300 - 302
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New User
Joined: Oct 2008
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300 - 302
i have a 84 150 with a 300 in it and a 3spd wit granny and it has no power to it and i have to have it in 2nd going like 25 up every hill (and i live in pennsylania) so i want to put a 302in it and i was wondering if the trany transfer case and everything else would match up or what would i have to get?? please help thankyou
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
Yes a 302 will bolt in, but you should look at your gearing first because if an I6 won't push the truck a 302 certainly won't. There's a good chance you have 3.08 or 2.73 gears, a change to 3.55 would help immensely, and if you swap the 302 in you'll need 3.73-4.10 gears.
Senior User
Joined: Nov 2006
Posts: 203
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That truck should at least be able to do that even if you have 2.73's. I would say there is something not right with the engine causing poor performance. Is the truck original? ie, stock motor, tranny, rear end, etc. .
Elder User
Joined: Oct 2007
Posts: 566
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conaski: I once helped a buddy do a gear swap on a milddle 80s F100 with 300 & 4 speed overdrive combo that had 2.47 gears, In overdrive it was not happy even on level ground. so, this could be the problem through big hills in Penn.
Moderator
Joined: Jan 2001
Posts: 56,997
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From: Virginia
A 84 300 may have the computer control system which among other things, controls the timing. Lots of things to go wrong with that system. I feel it's a cop out to recommend to everyone that they ditch this system and put a regular distributor in, but if it were mine that's what I would do.
If you do not have a vacuum line going to the dist, then you do have the computer.
If you do not have a vacuum line going to the dist, then you do have the computer.
