I have computer modeling software and some of the dyno charts, and will be psoting some data in my SLURP series later, but I can tell you right now, at least the following:
My SLURP seris truck, "Red" has a slightly warmed 261 in it, the power-robbing original iron case Hydra-Matic, and a 3.9 axle. The computer modeling software says this combo will break 100 mph, desite the Hydra-Matic.
With a STOCK versus modified 261, the software says that it would not break 100 with the Hydra-Matic, but would just barely with a manual tranny. BUT, you'd be spinning 4600 rpm at 100 mph!
The 3.9 gearing results in 2825 rpm at 60 mph, and 3060 or so at 65 mph.
I have to shamefulyl admit that I saw 95 mph on the speedo (actually, 4500 on the tiny tach in my dasboard)recently before common sense prevailed.
Jim G
