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Old 09-29-2010, 11:23 AM
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700R4 shift points

How does one change shift points to higher rpms? And, how difficult is this procedure? Currently shifts from 1st to 2nd at about 4500 and from 2nd to 3rd at about 4800.

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Old 09-29-2010, 08:19 PM
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The weights and springs on the servo are changed to move the shift points around. The TV cable can also play a small part in shift points. Are the shift point rpm's you posted under WOT?

Vince
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Old 09-29-2010, 08:58 PM
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Good question... I just installed a new tach cus my truck didnt have one (89 s-10 with 93 350 with 700R4) and when it shifts in D from 1-2 at light throttle its only about 2300RPM..WOT about 4000 and it shifts QUICK and hard....I think someone installed a shift kit wrong........ what r average speeds/rpms for 700r4 shifts?
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Old 09-29-2010, 11:02 PM
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I think Vince intended to say the weights & springs on the "Governor" not the Servo, can be adjusted to lower & raise shift points. Lighter springs will raise shift points.
http://www.summitracing.com/parts/BMM-20248/
http://www.summitracing.com/parts/TCI-326500/

Rear gear ratio can change shift speed & RPM as the Governor is a speed sensor. Faster Trans Output Shaft speeds will occur with numerically higher ratio rear gears & cause quick low speed shifts.

I'm sure someone knows what average speed range the 700R4 should shift at. It's been mentioned a few times. May find it doing a search.
I read somewhere WOT 1-2 shift should be 40-45mph.

Last edited by SSedan64; 09-29-2010 at 11:09 PM.
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Old 09-30-2010, 05:11 AM
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light throttle shifts (depending on what you would call light throttle) should be roughly 15-20 for the 1-2, 25-30 for the 2-3, and 35-45 for the 3-4shift.
as far as mph for WOT shifts, that will vary depending on engine and rear end gearing, which at that point you will be looking for WOT shifts to happen at or near redline of the engine.
when it comes to governor calibration, the springs will affect light throttle shifts (the lighter the springs, the later the shifts), and the weights on the governor will control the WOT shifts. (less centrifugal weights will allow higher rpm shifts.)
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Old 09-30-2010, 05:13 AM
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light throttle shifts (depending on what you would call light throttle) should be roughly 15-20 for the 1-2, 25-30 for the 2-3, and 35-45 for the 3-4shift.
as far as mph for WOT shifts, that will vary depending on engine and rear end gearing, which at that point you will be looking for WOT shifts to happen at or near redline of the engine.
when it comes to governor calibration, the springs will affect light throttle shifts (the lighter the springs, the later the shifts), and the weights on the governor will control the WOT shifts. (less centrifugal weights will allow higher rpm shifts.)
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Old 09-30-2010, 09:38 AM
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Thanks

Thanks to everyone for your information. It looks like I need to find someone with knowledge about 700R4s and have them reduce the tension/weights of the springs and weights on the governor. My 1976 Corvette has the original rear end which is a 3.08:1. It has a ZZ4 crate motor(355 hp with 405 torque), and I believe GM recommends a 5800 redline. It would appear the shift points could be increased about 1000 rpms as it now shifts from 1 to 2 at about 4500 rpms and 2 to 3 at about 4800 rpms. Again, thanks for all the helpful information, and if anyone has any further suggestions, I would certainly appreciate them.
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Old 09-30-2010, 05:19 PM
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Quote:
Originally Posted by SSedan64
I think Vince intended to say the weights & springs on the "Governor" not the Servo, .
Correct, my bad

Thanks
Vince
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Old 10-01-2010, 05:06 PM
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good info here thanks
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