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E1 and J13/15 transmission interchange


boxboy

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I am working on a possible deal with a J15 engine, but no tranny. I have a J13 with a good tranny. Thinking of swapping because I can find parts for the 15 and not the 13, plus that good seal in the front cover is nice to have. Anyway, it is in a parts truck, and my friend has a tranny from his 65 E-1 truck. I am wondering if the tranny from the E-1 will fit the J13. I could swap the J15 into my truck, with my tranny, put the J13 in the parts truck with the E-1 tranny and resell is my idea. Do they all interchange?

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Is at least everything the same between the J13 and the J15? I am looking at a J15 that was rebuilt a couple of years ago, but hardly any miles put on it because the tranny went out. If my tranny will bolt right up, I am golden. I am assuming the clutch would be the same between these two as well as the bolt pattern.

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They used 2 different J-series transmissions. Later ones were metric, early ones weren't. There's an adapter plate on the engine that should bolt between, though the holes may be the wrong size due to the switch from SAE to Metric.

 

That being said, I have a Metric J15 in my '68, with the '68 Trans. Works fine. Don't think anything much was changed.

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That is the tranny that was on the J15 engine in the parts truck. Mine however is different. Has the flat pan on the bottom and is a single mount. My tranny will be staying in the truck, and just the J15 would be coming in in place of the J13 I am currently running.

 

Checked again. Looking at the pics, it appears that the parts tranny that no longer works, has a single mount. But the body and bell of the tranny looks the same as your pic.

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The flat pan trans is the F4W63, same transmission that was used in the 510 but with a different front case (different bell pattern). The one pictured is identical to my '65 320 trans (that was in my '64 320). It's the floor-shift version of the original 320 trans (which was column-shift).

 

Other than the obvious visual differences, as I mentioned before the main compatibility problems are the input/output shaft spline differences and the method of mounting. The 320-type trans pictured uses sort of a "saddle" mount on each side, whereas the bottom-cover trans uses a single mount with a full crossmember. My '68 520 uses the bottom-cover type, and I have the drivetrain from a '66 520 that also had the bottom-cover type, but the engines on both were NOT stock, so it's entirely possible they had their original transmissions replaced with the ones that came with the J15 and J16 engines.

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It'll bolt to the engine as long as you use the adapter plate it's currently using. The steel plate between the eng/trans is different- you need the plate that matches the transmission. The bolt pattern on all J13/J15/J16 (and probably the E1) engines is the same, the THREADS might be different due to the SAE/Metric shift that Nissan had in the late 60s. E1s are all SAE, J13s are 50/50 (depending on when they were made, and some have a mix just like 80s American cars), J15/J16s are mostly Metric.

 

The mounts apply to the truck itself. The 320 trans won't bolt to a 520, though it'll bolt to the engine just fine as long as you use the correct sandwich plate, flywheel, and clutch. Plus the driveshaft in the truck won't fit- completely different spline design. But if I read right, the parts truck doesn't have a trans anyway. It's a Parts truck, I wouldn't worry about it. Throw the "dead" engine in the bed and call it a day.

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