What transmission is in a 1990 corvette?I think it is a 700r4?and if yes will any 700r4 fit ?

Yes, but you will need to add a stand alone transmission controller as the 88' does not have a way to control it.

Check your transmission fluid level as soon as possible.
If you are experience hard transmission shifts, it is possible that the only problem is a low transmission fluid level. Low transmission fluid level can change the operating pressures of the transmission as well as reduce the amount of lubricant present between the clutches and bands and raise transmission temperatures. All these things can cause hard or jerky shifting. You need to identify why the transmission has a low fluid level and refill it as soon as possible.

Fluid and filter will not result in loss of just one gear...yes your going to have to take the tranny out and get it overhauled or replaced

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This year has a small valve that senses pressure from the pump and lets the trans. lock into overdrive. You can find a new one at Jegs or Summit. Yours is dirty or has gotten weak. Yes you can change it your self. Do a internet search for TCI 200R4 / 700R4 Torque Converter Lock-Up Kit.

It will mate to the engine, but the turbo 350 is shorter then the 700R4 and your going to loose the lower first gear ratio in the 700R4 and the OD that the Turbo 350 don't have. It can be done, but your going to have to relocate the transmission cross member and have a longer drive shaft made.

Good luck.

What you are thinking about doing is all "custom mods"...Nothing is impossible but what you are asking will take a huge pile of money and a lot of expertise. Corvette differentials are completely different and require extensive modifications to install, with very little benefit other than being "different" and a good conversation piece. Likely you would be better served by installing a diff made by Strange Engineering which would be far stronger. In a Camaro, you would also benefit more by using a good 350 engine (performance crate version) with a 700r4 transmission behind it (more reliable and less aggravation) The biggest problem would be getting a wiring harness and ignition system to operate the whole thing, but being a Chevy, there are a great number of suppliers of aftermarket harnesses to work with. That said, it will still take a heap of $ and experience to get it all together!!!
Good luck though!!!

Yes it is a 700R4. They went to a 4L60E in 1993. Good Luck

more than likely it has a 700r4. full size trucks came from the factory with that transmission. most t350's came in mid size cars

try calling a junkyard and see if they will tell you the enterchange ok good luck

Is it the 5.7 L? It's mounted on the transmission. countrycurt0