Re: O/T Seeking GM transmission advice

Posted by Brokenwrench on July 28, 2005 at 14:07:08 from (69.128.199.115):

In Reply to: O/T Seeking GM transmission advice posted by MeAnthony on July 28, 2005 at 12:29:49:

When driving from a stop up to highway speed you should feel a 1-2 shift,2-3 shift, 3-4 shift and lockup. The lockup can come on in 3rd or 4th depending on the load on the vehicle. A quick way to test the lockup system is to get up to 55, and while holding steady on the gas, slightly press the brake pedal. you should see the tack jump alittle, or here a slight RPM change. When you let off the brake, the RPM should drop back down slightly. I doubt your harsh engagement, is related to the converter. As stated before, if the converter were locked up you"d kill the motor.

Your harsh engagement could be something simple like your new motor idling faster. Especially on a GM, where the trannys engage quick to begin with, idle speed can make a big difference. You could also have driveline slop, (ujoint, transfer case chain, differential).

If this engagement problem showed up after the motor swap, I"d chase the idle. Good Luck Brokenwrench

Just a thought, as Allen said (I think), The 700 doesn"t run a vaccuum modulator, so this thing lives and dies by the throttle valve cable. If that thing got way misadjusted or the cable got frayed it could be hanging the throttle valve open, that could make for harder engagements as well. but for that to be true you"d have high hard upshifts as well.

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