1988 700R4 Electric transmission

Sounds like a blocked transmission oil filter or front oil pump problem. Have you had the transmission serviced (e.g. flushed with fluid and filter replaced)?

Did you hook up all the fusible links correctly at the starter? If this is tilt steering then also make sure the tilt gear and the ignition drive gear are timed to each other so you get full rod movement to the starter switch located down at/near the bottom of the steering column.

It is DESIGNED to do that...it is called "passing mode".

does it lock up in any gear? sounds like blocking rings trying to stick, what type oil did you put in it?
should take auto transmission fluid

I don't think you can get a rear end that high sped, the best I've ever seen is a 3.2 something . I had that with a 305 and my engine revved higher than 2200 with that. I think you would be better off with a 700R4 transmission from the early-mid 80's. It should bolt on and the overdrive works off an electric/vaccuum switch mounted on the firewall. Hope this helps.

I believe only another 460 motor.

The big block should mate up to the trans. just fine if it's a T-350 or T-400 trans. that you're using. You'll have to change the engine mounts and your accessory brackets to the big block application. The fuel pump, I believe, is going to be different. The carb. linkage will be the same. Your exhaust may not bolt right up depending if you're using headers or not. The distributor will be the same as the small block. The guage hook ups will be pretty close to the other engine.

you may be confusing the torque converter clutch engagement with o.d. this trans has a problem with the T.C.C. regulator valve wearing out the valve body bore. this will cause the converter clutch to engage only sometimes or not at all. this will set a P1870 code in the control module. when this code is stored in the controller, ( check engine light may or may not be on), it increases the pressure in the transmission causing the 1-2 shift to be harsh. ask a local tranny shop to scan the vehicle ( most will do this for free) if this is the problem they can either fix your valve body (sonnax parts) or replace it with an upgraded valve body. hope this helps

Yes they are ,and it may be the Transmission Solenoid Body/Block 4L2Z-7G391-AA inside the trans. They are around $270.00 Have to remove the trans pan and about 7 screws holding it. It has 4 shift solenoids and 3 pressure control solenoids and 1 converter lock-up solenoid in it.

It just holds 2nd forever. Is the 1-2 shift point high?