Re: Converter Slippage at top end
 

Any reason why you haven't tried lock up?

Re: Converter Slippage at top end
 

Thought of it.
No need with current 4.56's and 28 inch tires.

The Yank was designed with an extra large clutch.
Have calculated adding more gear and using existing Converter.
Sure would launch hard with 5.38's.

Would ET closer to the K-L/SA Index with the current Blueprinted cam.
Mostly cool weather near sea level tracks.
Thinking if the car used the Stocker cam would not need so much converter.

D

Re: Converter Slippage at top end
 

4L60 has a 3.06 first gear and a huge ratio change from 1gear to 2nd gear . Might want to checkout the Sonnax gearset that reduces 1st gear into the 2.8 range . Are you planning on using 4th gear ?
Back in the mid 80's I ran a Olds Cutlass with a 307 and a 200-4R with a 2.74 first gear , 5.57 rearend gear , and a 28" bias tire . The problem with all that ratio is the engine can't rev up that fast . Much of the engine power was trying to accelerate the drivetrain , and not the car . Ran better with a 5.38 ratio , and swapped in a different overdrive ratio (.72) and that helped a bunch . Converter clutch was worth 2 mph !

Re: Converter Slippage at top end
 

Depending on what I do...
5.38 will work with existing PS cam with OD or Locking Yank 4400PT..
In fact would be good with Stocker Cam holding rpm below 7000rpm. Preferably 6800 rpm with existing 28 inch slick.

Want keep the rpm 7000 or under.
Speaking to Don Compolito their J/SA crosses at 7500 rpm
Car would need better rods for that rpm.