1984 Trans AM 5.0 engine
I am looking for a part# for the negative battery cable, be it AC Delco or GM OR an aftermarket source.
Would 4SD25X be correct for AC Delco. I assume that "25" means 25 inches

 

I don't know the part number, but why not just order one for your year, make, & model? That's what I did...

 

If I was home I'd look it up in the gm parts book for ya

 

Here’s a picture of the factory negative battery cable in my 1984 TA

 

I found the part# on the cable but searching that # reveals nothing. Off to Rockauto.

 

GM part book lists number 12003646. It's a service replacement cable so it's not exactly like the original and also fits a few other GM vehicles. Discontinued in 2006 but
there is some new old stock still floating around.

AC Delco lists part number 4SD30X as a currently available replacement. Appears to be a reboxed aftermarket Standard Motor Products battery cable.

 

Tkx for all the info guys. Much appreciated. I checked out Rockauto & 4SD25X s/b the correct cable. Somehow along the way a previous owner, damaged the threads on the cable "bolt" to the battery. Had to replace the battery (died) & the "bolt" would not gain enough catch to attache to the battery. Had to do some filing on the battery negative receiver.

 

Our Cars are lacking in the Battery Power Connections...
Now is a good time to upgrade.

If you are not in a situation where DIY will work for you...
Take a look at CE Auto Electric Supply.
They offer Custom Battery Cable Services:

CE Auto Electric Supply