1990 Mazda b2600 • 4 cylinder 4WD Automatic • 210,000 miles

1990 mazda 2600i 4x4 auto trans will shift fine when cold then after 4 to 5 miles drops to 4th then 3rd and wont shift back to 4th or od when I move shifter down to 3rd and back to drive will shift to od for about 30 secs then back to 3rd I have changed neutral switch and shift selinoids and still having problem any advise will be appreciated also trans was rebuilt about a year ago but selinoids where not changed at that time
July 6, 2011.

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