My neighbor and I are going to the Seattle RV show tomorrow. He is mildly interested in getting his first RV in the near future, perhaps a tent trailer. Naturally, I'm trying to set the hook..It looks like his truck is rated between #7300 and #9300 depending on what what gearing he has. Is there an easy way to determine what diff he has?Thanks,Scott

Used, so the previous owner(s) may have changed out the diff gearsetBest and easiest is to tie a length of string to the U-Joint. Choose the one pointing straight down and roll the vehicle until it is pointing straight downRoll the vehicle one tire rev. Use the valve stem as a markerThen count the whole number of string turns. That will the the whole number...3 turns means 3.4 or 3.7...4 turns means 4.1, etcThen the fraction of a turn will be the rest of the diff ratioRemove the string (have to say this, as assumed they would in past posts and got some PMs yelling at me that I should have said that)

Thx Ben. Yeah, I know we could figure it out but I was hoping the actual number is posted someplace, like it is on Ram's.The truck is bone stock and doesn't have a ton of miles. I think we can safely assume it's orig.

you Can do it without the string, just eyeball the U-JointIsn’t a 2,000 lb rating difference worth it ?

Other than RVers who changes rear end ratios? And darn few of us.

find the axle code on the door jamb sticker and then google it.Here is mine.. It's a 13, but even my 97 had this same tag, just not the same code...Mitch

2005 F150 tow rating | Good Sam Community

12 Replies

ScottG
Nomad
Feb 06, 2020
Thx Ben. Yeah, I know we could figure it out but I was hoping the actual number is posted someplace, like it is on Ram's.
The truck is bone stock and doesn't have a ton of miles. I think we can safely assume it's orig.
BenK
Explorer
Feb 06, 2020
Used, so the previous owner(s) may have changed out the diff gearset

Best and easiest is to tie a length of string to the U-Joint. Choose the one pointing straight down and roll the vehicle until it is pointing straight down

Roll the vehicle one tire rev. Use the valve stem as a marker

Then count the whole number of string turns. That will the the whole number...3 turns means 3.4 or 3.7...4 turns means 4.1, etc

Then the fraction of a turn will be the rest of the diff ratio

Remove the string (have to say this, as assumed they would in past posts and got some PMs yelling at me that I should have said that)

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2005 F150 tow rating

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