engine swap
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New User
Joined: Feb 2004
Posts: 12
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engine swap
Hi Everyone, just registered, looks like I've found a great sight for info! My question is I have a 84 F/S Bronco with a 300 I/L 6 cyl. and have found a donor 78 Bronco with a 351m in it. Both have standard trannies but I would like to keep the tranny that I have 4spO/D. How much work is involved swapping a six to an eight and will it bolt to my existing tranny? I asked a transmission guy and he said it would bolt right on without making any changes.
Elder User
Joined: Jan 2003
Posts: 851
Likes: 1
since both are 4spd yes it will using the 351M's bellhousing mate to your 4spd. but the I6 uses the small block bolt pattern IE. I6,302,351w. 315m/400 is big block pattern 460/429.
as for the motor swapping right over. No you'll have to hunt dowd a early 80's 3/4 or 1ton to get the frame mounts for the 351m. Your easiest swap wouild be a 302 or 351W.
If the price is right on the 78 bronco donor go a head nd pick it up because you can swap swap all the drive ntrain into yours for a solid D44 in your 84. a good 351m can be sold easily to get some $$ back. and a bullet proof NP205 Tcase for your bronco to replace the np208's found in 84.
as for the motor swapping right over. No you'll have to hunt dowd a early 80's 3/4 or 1ton to get the frame mounts for the 351m. Your easiest swap wouild be a 302 or 351W.
If the price is right on the 78 bronco donor go a head nd pick it up because you can swap swap all the drive ntrain into yours for a solid D44 in your 84. a good 351m can be sold easily to get some $$ back. and a bullet proof NP205 Tcase for your bronco to replace the np208's found in 84.
Hotshot
Joined: Jul 2002
Posts: 14,285
Likes: 12
From: Bend,OR
what he is sayin is. you will need the bellhousing that is currently bolted to the 351m to replace the housing that is bolted to your 300-6 /tranny. the frame mounts from the doner rig wont work on the 84. personally i feel the 351m is a boat anchor. there is little aftermarket mods for it . I would pass it up and find yourself a 351w because parts and aftermarket are more plentiful.
good luck
good luck
