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#1 |
Registered User
Join Date: Mar 2004
Location: Arizona
Posts: 8
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transmission crossmembers
Hello everyone, my question is a simple one. Is there a difference in the tranny crossmembers between 1978 and 1979(no converter vs. converter)? Thanks for the help.
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#2 |
BAD BOW-Silverado XST
Join Date: May 2000
Location: Senior Member from Austin, TX
Posts: 6,431
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What you mean by converter?
No the transmission crossmembers will interchange. The design might be different but the mounting holes are the same. Welcome to the board. |
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#3 |
Stepsides Are Bedder
Join Date: Feb 2004
Location: Norco, CA
Posts: 238
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Tranny Crossmembers
Welcome to the board!
The short answer is, from what we saw today, yes.. The one that was for the catalytic converter had a dropped section just past the tranny mount area and below the drivers seat. It was obvious the converter should have mounted above the crossmember. Then it wrapped around the bottom of the drivers side frame rail and up the side. It bolted on the passenger side inside the frame rail - outside on the vertical section of the frame on the drivers side. Kinda weird looking. The one that we bought was from an earlier truck (without the key in the column...not sure what year) and it went straight across, with a slight dropped section in the middle, p/n 3999964 stamped in it. Hope this helps! |
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#4 |
Registered User
Join Date: Mar 2004
Location: Arizona
Posts: 8
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Thanks for the welcome and the replies. Specifically, I need to know about exhaust clearance. It dosent look to me like an exhaust pipe will clear the top of the crossmember on the drivers side. This mount comes straight across to the trans and then dips to clear the catalytic converter on the passenger side. The exhaust splits out of the converter and becomes duals. I am installing headers and 3" pipes. You can understand my confusion.
I know that 78 had full duals, 79 did not. Thats why I wondered if the crossmember was different. Thanks again for the warm welcome. |
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#5 |
You get what you pay for
![]() Join Date: Dec 1999
Location: Cherryville, NC
Posts: 4,798
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Sounds like you have one for 88 up. Our trucks had the cat on the drivers side.
__________________
Mike 1985 Chevy C-10 |
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#6 |
Stepsides Are Bedder
Join Date: Feb 2004
Location: Norco, CA
Posts: 238
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Well, you can always do what we do, assuming you have a local pick-a-part yard nearby...just take your tape measure, get some measurements of what you need, and go crawl under some trucks.
There is something weirdly sexy about a woman with greasy hands, so if you can talk your wife/girlfriend/significant other into going with you, all the better! |
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#7 |
Registered User
Join Date: Mar 2004
Location: Arizona
Posts: 8
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I suppose somewhere along the way somebody changed it. I never gave that athought since all the numbers match. I'm not fond of crawling under things out here, scorpions you know. But that is the easy way to find out Thanks for the help.
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#8 |
Right turn Clyde
Join Date: Nov 2002
Location: Cincinnati, Ohio
Posts: 2,911
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Does it look like this?
Or this?
__________________
1974 C25 LWB: 454 4bbl Carb / TH400 / 3.73 1992 Camaro RS 305 TBI |
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#9 |
Registered User
Join Date: Mar 2004
Location: Arizona
Posts: 8
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well of course at my age, brain death does begin to set in.it looks more like the first one but flatter on the passenger side( about 4" to the floor). Of course the converter is on the drivers side! I was looking to my right from the passenger side. what can I say. Anyway I see how u solved the problem, going over and under.
I should find a 78 or earlier, huh. Just to run straight? Thanks for the help. Good place for the balance pipe too. |
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