gaffbro,
you can put the s10 tail housing on the astro van case. it may be that the speedo gear is located in a different place. if so just use the s10 output mainshaft also. reason being is the astro van t5 had a 3.50 1st gear, a little better than the s10 version which was 3.76 or 4.03.
i took a non world class t5 from a v8 camaro ( 2.95 1st gear ) & swapped in an s10 tailhousing & output mainshaft. junk t5 trans. for parts are pretty cheap
rebuilding a t5 is not rocket science. if you can rebuild a carberator you can do a t5! the only really hard part is sliding the tail housing back on over the shifter rail & keeping the trans. in nuetral at the same time.
i got a video from hanlon motor sports & watched it several times & was able to do it. the video is for the world class trans. but it gives you the general idea. manuals are also available. good luck. sorry for such a long post!
robert
