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I've been searching and found some good advice on other threads but I wanted to start one myself that suits my needs. I have a 2017 with heavy 35 inch tires. I currently have the 3.31 non limited slip differential. I don't tow, but I do highway driving up a steep grade. Truck downshifts a lot. I'll also will be offroading write a bit with this truck. I was looking to get some 4.56s with trutrac limited slip differentials for both front and rear axles. I need advice, Pros and cons will be much appreciated. Also not sure if adding a limited slip in the front is a good idea. I read somewhere that it's better than having an open ended axle.
Assuming you have the 8.8, they dont make 4.56s. Secondly, you dont need them. I would go with the FRPP 4.10s and call it a day.
Front LSD is fine, but mostly unnecessary unless you spend a lot of time offroad in the sand or mud. Rear LSD is much more usable and worth the extra money IMO, especially since you dont have the factory locker. But I'm not sure they are making any aftermarket differentials for the new 8.8 yet (since they aren't making any gears yet either).
Right now, you are probably limited to just open diffs and 4.10s, unless you tried to add an OEM locker. Its kind of annoying but you can also just drive the truck manually in 8th so it stops most of the shifting.
Assuming you have the 8.8, they dont make 4.56s. Secondly, you dont need them. I would go with the FRPP 4.10s and call it a day.
Front LSD is fine, but mostly unnecessary unless you spend a lot of time offroad in the sand or mud. Rear LSD is much more usable and worth the extra money IMO, especially since you dont have the factory locker. But I'm not sure they are making any aftermarket differentials for the new 8.8 yet (since they aren't making any gears yet either).
Right now, you are probably limited to just open diffs and 4.10s, unless you tried to add an OEM locker. Its kind of annoying but you can also just drive the truck manually in 8th so it stops most of the shifting.
If I'm not mistaken, I have the 8.8 front axle and the 9.75 rear. G2 has the 4.56 front ifs for my front differential I think. Wow. I think I need to research more. Thanks for the reply
Ok. Assuming that I have the 9.75 rear axle. i'm traveling uphill on highway at 65 mph. my truck constantly downshifts in order to keep that speed. Truck really bogs down. I have a 6 inch lift with heavy 35inch tires. I'm definitely putting the front and rear LSD. i'm still debating on the 4.10 or 4.56 gear ratio. The cost between the two is negligent and the labor is still the same. What would be more useful in my case? Thanks again guys for all your help
I would think that 4.56 would be overkill. 4.10 seems a lot better. I'm kinda shocked actually because with a 10sp transmission I wouldn't think gear ratios would be that big of deal but I could be wrong. Kinda shocking when only 10 years ago most trucks were running 4 speeds and gearing made a HUGE difference.
Found this on another forum and something to consider is your total gear reduction with the 10sp and 4.10s/4.56s since you do a lot of highway driving. This is a calculation someone put together to compare the total gear reduction between 6spd and 10spd and rear gears.
With 4.10s, your 10th gear would be about 8/9th gear with 3.31s and with 4.56s, your 10th gear would be about 8th gear with 3.31s.
07-27-2017, 10:32 AM
10 speed gear ratio for 35 inch tires
