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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: rockable on October 31, 2012, 04:53:43 pm
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My engine/700R4 Combo has nearly 100k miles on it. The engine gave up the ghost and I am replacing it with a 350 crate motor. The 700R4 has only one leak, the speedometer cable drive which I plan to replace.
My question is this. Is there anything other than changing the fluid and filter that I should do? I only drive this truck about 3k miles per year. How long do 700R4s last when not abused and serviced?
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Is this on a 2wd truck? Personally if your getting good shifts and it still performs at top, i wouldnt do anything more than a fluid and filter change with a new tranny pan gasket. Now if your thinking of adding power to this crate 350 you may want to consider a lockup kit for the tranny and maybe a new detent "kickdown" cable to be safe.
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It is 2WD and it has been working fine. I'm putting a base crate 350 in it. That's all. All I planed to do was change the fluid, filter and gasket.
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Then what you have planned will work perfectly fine.
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How long do 700R4s last when not abused and serviced?
Well, that depends on the use, the engine in front of it, the weight of the vehicle, axle ratio and a host of different factors. Considering that you've got a pre-87 700R4, I would say that yours has lasted longer than most. That said, I would just keep driving it and when it does fail, I would find an 87 and newer 700R4 to stick in there. If you're going from a 305 to a 350, it'll definitely put a little more stress on the transmission.
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How long do 700R4s last when not abused and serviced?
Well, that depends on the use, the engine in front of it, the weight of the vehicle, axle ratio and a host of different factors. Considering that you've got a pre-87 700R4, I would say that yours has lasted longer than most. That said, I would just keep driving it and when it does fail, I would find an 87 and newer 700R4 to stick in there. If you're going from a 305 to a 350, it'll definitely put a little more stress on the transmission.
To maximize transmission service life, consider adding a trans fluid cooler in front of the radiator to supplement the factory wet cooler.