Shift Kit

[masomatic]

I called the local transmission shop about installing a shift kit. The price I suppose was't bad, but he could not guarantee the transmission (4l60e) because of the sun shell. Is this a common weak point and how weak? Is there any other areas of concern?

[JimG]

Yeah, apparently it's true.

Read this post: http://www.gm-trucks.com/forums/index.php?...9&hl=sun+shield

That should explain things for you - personally I haven't experienced this, but I have an extended warranty just in case.

[99Silver6.0]

Planetaries and input/output shafts are pretty weak too. 3-4 clutch pack tends to burn up. Some believe it is due to torque management dropping line pressure which cuts delivery to the 3-4 pack. The TransGo shift kit is an awesome setup. Cures alot of inherent problems with the 4L60 aside from weak internals. Im hoping to throw in a TransGo, HD spacer plate, metal accumulator piston and Vette Intermediate servo. Thats another thing. If you do a shift kit, make sure they replace the stock plastic crap accumulator.

[masomatic]

Thanks for the insight and link. I was also looking at the Transgo shift kit and that is what led me to call the trans shop. I wonder if this failure is more common in trucks/vans than other gm vehicles.

[snoman]

Planetaries and input/output shafts are pretty weak too.  3-4 clutch pack tends to burn up.  Some believe it is due to torque management dropping line pressure which cuts delivery to the 3-4 pack.  The TransGo shift kit is an awesome setup.  Cures alot of inherent problems with the 4L60 aside from weak internals.  Im hoping to throw in a TransGo, HD spacer plate, metal accumulator piston and Vette Intermediate servo.  Thats another thing.  If you do a shift kit, make sure they replace the stock plastic crap accumulator.

Yeah but these "kits" add more strain to internal sprag clutches and such that is why they will not warrant it. Personally I would never install one without a complete tear down and internal beef up. You are playing with fire here.