Identifying The Firewall Layout.

[onlyinajeep726]

Can anyone tell me by looking at these pictures if this is the typical pre-'87 firewall or if this is the one with the revision for the 4.0?  It's hard to tell just by looking.

 

 

 

 

[Alexia]

1986- - The dipped front cross member and the non-depressed area next to the large oval wire grommet hole gives it away.

[HOrnbrod]

Excellent Alex. I had no idea since I've never had an 86.  :thumbsup:

[onlyinajeep726]

1986- - The dipped front cross member and the non-depressed area next to the large oval wire grommet hole gives it away.

 

Ok, so you're saying that the dipped front cross member is only found in the MJ's with the non-depressed area next to the oval?  The reason I'm asking is because I heard from some users here that some late '86s had the revision for the 4.0 firewall but I didn't know if the front crossmember would be like the '87+ or still like the '86-, ie, both go hand in hand.

[onlyinajeep726]

Ok, I looked at some previous threads covering this topic.  I see where the difference lies.  Not sure why I didn't quite catch it the first time.

 

http://comancheclub.com/topic/31039-big-swap-help/?p=314518