Chevy & GMC Vans

i have to replace the cat on my wifes 96 astro , does anybody know the pipe size in & out of the cat converter ? it looks to be 3 " but with out cutting it i can't get an exact size .I can get a universal but just need to know what size pipe first .

Should be 3". The SPB as well the Y pipe off Peter's 97 are both 3"in/out.

wrap a piece of string around it, measure the string and divide by 3.14159. that'll give you the o.d. on the pipe.
not bad for public school math eh?

kings-x59 wrote:wrap a piece of string around it, measure the string and divide by 3.14159. that'll give you the o.d. on the pipe.
not bad for public school math eh?

lol atta boy, way to use the smarts

blind squirrel picks up an acorn every now and then...

yes vances van had 3in also.
Danny

Thanx for all your help guys , i bought an aftermarket cat online for a whopping 23$ delivered !!! had to a little cutting & welding but its in & working great .

thats great to hear skip!
Danny

Just beware, the cheap cats may only last for one year, you may have to fit another one for your next smog.

no smog test here darren just a visual & a plug in of the aldl port. to check for codes.

Ah, all you lucky people...... But you are gonna get a shock in the future, new smoglaws are gonna be coming into effect for all the 50 states.

my cat is from eastern catalytic 45.00 and still goin strong for 4 years now. .what thats about cheap ones....