727 trany question

[tguss]

i just pulled a 360 four barrel motor and trany out of a 1980 rv with 54,000 miles what is the electrical plug on the trany for ? its by the shifting linkage.. sorry for no pictures. also under hood it says heavy duty 360 whats heavy duty about it ? it does have the 596 heads on it.

 

[69MOPE]

That 727 is junk, it is a lock-up convertor.

 

[TrailBeast]

If it's by the shift linkage and has three pins it's the neutral safety switch and reverse lights switch.

If the input shaft of the trans has a smooth end on it about 3/4 of an inch long, then it's a lockup (Overdrive) trans.

 

[tguss]

i take it that its not a lockup here is what my shaft looks like. thanks for the help .

 

[tguss]

what do they mean by heavy duty ?? its a four barrel motor 360 , is this better then the 2 barrels ??

 

[moper]

It's heavy duty emissions pacakge. Internally there's nothing different and what you should have is a plain 727A transmission. A heavy truck would not have a lock up - that was for light duty stuff back then and the input picture is a plain 727. Great find. Teh heads are someof the best LA heads you can get and the transmission should have the 4 pinion planetaries and 4 disc front clutch, plus the "factory high stall" convertor.

 

[oliver]

That 727 is junk, it is a lock-up convertor.

why would it be junk??? the early lock up converters have pretty weak tcc's but you can get after market built ones that can handle plenty of power. lockup is a great way to free up some power, lower the amount of heat generated, and drop the rpm's a bit in 3rd.

If the input shaft of the trans has a smooth end on it about 3/4 of an inch long, then it's a lockup (Overdrive) trans.

Lockup doesnt mean its a 4 speed.

 

[TrailBeast]

why would it be junk??? the early lock up converters have pretty weak tcc's but you can get after market built ones that can handle plenty of power. lockup is a great way to free up some power, lower the amount of heat generated, and drop the rpm's a bit in 3rd.




Lockup doesnt mean its a 4 speed.

This is correct, and that's not a lockup anyway so he's good.

No it doesn't.
It means it would be a converter lockup overdrive.

 

[tguss]

thanks alot guys , helped out alot. .