Turbo 400 shifting issue

[novassdude]

Finally got to got the car out to try. Still waiting on a converter for my 200 trans so we used my old bracket turbo 400. It s set up to just put it in drive and shift at 6000rpm.
First pass the car burped a little on the line (pretty sure to cold and to low an idle) any way from there on car ran clean shifted at 6000 just as I thoght it should. Shut it off at the 1000 went to the pits looked it all over and every thing looked good. Went up to make the next pass and it would not shift. Vacume line was still in place any good ideas where to look?

[Jim Kaekel]

First, check the governor, valve may be stuck or gear is stripped, gear is nylon. Check modulator valve and be sure it isn't stuck.

[ss3011]

Did it work in the burnout box, but then wouldn't shift on the pass ?

[novassdude]

Originally Posted by ss3011

Did it work in the burnout box, but then wouldn't shift on the pass ?

Yes it did shift in the box. I did go to neutral after the box to clear it out.

[ss3011]

It still drives in 1st, but does not shift ? Does it back up ?

[Mike Leopold]

I have lost 2nd gear on a turbo 400 a few times over the years. The problem is usually a broken sprag on the direct drum. If the sprag won't hold torque and slips you won't have 2nd gear. if it locks up and won't freewheel, you will smoke the direct clutch when shifting to 3rd gear. One time a piece of gasket material broke off and blocked the hole in the bolt in the center support that feeds the intermediate clutch. This also resulted in no 2nd gear.

[Jim Kaekel]

Mike is correct, that is also a possibility. Just be sure to check the simple stuff (governor, modulator) first before you pull the unit out.

[novassdude]

Originally Posted by ss3011

It still drives in 1st, but does not shift ? Does it back up ?

Yes I drove it back to the pits no problem it backed up fine when we went to load it. It did shift to second on the return road when I wasn't under hard exceleration.

It just stumped me cause the first pass the tranny acted perfectly.

I am staring to think checkers is looking like a good sport.

I will probably just park it again put in the good tranny next spring.

Thanks for all the help