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In a back half car the cars tend to twist even thou you may not see it. I run a front engine plate and a mid plate. The tranny is bolted down to the trans crossmember. So when the chaasis flexes the weakess point break. On a poweglide the stock cases are weak. I have the JW bell housing and tail shaft. Glides tend to crack right above the shifter arm as mine did. I should have not bolted the tail housing down and the tranny could have move with the chassis and not broke. I will upgrade to an aftermarket case to fix this problem.
If you have solid motor plates, do not mount the glide solid. The stock cases live behind much more power than you are currently putting out.
You have to provide room for the chassis flex. If you choose to support it, use some form of mount that has some give in it. Old shock biscuits work well. I put one on either side of the tailshaft mounting point so it can move a little up or down. You may want to go two on each side, with only a back half car. I have an extremely stiff chassis, don't need much. I use a total of four biscuits, with two mounting bolts in my custom mount. You might want to double that, to give the extra flex room and still give the tranny some support.
Looks like there is some room for improvement with some rear shock adjustments. Try hitting the tire a little harder before adding ballast. How loose is the front? Best place to start is as loose as you can get it, with as much front travel as is available, then reduce both a little at a time till you are happy with it.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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