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700R4 build
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A shift kit does not address the hard part upgrades on an early 700 trans.
What Horse Power numbers are your plans for this trans use? Your 1984 trans should have the 27 spline (small) input shaft. Later trans have a 30 spline shaft and thicker over all shaft diameter. The forward sprag assembly was up graded in later units. 10 Vane pumps are more common in later units. The low-reverse roller clutch is wider in later units. The aluminum input drum is machined differently , easier to install a few more 3-4 frictions and steels. Over run pressure plate is thinner with different thickness frictions and steel plates for the forward clutch pack. A quality TransGo shift kit will address the internal pressures and the TV system for pressure rise inside the trans. I suggest using a drive shell known as 'the beast'.. a good upgrade I would suggest that the pump bushing is properly 'staked' into place. Also drill the drain back hole behind the seal slightly larger. ![]() stake pump bushing: drill drain back hole larger: Plug the 3-4 clutch passage relief hole in the pump. GM removed this hole in later pumps:
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At the Bonneville Salt Flats, first gear is known as 130 mph. |
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Thanks guys I'm still unsure of exactly what I plan to do with this car.
It is very clean with only 52000 miles on it. Some kid had it and tore the top end off and doesn't know how to put it back together. So if a throw a engine together with what I have I'd guess it'll be in the 325 horse range. I thought about gutting it and putting the 454 and power-glide that came out of my nova but I'd have to upgrade the rearend immediately. Decisions decisions |
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| Recent Transmission - Rearend posts with photos |
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