General Category > Lobby

Looking for some advice on a stock sbc 350 build

<< < (6/6)

77cruiser:
You have the detent cable hooked up & adjusted?

Mudsport96:
Are you running the 4.10s and 32 inch tires yet or still short tires?
Do you know what gear ratio the vehicle that the th350 came from had? If not I'll throw a few random things out.

If it had a 2.56 gear and you are running a 4.10 the governor is spinning roughly 60 percent faster than it would have in the original application.
Most let's say caprice and malibu cars in the 70s to 80s were cammed for economy so at WOT they would probably shift around 4200 to 4500. What is 63% of 4200..... 2700. So if the tach is relatively accurate it should shift where it is. You could try grinding some material off of the flyweights, or see if a local transmission shop can get a governor for a th350 with a higher gear.

tschmitt:
Thanks for the replies fellas. I changed to 3.42 gears, still with 32 inch tall tires though. Kickdown cable is hooked up and adjusted correctly, passing gear works flawless. I'm going take the governor out and slowly take off some material from the inner and outer weights. From what my research shows the inner weights affect more of the 1-2 shift, outer weights more of 2-3 shift. I'll be using a gram scale to measure all of them to start with and slowly come down from there. I'm not sure what the th350 came out of but I'm sure I can get this dialed in to what I'm looking for. Just some trial and error.

Mudsport96:
That is one way to go about it.
I just left mine as it is. And like yours at WOT it shifts at like 2500 to 2700 1-2 and 3000ish on the 2-3.
I left it like this so my daughter can drive it and not have it get away from her if she floors it.
So I just manually shift it at 5500. It makes for nice low rpm around town driving shifts.

tschmitt:

--- Quote from: Mudsport96 on August 03, 2024, 03:19:14 PM ---That is one way to go about it.
I just left mine as it is. And like yours at WOT it shifts at like 2500 to 2700 1-2 and 3000ish on the 2-3.
I left it like this so my daughter can drive it and not have it get away from her if she floors it.
So I just manually shift it at 5500. It makes for nice low rpm around town driving shifts.

--- End quote ---

I can understand that. From my understanding with how the th350/th400 works is the vacuum shift modulator has more affect on the part throttle aspect (firmness and RPM range) vs the governor at WOT so it shouldn't have too much of a affect on just daily driving. Not saying it won't change it at all but from what I have gathered it will not change the part throttle shifting to say 4,000+ RPM during daily driving like it will for WOT.

Navigation

[0] Message Index

[*] Previous page