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#1 |
The Crazy Machanic
Join Date: Jan 2007
Location: Nokesville Va
Posts: 1,437
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th350 build mod
I had the 350 in my manual truck and it would burn tires off and do donuts with out problems. Im know putting that moto in a automatic i liked the response i got from the manual and i know no auto will do want a manual can but what can i do to a th 350 to make it more racey. I will be change the rear to a 373 after some time is a 308 now.
But like i said what can i do to a th350 to make it more stout for the motor remember this is a dd street car and will be drivin daily i just want more umf from the tranny (was look at a b&m shift improver kit cost 31.95) (tranny has to be rebuilt anyway im at about 400 now for that shift kit and rebuild) Last edited by Srubydo1986; 02-21-2007 at 03:31 AM. |
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#2 |
K5Camper
![]() Join Date: Mar 2004
Location: Pueblo, CO
Posts: 1,513
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Re: th350 build mod
I've used a kit called a no-go shift kit. Funny name, but it's low cost and low modification. Bore out a couple of holes in the valve body plate and a couple of other minor tweaks and you are done. Not a full on race trans, but it snaps gears pretty quickly when you are on it (shifting manually). Leaving the shifter in Drive and it still shifts smooth with a new firmness. Nothing neck snapping, Just not a rubber band type shift it used to make.
Keep this in mind, all you are doing is playing with shift quality with a basic shift kit. you aren't really beefing the trans much at all. IF the trans is old and you start hammering on it you might still break something. Heck with the mild 350 in my Nova I managed to shatter a clutch retaining ring with nothing more than hitting 2nd gear hard manually. Bang! second gear was gone. That was with a 350 running a cast iron 4bbl intake, qjet and a very tame cam with stock exhaust manifolds.
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Rob Z. 1975 K5 350/465/205/D44/12b 4" lift on 35's- RIP 1991 K5 8.1L/NV4500/241/D44/14b FWC Camper |
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#3 |
Registered User
Join Date: Sep 2005
Location: Sun City West, Az
Posts: 3,822
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Re: th350 build mod
i'm no mechanic.but i have read where th350's can do alot.people run them with big blocks.it has alot to do with stall converter.i've seen after market custom builders warranty them to 600 h.p.
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" Never look up a dead dogs butt." ![]() Last edited by boatpuller; 02-21-2007 at 11:08 AM. |
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#4 |
Registered User
Join Date: Jan 2004
Location: Duluth, Mn
Posts: 162
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Re: th350 build mod
My TH350 has been putting up with 650hp or better for a couple of years now since I rebuilt it myself. Manual valvebody, hardened sprag race, and new alto red eagle clutches with kolene steels are the only things not stock in mine. Most cheaper rebuild kits don't have very good clutches so stay away from them and if you can, replace all the thrust washers in it with torrington bearings as I have been told that this reduces a ton of heat and frees up a bit more power.
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85 GMC 1/2 ton LWB 4150lbs. 383 SBC with Twin MPT70 Turbos 850 CSU carb TH375 3.70 gears Ultimate 10" Converter 10.11@136.6 with 1.64 60ft. on 10.5-31-15W ![]() |
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#5 |
The Crazy Machanic
Join Date: Jan 2007
Location: Nokesville Va
Posts: 1,437
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Re: th350 build mod
I was kinda looking at this im a b&m fan and never heard bad things
http://www.bmracing.com/index.php?id...t=19&subcat=24 |
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#6 |
7000 #'s of american IRON
Join Date: Dec 2004
Location: north tx
Posts: 883
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Re: th350 build mod
My question: What exactly is a full-manual valvebody? Does that disable drive and "reassign" it as third gear? I drive my truck (454/400) as a manual every now and then (i do the pedal work like an unsyncro manual- off the gas for upshift and tapping it for downshift to save the clutches) and it's actually kinda fun. and thankfullly, it shifts regardless around 4500 RPM...dont ask how i know.
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#7 | |
needin' money
Join Date: May 2005
Location: Chickasha, Oklahoma
Posts: 1,106
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Re: th350 build mod
Quote:
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SWB Stands for Short Wide Bed |
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#8 |
7000 #'s of american IRON
Join Date: Dec 2004
Location: north tx
Posts: 883
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Re: th350 build mod
If you've driven an unsynchro'd transmission, you have to match the engine and input shaft speed using something other than the clutch, especially with a wide ratio box. In a synch'd transmission the synchro's do it for you.
might be otherwise known as the "heal-toe" technique. |
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#9 | |
needin' money
Join Date: May 2005
Location: Chickasha, Oklahoma
Posts: 1,106
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Re: th350 build mod
Quote:
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SWB Stands for Short Wide Bed |
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#10 |
7000 #'s of american IRON
Join Date: Dec 2004
Location: north tx
Posts: 883
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Re: th350 build mod
just to have fun. I can hear the clutches screaming if i shift while my foot is still in it and the shift takes forever.
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#11 |
Right turn Clyde
Join Date: Nov 2002
Location: Cincinnati, Ohio
Posts: 2,911
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Re: th350 build mod
Full manual valve body is mainly for the track. You have to shift every gear every time. You have to shift the transmission just like a manual transmission but no clutch. That's not to say its a manual now. Just have to shift gears constantly like one.
The reason why your th400 shifts out of first is that it is a over rev protection. You can make it hold 1st gear as long as you want if you install a plug in the valve body. About the only thing you can do to the th350 is get a higher stall convertor. But it kind of defeats the real perpose of needing one. It also isnt a very good idea to put money into a weak and failing transmission. I would go with a Transgo shift kit/ shift improver after it gets rebuilt.
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1974 C25 LWB: 454 4bbl Carb / TH400 / 3.73 1992 Camaro RS 305 TBI |
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