Trans/center diff issue in reverse

[Death Star]

In reverse, under load, it feels like it's losing drive, and sounds like gears disengaging. Could the transfer case not be fully engaged? This is in high range only, doesn't do it in low. Does not do it when all tires have traction. It only seems to do it when backing up and the rear tires lose traction

 

[dallen341]

What year? I recall '97's having some valve body issue causing noise or slippage (can't recall exact details).

 

[Death Star]

What year? I recall '97's having some valve body issue causing noise or slippage (can't recall exact details).

 

[Death Star]

Sorry, it's a 97

 

[JaketheSSnake]

I have to give my 97 a few seconds to do its thing before any sort of throttle in reverse. Otherwise it sounds like something is trying to eject it's self from the driveline. I'm not sure if it's the valve body issue or something worse. I just can't believe something inside the trans can make my entire truck shake like that without breaking something.

Tldr: Give it a few seconds to adjust when going in to reverse. Problem somewhat solved!

Edit- now that I think about it, easing into the throttle is far more important. That was the biggest issue for me.

 

[ppc]

In reverse, under load, it feels like it's losing drive, and sounds like gears disengaging. Could the transfer case not be fully engaged? This is in high range only, doesn't do it in low. Does not do it when all tires have traction. It only seems to do it when backing up and the rear tires lose traction

The reason there is no issue in low range is because the center diff is locked providing 50/50 front to back torque. This is a classic failure of the front drive flanges.

 

[Death Star]

Wouldn't it do it in forward and reverse if it was bad drive flanges? This thing has only been wheeled once, very gently. If I'm on pavement and put in D or R and floor it, it doesn't do it. If I floor it in the snow or on dirt, it doesn't make any noise, it just spins all four tires.