From: bowmanj@csn.org (Jerry Bowman)
Subject: Re: TH350 transmisison stall speed
Organization: University of Colorado Boulder, OCS
Date: Mon, 4 Jan 1993 16:00:37 GMT

In article <93004.002357IO10702@MAINE.MAINE.EDU> Merv <IO10702@MAINE.MAINE.EDU> writes:
>In article <C0AKFG.4At@moxie.hou.tx.us>, hackney@moxie.hou.tx.us (Greg Hackney)
>says:
>>
>>I have a '77 Vette with a hopped up smallblock engine and
>>a TH350 transmission. Unfortunately I don't know all the exact
>>rebuild details as it was done several owners ago.
>>
>>I do know that the TH350 was rebuilt and a shift kit of some
>>sort put it it. When shifting either automatically or manually, it
>>immediately bangs the gears into place.
>>
>>It all works desireably, except that it seems to have an almost zero
>>stall speed. It has major forward creep even at 500RPM, which is about
>>as low as I can get it with the rough idle cam in it. Even at that RPM,
>>it revs back up to about 1200 RPM when placing it back into park.
>>There is an annoying drive train jolt when going from park
>>into drive, or from drive into reverse, etc.
>>
>>As a result of the low stall speed, the gas mileage is probably
>>better, but it is a dog off the line. It is difficult to even
>>break the tires loose off the line (soft Goodyear Eagle GT+4 255x60x15
>>with a 3.55 posi.) But is great in a rolling stomp race.
>>
>>I guess my question to the net is: Is there any stall speed adjustment
>>on the TH350, or is it entirely a torque converter function?
>>
>>I've had my eye on a B&M torque converter that says it's for a TH350,
>>and has a higher stall speed. However it says it's not for transmissions
>>with automatic lock-up. How do I determine if my TH350 has auto-lockup
>>or not?
>>--
>>Greg Hackney
>>hackney@moxie.hou.tx.us
>>
>In most transmissions the stall speed depends on the converter.
>However, it can be affected by high torque and horsepower outputs.
>As for being a lock up, I believe that the tranmissions that use
>the lock up converter are the overdrives.  ie TH-700R4 & TH-200R4.
>Comments?
>-Merv
     There are  TH350's with lock up.  If you have a lock up converter
    and it is working, drive at a steady say 50 mph, hold the gas pedal 
    steady and depress the brake pedal slightly, enough to light your
    tail lights.  If you have a lockup converter it should unlock and your
    RPM should increase by 400 - 500 RPM. There are other ways to tell
    but this is the easiest.>-------------------------------------------------------------------------
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