im trying to get information on whats involved in putting a 390 in my 1977 highboy and possably changing to an automatic. i have a divorced transfer case with a 4speed. will i need motor mounts? will i need diffrent tranny mount?
1977 400 to 390
Started by
77 crummy
, Jan 19 2007 04:24 PM
4 replies to this topic
#2
Phillip
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F-Series Newbie
Posted 21 December 2007 - 03:03 PM
im trying to get information on whats involved in putting a 390 in my 1977 highboy and possably changing to an automatic. i have a divorced transfer case with a 4speed. will i need motor mounts? will i need diffrent tranny mount?
Hello I know its been all most a year since you put this post on and wondering if you figured out what you wanted to know if not my my guess would be that you wouldnt have to do anything to the motor mounts but since your going to pull the motor i would go ahead and change them anyway and as far as the transmission mount i think you would have to change the mount and the bracket but if you had allready gotten everything to gather then what did you have to do because im going from a 400 to a 390 also but going to 4spd instead and let me know how well that 390 is i havent gotin yet but im wondering
#4
junkman123
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Where's My Hammer!?!
Posted 14 February 2008 - 12:11 PM
im trying to get information on whats involved in putting a 390 in my 1977 highboy and possably changing to an automatic. i have a divorced transfer case with a 4speed. will i need motor mounts? will i need diffrent tranny mount?
if your still wondering you don't need to do anything just get your parts and put it in. bell housing, clutch pivot ball bracket are different. FE bolts to the block not the bell housing like the modified. If you have an auto you should be good. The frames didn't change and these style of trucks originated with the FE motor.
#5
junkman123
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Where's My Hammer!?!
Posted 14 February 2008 - 12:15 PM
Hello I know its been all most a year since you put this post on and wondering if you figured out what you wanted to know if not my my guess would be that you wouldnt have to do anything to the motor mounts but since your going to pull the motor i would go ahead and change them anyway and as far as the transmission mount i think you would have to change the mount and the bracket but if you had allready gotten everything to gather then what did you have to do because im going from a 400 to a 390 also but going to 4spd instead and let me know how well that 390 is i havent gotin yet but im wondering
you'll need a clutch pivot ball bracket and bell housing. 184 tooth flywheel. the pivot ball bracket bolts to the block not the bell housing like the modified. If you got that just put it in. Nothing else needed.
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