'99 F-550 Gearing question - Ford Powerstroke Diesel Forum
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Old 01-19-2014, 07:39 PM
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'99 F-550 Gearing question

Ok, I took an F-550 that was used by AGWAY as a sprayer unit. It had a 500+ gallon tank and spray booms mounted on the back. It also had 11-22.5 rims and tires mounted on it.

7.3 Diesel 4x4, 6-speed, 4.88 gears.



Turned the truck into a Hot Shot truck. With the proper size tires, it now is geared way to low. It runs 65mph at 2500rpm in 6th (OD) gear. What gear set should I go with to actually be able to run at highway speeds without scattering the motor??



Thanks
Marc M

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Old 01-19-2014, 07:51 PM
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4:10 all the way
By the way, nice conversion! That truck looks great compared to before

Last edited by CILcoalroller6.4; 01-19-2014 at 07:58 PM.
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Old 01-19-2014, 07:57 PM
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IIRC 4.88 and 5.13s were the only 2 gear choices for the Dana 130 rear axle in the F550. That is 1/2 the reason for the 18k gvw
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Old 01-19-2014, 08:02 PM
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He needs to do a Dana 80 axle swap then switch to 4:10 is what I mean. You can get one from an F350 at a junkyard.
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Old 01-20-2014, 12:45 AM
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Honestly a GV unit or similar would be better being as a Dana 80 rear would decrease the gcvwr as well as the gvwr, why would you want a smaller load rating by going down in axle size?
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Old 01-20-2014, 04:14 AM
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Quote:
Originally Posted by CILcoalroller6.4 View Post
He needs to do a Dana 80 axle swap then switch to 4:10 is what I mean. You can get one from an F350 at a junkyard.
Why would he want to put a Dana 80 in place of the Dana 130? Talk about going backwards
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Old 01-20-2014, 01:14 PM
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Wasn't sure if you could put 4:10s in a 130 and I know you can in an 80. He wants to run at lower RPMs and the only way to do that is to raise the ratio.
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Old 01-20-2014, 06:23 PM
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Or add a gear vendor , or taller tires, there are a few things, but I wouldn't want to sacrifice gross weight load for a better hwy gear
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Old 01-20-2014, 06:33 PM
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It really just depends on what he wants to use the truck for. Right now the truck probably gets 6-8 mpg and the engine is winding that high of RPMs, which is not good and definitely a killer on your motor going highway speeds. If he plans on using the truck as a DD or a medium weight tower (around 10,000 lbs), then he needs higher gears. 4:10s are what most 350s use-IDK if 550s ever had them or not, and I think they would match his criteria. But I have no f'ing clue how to do a gear swap or if he needs a different axle.
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Old 01-20-2014, 06:38 PM
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Does the legal portion of the truck change if the axle is switched out?

I know a lot of states are far different then other ones when it comes to towing laws. Some its only what the factory said for that year and nothing else, others as long as you got the money you can have whatever you want within reason and your vehicle class.

So I guess if his state only goes by what the door tag says, does it matter if the axle is swapped? To me if they were so strict that it has to have that exact axle and they would check that, then simply changing the gear ratio from the factory one would be enough to make it illegal as well.

I guess just depends on how strict the state is?
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