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Jeep frames/engines

I have always assumed that same year and model Jeeps were made with the same frames and then had different size engines put in them. As an example, the CJ5 I own came with a factory V8 304, so I assumed that frame is the same as a CJ5 that came with an inline 6.

A friend of mine is trying to convince me that the smaller engine jeeps had a lighter frame than the bigger engine Jeeps. We are talking same year and model. So he is saying my CJ5 frame with the 304 is beefier than the same year CJ5 that has the I6.

The reason that I ask is that I know there were some 4 cylinder scramblers made and if I happened to find one of those I would want to upgrade the engine.

Can anyone settle a bet? I got a 12 pack of Shiner riding on this to prove him wrong.


Definitley Certifiable
CJ-8.com Member
"Lighter" as in thinner gauge metal used to construct the frame?
Far as I know, all frames are the same outside of the front shock mounts pre 1981 and then the differences between CJ5, CJ7, and CJ8 for length and extra body mounts / crossmembers.

The only way frames get lighter around here is with rust ;)

Thanks for the help guys.

As 'Norm' says the two best kinds of beer in the world are 'free' and 'free light'.

I hadn't thought about the suspension being different, I guess it would be slightly heavier or lighter suspensions depending on 4,6 or 8 cylinders, or in the case of the CJ8's just 4 or 6?

My buddy put YJ leaf springs under his '77 CJ5 / 304. What do most of y'all upgrade your suspension with?