Rear Diff Gear Install Troubles

SIN-Japan

New member
The Mechanic I took my Surf to is having troubles getting my gears setup properly.
Disclaimer: I no nothing about installing gears.
Here is some base info.
My Rig: 1997 Hilux Surf SSR-G 3.4L Auto, no-elocker.
To the best of my knowledge I had 4.10 gears stock.

I purchased Nitro 5.29 gears and Yukon Master install kits and ARB Airlockers.
The Pic below will be the gears, the next post will be the install kits.

Problems: So after getting the diff put back together the mechanic had me try driving it. Reverse is chunky feeling almost as if I am rolling over rocks or sticks type of feeling. So driving forward seems ok until I let of the gas and there is a terrible Buzzing/Vibrating/Grinding type of noise, if I ride the brake before letting off the gas I can mostly avoid this noise.
The mechanic has since tried to reshim it and adjust backlash and such to no avail. :(
He is about to give up and there is not many options here in Northern Japan for places that would even think of doing this type of install.

1 Note: I did notice the Yukon Install kit says the following (V6 & T4 Toyota Master Overhaul Kit, 03&UP w/29SPL_Pinion) Kit#14212.
The 03' & Up thing has me worried, is this the correct Master Install Kit?


Any Advise would be helpful that I can relay on to him.
 

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