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Re: '88 1-ton TH400 won't get up to speed
FWIW the shift points on my '85 C3500 w/454, TH400, and 4.10 gears is 1-2 @ 6 MPH, 2-3 at 16. That's basically coasting. And yes, the modulator works - highest I've seen my 2-3 shift is about 35 MPH. No electric kickdown.
If it's slipping, when you step on it the engine speed should jump more than a few hundred RPM with no corresponding increase in ground speed and little acceleration.
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Alex V.
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1967 C10 Suburban, 350/NP435, Green/Green, PS, PB, HD cooling, charging, shocks, and springs.
1985 GMC C3500 SRW, Sierra Classic, 454/TH400, white/blue.
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