Here is a good formula to determine what RPM you should/would be running with no converter slip:
GEAR RATIO x MPH x 336 divided by TIRE DIAMETER.
For my combo using a Continental 10" (Jim Hand model), 3.42 x 120 x 336 divided by 28". The calculator shows 4924rpm's, we go thru right at 5100rpms, or about 175rpm's slippage in high gear.
That works out to 3.5 percent slippage if I did my math right.
I don't know the exact diameter of your tires, but it looks like trap rpms should be around 5100rpms with no slippage (30" tires). 900rpm's is quite a bit of slippage.
You can have your cake and eat it too with converters, it just doesn't come cheap.....Cliff
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https://cliffshighperformance.com/
73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile),
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