350 to 2004r swap crossmember
February 17th, 2019, 02:39 AM
#1
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350 to 2004r swap crossmember
I have a 1983 Oldsmobile Delta 88 I am currently in the process of swapping out my toasted 2004r for a 350 transmission I had laying around but I can’t seem to get the crossmember to line up to the mount on the 350 transmission. Any suggestions would be greatly Appreciated. Thanks in advance guys!!
February 17th, 2019, 05:40 AM
#2
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Join Date: Mar 2007
Location: Northern VA
Posts: 47,259
I have a 1983 Oldsmobile Delta 88 I am currently in the process of swapping out my toasted 2004r for a 350 transmission I had laying around but I can’t seem to get the crossmember to line up to the mount on the 350 transmission. Any suggestions would be greatly Appreciated. Thanks in advance guys!!
February 17th, 2019, 08:23 AM
#3
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Unlike the older cars, the 1977-1990 B/C-body car and the 1978-1988 A/G-body cars do use different crossmembers for the shorter TH200/TH350 transmissions. You'll need one of those. Since the crossmember does not go straight across the frame rails, you cannot simply slide it forward the way you could on the older cars.[/QUOTE]
Would it be possible to weld a piece of metal to the the crossmember mounting pad to extend the mounting pad to reach the 350 trans mount?
Would it be possible to weld a piece of metal to the the crossmember mounting pad to extend the mounting pad to reach the 350 trans mount?
February 17th, 2019, 08:41 AM
#4
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Location: Northern VA
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If it were that easy, GM wouldn't have spent the money on tooling up two different crossmembers. The crossmember is angled and also is contoured to clear the catalytic converter. The mount for the trans is in line with the two attachment points of the crossmember to the frame. This way the crossmember is only loaded in bending, not in torsion. If you extend the mount (and we're talking about four or five inches here), you are putting a twisting load into the crossmember and thus into the frame at the mounting points.
February 17th, 2019, 11:59 AM
#5
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If it were that easy, GM wouldn't have spent the money on tooling up two different crossmembers. The crossmember is angled and also is contoured to clear the catalytic converter. The mount for the trans is in line with the two attachment points of the crossmember to the frame. This way the crossmember is only loaded in bending, not in torsion. If you extend the mount (and we're talking about four or five inches here), you are putting a twisting load into the crossmember and thus into the frame at the mounting points.
March 4th, 2019, 05:27 AM
#6
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Joe's note is 100% on the money, I had to get a different Cross member when I ditched my M200 for a 200R4 in my 79 Calais. I kept the original cross member in case a future owner wants to switch it back to a 200 or 350. That ain't gonna happen under my watch. Next step is a 350 R code Olds motor if that ever even happens.
March 6th, 2019, 09:00 AM
#7
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Joe's note is 100% on the money, I had to get a different Cross member when I ditched my M200 for a 200R4 in my 79 Calais. I kept the original cross member in case a future owner wants to switch it back to a 200 or 350. That ain't gonna happen under my watch. Next step is a 350 R code Olds motor if that ever even happens.
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