Q: how to fasten lock servo in 90s C/K?

About three months ago, the front driver side lock servo came loose in my 99 2 door (OBS) Tahoe. The servo was riveted in and clearly lasted 10 years.
So I drilled out the old rivets (didn't pay attention but I'm pretty sure they were aluminum) and popped in two new aluminum rivets. All was well for a couple of months now the servo is rattling when I slam the door. I pulled it all apart tonight and sure enough there is now slop in the new rivets.
What is the best way to fasten this thing back? Does a body shop have better rivets from the box store? Should I put it in with hardened machine screws with loc-tite? Seems like there is room for short screws. GM probably used rivets because those are fast in assembly.
Any experts have advice on how to fix this one once and for all?
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You can get steel rivets. Alum rivets will corrode and loosen with thermal cycling.
Stainless machine screws would work too, if you can get them in there. Use Nylon lock nuts, no locktite.
Cheers
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My Tranny is slipping/grinding in REVERSE and also OVERDRIVE so I figure it is time for a new tranny or a rebuild BUT I have found a rebuilt trany but before contacting him, I just wanted to get your opinions on something. He states he has TWO 4L80E transmissions. One for a 2 wheel drive and one for a 4 wheel drive. Is there a difference between a tranny for a 2x4 and a 4x4 ????
Scott Broderick
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My transmission is slipping/grinding in REVERSE and also OVERDRIVE so I figure it is time for a new transmission or a rebuild BUT I have found a rebuilt transmission but before contacting him, I just wanted to get your opinions on something. He states he has TWO 4L80E transmissions. One for a 2 wheel drive and one for a 4 wheel drive. Is there a difference between a transmission for a 2x4 and a 4x4 ????
Scott Broderick
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Probably output shaft length, the 4x4 has a transfer case, 2wd does not.
Cheers
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