Need Advice on Purchase: Grand Wagoneer -
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 > Models > Full Size Jeep Forum > Need Advice on Purchase: Grand Wagoneer

Introducing MONSTALINER™ UV Permanent DIY Roll On Bed LineThe Original 3/8" Ruffstuff Diff Cover!Ruffstuff Axle Simple Swap Kit!

Unread 09-23-2008, 10:55 PM   #1
Registered User
Join Date: Sep 2008
Location: Oregon
Posts: 1
Need Advice on Purchase: Grand Wagoneer

Hey guys, new here and about to (hopefully) become part of the family. This vehicle will probably not be driven daily, as I have a gas-saver 2wd pickup for that use.

Anyway, the vehicle is a 1989 Jeep Grand Wagoneer. The Good is it has the "ultimate" package, power everything, leather, etc. It seems to be in good shape and the paint is good.

The bad part is, the engine is shot. An AMC-360. However, he is giving me with it, a freshly rebuilt AMC 304. Now, I've searched and found information about swapping the 360 in for a 304, but what about the other way around? How well will it work?

I'm getting a great deal on it, and I hope I will like it. What kind of mileage can I expect from the 304?

rowdy235 is offline   Reply With Quote Quick reply to this message
Unread 09-25-2008, 12:48 AM   #2
BJ's Off-Road
Registered User
1979 FSJ Cherokee 
Join Date: Oct 2004
Location: Gig Harbor, WA
Posts: 1,379
The swap should be easy as they are the same block. You may want to use the 360 heads as I believe (not positive) the 360 heads had the dog leg exhaust which makes them flow a whole lot better.

304 Mileage, I would expect to be about the same (10-ish) as it would have to work a whole lot harder to move the big, heavy GW. I would think it would be a little underpowered as they used the 304 in the mid 70's in FSJ's but I think they were all manual transmission FSJ's w/o air conditioning.
BJ's Off-Road is offline   Reply With Quote Quick reply to this message
Unread 09-29-2008, 02:20 AM   #3
Registered User
1984 J-Series Truck 
Join Date: Nov 2004
Posts: 3,211
304 was an option in '71/72 and I had one in my '73 J4000 for more than 5 years. (I accidentally rolled the truck avoiding a horse in the road at night time) Got 17 mpg average with a dialed in Motorcraft 2bbl.
carnuck is offline   Reply With Quote Quick reply to this message

Quick Reply

Register Now

In order to be able to post messages on the forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.

Email Address:


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

Suggested Threads

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