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#1 |
Registered User
![]() Join Date: Nov 2006
Location: Arkansas
Posts: 232
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TH350 non-lockup to lockup?
Is there any way to make this happen without getting a new tranny? With a lockup 350, does the converter lock in any gear or just 3rd? Are there performance benefits to the lockup? TIA
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#2 |
Parts and more parts
Join Date: Nov 2003
Location: Lebo, Kansas (middle of nowhere
Posts: 6,821
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Re: TH350 non-lockup to lockup?
The lock-up actually gives a small amount of mileage increase, due to dropping the RPMS slightly. My son's lock-up started messing up in his 86 and the tranny shop unplugged it, until we could get time to do the replacement with a 700R4. The change in RPMs dropped his gas mileage by about 2 MPG.
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#3 |
Registered User
Join Date: Aug 2006
Location: Bakersfield,CA
Posts: 7,893
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Re: TH350 non-lockup to lockup?
im kinda curious about the whole lock-up deal to so heres a bump for you
__________________
-steven Alte Seele S.S. "Allison" '72 C/10 LWB 350SB/TH350 - DD PITBULL IS NOT A CRIME |
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#4 | |
Registered User
Join Date: Aug 2006
Location: Bakersfield,CA
Posts: 7,893
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Re: TH350 non-lockup to lockup?
Quote:
__________________
-steven Alte Seele S.S. "Allison" '72 C/10 LWB 350SB/TH350 - DD PITBULL IS NOT A CRIME |
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#5 |
Senior Member
Join Date: Jul 2006
Location: Blountville, Tn.
Posts: 3,904
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Re: TH350 non-lockup to lockup?
the lock up part is in the converter.
A clutch has been added to the torque converter to mechanically "lock" the engine to the transmission input shaft, eliminating the "slippage" and gaining the fuel mileage that normally lost in an automatic transmission. Last edited by BarryB; 04-21-2007 at 12:46 AM. |
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#6 |
Registered User
Join Date: Aug 2006
Location: Bakersfield,CA
Posts: 7,893
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Re: TH350 non-lockup to lockup?
ah ok, i get it now, how much is a lock-up kit for a th350?
__________________
-steven Alte Seele S.S. "Allison" '72 C/10 LWB 350SB/TH350 - DD PITBULL IS NOT A CRIME |
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#7 | |
Registered User
Join Date: Aug 2006
Location: Bakersfield,CA
Posts: 7,893
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Re: TH350 non-lockup to lockup?
Quote:
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__________________
-steven Alte Seele S.S. "Allison" '72 C/10 LWB 350SB/TH350 - DD PITBULL IS NOT A CRIME |
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#8 |
Registered User
Join Date: Feb 2007
Location: Dallastown , Pa
Posts: 261
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Re: TH350 non-lockup to lockup?
They don't make a lock-up torque converter for a TH 350 .... 700r4 and 200r4 are Chevys trannies that have lock-up functions
Last edited by Evans; 04-21-2007 at 01:26 AM. |
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#9 |
Registered User
Join Date: Aug 2006
Location: Bakersfield,CA
Posts: 7,893
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Re: TH350 non-lockup to lockup?
dagnabit, ohwell
__________________
-steven Alte Seele S.S. "Allison" '72 C/10 LWB 350SB/TH350 - DD PITBULL IS NOT A CRIME |
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#10 |
Senior Member
![]() Join Date: Dec 2002
Location: Portland, Oregon
Posts: 901
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Re: TH350 non-lockup to lockup?
They do make a 350 with a lockup torque converter. Don't recall the correct numbers for it but I had one installed in a '79 Cad Seville I owned a few years ago.
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'71 GMC;fleetside;PB/PS/AC/CC/402 Eng./Custom Paint/110,000act miles/3 fuel tanks(52gal). Last edited by GMC Jim; 04-21-2007 at 06:26 AM. |
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#11 |
State of Confusion!
![]() ![]() Join Date: Jul 2002
Location: Gulfport, MS USA
Posts: 46,900
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Re: TH350 non-lockup to lockup?
The T350C are the ones with lockup converters. I believes they ran from 80 to around 86. The converters do NOT interchange. I know I tried to go the other way, making my T350C a normal T350.
The T350Cs are not real strong, so I am told, so if you want to run an engine with any guts, (modified small block) I would look at something else.
__________________
Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God! |
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#12 |
Registered User
Join Date: Feb 2007
Location: Dallastown , Pa
Posts: 261
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Re: TH350 non-lockup to lockup?
My bad then , never heard of a lock up 350
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#13 |
Senior Member
Join Date: Oct 2006
Location: Edmonton Alberta
Posts: 458
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Re: TH350 non-lockup to lockup?
all t350 trannys in the 80s were lockup including 4x4, the converters are weaker but they do make good ones if you want to pay the buck.
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#14 |
Parts and more parts
Join Date: Nov 2003
Location: Lebo, Kansas (middle of nowhere
Posts: 6,821
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Re: TH350 non-lockup to lockup?
The 350C trannys (lock-up type) were basically TH350 trannies, however the lockup converter was different as well as the input shaft (which was smaller and lighterweight) This was the downfall of that tranny design. I got over a 100,000 miles out of mine before I got the desire to go OD and real horsepower. The lockup feature is a solenoid that feeds more pressure to the converter to get rid of some of the fluid slippage in the vanes inside. This pressure ensured that the vanes aligned and the converter provided a more positive output.
A standard 350 cannot be modified for this design. You should look at an overdrive tranny and get the best of both worlds. Right now I have a 700R4 in my truck to get the OD, but I eliminated the lockup converter and installed a 2400 stall converter to make ofr the cam that I am running in my 383 motor. I get the stall feature and lower RPMs on the highway. I have over 400 horses and get 15 mpg on 3.73 gears. I realize that is not outstanding in thsi day and age, but there are cheesy Toyotas getting the same in their little trash bins and they can't kick a Mustang's butt for nothing. |
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#15 |
Registered User
![]() Join Date: Nov 2006
Location: Arkansas
Posts: 232
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Re: TH350 non-lockup to lockup?
Thanks guys. Well I guess I'll stick with my non lock-up then.
Grease--do whatever you want to man, your questions will probably help me too! |
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