Kim could be on the money where he says the rear band is not releasing when you select 2nd. But I have just had a 904 apart that also had a Cheetah RMVB from Turbo Action. According to the part number engraved on the sandwich plate, the VB does not apply the low band in 1st gear. If you have the same VB (part number 17156-2) you can see the number on the plate when you drop the pan, then I would definately take a very close look at the rear sprag. It may be damaged & not releasing. This is not a good situation.
