i just got a new style bravo one upper.it did not have the shims in it.it does not have the numbers on the back of the case .how do i find out what shims to use or the gear back lash. thanks mike

Mike,
There are two different shims on the new style (OW) case. Wire shims on the pinion bearing (bearing race has the spacer built in) and shim/races that the thrust bearrings ride on.
You need the tools to measure pinion depth and the shaft/flag and dial indictor mount to measure gear lash. That is the only good way to setup the gears properly. If you can get your hands on a Supplement #28 from Merc, it explains the procedure to measure gear lash.
Hope that helps.
Dick

do you know what the gear lash is on this drive thanks mike

The manual list's different specs for different ratio's ( teeth count)

it is a 1.50-1

If you have 27/32 gears the back lash is 0.011 - 0.016 but like Mr. Gadgets posted you must set pinion depth first on the new cases. U-joint pinion shims come from .028 to .040, no shim starting point is a .035. First time doing a new style upper with manual and proper tools will take some extra time and a lot of looking at the manual. Also if you are hunting for #28 Supplement they are a two volume set makes sure you get the one that covers uppers.
Forget to mention the thrust race for new cases come .058 to .067 the book doesn't give a starting point, I would start with around .062 ( thats around the middle ) The new shims don't come in packs like the old ones so you have to buy each one individually pinion shims run $3.00 - $4.00 ( 13 different ones )each list and thrust bearing races list for $ 30.00 each (10 different ones). I keep one of each pinion shim and two of each thrush bearing on hand, so I can finish doing an upper and not have to measure than go hunt down shims. I don't think you find to many dealers with the shims in stock.

Disregard what in put about #28 Supplement it Bravo supplement #39 that has two volumes.