c3 transmission question

wrote:
> On Apr 15, 2:12 pm, "Dad" > wrote:
>> > wrote in message
>>
>> ...
>> On Apr 14, 1:37 pm, "Dad" > wrote:
>>
>>
>>
>>> > wrote in message
>>> ...
>>> On Apr 13, 6:20 pm, "spud" > wrote:
>>>> Do you think it would benefit from adding something into it as
>>>> someone
>>>> else suggested BEFORE I change the fluid and filter - maybe run it
>>>> for
>>>> a few hundred klicks or so first?
>>>> I agree with PDDeen. Those fix-its in a can can also do damage.
>>>> Have
>>>> the
>>>> fluid changed by a good transmisson shop and make sure they drain
>>>> the torque
>>>> converter.
>>>> Spud
>>> #OK - How does one ensure they drain the torque converter? Is this
>>> the
>>> #sort of thing one can do at home? I may have mentioned I have a lot
>>> of
>>> #things I have to do to the beast anyway - like brake caliper
>>> #rebuilds, new composite rear spring, shocks, etc, and I think maybe
>>> a
>>> #new rad support.
>>> Three ways to drain a converter, take it out and pour out the fluid
>>> or
>>> drill a hole in it and then plug it before you refill. Most of the
>>> time you can unhook the return line while running and let it pump
>>> new
>>> fluid through the system until you get no more old fluid. Not an
>>> easy
>>> task but it works, but in most cases not necessary.
>> I am ordering the bits and pieces I require, but how do I determine if
>> I have a THM 350 or THM 400 to make sure I get the right parts? A 1976
>> automatic with L-48 engine.
>>
>> Thx & regards.
>>
>> Pan shape, 350 has one angle cut to keep it from having 90 degree
>> corners, the 400 has 3 of the corners not square and is bigger.
>
> Yes - thanks I checked and mine appears to be a TH350 from what I see
> of the pan shape. As an aside I called the dealership and they wanted
> $240 + tax to change the transmission fluid. I asked them what they
> did for that (I thought maybe some special machine flush) but that was
> just to drain the fluid and replace filter and gasket. They told me
> $80 for the filter. I checked with corvette central and a filter and
> gasket is $12.95 I think. Am I misunderstanding something? I can see
> it is a bit of a messy job, but ......

Dealership? Hadn't you heard, cars aren't moving of the lot at the
moment, gotta pay the bills somehow!