I have a 2008 1500 with a 3:42 w/G80, anti drum brakes. I want to go to 3:73 rears. The diff had the spacer break and cause case and bearing damage. I changed the bearing and re shimmed. I want to replace the entire axle with an 3:73 ratio. I was wonder what years models will be an direct swap. Will some earlier years work??
I have an open end rear differential. I was wondering if I could switch out some gears so I could have a locking rear end, or would I have to get a whole new rear end? I have a 2001 GMC Sierra 1500 SLT 2x4 5.3 Extended cab, if that helps for you specificity oriented people.
I’ll try to keep this short and sweet.
I have a 2014 Sierra 1500 4x4 (Crew Cab, SLT, Z71, blah, blah, blah) with 3:42 gears.
I’m running stock rubber. 275/55 R 20. I believe these are 31.9 inch tall tires.
My plan is to lift my truck and tune it as soon as I hit 36,000 miles. I want to run 35’s after I get my 6 inch lift installed.
I found this calculator. http://www.4lo.com/calc/geartire.php
I’ve been pretty obsessed with it and the numbers it’s giving me since I found it.
If I want to run a 35 inch tire, my current tire size is 31.9, and I have 3.42 gears front and rear, to keep the same gear ratios, I’d need a 3.75:1 axle ratio. Which is pretty close to 3.73. Catch my drift?
I know I’ll never get the acceleration and fuel economy back after taller and heavier tires, but shouldn’t my truck be pretty close in drivability and at least in the same ball park with stock fuel economy and acceleration if I were to install some 3.73 gears at the same time as I installed the tires?
Someone out there has to have done this same swap with this setup.
Just curious about the results.
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