The 200-4R. The 700-R4 will fit but a new driveshaft would have to be fabricated due to the 700's longer tail.
Depends on the engine
What size cd player fits 1988 coupe deville
4l60e
13
It's a metric 200R4
Front = 3 & half, Rear = 4x10
probably a BOP turbo 350 tranny.
32mm
If it's a Cutlass Supreme (RWD), 4 speed is a TH-200r4. 3 speed is a TH-250. Not sure about the FWD cars (Calais, Cierra).
Either a TH 200 Metric or a TH 350. Either will bolt right in place of the other. If you have the choice, use the TH 350....much stronger transmission. You can also use a 200-4R 4 speed auto or a TH 400.....but these will require a different cross member.
21mm socket or wrench
They're all about standard {interchanged parts}, especially around that year, but because of that it should be almost 16 gallons (15.75}. I know that the 89 Olds Cutlass {Cruiser} has that size as do several others I've ran across.