79 cutlass supreme crossmember??

[chicago2tacoma]

Currently have 200c trans and want to switch to th350 am I going to have to get a new crossmember I have heard different thingshave also heard the moter mounts for 260 v8 olds will work on sbc just need to put in different holes on frame true or false??

 

[Blake442]

Trans crossmember is the same for the THM-200 and the TH-350, so you're fine there unless you want clearance for true dual exhaust.

False. Motor mounts are completely different between Olds and Chevy.

 

[DrRansom442]

mounts are the same for ALL Olds engines though .... just thought you'd like to know!

 

[chicago2tacoma]

Thanks ....I do want true duels but the shop said no new crossmamber that they would somehow work around it.......$280 from headers back 380 for flowmasters.....what should I do?

 

[79loserbluebu]

Most likely they will either run the exhaust like the 442's and MCSS's had them, in which it's just like a fake dual exit exhaust, or they will modify the original crossmember. I have a friend that took the stock crossmember and put it in a press and pressed it down on the driver side to clear the exhaust. I'm a fan of the Pypes kit myself.

 

[DrRansom442]

you can modify the factory X-member or companies like Gforce do make brand new dual hump Xmembers for the th350 in a G-bodies!

 

[thedoctorisin]

anyone have any pics of a modified cross member? would it be a better idea to modify it in the car or out of the car? Like cut it and tack it so its true to fit then pull it then weld it?

 

[carmangary]

Can't you just run both pipes to the passenger side?

 

[joe_padavano]

Can't you just run both pipes to the passenger side?

You can, but it both complicates the plumbing (read: adds cost) and increases restriction with the additional bends. It also lowers ground clearance since you have to pass under the driveshaft.