New jeep - JeepForum.com
 
LinkBack Thread Tools
post #1 of 14 Old 01-26-2020, 10:57 PM Thread Starter
Koda96
Registered User
 
Koda96's Avatar
 
Join Date: Jan 2020
Posts: 5
New jeep

So I'm new to this and just got a 1980 j20. How hard would it be to do a swap on it with a 5.7 hemi?

Koda96 is offline  
Sponsored Links
Advertisement
 
post #2 of 14 Old 01-27-2020, 09:53 AM
cpia84
Registered User
 
cpia84's Avatar
1990 YJ Wrangler 
 
Join Date: Jun 2019
Location: Goldsboro
Posts: 313
Garage
Quote:
Originally Posted by Koda96 View Post
So I'm new to this and just got a 1980 j20. How hard would it be to do a swap on it with a 5.7 hemi?
Do you have the 5.7Hemi already? Do you have the wiring harness/computer? What is your plan with the truck? What is currently in the truck? is the engine gone or locked up? Or just looking for a more modern engine. From personal experience i prefer to work on an older engine with less computer stuff than a new one. If you dont have an engine an LS swap is very common and are readily available.

I am not exactly sure how easy or difficult that particular swap would go but the more stuff you have with the new engine the easier it will be. What transmission and transfer case do you plan on pairing with the Hemi? There are Hemi builds out there so i would just read up and do lots of research on how they did their swaps. With the J20 i would suspect there is plenty of room but you will probably have to fab up new motor mounts.

Good luck with the build and keep us posted.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
cpia84 is offline  
post #3 of 14 Old 01-28-2020, 11:26 AM Thread Starter
Koda96
Registered User
 
Koda96's Avatar
 
Join Date: Jan 2020
Posts: 5
It has the amc in It and it runs good it's just very rough, like it needs a rebuild. What would be the best kit for it?

Last edited by Koda96; 01-28-2020 at 10:11 PM.
Koda96 is offline  
 
post #4 of 14 Old 01-30-2020, 09:05 PM
CSP
Registered User
 
Join Date: Aug 2002
Location: Colorado
Posts: 17,115
Depends entirely on your knowledge, tools and ability to either figure it out yourself or open your wallet to let someone else do that. I don't think anyone can answer those questions for you.
CSP is offline  
post #5 of 14 Old 01-31-2020, 05:54 AM
jeepdaddy2000
Registered User
 
jeepdaddy2000's Avatar
1971 CJ5 
 
Join Date: Jan 2002
Location: Eagle Point
Posts: 8,475
Quote:
It has the amc in It and it runs good it's just very rough, like it needs a rebuild.
Or a tune up......
Perhaps if you gave us what you know about the current engine (size, compression, oil consumption, leakage, existing upgrades/modifications, etc...) we could help you with it, unless, of course, the objective is to replace it.......

The duty of a patriot is to protect his country from it's government
Thomas Payne
jeepdaddy2000 is online now  
post #6 of 14 Old 01-31-2020, 07:46 AM
cpia84
Registered User
 
cpia84's Avatar
1990 YJ Wrangler 
 
Join Date: Jun 2019
Location: Goldsboro
Posts: 313
Garage
I agree with those above. I would do a tune up. Even if you want to eventually replace it, a working running drivetrain combination could easily be sold to someone. I personally would keep what i have unless the work to get it running well would be a complete rebuild or overhaul then i would look at an engine swap. The other thing if you are looking for more of a modern type ride with a classic look is to do a body swap. I am not sure on how things would line up on a RAM 1500 but im sure it pretty close. If you are better at fabrication over mechanical then i'd do the body swap otherwise if you are better at mechanical then do the tune up and if you still want to do an engine swap then pull the running engine/trans and sell it to help fund the new drivetrain.

