Question on 390 swap
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Question on 390 swap
I recently bought a 390 for my 1979 ford f150 which currently has the stock 351M. My question is, will the motor mounts need to be changed? And will my 390 bolt up to the C6 thats is currenty in the truck with the 351M. My 390 came with its motor mounts and its C6 but just not wanting to swap them out if I dont need to, Any thoughts? Oh and I have a 9 inch lift and always hear about haveing to change oill pans and not being able to fit headers cause of the front diff, any thoughts on that as well, thanks again for every ones in put
Brody
Brody
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From: Pittsburgh
You'll need to use the C6 that came with the 390. But seeing as how your truck seems to be a 4x4, this may be more involved than it seems.
IIRC all 390 4x4's came with a divorced transfercase, and i'm pretty sure that by 79, the 4x4's were all using married cases.
The issue here is that the output shaft length is different between the 4x2/divorced 4x4 and the married 4x4 setup. The remedy to this situation is to have the 390 C6 rebuilt using the 351M C6's output shaft and tail housing (if the 390 C6 is a 4x2 or divorced 4x4 unit)
Justin
IIRC all 390 4x4's came with a divorced transfercase, and i'm pretty sure that by 79, the 4x4's were all using married cases.
The issue here is that the output shaft length is different between the 4x2/divorced 4x4 and the married 4x4 setup. The remedy to this situation is to have the 390 C6 rebuilt using the 351M C6's output shaft and tail housing (if the 390 C6 is a 4x2 or divorced 4x4 unit)
Justin
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Joined: Apr 2004
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From: Golden, CO
The bell housing between the two engines will not match, you'll have to use the tranny. Don't know about mounts, perches, or headers, someone else will come along who has dealt with that.
If all you have is the front sump pan, try it out while you look for the rear sump. My stock '74 had a front sump pan when I bought it. The pan had a deep dent in the bottom where it self-clearanced. It had been driven that way for several years before I bought it, you may not have trouble with that much lift.
JMHO
The 3/4 ton would have the 390 and divorced transfer case, half-tons would have 360s with integral transfer case. More choices when you need parts-n-parts. Good catch with the 2x to 4x differences Justin.
If all you have is the front sump pan, try it out while you look for the rear sump. My stock '74 had a front sump pan when I bought it. The pan had a deep dent in the bottom where it self-clearanced. It had been driven that way for several years before I bought it, you may not have trouble with that much lift.
JMHO
Originally Posted by Hoxi
IIRC all 390 4x4's came with a divorced transfercase, and i'm pretty sure that by 79, the 4x4's were all using married cases.
Last edited by Hypoid; Aug 28, 2006 at 12:48 AM.
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From: Littleton, CO
Originally Posted by Brom014
Oh and I have a 9 inch lift and always hear about haveing to change oill pans
Brody
Brody
--Mike
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Originally Posted by hoxiii
You'll need to use the C6 that came with the 390. But seeing as how your truck seems to be a 4x4, this may be more involved than it seems.
IIRC all 390 4x4's came with a divorced transfercase, and i'm pretty sure that by 79, the 4x4's were all using married cases.
The issue here is that the output shaft length is different between the 4x2/divorced 4x4 and the married 4x4 setup. The remedy to this situation is to have the 390 C6 rebuilt using the 351M C6's output shaft and tail housing (if the 390 C6 is a 4x2 or divorced 4x4 unit)
Justin
IIRC all 390 4x4's came with a divorced transfercase, and i'm pretty sure that by 79, the 4x4's were all using married cases.
The issue here is that the output shaft length is different between the 4x2/divorced 4x4 and the married 4x4 setup. The remedy to this situation is to have the 390 C6 rebuilt using the 351M C6's output shaft and tail housing (if the 390 C6 is a 4x2 or divorced 4x4 unit)
Justin
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Joined: Apr 2005
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From: UTI student
Did the 390 come with the mounts and the metal towers or just the mounts? You could use the metal towers from any FE or the inline 6. They are the same towers. I haven't really looked too hard but the only pan I have found for FE 4x4 is an aftermarket in the summit truck section for almost $300
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Joined: Jul 2003
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From: Pittsburgh
Originally Posted by hatemakings/n
Did the 390 come with the mounts and the metal towers or just the mounts? You could use the metal towers from any FE or the inline 6. They are the same towers.
Justin
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