in what year did gm switch from the 7 vane pump to the 10 vane pump on the 700r4s. i just had one rebuilt for me and it was built with the 7 vane pump with a stock rebuild, no shift kit, no bigger servo, etc. what would something like this go for?

 

86 was the changover year.
Vader on thirdgen.org posted this info:

"Most of the cars built through early '86 got the older style pump (a 7-vane pump versus 10-vane pump) and single valve body in the trans. You can find the manufacture date label in the left door jamb.

You can also look at the transmission pan. To clarify identification, GM changed the pattern of markings on the pan bottom where the magnet is located. These markings are visible from the underside, near teh right rear corner, and form a square shape about 1-3/4 inches. The later pans (holding the auxiliary valve body) have unequal length lines (one set is longer than the rest) unlike the earlier pans which have all lines equal length. Also, later pans are slightly deeper to accomodate the extra valve body.

You can verify all this by looking behind the torque converter. Look for a casting number on the front pump. If the last three digits are "732", then you have the newer version of the 700-R4.
"

 

thanks man, that helps alot

 

No prob, just helping out a fellow thirdgenner.