Transmission question

[mysteric]

Hi All,

I just put freshly rebuilt 4L60E into my 1994 stock LT1 Corvette. I also replaced the stock torque converter (which was fried) with a B+M Holeshot 2400. My problem is that when I slow down and the tranny shifts down from 3rd gear to second, on the way back up it wont shift until like 5000 or more RPM. If I am just starting out from a dead stop it will shift through the gears fine. I replaced the MAP sensor and that didn't seem to help, although the old one was cruddy looking in the manifold mounting hole.

Is there any way to reprogram the shift points for the ECM? I know it is computer shift points starting with this model year.

Any comments/help will be much appreciated.

Rick Woods

1994 LT1 Corvette
1993 LT1 Z-28
1991 LO3 Camaro Convertible
1988 L98 Hardtop IROC

 

[Hib Halverson]

First of all, if this car is not heavily modified, sell the aftermarket converter and put the stock one back in. Unless the car is seriously modified car that drag races regularly, the loose converter offers little practical performance improvement and costs power and gas mileage.

That alone may fix the shift point problem.

The trans calibration is in the ECM and will not have changed.

It is possible to alter shifts points to some extent using one of the various hand-held reprogrammers.

 

[mysteric]

Thanks for the advice Hib.