The last year for the 091 tranny was 83. The 85 and 87 should both have
091/1 but with minor differences inside.  All US waterboxer 4 speeds are
interchangeable. Near one of the bottom corners of the tranny is the ID
# starting with 2 or 3 letters. Here is a partial list of 4 speeds.

DK, DM, DZ - 091 trannys 80-83 in US. (Air cooled and Diesel)

DU, ABD, ACW - 091/1 trannys 83.5-91 in US. (Waterboxers)

Mark

"Vern D. Moen" wrote:
>
> I have a 1987 Vanagon GL 2.1 litre that has too many miles on its rebuilt
> once transmission. I also have an 1985 1.9 litre. I know the transmission
> changed, but it possible to swap the 091 transmission from the '85 into my
> '87 with the 091/1 (I think I'm getting that right) until I get enough money
> for the rebuild? I know the gear ratio's are different, but can this cause a
> big problem?
> Thank You,
> Vern Moen
> brin@mac.com