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Gen 1 Auto trans question


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10 replies to this topic

#1 SUBARU3

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Posted 20 December 2005 - 01:28 PM

Apparently, they used 3 different types of automatic transmissions in the Gen 1s

Aisin Warner M41
Aisin Warner M41A
Jatco L3N71B

I thought they were all the same. Anybody have an idea on this?

Thanks, Todd

#2 NorthWet

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Posted 20 December 2005 - 02:08 PM

Ummm... what kind of idea do you want? Not that I am likely to provide you with much info, but you never know.

#3 SUBARU3

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Posted 20 December 2005 - 02:50 PM

If they did indeed use 3? If these were it? Was one particular one the main one used? How can I tell which one I have? Are the 2 with the same name basically the same?

#4 tailgatewagon

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Posted 20 December 2005 - 09:20 PM

what year are you talking. or year range. i can lookin my factory parts books and see the application. i have 68-79 parts books so i should have it covered....

#5 tailgatewagon

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Posted 20 December 2005 - 10:02 PM

Trans Part number 340258710
this is for the trany case...without the front diff...
covers years.

1977(stage1) and 1977(stage2), 1978
HT, 2d,4d sw(DL)

340253600 1975
HT GF, Coupe GL, 2dr DL, 4dr DL, SW DL,

no auto trany listed in my book for
1972, 1973(stage1) 1973(stage2) 1973(stage3) 1974



all the pix of auto tranys i could find for 75-79 they all looked the same. some part numbers were differnt. and may just be superceded.

anyway i hope this helps.

#6 SUBARU3

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Posted 21 December 2005 - 01:48 AM

Thanks for looking and your time. I'm mainly interested in 77-79. I can't seem to cross the actual trans manufacturer with the year/Part #.

Todd

#7 GLCraig

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Posted 21 December 2005 - 03:07 AM

Well if this helps, the only Gen1 auto I ever scrapped out was from a 78. Execpt for the bellhousing, I could not tell a difference between it and a Gen2 2wd Auto.

#8 NorthWet

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Posted 21 December 2005 - 12:56 PM

If I were a betting man (I am not :) ), I would say that if you had one it would probably be the JATCO unit, as it was used in the later cars. The M41 and M41A are probably near-twins (with each other); some relatively minor refinement. (BTW, the JATCO core was used in several other Japanese cars.)

Parts stores have asked me which 3AT I was buying a pan gasket for, as they are different shapes. This may be your best external distinguishing characteristic. If you take the pan off, the valve body should be marked with transmission ID.

#9 SUBARU3

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Posted 21 December 2005 - 02:08 PM

Thanks for all the info! It looks to be the Jatco.


Todd

#10 moosens

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Posted 21 December 2005 - 04:52 PM

I'm pretty sure the M series was from '74 - '77 stage I.It's shown in the '74 Auto Trans SM


Posted Image
Hope that helps.

If that tranny was the "A" then I'm guessing the M41 was the Japanese version.That looks like any stage I auto that I can recall,doesn't it?

#11 SUBARU3

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Posted 21 December 2005 - 05:15 PM

Hmm....that looks like mine!


Thanks Paul!!




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