just bought this car . dont know if im driving it corretly its a 4 speed with over drive in2-3-4 th in each of the gears it slips in over drive to soon what gives? thank you M,Gagnon P.S. need some parts for restoration what do you have?
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Re: C4 4+3 tranny slips into over drive to soon?
Sounds normal. With the light throttle typical of normal street driving the transmission will want to run overdrive as much as possible in second through fourth. It was a strategy to keep the C4 out of the gas-guzzler tax. GM management said avoid the tax or forget offering a manual transmission, and they could have not beat it under the EPA mandated shift strategy without some kind of automatic assist to keep engine revs as low as possible.
Dave McClellan has some very good insight into the design philosophy and operating characteristics of the 4+3 in his new book, which is an excellent read. It's available from the NCRS Store.
Duke
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