I gave a 97 Tahoe and every time I stop then let go of my brakes the rear ends drops and clunks but if I put it in neutral rite before I stop it won't any suggestions

 

hard to tell from the discription, I fear the rear end may be going out, but start with the simple / cheap/ easy stuff. check your U Joints, see if they have some play or slop in them, maybe thats where the clunking is coming from!

 

Are you sure it is the rear end clunking?

What transmission do you have?

Is there a transmission mount? Is it ripped or broken in pieces??

 

That clunk is the slip yoke.... you need to have the slip yoke lubricated...

 

does it do it if, say you are going 30-50 and downshift? then hit the gas?

check the rear driveshaft for play or worn out U-Joints.

or could be the rear ring/pinion, but I think the U-joints are more likely...

 

No it only does it After I stop then drive away again all the u joints seem ok. The rod that attaches to the u joints towards the fronts move a little bit left to right not sure if that's normal?

 

What is the slip yoke?

 

'towards the front' you mean the transfer case? (4x4) or transmission (2wd)?

a slip yoke slides in/out of the output of the engine side, so you don't need a driveshaft that can slide. it's a cheaper way of making the products... in the off road world it's one of the first things to go when you need a lift kit...

Reduce GMC Sierra Drive Shaft Clunk - Slip Yoke Grease Fitting Install - HOW TO - YouTube

shows you some what, what it is, and yes, if it's moving side to side, I would call that abnormal... or most likely worn out.

 

Excellent idea, I would add though that the grease recommended by GM is listed below, he did not specify what grease he was using in the video and I don't think you want to use just standard wheel bearing grease...

Genuine GM Fluid 19257121 High Temperature Special Lubricant

Details:
High-quality
Contains PTFE
Multi-purpose grease
Non-melting
For use on gears, slides, bearings, cams, and prop shaft splines

 

not sure if it's in the video, but chock the wheels BEFORE removing any driveshaft.

if you only use Park to hold the vehicle, and remove the rear driveshaft... your truck will roll free.

Setting the e-brake should hold it, but for the 30 seconds it takes to block the wheels, and not end up in the hospital or dead... please secure the vehicle.

I also don't like the rust that covers most of the underside of vehicles, so I rust stop gloss black nearly everything on the underside... just my OCD