Harsh/Delayed 1-2 upshift...

[illegalFSJ]

It seems that my wagoneer (TH400) has been shifting harder and at higher than normal speeds. hits second at 20-25 mph instead of 15, and hits 3rd at 35-40 mph instead of 30.
The tranny is full of fluid. I did a filter/pan gasket service on it and found alot of grey/silver stuff in the pan. This tranny was supposedly rebuild recently.
The trouble seemed to have started after I played around with the timing. I got it back to where I think it should be, but it still shifts late/harsh. I also think the carb is going south. So, is it just a tranny problem that needs another rebuild, or might it be an engine tuning problem that is manifested in transmission shift quality?

[paddyp]

Check the vacuum line going to the moderator, and the moderator itself. I got $500 off the price of my Wag because the vacuum line was burnt in two, and the guy thought the tranny was dying.

[woodybeone]

Also check the spring on the carb to tranny shift rod. If the spring is weak or the linkage is sticky the tranny will hold first for a really long time.

[RustyJeep]

yes, check that vacuum line and see if there's any ATF in it. If there is, your modulator is bad. Check and see if that line has vacuum too smile.gif