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Ok first I want to apologise if this thread has been done. I just started my account today. So I bought a 2016 Silverado 1500 LT Z71 4x4 with 37k miles a few days ago. It has a 5 or 6 in RC lift and 35x12.50r20 MasterCraft courser MXT tires on it. And the Hostile predator wheels. My question is, I don't know if the truck has been geared. Tuned. Or calibrated by the previous owner. The dealership doesn't know. The truck doesn't feel "sluggish" to me personally. I drive past the digital speed trap in my town and if I'm doing 30 on my guages the reader says 31-32... On the highway at 70mph my tach reads the notch under 2k.. so 1800?.. when cruising at 30-35 my tach reads around 1100-1200. I find I get in town with A LOT of stopping and going around 13mpg and that's driving very conscious. I notice it shifts around 2500 and then lower in the higher gears like 2000 then 1500.. but seems to chug along nicely around that 1200 mark. Also. My V4 mode has never turned on once. Not sure if that's due to the current cold northern Ohio climate right now. Or if the previous owner has a tune on it and disabled that feature. I just don't want to spend the money on a tune and calibration if I don't have to. When I floor it it gets up and goes fast imo. I don't floor it often at all. It doesn't pull or tow or haul much. I'm a maintenance engineer in a flat Ohio town of 50k ppl. So I don't think I'll regear because it won't be working too hard. If I could get some folks to shed some light on my curiosity I would greatly appreciate it. If all else fails. I'm buying a good tuner I guess... Thanks guys.

I decided it was time to swap gears up to 4.56's. My Silverado is lifted 15" on 37" tires with stock 3.42 gears. I did a few mods squeeze a few more horse power and torque, but after towing my travel trailer for a few months I realized it's time for an upgrade. These are 4.56 Nitro Gears from Summit Racing... I will be installing these myself this weekend.

Got a 1993 G20 Chevy Sports Van. She's a 5.7 V8 704r. So this was part of the seller's inheritance. She sat for almost one year and prior to owners death, had no Transmission issues. She drives in Neutral and has 0 ZERO Reverse. Like no bucking or any other sensation when it's in reverse. Her trans fluid was dark. I had all fluids changed today and asked the mechanic what he found in the transmission pan. He said there were a few shavings and the fluid was dark but that was it. He told me he was no Transmission guy but really felt like I did not have a transmission problem. The car acts like it has no reverse at all. I was told by a transmission guy to Rev it up a bit after warming it up. If the front clutch in the transmission is stuck together, I should feel it buck like it wants to go into reverse but it can't. I GOT nothing in reverse period. It drives in Neutral which the mechanics that did the fluid changes said they have never seen. Sooooo...do I have a transmission problem, a shift solenoid problem, some sort of cable that's come undone....detent, TV ? My fear is that this is something less expensive than a transmission rebuild and I don't know enough to know what it is ? What do you guys think ? For the record....after all the fluids were changed, it drove like a million bucks !