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Transmission and drivetrain related components. Discuss automatic and manual trans repairs and performance or talk about driveshafts or rear-ends and differentials. Diagnostics of 4-speed, 5-speed, or even 6-speed transmissions.

hypertech shift firmness. yes? no? hypertech shift firmness. yes? no?

i have a 99 sierra z71 5.3 4l60e combo. when i bought the truck the kid gave me a hypertech tuner with it. i have it tuned for 93 octane, the gear ratio and tire size. but i waned to know if anyone knew if changing the shift setting to firm shifts is good or bad for the tranny. its set on right now but it seems pretty harsh. i dont want to replace the ...
Read more : hypertech shift firmness. yes? no? | Views : 23 | Replies : 0

Hard Shift 1-2 and 2-3

OK I tried a search and there were many that started with this topic but zero were resolved - I bought a used Silverado 99 with ~150K and I have been bringing it back from the dead (new water pump, ball joints, wheel brgs etc..) and I was driving home from the campground stopped at the 4 way and when I took off 1,2 was a serious firm bang then 2,3 as well. I took ...
Read more : Hard Shift 1-2 and 2-3 | Views : 87 | Replies : 2

Swapping 09 Drivetrain for 00

My 00 Sierra has 235,000 miles and needs trans work (computer error for 3/4 shift solenoid).

I just came across someone with an 09 engine and trans, same engine size and transmission as mine with VERY low mileage.

has anyone done this kind of swap? While the engine and trans are same model, I am assuming the wiriing is different and I may need a new harness. . .

My truck is 4x4, 5.3 l ...
Read more : Swapping 09 Drivetrain for 00 | Views : 189 | Replies : 2

2014 Silverado Lemon

I bought a brand new 2014 Silverado with the 5.3 engine. It was a really nice truck until I took it in for the overheat recall. After the dealer reflashed the computer, the truck has been possessed. On the way home it lacked power and when driving down the interstate at 70 mph the oil pressure gauge was fluctuating between about a high of 75 psi and a low of 10 psi. Sometimes when driving ...
Read more : 2014 Silverado Lemon | Views : 1296 | Replies : 32

front diff yoke bearing replacing

I just need to know the order of replacing this bearing for my front diff yoke bearing and seal and torqing nut
Read more : front diff yoke bearing replacing | Views : 56 | Replies : 0

Front Diff fluid: 75w-90 or 80w-90??

I am currently running Amsoil Severe Gear 75W-90 in my G80 and need to change it here soon.

I figured I'll go ahead and change out the front fluid as well just for some piece of mind. Can I run the Amsoil 75W-90 in the front as well or should I stick with 80W-90 but go Amsoil so I can have synthetic? I need to order more SG anyways so I'll order anything extra at ...
Read more : Front Diff fluid: 75w-90 or 80w-90?? | Views : 166 | Replies : 2

Which gear ratio to look for

I am in the market for a 5.3 crew cab sierra or Silverado 4wd. I plan to get either a 4" or 6" lift with 33" tires. Would it be best to get one with 3.42s rather than 3.08? I don't want to regear so I'm wondering which choice would be best for power and mpg once it gets lifted. I think the answer is 3.42 but I want to make sure
Read more : Which gear ratio to look for | Views : 294 | Replies : 7

Tow/haul mode

I prefer how my truck shifts when in tow/haul mode as opposed to the regular shift pattern. I like how it stays in first and second gear a little while longer. Just wondering if it damages the truck in any way to leave it in tow/haul mode all the time. Thanks for any input
Read more : Tow/haul mode | Views : 543 | Replies : 15

06 GMC Sierra shifting hard/clunking during acceleration

I have a ’06 GMC Sierra 1500 crew cab, currently 27,000 miles, 5.3, 4L60-E transmission, tow package,3.23 gears, and locking differential. My problem is when up-shifting from takeoff. When making a casual takeoff from a stoplight, shift point around 1400-1600 rpms, the transmission is smooth like butter. When making a little more “spirited” takeoff, shift point around 1900-2100 rpms, it feels as if it’s slipping just a little when it shifts, or like it’s catching ...
Read more : 06 GMC Sierra shifting hard/clunking during acceleration | Views : 201 | Replies : 3

Rear Axle Shaft

I believe my axle shaft to be bent, (passenger side rear).
2010 Sierra 1500 SL 2WD
I am told that I need to order a shaft, bearing and seal for a 8.5" ring gear rear.
Can anyone confirm that it is in fact an 8.5" ring gear for me?
Read more : Rear Axle Shaft | Views : 179 | Replies : 4


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