Hi, y'all. I'm new to the board here. I have 2 passions the old mopar muscle cars and the older ford full size pickups and fs broncos. I own my 80' f-100 for years now with no problems untill my frame weakend and starting to crack. the cab and box is still in good shape. I found I truck that someone was going to salvage it but I caught him in time and bought it for a giveaway price. It's a 88 F-150 4x4 inline 6 300 FI the engine is bad/missing parts, the cab is badly dented so I had the Idea of droping my 80' cab replacing the dented 88'. the truck now looks just like my old one now just better taller with the 4x4 diff still on it. now I havent decided for an engine yet, my old truck had a carburated 351w w/ a 2x4 tranny. I would like to keep the truck with a simple carburator. the cab and wiring is off the 80, installed the 80 gas tank, got rid of the electrical gas pump. correct me if I'm wrong but I have a feeling that the bellhousing pattern is different from the inline 6 and the 351 v8. I kind of likew the 4x4 setup and wold like to keep it functional. does anybody know if the besides the intake manifold, is there a major difference on the block? can I just get a mechanical pump and install an older manifold off for ex a 82 300 carburated version? if not, does anybody know if both 300 engines have the same bellhousing pattern? if so I can get a used carburated 300 engine and bolt it directly to the 88 4x4 tranny and enjoy 4x4 if the 351W won't fit! I'm not too crazy about FI. I havend seperated the trannys from the engine yet
any helpfull comments will be very apriciated.

Thank You


1980 F-100 351W carb. 4 speed man 2x4

1988 F-150 300 (in-line 6 cyl) F.I. 5 speed man 4x4 (doner truck)

1969 Dodge Charger "General Lee"

Maurice (Moe)
MoePar

 

300, 302, 351w all use the same bellhousing bolt pattern.

 

they all should fit. Just out out the 300 & its mounts, and pull your 351w, and get the mounts off of the old truck, and put them in the new, and drop in your 351w and bolt it up. it a good bit of work to swap cabs (been there done that), but its worth it.

 

Thanks everybody for the great help, yes since I have a full doner truck (the 88 4x4) I am swapping the FI 6 to the 351W

Now, my next question:

since the manual trannys are different do I have to swap flywheels as well?

-and- how on earth do you safely disconect the #@&! plastic clutch line? I think that I have to swap the clutch pedal as well since the original setup off the 80's was the old linkage, I kind of like it but I think I have no choice in using the hydrolic setup.

Thank you all for your help, this board is great, Love these old full size Ford trucks and Broncos!

Maurice (Moe)
Moe-Par

 

You would want to keep the same flywheel with the same engine due to different counterbalances. I'm not sure if the transmission splines would be different (I don't think they are) but you might be able to use the clutch/bellhousing from your 80. I believe that the ears on the pressure plate are different between mechanical and hydraulic setups so you would want to use the clutch and corresponding linkage. Someone correct me if I'm wrong about this.

 

Thanks Guys for all the info! Just completeed the swap last night. pulled out the defected 300 FI/6 out with all wire harnesses. Then Droped the carburated 351w in - a direct bolt on. had to remove the 6cly frame engine mounts and install the 351w ones. It's amazing that both frames, my '80 2x4 and '89 4x4 are the same. all mounting hole were allready there! by the way my 89' tranny that I bolted the 351w is a 5 speed (with transfer case of course) the clutch disk, pressure plate, and clutch spline were the same. the fact that my old 2wd 4 speed tranny had a detacheble bellhousing and my new 5 speed didn't (like an auto tranny 1 piece) worried me before the swap, but everything went just fine. the engine looks nice attached to it. its funny to see all the wiring harnesses and fi stuff that I had tooken off piled-up on the ground and all I had to connect to the 351w was just a few little wires! man, carburated engines are much less complicated! The challange to me now is to convert the pedal setup from linkage to hydraulic. I think I might have to transfer the pedal setup from the donor truck and drill a hole through the fire wall to attach the master cylinder. Any suggestions for this setup is welcome. I'm really proud of this project, can't wait to put this beast on the road again!

Later,

Moe

 

Hate to say this, but the 351 wil be way short on torque compared to the 300. I have both and the 300 will pull circles around the 351. THe 351 will wind up faster but the 300 will out pull especially in the 4x4 mode. The manual 4x4 with the old style hunk of Iron trans with granny low is a pulling beast.

UPS was no dummy. That is why they bought up all available 300's when the went out of production.

 

the 300 doesn't have more torque than a 351. its torque comes in at a lower rpm. you might not have to wind a 300 up, but once you wind a 351W up a little bit, you have a lot of power. Don't get me wrong, a 300 is a great motor. For a truck, I choose it over a 302 or 289 _anyday_, but for power, 351w just has more.

300 will last a lot longer, but I believe that is mainly because they aren't reving to the moon.

 

Finnally finished my truck, it looks just like my 80' f-100, except taller w/ the added 4x4! the clutch upgrade wasn't a big deal after all, had to drill a hole about 1 1/4" through the fire wall exactly like the donor truck, had to change the pedal assy. Had to get from the salvage yard from an 84' truck pedal assy for hydrolic setup. the donor's truck was different since the dash was different as well, drilled two extra holes for the mounting studs, slided it in, hooked up the rod, filled the old linkage hole with a delete plug from an automatic truck and voila! as for the 4x4 lever I simply traced the hole pattern on cardboard, and copied it cutting the spot with an electric jig saw I road tested the truck yesterday after working on it for 3 weeks and got to tell you that the truck runs great! I allways had that fear before the project that this wouldn't work... but the results were a success! it takes off like a plane and hauls like a beast with the carburated 83' 351w engine! went for a 4x4 drive in a near construction site. man, the truck drives so different from my old setup!

Im' happy that I was able to save my F-100 (body & motor) got to tell you that my truck never drove so smooth before!

1980 Ford F-100:

89' F-150 4X4 Chassis w/differentials
-83' Carburated 351W Engine w/ it's original manual-trans. flywheel.
-80' F-100 wiring harnesses, expept reverse light and 4x4 waring light modification.
-89' TR5 5 Speed Manual 4X4 tranny w/ transfer case
-80' clutch disk and plate (identical to my 89')
-89' Hydrolic clutch master/Slave setup
-84' clutch pedal assy.
-80' starter motor
-80' steering rod
-80' Gas tank w/ sending unit
-80' Gas lines
-80' Brake booster, Master Cylinder, proportioning valve & brake lines
-89' rear brake cylinders
-89' front brake calipers (same as 80')
-89' F-250 3'' rear leaf Spring setup
-81' F-250 stock exhaust system setup
Stock steel rims w/ 15Rx10.50 tires

thanks again