350cortina
Forum Newbie
Posts: 10
Age: 27
Loc: Durban,South Africa
Reg: 06-13-12
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06-14-12 06:10 AM - Post#2237010
Hi people! Can anyone let me know what the side effects of running the TH350c without hooking up the lock up wiring?
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Allan In NE
Contributor
Posts: 922
Reg: 12-27-11
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06-14-12 06:21 AM - Post#2237013
In response to 350cortina
Side effects?
None really, other than the 8% loss in fuel effeciency.
Allan
| Lifelong GM automatic transmission specialist |
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Mr. Sinister
Contributor
Posts: 394
Age: 35
Loc: Fair Hill, MD
Reg: 05-18-09
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06-14-12 06:49 AM - Post#2237018
In response to 350cortina
I run non-lockup on my th350. Can't comment on mileage since it's always been like this, but it's not great. Probably will go with a lock-up convertor next time, though.
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350cortina
Forum Newbie
Posts: 10
Age: 27
Loc: Durban,South Africa
Reg: 06-13-12
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06-14-12 08:12 AM - Post#2237045
In response to Allan In NE
Thanks for the input.
| 'Natural ability without education has more often raised a man to glory & virtue than education without natural ability' |
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350cortina
Forum Newbie
Posts: 10
Age: 27
Loc: Durban,South Africa
Reg: 06-13-12
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06-14-12 08:18 AM - Post#2237049
In response to 350cortina
Is the TH350c & TH200-4R torque converters the same? Cos the input shaft looks alike but i dont see any plug for the lock-up on the gearbox housing.
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motorman
Super Senior Member
Posts: 5038
Loc: south western pa.
Reg: 01-25-00
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06-14-12 12:32 PM - Post#2237132
In response to 350cortina
Hi people! Can anyone let me know what the side effects of running the TH350c without hooking up the lock up wiring?
there is a lot of slippage when using a lockup converter in the non lock up condition which could heat up the fluid under certain conditions
| retired race engine builder,former NASCAR tech inspector. new corvettes owned 1959,1962,1963,1964,1965, 1966,1997,1999,2002,2005, 2008 plus 30+ other chevy cars and trucks along the way |
Edited by motorman on 06-14-12 12:33 PM. Reason for edit: No reason given.
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 62chevy427
"7th Year" Silver Supporting Member
Posts: 1519
Loc: laurens sc
Reg: 04-13-06
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06-14-12 07:50 PM - Post#2237258
In response to 350cortina
around town it will be o.k. on a long road trip it may overheat due to converter slippage.
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Allan In NE
Contributor
Posts: 922
Reg: 12-27-11
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06-15-12 06:07 AM - Post#2237354
In response to 62chevy427
around town it will be o.k. on a long road trip it may overheat due to converter slippage.
Sir,
This is 100% non-personal towards you in any way shape or form.
But, can't help but wonder who dreams up these silly stories, anyway? This idea is pure, prime #1, USDA inspected bunk.
Allan
| Lifelong GM automatic transmission specialist |
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motorman
Super Senior Member
Posts: 5038
Loc: south western pa.
Reg: 01-25-00
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06-15-12 06:51 AM - Post#2237363
In response to Allan In NE
around town it will be o.k. on a long road trip it may overheat due to converter slippage.
Sir,
This is 100% non-personal towards you in any way shape or form.
But, can't help but wonder who dreams up these silly stories, anyway? This idea is pure, prime #1, USDA inspected bunk.
Allan
i got a letter from GM when i bought my 88 silverado never to tow in OD because the converter would be unlocked all the time and cause overheating. they even sent a lock in type dip stick and a extension for the trans vent so it pointed away from the cat convertor. the RPM difference at 65 MPH is about 600 RPMs in verses out of lockup
| retired race engine builder,former NASCAR tech inspector. new corvettes owned 1959,1962,1963,1964,1965, 1966,1997,1999,2002,2005, 2008 plus 30+ other chevy cars and trucks along the way |
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models916
Frequent Contributor
Posts: 1941
Age: 62
Loc: Addison, IL
Reg: 05-28-10
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06-15-12 10:45 AM - Post#2237433
In response to motorman
The 350 is NOT an OD transmission. In drive it will not overheat locked or NOT. It will be running 1-1.
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Allan In NE
Contributor
Posts: 922
Reg: 12-27-11
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06-15-12 11:34 AM - Post#2237453
In response to motorman
around town it will be o.k. on a long road trip it may overheat due to converter slippage.
Sir,
This is 100% non-personal towards you in any way shape or form.
But, can't help but wonder who dreams up these silly stories, anyway? This idea is pure, prime #1, USDA inspected bunk.
Allan
i got a letter from GM when i bought my 88 silverado never to tow in OD because the converter would be unlocked all the time and cause overheating. they even sent a lock in type dip stick and a extension for the trans vent so it pointed away from the cat convertor. the RPM difference at 65 MPH is about 600 RPMs in verses out of lockup
Yes Sir,
I know all about the vent and dipstick recalls. Worked for GM the better part of a lifetime and installed a couple trainloads of the goofy things.
Yes, you NEVER tow in OD; I've seen those converters get so hot that they turned blue.....and the smell. You cannot describe that gastly odor; ya absolutely gag. 
All said and done tho, this man is asking about a 350C transmission, which is nothing more than a run of the mill 350 but equipped with a clutch.
Doesn't hurt 'em a bit to run without the lockup. Just look at the millions upon millions of the hydramatics up thru the 350/400/325s that didn't have a lockup. None heated due to converter slip; it was how they were designed.
You're talking apples and oranges, Pard. 
Allan
| Lifelong GM automatic transmission specialist |
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350cortina
Forum Newbie
Posts: 10
Age: 27
Loc: Durban,South Africa
Reg: 06-13-12
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06-16-12 05:15 AM - Post#2237742
In response to Allan In NE
Great info & truly makes alot of sense,u have put my mind at ease,was a bit worried about it not running full oil pressure without engaging the lock up...Thanks Allen 
| 'Natural ability without education has more often raised a man to glory & virtue than education without natural ability' |
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350cortina
Forum Newbie
Posts: 10
Age: 27
Loc: Durban,South Africa
Reg: 06-13-12
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06-16-12 05:19 AM - Post#2237743
In response to Allan In NE
Would running the stock converter with a cam that calls for 3000rpm stall damage the tranny or stock converter in anyway. Or does it jus effect the way the car pulls from the line?
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