1989 f250
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Senior User
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From: Hamilton Ontario
1989 f250
351, (5.8L) , trans. code "k" ,C6? , rear end 29 , 3.55?
Regular cab , longbed. What kind of trailer weight can I tow?
Can anyone confirm the trans. and rears?
Cheers ,
Sty
Regular cab , longbed. What kind of trailer weight can I tow?
Can anyone confirm the trans. and rears?
Cheers ,
Sty
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Joined: Dec 2002
Posts: 3,959
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From: USA
"29" is a 3.55 open diff 5300 lb Ford axle (possibly a 10.25" semi-floater?). Don't know on the trans code. If the trans is an auto without overdrive (3 gears), it's a C6. If it has overdrive, it's probably an E4OD. The E4OD will have an overdrive lockout button on the end of the column shifter. If it's a 5 speed manual trans, it's likely a ZF.
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From: USA
As for towing the trailer, the truck will tow it. It won't be fast going up hills with the high gear ratio, but it will get the job done. Your GCWR (max rated weight for truck and trailer combined) should be about 11,500 lbs with 351/3.55 gears and an automatic. Figure your truck weighs 6000 lbs + your 5500 lb trailer = 11,500 lbs, right at the limit.
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From: Hamilton Ontario
Thank you gentlemen!
Funny...My 92 F150 302 E4OD 3.55 LS 155" WB also has a GCWR of 11500#. Pretty scary when you think about the difference in the brakes and suspension. Just bought the 250 this morning , after towing this trailer home yesterday with the 150. It was against my better judgement, but did it anyway, less than 5 miles. Even with the electric brake controller , the truck seemed to handle the trailer OK , but even the slightest grade seemed to make the truck work hard. After this , I realized that a 3/4 ton was the way to go. So I should notice quite a difference in power , just a little slow go up hill?
Thanks again guys
Peter (Sty)
Funny...My 92 F150 302 E4OD 3.55 LS 155" WB also has a GCWR of 11500#. Pretty scary when you think about the difference in the brakes and suspension. Just bought the 250 this morning , after towing this trailer home yesterday with the 150. It was against my better judgement, but did it anyway, less than 5 miles. Even with the electric brake controller , the truck seemed to handle the trailer OK , but even the slightest grade seemed to make the truck work hard. After this , I realized that a 3/4 ton was the way to go. So I should notice quite a difference in power , just a little slow go up hill?
Thanks again guys
Peter (Sty)
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From: USA
Well, I don't know that you will notice 'quite a difference in power' between your F150 302/3.55 and your F250 351/3.55...
Yes you have a more powerful engine in the F250 but the F250 is also heavier than the 150 and both have the same gear ratio, but actually the F150, if the tires are stock size on both trucks, has smaller dia tires, which means that the F250 has a higher (numerically lower) Effective gear ratio, so less torque multiplication is done. That is likely why the GCWR of both trucks is the same. GCWR is more of a power thing than a suspension/chassis thing, to an extent.
The benefit of the F250 for trailer towing is it's larger brakes, heavier suspension, stronger and longer lasting axle, and it's heavier weight. A heavier tow vehicle handles a trailer better than a lighter one, except for needing more power to overcome that weight.
For greater towing power, switch to a lower (numerically higher) gear ratio.
Yes you have a more powerful engine in the F250 but the F250 is also heavier than the 150 and both have the same gear ratio, but actually the F150, if the tires are stock size on both trucks, has smaller dia tires, which means that the F250 has a higher (numerically lower) Effective gear ratio, so less torque multiplication is done. That is likely why the GCWR of both trucks is the same. GCWR is more of a power thing than a suspension/chassis thing, to an extent.
The benefit of the F250 for trailer towing is it's larger brakes, heavier suspension, stronger and longer lasting axle, and it's heavier weight. A heavier tow vehicle handles a trailer better than a lighter one, except for needing more power to overcome that weight.
For greater towing power, switch to a lower (numerically higher) gear ratio.
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From: Hamilton Ontario
Thanks again SoCalDesertRider.
BTW the GVWR of the 250 is 7700#.Yes , it is a 3 speed without OD.Must be a C-6 then?
TYVM
Peter
BTW the GVWR of the 250 is 7700#.Yes , it is a 3 speed without OD.Must be a C-6 then?
TYVM
Peter
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