Transmission or slip yoke?

[p00tster]

I am having an issue with slippage from a stop and also what feels like a bump from the rear when coming to a complete stop with my 2012 Escalade ESV. I'm trying to determine if it's a transmission issue or an issue with the slip yoke.

If I accelerate lightly from a stop or I ease the brakes to a complete stop, I don't have the issue. It's only when I'm a bit more aggressive with either that I get the symptom.

When I experience the bump from the rear when stopping, I can also hear my RPMs going up slightly and coming back down.

I don't have any fault codes. I also checked the transmission fluid quality and level. No difference in behavior between a cold transmission and one up to operating temp, either.

Any suggestions?

 

[Foggy]

The more common issues are Motor Mounts and Front Differential Mounts being
worn/bad .. I know you say it's more in the rear, but check these items

Make sure you put in your vehicle info in your signature or at least in your post
so we know for sure exactly what you are working on !

 

[p00tster]

Thanks for the quick reply! I'm familiar with checking the motor mounts, but I'll need to look into the diff mounts.

 

[Foggy]

Thanks for the quick reply! I'm familiar with checking the motor mounts, but I'll need to look into the diff mounts.

The left/driver's side motor mount is the first to go !
a lot of info on the front diff mounts too

 

[RST Dana]

I would think slack in the slip yoke equals vibration at some point between 0-60, every time! You can check for play by hand easily.

 

[swathdiver]

It's almost never the yoke or universal joints, it's almost always the driver's side engine mount. Less likely, but happening more as they age, the front differential mounts can lead to some wonky feelings while going down the road.

 

[Joseph Garcia]

As stated above, NOT the slip yoke.

I recommend that you take the truck to a trusted local repair shop, and get the truck on a lift with the wheels off the ground and with someone inside the truck. Put the truck in gear and press the gas pedal a bit, and see if the noise also occurs in the unloaded situation (wheels off the ground). If the noise still occurs, then the Mechanic underneath the truck can go around, with a stethoscope if necessary, and locate the source of the noise.

When I did this, they found that my front differential mounts and bushings were shot.

If you find that the motor mounts are shot, consider installing H3 motor mounts, and you will never change them again.

 

[strutaeng]

A transmission slip would be an increase in engine rpm with a delay in vehicle acceleration. That would be bad sign something is wrong with the transmission.

On some trucks there's kinda like clunk like you describe when releasing the brake pedal. Basically the yoke kinda binds (instead of slipping) on the splines. If you have a zerk fitting (my extended cab truck has a zerk on the 2 piece portion) try lubricating it with a grease gun. You can also remove the driveshaft and grease the splines where it engages in the transmission or Tcase output shaft.

Check the mounts as has been suggested above...

 

[Doubeleive]

I am having an issue with slippage from a stop and also what feels like a bump from the rear when coming to a complete stop with my 2012 Escalade ESV. I'm trying to determine if it's a transmission issue or an issue with the slip yoke.

If I accelerate lightly from a stop or I ease the brakes to a complete stop, I don't have the issue. It's only when I'm a bit more aggressive with either that I get the symptom.

When I experience the bump from the rear when stopping, I can also hear my RPMs going up slightly and coming back down.

I don't have any fault codes. I also checked the transmission fluid quality and level. No difference in behavior between a cold transmission and one up to operating temp, either.

Any suggestions?

any modifications to the vehicle?
have you done the basic cursory inspection? sway bars, end links, air shocks<-- likely blown out if not previously replaced yet.

 

[Eighthtry]

That description is classic of a slip yoke needing lubricating. The giveaway was "If I accelerate lightly from a stop or I ease the brakes to a complete stop, I don't have the issue. It's only when I'm a bit more aggressive with either that I get the symptom."

Lubricate the slip yokes. If that doesn't fix it then start spending money on the rest of the suggestions.

 

[alvocado]

I've experienced the same thing on a 2011 Yukon and it was the slip yoke.