Hummimg sound when decelerating ?

[PK]

If there is any difference in diameter between your real tyres and the small spare, then the small spare should only be fitted on the front. The limited slip diff is too tight to run uneven diameter tyres on the rear.
Also, the small spare wheel is deliberately set up out of balance, so that you can only drive at around 15 - 20 MPH. This is a safety thing, so that you stay within the limits of the smaller tyre.

I would suggest you have damaged the rear suspension and/or differential. If you take the vehicle to a good mechanic together with these comments, they should be able to find the damage and repair it.


PK

[VXDAD]

Hey PK, Thanks for the info. I think it my be in the rear diff. also. Last week checked and replaced the cv axles because my boots were torn , it wasn't those humming. Yesterday I cranked the t bar and got 4in. lift in the front. I also put ome 919's on the back with Dayton 1.5 spacers along with old spacers and got 4in. lift in the back. all the suspension in the back looks good. I do need to figure out how to angle my pinion up cause when I put the 4in. lift on yesterday I get a small vibration at the u joint. Does anyone know what the tallest tire I can put under it with 4in. suspension lift? I can do some cutting and pounding. Ray.