rdv3842

1980 corvette with 305 cid, is it lock up converter, cuz i wanna change my thm 350 thm700 r4

MelWff

if it is the original transmission it has the lock up converter.

av81

Lock up converters came out in 81

v2racing

No, TH 350C trannies were in 1980 Vettes. I had one, seen lots of others.

Mike

av81

I guess I stand corrected

av81

I had to think about this cause I had a new L82 1980 and it did not have a lockup converter , here's the answer some do some dont.


The NCRS manual appendix I have lists (3) automatic trannys for 1980 (page 126):

MV4 = THM 350C
MX1 = Automatic Transmission
M33 = THM 350 (for California)

v2racing

I'm surprised the 350C wasn't used in California.

Mike

terry82

does it matter what you have?you are changing everything anyway.you will need a lockup for 700r4

DVAST8R_88

So, if it had the lockup, but not the computer that the '81 has, what enabled it to lock?
Curious because I have an 81 that had the computer stuff disconnected by a previous owner.

terry82

if you had a lock up, it was not working .if all the computer parts were disconnected,then it was not getting any info.I have changed these over on 81s and they did not have the lock up.You can look to see if you have any wires going to the tranny..If you do find lock up wires ,you cant use them for the 700r4

wajulia

Note the OP said it was a 305. 1980 California only 305CI with the ECM, Computer Controlled Carb and Turbo350 with the lockup converter -- all the same as the 1981 with a 350CI engine a year later. An obscure little corvette trivia question.