Problem with lift

[buffcc1]

Hey all I just put a 6in lift on my 84 k-5. The problem I am having is when I am going highway speeds(45 and over) When ever I push in the clutch or start to slow down the area around my transfer case starts to put out a god awful grinding noise. I installed a transfer case drop kit, I also cut away where my front driveshaft was hitting my transfercase mount. I spent about a half an hour sitting under my truck but I cant see any evience of grinding. Can anyone help? By the way anyone who is thinking about doing a 6in lift or higher be ready for problems(but it does look freakin sweet!!!!!)

 

[89GMCSuburban]

Check your u-joints

 

[buffcc1]

how?

 

[resurrected_jimmy]

crawl under truck, grab drive shaft and twist (put brake on), you are seeing if the drive shat has a lot of slop in it, if the shaft moves around and doesn't feel tight something is worn out

 

[buffcc1]

DOne feels fine

 

[MTMike]

Mine did that with 12" of lift. When I took out the 12" lift and put in ~5" lift it went away. It is a driveline angle problem.

Mike

 

[resurrected_jimmy]

what t-case do you have?

 

[89GMCSuburban]

When is the last time you greased them (or changed them)? They can make noise and have no play, I've seen it before. The caps will dry out and start galling.

If it is drivline angle, that's pretty severe. You say it happens when you slow down or press in the clutch. Unless you downshift to slow the truck down, it would be making this noise more often. Letting of the gas usually isn't enough to make the pinion angle become so severe that it makes the u-joints max out. Just in case, check the yokes for signs that the yokes have been touching from extreme angles.

 

[4wheelin4Jesus]

stupid question, but did you get an alignment after you lifted it?

 

[resurrected_jimmy]

I had a slip yoke strip and sound like this once..... it would only do it when I would coast