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Need some GMT800 Gear Swap Advice

WorkingDad

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WorkingDad Enthusiast

WorkingDad

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I have an '07 Silverado Classic, 76k miles.  2WD, 5.3 engine.  Unfortunately I have the 3.23 gears and it's pretty sluggish getting going.  I planning a gear swap and can't decide on which size to go with.  I have 265/70/17 wheels. Don't do a whole lot of towing, but occasionally haul building tools and lumber around.  Mostly short drives back and forth to work, in TN hills.  

 

I had thought of going to 4.10 and getting bigger tires later on (and a higher lift).  I think I'm going to pass on that though, no lift, sticking with the 265s.  So now maybe 3.73 would be better, or 3.90? 

bgbdwlf2500 Enthusiast

bgbdwlf2500

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20 hours ago, WorkingDad said:

I have an '07 Silverado Classic, 76k miles.  2WD, 5.3 engine.  Unfortunately I have the 3.23 gears and it's pretty sluggish getting going.  I planning a gear swap and can't decide on which size to go with.  I have 265/70/17 wheels. Don't do a whole lot of towing, but occasionally haul building tools and lumber around.  Mostly short drives back and forth to work, in TN hills.  

 

I had thought of going to 4.10 and getting bigger tires later on (and a higher lift).  I think I'm going to pass on that though, no lift, sticking with the 265s.  So now maybe 3.73 would be better, or 3.90? 

unfortunately you have 3.23? haha ive got the 3.08s. I have been contemplating the same thing. If you stick with your tire size, 3.73 has always been the best all around gearing for mpg and towing/hauling etc. The 3.42 I think is a good option as well, youll get some acceleration/torque back and still keep a little more mpg than the 3.73. I'm stuck between 3.42, 3.73 and 4.10 and I'm only going to do it once so I haven't pulled the trigger yet. My truck is a Z60 (handling package) so I think it would be a blast to have the 4.10 but don't want to lose more mpg than what I already am having the 3.08 and lugging the engine. mine is a 6 speed so at 90 its turning like 1800 rpm. Also, there are plenty of gear calculators out there online so find one that lets you input your transmission top gear ratio, mph and tire size and it will let you input gear ratios and tell you the rpm at whatever mph you input

WorkingDad Enthusiast

WorkingDad

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3.08 would bog me down sooo bad. This is my first truck, just got it late last year, so I didn’t know to check gearing. I got a pretty good deal on it, so I don’t mind putting some work into it.

Ordered the 3.73 gears :)


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bgbdwlf2500 Enthusiast

bgbdwlf2500

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4 hours ago, WorkingDad said:

3.08 would bog me down sooo bad. This is my first truck, just got it late last year, so I didn’t know to check gearing. I got a pretty good deal on it, so I don’t mind putting some work into it.

Ordered the 3.73 gears :)


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I never would have thought a truck would have 3.08s so it never occurred to me look. my lifted truck with 35s and the 4.8 and 3.42 was less of a dog than this one is. hope you looked into install prices unless youre going to do it yourself. shops charge a ton

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