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2.8 to 4.0, Motor Mount and gas tank Question


1BadRS

New Member
Joined
November 24, 2013
Messages
3
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City, State
Pinehurst, NC
Year, Model & Trim Level
84 and 90 Bronco II's
I have a 84 Bronco II with the 2.8 that I'd like to install a 4.0 into. Does the 4.0 use the same motor mount location that my 2.8 sits in now? I see a lot on the 2.9 to 4.0 but not much on the 2.8 to the 4.0.

Also, I know my gas tank doesn't currently have a electric pump just the pick up tube. Can I still use my tank but just buy an assembly from a 2.9 V6 or is it different sizes where I need the whole tank and pump assembly? Or do people leave the tank and pick up assembly alone and just install an inline electric pump?
 


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ifergusson

New Member
Joined
July 4, 2005
Messages
48
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1
City, State
Regina,SK.,Canada
Year, Model & Trim Level
91 Explorer/84 Bronco II
When the original gas tank on my 85 rusted out I replaced it with a newer one from a fuel injected Bronco II.The hole for the fuel pickup/pump was a lot bigger than my original and I ended up cutting the mounting ring off the fuel injected pickup and attaching it to my carbed version to make it fit.I can't imagine being able to fit a Ford electric pump into the stock 84 gas tank.
 




1BadRS

New Member
Joined
November 24, 2013
Messages
3
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City, State
Pinehurst, NC
Year, Model & Trim Level
84 and 90 Bronco II's
Looks like I would just end up getting a whole setup out of the fuel injected truck instead of trying to work with what I currently have.

Anybody on the motor mounts? I know on the 2.9 the 4.0 drops right into place but not sure that is the same for the 2.8
 




ifergusson

New Member
Joined
July 4, 2005
Messages
48
Reaction score
1
City, State
Regina,SK.,Canada
Year, Model & Trim Level
91 Explorer/84 Bronco II
I eventually want to swap in a 4.0 so I figured I might as well just work with the newer tank.I don't know about the mounts, I noticed however that on the Rockauto website the 84-85 2.8 mounts are a different number than the 2.9-4.0 ones.
 




bats

Elite Explorer
Joined
October 30, 2009
Messages
819
Reaction score
27
City, State
NY
Year, Model & Trim Level
88 Bronco II
I did the 2.9-> 4.0 swap and used the same motor mounts. I think the 2.8 uses the same mounts but I'm not 100%.

Ideally you would find a complete donor truck that was in an accident or just completely rusted out. The swap is much easier if you have the complete wiring harness to work with. My BII is an 88 and I just swapped the entire in tank assembly over from the donor (94' Explorer.) Fit just right.
 




Backwoods "X"

Active Member
Joined
June 20, 2011
Messages
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City, State
Mt. Sterling, Ky
Year, Model & Trim Level
94 XLT
you simply bolt the 2.8 brackets to the 4.0 block. Passenger side bracket has an "ear" on the front end that you need to trim off. engine mounts on frame are 2.8 specific. fuel system, used correct sending unit for the BII (86, I believe. there is a change in Ohm scale), 1st gen "X" pump, existing fuel line to supply engine, ran new for return. had to use a tank from an 85 and newer because of size of sending unit opening. 84 is 1 year only, small opening.
 




Joined
May 10, 2018
Messages
16
Reaction score
1
Location
The U.P.
City, State
Sault Ste Marie, MI
Year, Model & Trim Level
85' B2 XLT
In the middle of the exact swap. I had to use the 4.0 mounts or the oil pan wouldn't have cleared the cross member. Anything you can help with in regards to wiring would be much appreciated. have the harness out and working on the same fuel system issues. Bought parts for 88-89 including the new single pump, so we'll see.
 




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