These cars will rip a rubber trans mount every 6 months or so, I installed a prothane mount and took it for a test drive on a nearby highway last night. Under normal driving I can't feel any big difference with the vibration. What I can definitely feel is how a great deal of the drive train sludge is gone. I used to have a regular autozone mount in there and it always felt like something was loose down there sometimes something would hit the tunnel underneath me when going trough some rough roads I even had it inspected a couple of times and nothing was broken down there.
When you step on the gas or downshift is when the fun starts, it does vibrate A LOT but nothing to be afraid of. Looking at it on the bright side I think of it as having a built in massage chair in my seat now haha.
Anyway I've never took this car past 100mph and I was impressed on how hard it will pull past 80mph. I shifted down to 3rd and it lifted the front end as if it was going from a stand still and by the time I looked down the seedo I was almost doing 130.
There's a local guy who has a spohn super comp torque arm up for sale. I was thinking of buying it, it's obvious that the harder chromoly material won't break like the stock one but I'm not so sure if it will help on going faster or not. I've read a lot on how aftermarket torque arms increase traction and put more power to the wheels reducing your 60ft times. But I actually don't have traction issues right now, if I do a good burnout at the track the car hooks really good and doesn't spin the wheels at all. If that's the only benefit I get from it my guess is that it would probably don't do much difference on the overall E/T and may not be worth spending the $400 dollars on it.
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