Looking for some Differential advice

Rusty is right, snap a pic of your carb and intake for us. You are at 1800 rpm in 3rd @50 mph, you should be able to downshift and accelerate up any grade in San Diego (I’m from north county)

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Thanks! I’ll do that tomorrow. I’m in La Mesa. Driving back from Lakeside is pretty much all uphill. My car wants to stall at 2000 rpm and doesn’t want to do any more. It only wants to go 45-50.