m1noel Posted February 1, 2009 Share Posted February 1, 2009 Just got back from my first drive after installing the R/T mount from Roostmonkey. What an incredible difference. Even though I had a new diff mount and snubber belt, I had a pretty good vibration under hard acceleration. With the R/T (Thanks Ron for the design) mount, along with the stock Datsun mount, when I step on the gas the car just goes. Incredibly smooth. Anybody want to buy an almost new snubber belt? Mike Quote Link to comment Share on other sites More sharing options...
GrayZee Posted October 25, 2009 Share Posted October 25, 2009 Let me understand.... The RT mount holds down the diff. against the stock mount for a snug fit, to prevent it from tearing? Basically, it's kind of like the stock strap, except more extreme in holding down the diff.? This all correct? yep Quote Link to comment Share on other sites More sharing options...
Nigel Posted October 25, 2009 Share Posted October 25, 2009 yep Nope There's no need to use the stock lower diff mount. Nigel '73 240ZT Quote Link to comment Share on other sites More sharing options...
Savage42 Posted October 25, 2009 Share Posted October 25, 2009 No! The mount is pretty stiff and interlocks (internally), so it doesn't move much all. (which is shouldn't, anyway!) The force during acceleration actually goes upward, so it's actually the way it should have been built in the first place, instead a big chunk of rubber that's trying to be be torn apart every time you accelerate. Quote Link to comment Share on other sites More sharing options...
Nigel Posted October 25, 2009 Share Posted October 25, 2009 Here's a cutaway of the Energy Suspension bushing... Nigel Quote Link to comment Share on other sites More sharing options...
Savage42 Posted October 25, 2009 Share Posted October 25, 2009 ahhh, i think i got it now. The mount actually is bolted on the differential also. I thought it was just acting like what the stock strap does (keeping it from going one way only), but this actually holds it from going upwards and downwards. exactly!!!! Quote Link to comment Share on other sites More sharing options...
piston Posted October 26, 2009 Share Posted October 26, 2009 if im reading correctly, m1neol is running the stock mount with the r/t mount? the last time i had both, my car vibrated. the idea was that with the r/t on top and stock z mount on bottom, it will not go anywhere even though the rubber should absorb the vibration. someone correct me on this because i know it doesnt sound right at the same time, people say it would vibrate because it does not move up or down. Quote Link to comment Share on other sites More sharing options...
Savage42 Posted October 26, 2009 Share Posted October 26, 2009 If it's wedged between 2 mounts, it may be too firm to allow to dampen and more vibrations will be felt through the car. You want some movement, just not a lot. Quote Link to comment Share on other sites More sharing options...
rejracer Posted October 26, 2009 Share Posted October 26, 2009 I run both the RT mount and the stock mount, the difference is I use a rubber mount up top. I think I used a mount out of a 79 Z28, but most the GM cars equipped with a Th350 would use the same mount. I don't get any odd vibrations. In general when you replace a stock type isolator with a poly isolator, you will get increased noise/vibration transferred to the body/cab. The movement of the diff is going to have little to do with vibration, assuming your drive line angles stay within reason, and the motion does not cause metal to metal contact that would transmit the vibration around the isolators. When installing these things, you must be sure not to over compress the isolators. Take your time, and shim them to get the right driveline angles, and make sure the upper and lower diff mounts are not already compressed. Quote Link to comment Share on other sites More sharing options...
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