Hi Halver
I believe for a 1987 model with a 454 engine that your transmission 400 (GM), especially if it is a 3 speed or 3 speed with overdrive. The 454 engine with 400 trans is very reliable and common for that year. I had a 1984 tag axial Holiday Rambler 33ft with the same combo.
Enjoy your 1987 P-37
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