Trying to figure which auto trans I've got. Can anyone tell me some info on how to id my trans. I bought a 91.5 i/c motor and it came with an automatic attached and I don't know much about these autos. it's a 4x4 with a np205. Thanks

 

if it has O/D then it is a 518. if it doesn't then it is a 727. if yours is i/c then i would guess it is the 518 with O/D. good luck

 

Hey thanks a lot. I checked the shifting on it and seemed to be a three speed.... Is the o/d electronic or manual (i.e. does the shifter have 1 2 3 d or 1 2 d and a button on the shifter?) I don't have the truck, just engine and trans so I can't check my self. there are a few electrical connections on the trans, not sure how much electronics would run the 727.

 

the overdrive on the 518 will come automatically if the tps works right, but does have a button you can press to turn it off.

 

the 518 has an overdrive scabbed on to it where the tail shaft or coupler to the transfer case should be. mine has two electrical plugs on the shift linkage side. if you are going to use this combo in another make you can make the od activate via a manual switch.

 

Hey guys thanks a lot for your help. I guess i have the 518. i'm not gonna put it in anything, I was trying to figure out what it was so I can sell it. How much do you think a 518 with only 80k on will go for?? Thanks again for helping me out

 

Do you still have the 518 transmission if so how much and where you located

 

haha i need your 518 but cali is to far away

 

Sorry guys but I just sold it!!! I wish i had known I would have made you guys a deal. Sorry about that!

 

would a 92 d250 still have the 518 auto?

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would a 92 d250 still have a 518 auto?