I know this is a silly question but you do have enough fluid in it right? I thought I filled it up and low and behold that was why mine was not shifting into 3rd. I'm no expert when it comes to trannies, I usually send that stuff out. But I figured what the hell try putting in a kit, if you screw it up then pay some one. lol But I put mine into a tranny with under 10,000 miles on it. Your's might just be getting old, or the bands might need to be adjusted? Did you set them right before you closed up the pan?
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1970 Stang Conv:
en:Boss351 (balanced/blueprinted)
mech cam(240*@.050/.540 lift)
Scrw in studs/comp cams rllr rkr
Mldn valves 2.19in 1.71ex
ported polished cc'd hrdnd ex
Keith Black FT pistons(10.25/1)
Weiand Excellorator manifold
Holley700 DP mech 2nds
MSD 6 box and Dis
Headers/2 1/2 inch duels
tr: modified FMX
re:9-inch/3.89 limited slip
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