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wanting some opinions on a 91 F150

 
  #1  
Old 08-19-2009, 06:01 PM
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wanting some opinions on a 91 F150

I currently have a 79 F150 4x4 longbed, 351m, auto. (gas guzzler) I also have an 86 thunderbird with 289hipo, c4 trans. but the trans. needs work.

A friend wants to trade me his 91 F150 inline 6, 5spd. and a spare c5 trans. for my 79 truck.

I'm seriously considering the trade. As far as I know the only problems with the truck are, the a/c needs charged (as far as we know thats the prob.) and it needs a new fuel sending unit. The body is a little banged up but nothing I cant live with till I can fix it anyway.

my questions are, what should I be weary of? what kind of problems should I check for? how much is it to check/charge an a/c system? etc.
 
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Old 08-19-2009, 06:09 PM
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the a/c will be nearly impossible to recharge as is (r12) unless it had been converted to R134 at some point. You'll need to have it converted over, not to hard to do yourself by the way.

Since you are in OH, I would check the undercarriage over for rust problems.
The engine is a real workhorse, not a racer, it will probably outlive the truck. LOL
 
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Old 08-19-2009, 06:11 PM
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anyone know how to do this?
 
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Old 08-19-2009, 08:38 PM
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any other things to look out for?
 
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Old 08-19-2009, 10:28 PM
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Rust, M5ODs that are sloppy should be carefully considered/repaired to remove the sloppy shifter (couple of pins in the shifter), Leaking M5ODs (see previous), Rust, 8.8 rear can wear grooves in the axle at the outer bearings and seals that can be easily repaired with a repair bearing or new axle shafts, High Idle conditions, and pull the codes from the truck computer. Otherwise, it will suffer the same issues you would have experienced on the 79 just more wires to deal with is all.

Why would you want a C5, the C4 was a far better trans and it didnt have a questionable lockup clutch in the torque converter that may or may not work.
 
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Old 08-19-2009, 10:41 PM
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Well, the c4 isn't working, but the c5 is.
 
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Old 08-20-2009, 07:58 AM
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As far as i know you actually don't have to do the r134a conversion just stuff r134 in there friend of mine had taken a auto hvac class and they told him that there really is no diffrence. and when he went home he check his 87 mustang and made sure it was empty and recharged it with r134a and it's cold as ice, all without converting anything just making sure what was left of the r12 was gone first.
 
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Old 08-20-2009, 10:12 AM
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ok what kind of engine/drivetrain issues did these trucks have?
 
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Old 08-20-2009, 04:17 PM
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Just the M5OD needs more attention than most transmissions to last, but it will last if taken care of. The Rear axle outer bearings have a race that is the axle shaft, which can wear enough to cause leaks. The 300 I6 hasnt changed much internally, but received a serpentine belt system and fuel injection. Not really much has changed when compared to your 79, except for the TTB front axle that has more pivot points (if it is a 4WD truck).
 
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Old 08-20-2009, 05:16 PM
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I've owned my 91 150 for a little over 2 years now and I'm proud to say it's been a damn good truck to me. At just under 140k I've yet to do any major mechanical work to it.

But then, I think it's had a good maintenance history- it was a farm truck at one point. When I lift the rubber mat on the bed floor I can see where the holes had been drilled for a 5th wheel. It had about 100k when I bought it and I'm the second owner, so if it put up with 100k worth of pulling and it's in good shape, I think that's something worth mentioning.

But again, I think it's had a good maintenance history- I can't see it being in this good of shape otherwise.

Give the truck a good once over, make sure to test drive it and go from there. From my experience and the experience of others I know who have owned 150's of the same year, they're great trucks mechanically- body wise, maybe not. I don't know for sure.
 
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Old 08-20-2009, 05:19 PM
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i think you would regret it later...he brought up the trade means he knows something plus that 79 is a nice truck as for the busted tranny you have look around alot of places will give you a great price on a rebuilt one when you give them your old one
 
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Old 08-20-2009, 11:03 PM
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i say if you trust him enough that he wont screw you over, go for it. i have a 1995 f150 with 188,000+ miles on it and it runs better than most newer trucks. it has been in my family since my uncle bought it new so i know it was taken care of. i got run off the road by a drunk drive. i was doing 45 and hit a culvert. the only damage to the truck: front bumper was screwed, new tierods, new passenger side I-beam and radius arm+mounting bracket ($100 from a junkyard). that engine is an absolute beast, lots of low-end torque (rated from the factory at about 250 lb-ft). with regular upkeep and some TLC it will def outlast the truck.
 
 
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