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Unread 09-24-2006, 04:55 PM   #1
AMC Power
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1986 CJ7 
 
Join Date: Apr 2006
Location: Pittsburgh, PA
Posts: 141
Motor Mount location for AMC 258

I am currently swapping out my AMC 150 for a AMC 258. Do I have to relocate the motor mount frame brackets or will they work in the same location? Has anyone done this swap before?

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Unread 09-24-2006, 09:58 PM   #2
gosupes
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Join Date: Jun 2004
Location: Monroe, WA
Posts: 1,540
I have done it. The frame mounts are different from the 150 to the 258. On one side (pass side), you won't have a choice as you will use the outside pair of frame holes. The drivers side, you will use the front pair of frame holes. PM me if you need more info, or post back. There are a couple of others who have done this swap.
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1986 CJ7, 4.2 w/4.0 head, TFI-HEI hybrid ignition, Clifford manifold w/Holley 390 w/cold air intake, OBA, 4.5" lift, Woody CV shaft and Tattons in front, 4.10 gears - lunchbox in front, Truetrac in the back, twin-sticked, blower upgrade for running topless, trying to keep it simple.

It's just a Jeep, and if you don't wheel it once in a while, it's not even that.
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Unread 09-24-2006, 10:10 PM   #3
AMC Power
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Posts: 141
What do you mean by the outside or inside pair of frame holes? Do you have a picture of this?
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Unread 09-25-2006, 07:36 AM   #4
gosupes
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Join Date: Jun 2004
Location: Monroe, WA
Posts: 1,540
There are 3 pairs of holes in the frame rails where the motor mount brackets bolt up to for use with different engine and trans combos. Just for reference, number them pair 1 (towards the grill), pair 2 (middle) and pair 3 (towards the rear). The passenger side motor mount bracket uses pairs one and three and the drivers side uses pairs one and two. The 258 is at least 10" longer then the 150. Everything will get relocated. If you want a pic, you will have to wait until I get home later.
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1986 CJ7, 4.2 w/4.0 head, TFI-HEI hybrid ignition, Clifford manifold w/Holley 390 w/cold air intake, OBA, 4.5" lift, Woody CV shaft and Tattons in front, 4.10 gears - lunchbox in front, Truetrac in the back, twin-sticked, blower upgrade for running topless, trying to keep it simple.

It's just a Jeep, and if you don't wheel it once in a while, it's not even that.
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Unread 09-25-2006, 12:20 PM   #5
AMC Power
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1986 CJ7 
 
Join Date: Apr 2006
Location: Pittsburgh, PA
Posts: 141
Thanks for the info! I took the old mounts off and now I see the 3 pairs of holes. The new mounts line right up with the bolt holes.
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