Just a few thoughts and suggestions. But definitely give up info and pictures of your truck. I love the old Jeep trucks, I cant stand the new 'gladiator' truck thing that jeep sells.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
cpia84 is offline  
post #7 of 14 Old 02-01-2020, 02:21 PM Thread Starter
Koda96
Registered User
 
Koda96's Avatar
 
Join Date: Jan 2020
Posts: 5
It has the 360 in it, with a 2 barrel Holley carb.im not sure about the compression or oil consumption but I don't see any leaks while it's running. It's all pretty stock still, it was a government vehicle at one point I think cause the passenger door has dept of energy for official use only written on it.
Attached Thumbnails
20200201_141005_1580591844872.jpg   20200201_140932_1580591863483.jpg   20200201_140921_1580591878488.jpg   20200201_140912_1580591897868.jpg  
Koda96 is offline  
post #8 of 14 Old 02-02-2020, 07:46 PM
BagusJeep
Web Wheeler
 
BagusJeep's Avatar
1981 CJ7 
 
Join Date: Jul 2009
Location: Bali
Posts: 7,266
Nice find!!!!!

You could try a carb rebuild kit ($15 plus can of cleaner) and new plugs, leads, cap ($30) and new fuel filter ($%), clean out the fuel line with fresh gas ($10) etc.

If you want to go all Rambo and put a fresh engine in, the Hemi is not a popular candidate. it will probably fit, a FSJ is huge, but the point sto consider are how you are going to hook it up to its electronics and how is going to put the power down, the transmission adapter will be an important consideration. Most people would go for a chevy, either a traditional SBC or a more modern LS type. This is because they are cheap and the conversion parts are easy to find. Look up novak transmissions and advance adapters for more. All in about $6000, more if you change out the transmission.

BagusJeep lives in Bali.

1981 CJ7 258ci - Bagusjeep
1984 CJ7 258ci - Puthijeep
1981 J20 258ci - Gladys
1951 Willys CJ3A/MB/M38 - Little Willy
1995 Cherokee 4.0 - CHEROKEE
BagusJeep is offline  
post #9 of 14 Old 02-03-2020, 06:46 AM
dvn4life1972
Registered User
1987 YJ Wrangler 
 
Join Date: Oct 2013
Location: Houston
Posts: 48
Nice. My next project will be a full size jeep, so I'm a bit envious lol.

Just do what the others have said...basics on what you have for now and then see how it runs. When I bought my yj it had the original 1987 drivetrain...ran rough and weak. Rebuilt the carb, did tune up and some other minor things and it ran smoothly and strong. Was able to then sell them pretty quickly (for my swap). You can do the same, fix it, drive it for a bit, then decide if you wanna swap.

The 360 can be a rugged beast of a motor...just sayin.

1987 YJ Wrangler...let the mods begin!
dvn4life1972 is offline  
post #10 of 14 Old 02-03-2020, 07:22 AM
cpia84
Registered User
 
cpia84's Avatar
1990 YJ Wrangler 
 
Join Date: Jun 2019
Location: Goldsboro
Posts: 313
Garage
That looks like a great truck. I personally would do a tune up, carb rebuild and drive and have fun. I would keep the 360 in it.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
cpia84 is offline  
post #11 of 14 Old 02-07-2020, 10:00 AM Thread Starter
Koda96
Registered User
 
Koda96's Avatar
 
Join Date: Jan 2020
Posts: 5
So after thinking it over, I wanna do a tune up and run the motor it has. What would be a better transmission though so I have more than just a three speed in it?
Koda96 is offline  
post #12 of 14 Old 02-08-2020, 04:31 PM
dvn4life1972
Registered User
1987 YJ Wrangler 
 
Join Date: Oct 2013
Location: Houston
Posts: 48
Are you looking for another automatic, or a standard?

1987 YJ Wrangler...let the mods begin!
dvn4life1972 is offline  
post #13 of 14 Old 02-09-2020, 10:09 AM Thread Starter
Koda96
Registered User
 
Koda96's Avatar
 
Join Date: Jan 2020
Posts: 5
I would prefer a standard but I know with that I'll have to redo the whole pedal assembly.
Koda96 is offline  
post #14 of 14 Old 02-09-2020, 02:44 PM
jeepdaddy2000
Registered User
 
jeepdaddy2000's Avatar
1971 CJ5 
 
Join Date: Jan 2002
Location: Eagle Point
Posts: 8,475
Again, have you spent time driving the truck with the current transmission?
Do you know your gear ratio's?
Tire sizes?

RPM's at 55 or 65 MPH?


Once the engine is running properly, see if the transmission is coming up short on the top end. If it looks good, you may want to think about a t case swap instead.

The duty of a patriot is to protect his country from it's government
Thomas Payne
jeepdaddy2000 is online now  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.



Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome