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I have a 1996 bonneville that runs at 2000 rpm at 70 mph so how can this be right. I thought the overdrive should bring the rpm down?I have a 1996 bonneville that runs at 2000 rpm at 70 mph so how can this be right. I thought the overdrive should bring the rpm down?
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I don't think you can get a rear end that high sped, the best I've ever seen is a 3.2 something . I had that with a 305 and my engine revved higher than 2200 with that. I think you would be better off with a 700R4 transmission from the early-mid 80's. It should bolt on and the overdrive works off an electric/vaccuum switch mounted on the firewall. Hope this helps.
It does look like you have a 3 speed C6, if the PRND21 description is correct. If you do have overdrive, the "D" will be printed in a white oval.
Sounds like it is OK. My Mustang has a 351C with a C6 trans, and 3000 rpm is about right at 70mph.
The defining factor on the rpm will be the Differential gears, which in a truck, might very well be taller gears instead of highway gears, as the taller gears provide more power output at the axles than the highway gears do.
Example: if you had 3.0 to 1 gears (Highway), that means that the driveshaft will turn 3 times for every complete revolution of the rear wheels(Axle)
If you had 4.0 to 1 gears, then the driveshaft would turn 4 times for every revolution if the axle. Lots of torque for pulling stumps, but on the highway. the engine will have to turn more rpm's to maintain 70 mph vs a 3 to 1.
with the 3 to 1, you will turn less rpm's on the highway, but will have less available low speed power (Torque) at the wheels.
Sounds like you have no Torque converter lock up function. The wiring connector for T/C lockup solenoid must have been disturbed or the solenoid is bad. No lock up will make a 200 RPM difference in high gear
I have a 1996 bonneville that runs at 2000 rpm at 70 mph so how can this be right. I thought the overdrive should bring the rpm down?
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