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Ford Truck Club Forum > FORD F-100 | F-150 SERIES > 1992-1996 Ford F150



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  #1  
Old December 14th, 2014, 10:08 AM
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Default 302-351 engine swap, 1992 f-150

Hey guys, I have a 1992 ext cab short box 4x4 f-150, 302, 5 speed. The 302 lacks power for towing anything, even with low gears, so I found and bought a 1988 f150 with a 351 Windsor. The plan is to do a rebuild, mild pump-up on the 351, and put it and it's computer in my truck. Has anyone done this, and what kind of pain in the arse am I going to face with this project?
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Old December 14th, 2014, 11:40 AM
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The manual 5 speed won't hold up under the power of even a mildly pumped up 351, especially if you will be towing. You will need to do a full drivetrain swap.

2003 F-150 XL RCSB 2wd 4.2 5 speed 3.55 LS
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Old December 15th, 2014, 11:24 PM
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The 302 in my truck is approx 250 horse, and I have not had a problem with the trans, and have a powertrax locker in the rear end, which is rated to 500 hp. There are two different 5 speed trans options offered, and mine was the heavy halfton truck, so I think I have the upgraded one. Would this still be a problem?
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Old December 16th, 2014, 01:08 AM
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What's the TRANS code on your doorjamb sticker? If you have the heavy duty ZF trans, 1st gear is a granny, the Mazda 5 speed is conventional. 5th is overdrive with both. I don't think the ZF was offered in ANY F-150, I believe it was only F-250 and bigger.

It's not the horsepower, it's the torque that's the issue.

Throw the automatic in out of the 351 truck. Can't put the manual behind the 351 anyway without a flywheel swap.

2003 F-150 XL RCSB 2wd 4.2 5 speed 3.55 LS
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Old December 16th, 2014, 01:15 AM
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Find a zf. The only f150 to ever have a zf was in 88 or 89 and it was a RARE option. I only know one guy that has seen one.
You can put the zf in behind any small block 351 included with factory components.
Your current trans is an M5OD-R2 and while it will hold for awhile, it won't be long before it wears out or breaks completely.


1990 F150XLTLariat. 300I6. ZF. BDS. 36x16.5x15FC. SAS under construction.

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Old December 21st, 2014, 11:48 AM
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Ok, so I will start looking for a zf trans. I do not want to run an automatic. But as far as the motor/computer swap, what will I face here?
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Old December 21st, 2014, 04:41 PM
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Use the 88 engine and 92 302 wiring harness. The 88 351 computer should work, if you have it. If not you will need one from a 92-96 truck, it would have to be from a 250 or 350 so you have one with the five speed tune.


1990 F150XLTLariat. 300I6. ZF. BDS. 36x16.5x15FC. SAS under construction.

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Old December 24th, 2014, 11:45 PM
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Thanks Russo. I do have the computer, the 88' pickup is complete. I was able to locate the zf trans, but everyone is pretty proud of them. Best I have found so far is $950. But it's going to be several months to rebuild the 351 with all the parts I want for it. So, your saying I just use the 302 wiring harnes and the 351 computer out of the 88. Will my 92 (302) wiring harness plug directly into the 88 (351) computer?
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Old December 25th, 2014, 02:11 AM
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What engine and drivetrain is the ZF off of? I believe it has to be off a 4wd and a 351 or 300 I6. I don't think one from a 460 or diesel will bolt up.

You can look at it this way - you can get a good rebuilt M5OD-R2 for $950 for when (if) yours goes out.

2003 F-150 XL RCSB 2wd 4.2 5 speed 3.55 LS
  #10  
Old December 25th, 2014, 08:04 AM
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as russo said, use the 92 harnesses. BUT! double check the pin-outs on the wiring harnesses and for the computers... when i did my 302/351 swap, even though they where both 95's the engine harnesses had different pin-outs on the engine harness as the 302 was MAF and the 351 was speed density. i reused my 302's computer as the 302 had a 4r70w transmission behind it, and the 351 had e4od... depending on what all is there, it may be easier to reuse the 302's computer and have a tune done to match the 351... just my two cents...

Aaron

'95 F150 XLT, reg cab long bed, swapped 351w,
4.56 gears, 4-link SAS, 14" coil overs.

SAS Thread!!!

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