leaf springs. lol Hey do you know if a standard Chevy 350 clutch will bolt up to this flywheel? or do I need to order a special one?
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post #35 of 61 Old 11-30-2012, 05:58 PM
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Wouldn't a Perkins diesel be an easier swap. They were used in jeeps in the late 70' s.

"Nothing in the world can take the place of Persistence. Talent will not; nothing is more common than unsuccessful men with talent. Genius will not; unrewarded genius is almost a proverb. Education will not; the world is full of educated derelicts. Persistence and determination alone are omnipotent. The slogan 'Press On' has solved and always will solve the problems of the human race." Supposedly President Coolidge
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post #36 of 61 Old 11-30-2012, 06:01 PM Thread Starter
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It's posable but I already have the Cummins. And I'm not sure how the adaptability is with the Perkins.
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post #37 of 61 Old 12-01-2012, 07:01 AM
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Originally Posted by kappa505 View Post
Wouldn't a Perkins diesel be an easier swap. They were used in jeeps in the late 70' s.
For me the best thing about the cummins is the availability of parts, and aftermarket parts, you can make some serious power from a 4BT

What Flywheel do you have again? If it was a chevy setup to begin with, like say with an SM465 I would say a standard chevy clutch would probably work, I think you can get up tp an 11" clutch then.

Jeep 1:Used to have a 93 YJ 2.5l- 3.5" Black Diamond, Chevy TBI 5.7l V8, SM 465 4 speed, 8.8 rear( 4.10, L/S), rhinoline, Mile Marker 9000, NP 231, Had to sell it due to college
Jeep 2: 89/91 YJ, 4BT Cummins, NV4500, NP 231, Old Man Emu 2.5" suspension lift, 1" body lift.....Runs and drives, but very much a project
Interned at Novak Conversions 2 summers ago

Ask me about my 4BT Cummins Motor Mounts!!
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post #38 of 61 Old 12-01-2012, 07:26 AM Thread Starter
Dre40
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Yes it's a P30 Chevy set up using a SM-465 so I think a standard Chevy clutch will work to.
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post #39 of 61 Old 12-06-2012, 01:25 PM
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Yup reg SBC stuff is all you need. Dre you could always do as I am. Leafs out back, coils (coilovers) up front. I figure it worked beautifully for nearly every car manufacturer out there for decades. Plus you could make me a nice deal on a pair of your leafs!
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post #40 of 61 Old 12-08-2012, 08:02 AM Thread Starter
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I had thought about that. But not sure what coils to use and weather I want to go through the trouble of setting it all up. Was thinking of going to the U-Pull and looking around for ideas. I need to pick up a steering box anyways.
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post #41 of 61 Old 12-13-2012, 08:48 AM
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Here is what and who I went with... These things ain't cheap! I'd never given it much thought but I didn't know they were this high until I started shopping

http://www.polyperformance.com/shop/...t-p-30147.html

I am using a '78-9 F150 axle so my geometry is kinda done for me. What front axle you gonna run? I have an early Bronco Dana 44 housing that uses the same mounts (easy set up) for sale. It should match the 5.5 on 5 bolt pattern and width pretty close of the CJ rear It is driver's drop, so you'd need a more modern GM TC.
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post #42 of 61 Old 12-13-2012, 08:57 AM
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Originally Posted by twiisted71 View Post
Here is what and who I went with... These things ain't cheap! I'd never given it much thought but I didn't know they were this high until I started shopping

http://www.polyperformance.com/shop/...t-p-30147.html.
Do you still need to buy the coils then too?

I was looking at king shocks, I want to do coilovers all four corners eventually.

Jeep 1:Used to have a 93 YJ 2.5l- 3.5" Black Diamond, Chevy TBI 5.7l V8, SM 465 4 speed, 8.8 rear( 4.10, L/S), rhinoline, Mile Marker 9000, NP 231, Had to sell it due to college
Jeep 2: 89/91 YJ, 4BT Cummins, NV4500, NP 231, Old Man Emu 2.5" suspension lift, 1" body lift.....Runs and drives, but very much a project
Interned at Novak Conversions 2 summers ago

Ask me about my 4BT Cummins Motor Mounts!!
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post #43 of 61 Old 12-13-2012, 07:55 PM Thread Starter
Dre40
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well I have a 3/4 ton D44 already with high steer set up. the rear is a AAM 14bolt I think I'm going to stay with leaf springs for now get the rig running wheel it a bit then save the $ and change to a 4 link.
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post #44 of 61 Old 12-13-2012, 08:09 PM
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Originally Posted by youngjeeper11 View Post
Do you still need to buy the coils then too?

I was looking at king shocks, I want to do coilovers all four corners eventually.
Yep that price is just the shock. One thing to remember, if you aren't racing it don't get sucked into the remote reservoir, double billy bad-***, doo-hickey shocks. Those things are for Baja racers, but they look complicated so it must be better for everything, right?

Coils were reasonable, considering. you'll also need bolts and mounting tabs and hoops/towers.
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post #45 of 61 Old 12-13-2012, 08:15 PM
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[QUOTE=Dre40;14605708]well I have a 3/4 ton D44 already

Thats what I started with and then swapped the outers onto an F150 Dana 44 housing with 1/2" thick tubes like the F250s. I already knew I wanted to stretch the front and didn't want to stretch the frame and have shackles/mounts out there still. So going with the radius arms will simplify everything. Its going to be my DD so I didn't want to go crazy with suspension designed for max travel.
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