3:55 to 3:92 rear upgrade
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Joined: Oct 2011
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3:55 to 3:92 rear upgrade
I know there are a lot of posts on here regarding rear end upgrades and I have been doing a lot of research. Is thier anyone out there who has done it and is happy/unhappy?
I have a 2011 1500 2WD CC Bighorn with 3:55. I have been towing a camper for the last 3 years and recently upgraded. Ofcourse a little bigger and a little heavier. Trailer is 6600 pds dry and 36' long. I am 600 pads heavier and 5' longer than my last camper. Even at max trailer weight I am still under max towing of 8550. I'm just a little more nervous with this trailer and wondering how the upgrade to 3:92 would help. I do have the Airlift Air bags and compressor installed. Thanks in advance for any help.
I have a 2011 1500 2WD CC Bighorn with 3:55. I have been towing a camper for the last 3 years and recently upgraded. Ofcourse a little bigger and a little heavier. Trailer is 6600 pds dry and 36' long. I am 600 pads heavier and 5' longer than my last camper. Even at max trailer weight I am still under max towing of 8550. I'm just a little more nervous with this trailer and wondering how the upgrade to 3:92 would help. I do have the Airlift Air bags and compressor installed. Thanks in advance for any help.
Professional
Joined: Oct 2008
Posts: 235
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From: Acton,Ontario
Well the 3.92 would help, to justify the cost vs performance it would not be worth it at all..
If your going to go into the Diffs you may as well get 4.10's.. same cost
and would make more bang for buck. Going 4.56 would be over kill for what im assuming is a daily driver.. and occasional tow vehicle..
3.55 vs 3.92 = 10% more revs/torque
3.55 vs 4.10 = 15% more revs/torque
If your going to go into the Diffs you may as well get 4.10's.. same cost
and would make more bang for buck. Going 4.56 would be over kill for what im assuming is a daily driver.. and occasional tow vehicle..
3.55 vs 3.92 = 10% more revs/torque
3.55 vs 4.10 = 15% more revs/torque
Professional
Joined: Dec 2014
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As pointed out, 3.92 will give you approximately 10% higher revs at the same speed/gear. It's not much, but then again you're not pulling much more. In fact, it's about 10%. Assuming the torque curve in the RPM range where you're pulling is fairly flat, 10% RPM increase will give you 10% more HP, so you would have about the same practical power as you have now.
That said, I agree that if you're going to the expense you may as well make it really worth your while and put at least 4.10s in. If it were me I'd go with 4.56s but I don't care too much about mileage and I have the 8 speed so top gear is pretty low. I got 3.92s in mine because that's the lowest gear the factory offers.
That said, I agree that if you're going to the expense you may as well make it really worth your while and put at least 4.10s in. If it were me I'd go with 4.56s but I don't care too much about mileage and I have the 8 speed so top gear is pretty low. I got 3.92s in mine because that's the lowest gear the factory offers.
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Joined: Jul 2011
Posts: 303
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From: Texas Yall
The final gears in the 8 speeds are 0.67 which is crazy high, I have 3.55s in my 2014 and i hate them. My old truck had 3.92 and the 20 in rims and i still felt that it had no power either. Its all a personal preference on how you like your truck to drive. Not to count the lower your ratio the more ECO mode stays on.