Quote:
Originally Posted by Old Money
1870 i think, trans.componet slipping.
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The Infamous P1870, That will cause a harsh 1-2 shift.
The most common cause is the Isolation-PWM Converter Valve has worn the Bore that it rides in.
The Actuator Feed Limit Bore wears as well, The controls pressure to the ISO-PWM Conv. Valve.
Sonnax makes fixes for both, Requires the Valve Body to be reamed for oversized valves. The Tool kit for both bores are around $800, So its not something a DIY'er wants to pay entry price for.
VBX is owned by Sonnax & will have all the updates,
http://valvebodyxpress.com/prodView.php?theId=65