#1  
Old 04-14-2023, 11:07 PM
TA63 TA63 is offline
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Default dual exhaust crossmember for 77

Does anyone offer a transmission crossmember that will work with a dual exhaust on a 77 grand prix with TH400?

  #2  
Old 04-15-2023, 10:12 AM
brewcitybirs brewcitybirs is offline
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Any 1973-74 gm a-body except El Camino should work. If you search 1973-1977 GM A-body cross member for what ever reason it doesn’t list Grand Prix. I have a 75 GP and I used a crossmember from a 73 Lemans.

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1975 Grand Prix
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Old 04-15-2023, 02:55 PM
brewcitybirs brewcitybirs is offline
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https://www.crossmembers.com/product...ember-hardtops This one would work.

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  #4  
Old 04-18-2023, 12:42 AM
TA63 TA63 is offline
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Thank you!

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Old 04-18-2023, 12:48 PM
GNvsTA GNvsTA is offline
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If memory serves, its been awhile, I used a LeMans crossmember on my 77 GP also.

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Old 04-27-2023, 10:25 AM
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camerjeff camerjeff is offline
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It might work, but if I remember correctly the 73-77 G bodies used a tubular cross member, and the 73-77 A bodies uses a flatter stamped cross member. I may still have the cross member I pulled out of a 73 GP a few years ago in storage. I will try and remember to look for it this weekend.

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60 Jaguar Mark 2, 3.8L Automatic
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77 Astre Formula, 215 Buick V-8 T-5
73 Lemans Safari, 400 4bbl 4-speed
71 Catalina Enforcer, 455 4bbl
06 Mallet Solstice #024 LS2, Now with a Tremec 6060 6-speed!
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Old 04-27-2023, 11:15 AM
brewcitybirs brewcitybirs is offline
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From my understanding the difference was the transmission. The flat stamped piece was for Turbo 350's the tubular was Turbo 400. They both work with either trans. My crossmember is from a 73 LeMans that had a Turbo 350, my GP has a turbo 400 I used the stamped style. Basically all the 2 door GM Colonnade bodies are the same from the firewall back. Did the same thing on my step bro's 74 Cutlass, removed a 350 Turbo 350 installed a 455 Turbo 400 used the stamped Turbo 350 crossmember just had to move the crossmember back to the rear holes in the frame.

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  #8  
Old 04-28-2023, 11:08 PM
TA63 TA63 is offline
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Quote:
Originally Posted by camerjeff View Post
It might work, but if I remember correctly the 73-77 G bodies used a tubular cross member, and the 73-77 A bodies uses a flatter stamped cross member. I may still have the cross member I pulled out of a 73 GP a few years ago in storage. I will try and remember to look for it this weekend.
Thanks! I'd be interested in it if you wanted to get rid of it.

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Old 04-29-2023, 04:49 AM
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If I still have it I would be willing to sell it, where are you located? Shipping will probably be expensive due to its size.

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60 Jaguar Mark 2, 3.8L Automatic
67 Sprint Firebird 230 OHC-6 4-Speed A/C
78 Catlina Safari, Pontiac 400 powered
77 Astre Formula, 215 Buick V-8 T-5
73 Lemans Safari, 400 4bbl 4-speed
71 Catalina Enforcer, 455 4bbl
06 Mallet Solstice #024 LS2, Now with a Tremec 6060 6-speed!
2012 F-150 Echo Boost (My local Ford Dealer SUX!!!)
2020 Dodge Charger Scat pack (recovered)
  #10  
Old 04-29-2023, 08:01 PM
redonred81 redonred81 is offline
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Quote:
Originally Posted by camerjeff View Post
If I still have it I would be willing to sell it, where are you located? Shipping will probably be expensive due to its size.
If still available im interested in it.thanks

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Old 04-29-2023, 11:25 PM
TA63 TA63 is offline
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Quote:
Originally Posted by camerjeff View Post
If I still have it I would be willing to sell it, where are you located? Shipping will probably be expensive due to its size.
I'm in South Dakota, and am used to being beat up on shipping haha. It's gotten especially bad the last few years it seems. Gotta pay to play!

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