differential change
Soon I hope to change the differentials on my 2004 f350 V10 4X4. It came stock with 3.73 gearing. Now we are pulling a 5er that weighs about 11,000lbs. This setup pulls the 5er just fine here in flat-...
Forum Discussion
Some things with the Excursion V10 and gearing. I agree that you would be better off with 4.30 or 4.56's.
The V10 with 3.73 in the rockies will have dead spot, really bad when pulling a 6% grade. I find it is a very dangerous undertaking in that regard.
The V10 is a Cammer engine so it likes the RPM's, towing will hit the dead spot in the gearing.
Also, you should not be running 89 octane in that engine, it will detonate very bad. "PLEASE NOTE, Depends if using Ethanol blend or not". On the west coast 89 octane is not good on the V10 when placed under a load. The engine will detonate activating the knock sensor which will then retard ignition thus decreasing power.
The 4 cents or even 10 cents per gallon difference over a 40 gallon tank isn't worth blowing a hole through the piston.
Also, with premium the MPG's will increase by 2mpg even towing.
My v10 around town with winter blend premium Costco gas was 12mpg and 17hwy, 3.73 gears. Towing 8.8K pound trailer was 9mpg. When I did run regular it was 7mpg.
The V10 with 3.73 in the rockies will have dead spot, really bad when pulling a 6% grade. I find it is a very dangerous undertaking in that regard.
The V10 is a Cammer engine so it likes the RPM's, towing will hit the dead spot in the gearing.
Also, you should not be running 89 octane in that engine, it will detonate very bad. "PLEASE NOTE, Depends if using Ethanol blend or not". On the west coast 89 octane is not good on the V10 when placed under a load. The engine will detonate activating the knock sensor which will then retard ignition thus decreasing power.
The 4 cents or even 10 cents per gallon difference over a 40 gallon tank isn't worth blowing a hole through the piston.
Also, with premium the MPG's will increase by 2mpg even towing.
My v10 around town with winter blend premium Costco gas was 12mpg and 17hwy, 3.73 gears. Towing 8.8K pound trailer was 9mpg. When I did run regular it was 7mpg.
