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tire size/gear ratio

 
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Old 09-17-2018, 03:20 PM
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tire size/gear ratio

I just purchased a 1990 F250 with a 7.5 motor and auto 4e0d transmission. I live in NY and bought this truck online from Washington State. The truck is lifted 6 inched and has 35 inch tires on it with 4:10 gears. I was admiring this beauty when my son said that it may burn up the transmission trying to pull my 20foot enclosed trailer I use to haul my 1940 Ford pickup to some shows. Then I realized that the tires will change the gear ratio but is it too much?
 
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Old 09-17-2018, 03:25 PM
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Try it and see how it does, also add a trans temp gauge. The 7.5 is a big engine so 35s with 4.10 gears may not be too bad.
 
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Old 09-17-2018, 03:32 PM
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What temps should I consider safe
 
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Old 09-17-2018, 03:51 PM
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I'd suggest adding a trans shift kit, an aux trans fluid cooler and a temp gauge to monitor it. Heat kills an auto trans and these early copies are known for brutally lazy shifts which builds heat and wears out components.
 
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Old 09-17-2018, 05:41 PM
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Originally Posted by JonC12345 View Post
What temps should I consider safe
220 is about the maximum
 
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Old 09-17-2018, 08:11 PM
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I tow with 38s on my f350,I think you'll be fine.
 
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Old 09-18-2018, 07:11 AM
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Thanks to everyone for the responses, I don't plan on driving this truck through the NY winters and salt so I will have time to put a gauge on and see this spring. Thanks again Jon
 
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Old 09-18-2018, 09:55 AM
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Make sure you take the trans out of OD when towing
 
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Old 09-18-2018, 11:55 AM
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Originally Posted by Diesel_Brad View Post
Make sure you take the trans out of OD when towing
There is no problem with towing in OD as long as it isn't constantly shifting back and forth.
 
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Old 09-18-2018, 08:13 PM
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Originally Posted by 00t444e View Post
There is no problem with towing in OD as long as it isn't constantly shifting back and forth.

With 35s, that is all it is going to do is shift in and out of OD. So like I said, take it out of OD
 
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Old 09-18-2018, 09:09 PM
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Originally Posted by Diesel_Brad View Post
With 35s, that is all it is going to do is shift in and out of OD. So like I said, take it out of OD
Going 75 MPH in OD with 35s and 4.10s would put you at about 2100 RPMs, a healthy 460 should be able to tow 6-7K at that RPM on flat land.
 
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Old 09-19-2018, 05:21 AM
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Originally Posted by 00t444e View Post
Going 75 MPH in OD with 35s and 4.10s would put you at about 2100 RPMs, a healthy 460 should be able to tow 6-7K at that RPM on flat land.



Maybe you have never been to NY. There are way more hills than flat land
 
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Old 09-19-2018, 05:54 AM
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Originally Posted by Diesel_Brad View Post
Maybe you have never been to NY. There are way more hills than flat land
No I have never been there, but I live in the middle of appalachia, plenty of hills around here, the OP didn't state where he lived.
 
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Old 09-19-2018, 06:53 AM
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Originally Posted by JonC12345 View Post
What temps should I consider safe
250 on down is fine for a transmission that's working hard so long as you kinda sorta change the fluid on time. Don't worry about the occasional spike to 280 while pulling a hill. High temp primarily affects the longevity of the fluid and rubber components in the trans. You need to get really hot before friction components start to care.

Originally Posted by 00t444e View Post
220 is about the maximum
Do you run a 160 tstat and start worrying when it hits 180? There's no harm in running at 220 but it's a stupidly conservative limit for a truck that's working hard.

Originally Posted by 00t444e View Post
No I have never been there, but I live in the middle of appalachia, plenty of hills around here, the OP didn't state where he lived.
So then you should know better than to say a 460 truck with 4.10s is only good for 6-7k on flat ground. I wouldn't think twice about putting 6-7k behind my F150 with a 300 in Vermont or New Hampshire.



 
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Old 09-19-2018, 06:59 AM
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OP did say NY.

Yes, a little common sense. If you're on a grade and the trans is right between 3rd,4th,kick it out of OD. Flat ground leave OD on.
 

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