Question about 1990 Ford Mustang

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Since fitting aod transmission mechanical 4 speed overdrive I have noticed a marked increase in fuel consumption I have a 1968 mustang with 2.9 gears and it had a C4 in it before.I did not have a tacho before so have no idea aprt from gut feeling about the revs.It now feels like the revs are too high for the speed.I checked with a tacho and found that 70mph in 4th overdrive was approx 2430rpm which seems too much to me?the transmission is driving nicely just rebuilt by local transmission shop prior to installation Its is my gut feeling that the lock up in the transmission is not functioning and it is in torque converter drive all the time I have fited a 2400rpm advertised stall converter which stalls at more like 2100rpm. what do you think?I dont understand how the lock up works in the transmission?

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  • Ford Master
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Sounds like the vac control valve or the kick start cable is fitted right ,but then you did have the rolls royce of auto boxes in as original ,a c4 which should be about 3000rpm for 70mph ,depending on the final drive ratio fitted to your car

Posted on Nov 18, 2009

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