I just bought a 94 Formula
No paperwork - but the parts look to match the description.
Was told it has a Yank 700R4 and stall.
It's oon the lift and I read SS3800 and 05/03 on the convertor.

How do I tell which trans I have and if it's supposed to lock up?

 

Unless it was a switch from a manual its likley a 4l60e the 700r4 s cousin . I think I answered you on LS1TECH

 

It should be a 4L60E in a '94. Do you have a TV cable attatched to your throttle body for the transmission? The 700 used them. The 4L60E doesn't. Do you see a governor cover on the drivers side/rear on the transmission? This will be a large metal cap, near the rear of the transmission, just before the tailhousing. Is your case electrical plug on the drivers or passengers side? The 700 uses a smaller plug on the drivers side. The '60E uses a larger plug on the passengers side.

Frank
CPT

 

ok - I'll check your pointers Monday when the shop opens thank you!

 

large electric plug, passenger side above the pan
now we have to do some testing to see if lock up was eliminated on purpose - thanks