Transmission swap for LD20T-II

Discuss (and cuss) the Nissan LD-series OHC Six diesel engine, popularly available in the US in 1981-83 Datsun/Nissan Maxima Sedans & Wagons.

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wbrproductions
Posts: 29
Joined: 17 years ago
Location: Seattle, WA, USA

Transmission swap for LD20T-II

#1

Post by wbrproductions »

Starting a new thread, to continue my redirect ( :oops: ) of the Oil Filter reference thread...

Following davehoos (and others) advice, I purchased and received a 5-speed MT from an 83 280ZX (non-turbo), to be adapted for my LD20T-II. I also have the MT that shipped with the engine, which is a cable-shift 5-speed from a mid- to late-80s Homy variant.

A few posts have indicated that I need to trim about an inch off the input shaft of the 280zx MT to fit the LD20T-II w/o bumping into the flywheel. Anyone know if I can just swap out the input shaft from the Homy MT instead?

On an unrelated note, the Homy MT will be redundant after I've mated the 280zx MT to the engine, so if anyone wants it, it's yours for the shipping cost. Pix of the stamped case numbers are back in the Oil Filter reference if anyone is interested.

Thanks in advance,
wbrproductions
Jamming an LD20T-II into an 89 Nissan D21 p'up
wbrproductions
Posts: 29
Joined: 17 years ago
Location: Seattle, WA, USA

shifters

#2

Post by wbrproductions »

And, on a related note but different task... The shifter hole in the toyota body is going to line up about 4" forward of the tranny shift mount bracket. Anyone aware of an angled Nissan shifter that might
Jamming an LD20T-II into an 89 Nissan D21 p'up
davehoos
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#3

Post by davehoos »

imput shaft and constant mech gears are matched set-they can have different numbers of teeth or shape to the teeth-these can be swaped as individual or a set as long as you know what matches up.

I would expect a 3.5 or 4.2 ratio first gear with a homy.


280ZX i expect to see a 3,23:1 close ratio box.
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wbrproductions
Posts: 29
Joined: 17 years ago
Location: Seattle, WA, USA

#4

Post by wbrproductions »

After finally receiving the tranny from UPS, I've had a chance to compare it with the one that came with the LD20T-II. There appears to be no difference in shaft length, depth, width, etc. The only difference is a slightly taller (~1 cm) throw-out bearing.

Is it possible I don't have to trim this shaft at all? If not, this transmission will bolt in nicely, and the shift linkage location should even match the existing hole in the truck body.

Seems like I got a lucky break :D

Just for reference, 83 280ZX 5-speed:
Image

and Homy 5-speed:
Image
Jamming an LD20T-II into an 89 Nissan D21 p'up
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asavage
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#5

Post by asavage »

wbrproductions wrote:Is it possible I don't have to trim this shaft at all?
Angrylance's trans had to have the output shaft trimmed, not the input.
Regards,
Al S.

1982 Maxima diesel wagon, 2nd & 4th owner, 165k miles, rusty & burgundy/grey. Purchased 1996, SOLD 16Feb10
1983 Maxima diesel wagon, 199k miles, rusty, light yellow/light brown. SOLD 14Jul07
1981 720 SD22 (scrapped 04Sep07)
1983 Sentra CD17, 255k, bought 06Jul08, gave it away 22Jun10.
wbrproductions
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Location: Seattle, WA, USA

#6

Post by wbrproductions »

aha, thanks. Reading glasses on now... 8^)
Jamming an LD20T-II into an 89 Nissan D21 p'up
DerekG
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Correction

#7

Post by DerekG »

Just catching up on some old posts. Angry Lance cut 1/4" off his trans input shaft, not his output shaft. I was at his house when we figured out what was binding. He is much better at that "machining" stuff than typing since he typed the wrong shaft. I would imagine since this thread is a couple months old you already know, but in case you are wondering why you are cutting the output shaft, you are not supposed to be cutting that shaft. The input shaft is what needs trimmed (which should be clear by him saying it was binding on the flywheel), even though he said output shaft in his thread. Sometimes he's a bit of a donkey brain...
wbrproductions
Posts: 29
Joined: 17 years ago
Location: Seattle, WA, USA

#8

Post by wbrproductions »

OK, thanks much for the heads up. However, I haven't found that to be the case for some reason - my input shaft did not bind when I linked up the engine to transmission to test the setup. Everything slid right together.

I did NOT try running the engine like this or shifting between gears, so maybe I'm not aware of whether it's binding or not. If you believe I must do this regardless of how it looked after bolt-up then I'll go have this done... Please confirm.

Thanks!
Jamming an LD20T-II into an 89 Nissan D21 p'up
wbrproductions
Posts: 29
Joined: 17 years ago
Location: Seattle, WA, USA

#9

Post by wbrproductions »

And just to provide all available information...: The input shaft in the transmission that was original to the engine appeared to be exactly the same length and depth as the one from the 280ZX tranny, so I can't imagine why the latter would need to be trimmed.
Jamming an LD20T-II into an 89 Nissan D21 p'up
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