Tranny Type.....

chevymaniactn08 · #1 03-11-2008, 05:32 PM

IHOW DO I KNOW WHICH ONE I HAVE?

I KNOW IT HAS A MODULATOR VALVE AND I WANTED TO ALSO KNOW DO THAT HAVE TO B HOOKED UP TO A VACUUM SOURCE FROM THE MANIFOLD OR CARB?

silicon212 · #2 03-11-2008, 07:48 PM

Quote:

Originally Posted by chevymaniactn08

IHOW DO I KNOW WHICH ONE I HAVE?

I KNOW IT HAS A MODULATOR VALVE AND I WANTED TO ALSO KNOW DO THAT HAVE TO B HOOKED UP TO A VACUUM SOURCE FROM THE MANIFOLD OR CARB?

WHAT CAR? AND WHY ARE WE YELLING?

chevymaniactn08 · #3 03-12-2008, 08:00 AM

sorry bout that...not yelling...i sumtimes like to type in caps...its not the original tranny and engine...

silicon212 · #4 03-12-2008, 10:52 AM

Quote:

Originally Posted by chevymaniactn08

sorry bout that...not yelling...i sumtimes like to type in caps...its not the original tranny and engine...

Well, we're not psychic! Clue us in on some details ... pan shape, etc.

PeteA216 · #5 03-12-2008, 11:07 AM

A picture of the pan would be almost perfect for identifyting the tranny.

chevymaniactn08 · #6 03-12-2008, 12:02 PM

im thinkin its a 350 cuz it has a 13 bolt pan and the way its shape

silicon212 · #7 03-12-2008, 01:31 PM

Quote:

Originally Posted by chevymaniactn08

im thinkin its a 350 cuz it has a 13 bolt pan and the way its shape

A TH350 has no external band adjustment, has a square pan with a corner cut out at a 45 degree angle, and above the cutout at the rear, facing rear, is a vacuum modulator.

A TH250 looks the same but has a band adjustment on the passenger side behind the bellhousing.

chevymaniactn08 · #8 03-12-2008, 01:52 PM

yup its a 350....i feel really stupid right now....i appreciate u guys help for all u have helped me with....but wut i jus noticed is gonna take the cake....i had the modulator valver hose goin to the port on the carb that the vacuum advance hose pose to go to...and vice versa.....i called this guy at jeg's and he informed me that having it hooked up like that would make it idle real high and eventually bog down and backfire thru the carb....do u all agree?

silicon212 · #9 03-12-2008, 05:38 PM

It wouldn't run right, but I really don't think that would cause it to pop through the carb.

chevymaniactn08 · #10 03-12-2008, 05:43 PM

so wut should i look at about the backfiring thru the carb issue?

j cAT · #11 03-12-2008, 06:04 PM

Quote:

Originally Posted by chevymaniactn08

so wut should i look at about the backfiring thru the carb issue?

check compression ,,,,,,bad valve

chevymaniactn08 · #12 03-13-2008, 08:40 AM

any tips on how to check a bad valve...i know its n the head...so do i have to take the head off to see....nevermind dumb question huh?except for the first one

silicon212 · #13 03-13-2008, 11:29 AM

Quote:

Originally Posted by chevymaniactn08

any tips on how to check a bad valve...i know its n the head...so do i have to take the head off to see....nevermind dumb question huh?except for the first one

Please refer to the other thread you posted for symptoms of backfiring. You can check the valves by running two tests - a vacuum test followed by a compression test. A bent or burned valve will show as a rapid needle fluctuation on a vacuum test, and low compression in one cylinder will confirm that along with the cylinder #.

However, it would have to be a burned intake valve and those just don't happen.

You're more looking at ignition/cam timing or a bad camshaft.

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