I have a 1995 F-150 with a 5spd and in 5th gear at 60 mph I'm just over 2k on my tach. Should I change my rear gears to 4.10 to get my RPM's down? Or would this make much change? Or would there be a downfall elsewhere?

I believe I have 3.55's in there now.

Checking Summit I see other gears such as 3.73, 3.90, 4.30 and 4.56's

Cheers

 

Your RPMs would go up. There would be no advantage at all. All depending on how you use the truck, but 3.55 should be pretty good overall.

 

Unless your gonna be running bigger tires, your fine with 3.55s

 

With an I6 under the hood 3.55 gears is just about perfect for overall performance and towing, if you want to improve milage some just fit larger tires since the stockers look goofy anyway, but remember to recalibrate the speedo or you won't see the milage gains and may even see losses. 32's fit without any mods while 33's may require a levelling kit.

 

I have 31 inch tires and factory 4.10 and I also tach at 2150RPM @60 MPH.

I test drove 3.55 and my 4.10 geared F150s with the 5.0 when I was looking to buy several years ago------- and there is just no comparison between the two. 4.10s are great for pulling and acceleration!

There is about a 200 RPM difference at 60 MPH between 3.55 and 4.10 gears in overdrive. 4.10 makes the first gear of the M5R2 more of a granny first gear. I am able to turn thur city intersections in fourth gear with the truck unloaded.

You will be able to reprogram the speedometer yourself electronically without expense. See this:https://www.ford-trucks.com/article/...ND_BRONCO.html This works very nice--I did it when I changed from 235/75 x 15 to my 31 inch high tires.

But you will only need to change the speedo calibration if you change the height of the tires-changing the axle ratio will not change the speedo reading. Because the VSS is located at the ring gear at the axle--not the tranny.

 

That's a different animal though, the 5.0 needs 3.55 gears minimum just to be usefull while that's about the maximum I'd suggest for a 4.9 truck since that motor makes no topend power.

 

Closer to a 400rpm difference between 3.55 and 4.10

 

Thanks a buch fellows!!
So in the end result I shouldn't swap out my gears just to bring the top end RPMS down.

Or if I don't already have 355's then I could install them and install bigger tires next time.

 

Just to be clear you would have to go to a numerically lower gear(3.31, 3.08) to achieve a reduction in rpms, that could easily cost $500-800 per axle which will take a long time to recover from fuel savings.. if in fact you save gas at all, that's not a certainty but what is certain is that the truck will lose towing capacity.