changing gears 3.55 to 4.10 2010 f250

[TD-5]

After a gear change from say 3.55 to 4.10 or 4.30, is there a parameter in the ECM/PCM that needs updated so it recognizes the new final drive ratio. We can correct for tire size thru the H&S programmer or MCC but there is nothing for gearing.?

 

[Jesse_01]

After a gear change from say 3.55 to 4.10 or 4.30, is there a parameter in the ECM/PCM that needs updated so it recognizes the new final drive ratio. We can correct for tire size thru the H&S programmer or MCC but there is nothing for gearing.?

I asked a few programmer's and they said no you don't have to reprogram anything.

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[Martin #6]

3.55's to 4.10's

3:73 is the happy medium imo. you will run out of rpm with 4:10s and use a ton of fuel.

I'm thinking of doing this gear swap also. Looking at a gear ratio calculator I'd be at 1866 rpm's doing 65 mph with my 34" tires. Do you think these rpm's are too high for sustained hwy driving and towing a 12k 5th wheel? Also will this range of rpm's increase my chances of water pump cavitation that I should be concerned with?

 

[sootie]

I'm thinking of doing this gear swap also. Looking at a gear ratio calculator I'd be at 1866 rpm's doing 65 mph with my 34" tires. Do you think these rpm's are too high for sustained hwy driving and towing a 12k 5th wheel? Also will this range of rpm's increase my chances of water pump cavitation that I should be concerned with?

negative on both fronts. do it.

 

[drunk on diesel]

if anybody wants to swap 3.55 axles for 3.73's, I'd love to do so. I put shorter tires on my reg cab and would like some more gear

as long as your coolant is good and you've got the updated degas setup, I wouldn't worry about cavitation