If pre update (to 1994), then LT77 trans req ATF Dex3 . If later (1994 on) with R380 trans, then 75w85 gear oil, (I use Valvoline Duragear) is better. You can still use ATF in R380 in early 1995 models, but I find all R380's respond well to the 75W85.
JC


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