I installed 275/70/16 tires on my truck and ever since then my truck does not down shift when going w.o.t.(trying to pass a slower car or truck) like it used to. i am wondering if anyone has experinced this? and will going to 3.73 gears fix this? any advise will be appreciated.

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99 xlt sc,4.6 2w.d.,gibson catback,superchip,airaid,rsx shocks,hellwig sway bar(soon to be removed),3" front lift.

 

3.73 will raise your rpm back up but not quite that of stock 3.55 and any higher will up rpm too much. Personally I'd do the gear change. Dunlaps?

 

I have a 1997 reg cab 4.6l 4x4 off road pkg. When I bought it it had Cooper Discoverer STT 285/75/16 on it. I didn't have any problems shifting or anything. I do think that it hurt the MPGs pretty bad, I am only getting about 12. Took the Coopers off, sold them and put some less aggressive open country's on and I'll see how they work.

 

Ummm...no. I had smaller tires with 4.10s and my RPM were anything but too high:
https://www.f150online.com/forums/sh...d.php?t=263323
So a search...4.10s on stockish-sized tires are a popular mod.

At any rate, I don't think his tires are that tall. A programmer can take care of your shifting.

The swap to 3.73 is a waste. You'll hardly notice a one-step ratio change...its only like a 5% difference.

4.10s would be a nice performance improvement with no MPG penalty (if dozens of others who have done this mode, including me, are to be trusted).

But I don't think a gear swap is needed if you're just wanting to get your shifting performance back, and are OK with the current performance of your truck.

 

Did you guys realize this thread was started 9 years ago?

 

Yes, and I can't believe he still hasn't posted what his results were

 

nice

 

It was posted in '99 but his truck is a 2001. Crazy ****, yo.

 

he could've changed trucks since he posted this thread... his info would reflect that in any one of his posts.

 

he shouldnt have changed trucks waiting 9 years for an answer. Doesnt anyone have patience anymore

 

I can't stand it when people have no patience! What a doofus!