Bought my 84 720 under the impression it needed a clutch. Engine runs great and I felt the clutch could be the culprit when I had the engine running and could throw the trans in any gear without any issues without using the clutch. Checked fluid level and slave motion. All looked ok. Proceeded to remove trans in hopes of seeing a clutch fiber furball. To my surprise. No furball. Clutch disc looks relatively decent. So I grabbed the input shaft and the output shaft and could spin them independently of each other regardless of what gear it was in. Seems as if a shaft broke or a gear or something. Very noisy and no fluid came out when I pulled the driveshaft.
My question pertains to a replacement. I have a spare S13 KA trans sitting in my storage truck. Bellhousing of course is identical. However, the shifter bolts in whereas the truck pops in and is held in via the mounting plate. Is there anything I can do with the KA trans? Parts? Simply swap it in and maybe trim the opening and use it?