Bongo Fury

Just a simple question....
Why do auto Bongo's not shift into top until warm?
What was the thinking behind this? Preservation of gearbox components?
Just curious.
Cheers
Russ

Yes its part of the gearbox design here is a the manual for the boxes http://www.g8dhe.net/bongo_images/gearbox/RC4AEL.pdf

"To improve shift quality, a plate-type clutch pack 2-4 brake, which has optimum control at low oil temperatures
and is unaffected by changes over time, is used."