AMC th400 to Buick 350 instead of 360 in 74 J10 - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Full Size Jeep Forum > AMC th400 to Buick 350 instead of 360 in 74 J10

FLASH SALE! Open thread to reveil the Newest Sale @ ROCKRIFS: Wranger BRIGHT License Plate LED! Just $3! Great valuePremium LED Lighting by VISION X, Proudly sold at ROCKRIDG

Reply
Unread 03-06-2013, 05:25 PM   #1
Justins74J10
Registered User
1974 J-Series Truck 
 
Join Date: Mar 2013
Location: Covington, Washington
Posts: 4
AMC th400 to Buick 350 instead of 360 in 74 J10

Hello all,
I have a 74 J10 with a blown 360 and i have the opportunity to get a Buick 350 from a 69 Waggy will it bolt up? or do i need mounts and an adaptor? to make it work? Anything helps but the owner is going to scrap it pretty soon
Thanks
Justin

Justins74J10 is offline   Reply With Quote Quick reply to this message
Unread 03-07-2013, 05:24 AM   #2
timgr
Registered User
1975 CJ6 
 
Join Date: Dec 2012
Location: Medford, MA
Posts: 463
No, it will not bolt up. A '74 Jeep TH400 has an AMC case that only works with AMC engines.

If you want just the engine - cheapest route would be to find a TH400 from a Buick (BOP pattern) and install the tail shaft from your AMC TH400. You need the Jeep tail shaft to work with your transfer case. The tail shaft is the last thing to come out of a TH400, so you'll need to do a complete tear down.

And the mounts will be different. And the radiator. Lots of details will be different.

Or get the complete '69 Wagoneer and use everything - engine, transmission and transfer case. That way you get rid of your QuadraTrac and replace it with a Dana 20.
__________________
1) '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS, hubcaps. 2) '82 J20 360/T18/NP208/3.73, KOs, 7600 GVWR 3) '75 CJ-6, 304/T15, PS, BFG KM2s, soft top 4) '95 VW Golf Sport 2000cc 2D
timgr is offline   Reply With Quote Quick reply to this message
Unread 03-07-2013, 01:40 PM   #3
Justins74J10
Registered User
1974 J-Series Truck 
 
Join Date: Mar 2013
Location: Covington, Washington
Posts: 4
Thank you for replying so fast. I will see how much he would sell it all for. With the 350 would it be best to fabricate some mounts? If i found a good 360 or a 401 and a dana 20 would i still need to do a complete tear down to the the tail shaft? Or is just the th400 to dana 20 adapter needed? My current 360 has a spun cam bearing with metal shards all over the pan and in the oil pickup filter. Would it be worth it to scrap the block and go buy a good one for 3 to 4 hundred dollars instead of the 350? For the whole wagoneer he told me 750$ Let me know what you think
Thanks,
Justin

Last edited by Justins74J10; 03-07-2013 at 02:05 PM..
Justins74J10 is offline   Reply With Quote Quick reply to this message
Unread 03-07-2013, 02:08 PM   #4
timgr
Registered User
1975 CJ6 
 
Join Date: Dec 2012
Location: Medford, MA
Posts: 463
If you hae the Quadratrac now, you'll need to swap output shafts to go to a Dana 20. The ouput shaft for the Quadratrac is unique.

A used engine will be your cheapest repair, if you can find a good one.

If you want to rebuild and your 360 block is damaged, it will almost certainly be cheaper to find another core engine to start from. If just the cam bearing is damaged, clean the block and reuse it. Your machine shop should advise you about this at no cost. Take the block to them and ask whether it's ok, and if it will need expensive extra machining.

Likely you can take the frame brackets from the 350 Wagoneer and they will bolt on. The 350 Buick is a great engine, lots of torque - meant to move heavy Buick passenger cars. The main downside to the 350, as I see it, is that you'll have the wrong engine in the chassis, and the Buick setup has some quirks. Parts are less plentiful for the Buick-engined FSJs than the AMC-powered trucks; things like a radiator will be harder to source. Kaiser used an unusual adapter between the engine and the TH400 that was unique to Jeep, and it has its own torque convertor. If you need a torque convertor, you'll likely have to have your core rebuilt. There may be no source for new, compatible flex plates. Likely other issues. Things will be simpler if you stay with AMC.

Or, if you want to go all-out, find a Chevy 4x4 donor and replace the engine, transmission and transfer case together. The Chevy swap is pretty popular, and would likely sell easily if it were done well. You could go with a 700R4, which is more efficient than the TH400, and gives you an overdrive gear. And parts would be easy to find and cheap, as long as you keep track of what was used where.
__________________
1) '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS, hubcaps. 2) '82 J20 360/T18/NP208/3.73, KOs, 7600 GVWR 3) '75 CJ-6, 304/T15, PS, BFG KM2s, soft top 4) '95 VW Golf Sport 2000cc 2D
timgr is offline   Reply With Quote Quick reply to this message
Unread 03-07-2013, 09:42 PM   #5
Justins74J10
Registered User
1974 J-Series Truck 
 
Join Date: Mar 2013
Location: Covington, Washington
Posts: 4
I have thought about doing that i have a chevy 350 laying around but i wasnt sure how it would bolt in and the mounts i would need.
Thanks
Justin

Last edited by Justins74J10; 03-08-2013 at 01:18 PM..
Justins74J10 is offline   Reply With Quote Quick reply to this message
Unread 03-08-2013, 07:48 AM   #6
CSP
Registered User
 
Join Date: Aug 2002
Location: Colorado
Posts: 12,336
Quote:
Originally Posted by Justins74J10 View Post
Is long block or the small block better for putting in my j10
You're mixing terminology there. A long block refers to an engine assembly that has the heads installed vs. a short block which is just the block and the internals of the block.

A small block refers to the smaller block V8s that Chevy built like the 350, 327, 400, etc. The alternative would be the big block meaning the 396, 427, 454 etc.

Your easiest alternative is another AMC 360 or maybe even a 401. No adapting, not changes in radiators, exhaust, wiring etc and they are fairly easy to find.
CSP is offline   Reply With Quote Quick reply to this message
Unread 03-08-2013, 01:20 PM   #7
Justins74J10
Registered User
1974 J-Series Truck 
 
Join Date: Mar 2013
Location: Covington, Washington
Posts: 4
For the Chevy 350 or 400 what mounts would i need? And where is a good place to get them?
Thanks
Justin

Last edited by Justins74J10; 03-08-2013 at 01:55 PM..
Justins74J10 is offline   Reply With Quote Quick reply to this message
Unread 03-16-2013, 07:41 AM   #8
BJ's Off-Road
Registered User
1979 FSJ Cherokee 
 
Join Date: Oct 2004
Location: Gig Harbor, WA
Posts: 1,379
Quote:
Originally Posted by Justins74J10 View Post
For the Chevy 350 or 400 what mounts would i need? And where is a good place to get them?
Thanks
Justin
http://www.bjsoffroad.com/ProdList.asp?scat=79
BJ's Off-Road is offline   Reply With Quote Quick reply to this message
Reply

Tags
amc 360 carb 4 barrel bbl , buick , j10 , quadratrac , th400

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.
Note: All free e-mails have been banned due to mis-use. (Yahoo, Gmail, Hotmail, etc.)
Don't have a non-free e-mail address? Click here for a solution: Manual Account Creation
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.


Thread Tools






Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.