Trans crossmember help.

CrammerGram69

Master Mechanic
Nov 15, 2019
334
43
SW, Michigan
Morning everyone. Where can I get replacements of these for my crossmember. They smush in-between it and the frame where it bolts the car is a 1979. Originally a th200 now has a th350 in the car with the Buick V6.

I could also use photos of how it went and bolted up underneath if anyone has some. The spare crossmember i was going to use... the mounting holes on the sides are different than mine. (Smaller) probably due to it being from a SBC/350 car and a 78.


Any help appreciated. Trans is in the car but need to finish this up.
 

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565bbchevy

Geezer
Aug 8, 2011
9,125
113
Michigan
I usually make replacements out of steel of equal thickness just to keep the trans at the factory angle, you will still have a rubber/poly trans mount to absorb vibrations and allow some movement.
 
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CrammerGram69

Master Mechanic
Thread starter
Nov 15, 2019
334
43
SW, Michigan
I see. I'll try to read the numbers on mine I'd much rather stick with the rubber. I'll get photos of my Crossmembers soon
 

69hurstolds

Geezer
Supporting Member
Jan 2, 2006
6,632
113
Need 2 of these (p/n 375726):


You sure you want NOS at those prices?

And 4 of these:


457908 insulator (white) was replaced with 459092 (blue) in 1982.
 
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69hurstolds

Geezer
Supporting Member
Jan 2, 2006
6,632
113
Insulator sits on frame, then transmission support, insulator #2, then retainer (the part with the pegs) goes through there. Then a bolt goes up from underneath the frame bolt holes and a nut retains the top of the bolt. That's what it shows in the parts information.

VIN 9 Olds I don't believe ever had these, so I'm not familiar with them.
 
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CrammerGram69

Master Mechanic
Thread starter
Nov 15, 2019
334
43
SW, Michigan
Insulator sits on frame, then transmission support, insulator #2, then retainer (the part with the pegs) goes through there. Then a bolt goes up from underneath the frame bolt holes and a nut retains the top of the bolt. That's what it shows in the parts information.

VIN 9 Olds I don't believe ever had these, so I'm not familiar with them.
Hmm. I didn't remove these my father did and that was 6 Yrs ago at least. So I'm not familiar with out photos that's why i asked on my post lol. Do you know what size bolts/nuts? All my sh*t is everywhere. Also was this combo only a v6 thing? I have never seen it on V8 cars. Pre-81-82 thing?
 

69hurstolds

Geezer
Supporting Member
Jan 2, 2006
6,632
113
Bolts- M10 x 1.5 x 30mm

Nuts- M10

The application varied. Some V8 cars got them, like big cars, and a lot of V6 cars got them. Even the earlier V6 with 4-speed MT Malibus.
 
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CrammerGram69

Master Mechanic
Thread starter
Nov 15, 2019
334
43
SW, Michigan
Bolts- M10 x 1.5 x 30mm

Nuts- M10

The application varied. Some V8 cars got them, like big cars, and a lot of V6 cars got them. Even the earlier V6 with 4-speed MT Malibus.
Interesting, seems pretty hard to comeby nowadays so many ppl swap their v6 cars. My father had a '79 malibu 229 chevy v6 and it was a manual car, floor 3spd?

Thx for the specs.
 

oldsofb

Royal Smart Person
Supporting Member
Dec 7, 2007
1,217
113
Maryland
VIN 9 Olds I don't believe ever had these, so I'm not familiar with them.
My 87 442 was just straight bolted to the frame. No insulator to be found.

Hutch
 
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Drkuhar

Master Mechanic
Sep 27, 2018
428
93
Girard, IL
My original 6cyl crossmember had them. I thought it was more to hold the nutsert bracket so they could be zipped on with an impact and wouldn't need a wrench on the assemby line
 
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