I don't think there are any differences other than the gears that have different tooth counts. The housing is certainly the same part. If you do start swapping internal parts, be sure to keep any shim stacks together with any related bevel gears and retainers in the original housing.
I wouldn't hesitate to swap the whole transmission. Easiest and cheapest option. Be sure to disclose to anyone in the future should you sell it. And definitely keep the old one around for parts or sell to someone for parts.
I finally got the swap. The ratios are a little different: 1& R are lower and 4th is higher in the 140 trans. The other plus is I have a tach for a 140. I was not able to find a tach for a 130.
I finally got the swap. The ratios are a little different: 1& R are lower and 4th is higher in the 140 trans. The other plus is I have a tach for a 140. I was not able to find a tach for a 130.