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02-28-2005, 12:15 AM
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#1 |
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Account Suspended
 
Join Date: Jun 2003
Location: PA
Posts: 1,411
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4x4 CROSSMEMBER QUESTION??
On a 71/72 K20, are AUTOMATIC and MANUAL transmission crossmembers the same part. Can they be interchanged with just different mounts??
Thanks for your knowledge, 72longbed |
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02-28-2005, 02:30 AM
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#2 |
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Registered User
Join Date: Nov 2004
Location: "Under Montana skies."
Posts: 1,836
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What different mounts? The mounts go to the adapter between whichever tranny it came with. AFAIK, oem '71/'72 adapters all used the two piece mounts. My '71 K10 w/SM465 and my '71 K20 w/TH350 use the same transmission xmember mounts. Both have NP205s, of course. BTW, Energy Suspension makes the two piece mounts in poly.
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'71 GMC K20 Suburban, '71 GMC K10 Suburban, '72 Chevy C10 CST Suburban, '72 Chevy K20 clunker pickup. |
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02-28-2005, 10:32 AM
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#3 |
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Account Suspended
Join Date: Jun 2003
Location: PA
Posts: 1,411
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4x4poet,
what is a AFAIK?? So the transmission mount is eliminated, and the crossmember bolts only to the transfer case adapter?? Let me know if this is correct. Thanks, 72longbed |
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02-28-2005, 01:12 PM
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#4 |
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Registered User
Join Date: Apr 2000
Location: Chester County PA, USA
Posts: 1,228
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thats right.
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72 k/10 short wideside 72 k/5 Blazer 72 K/5 Blazer - obstacle course racer 72 custom/10 8' bed 70 K/5 Blazer 67 C-30 GMC Flat bed 86 GMC K2500 Plow Truck 85 GMC K3500 84 M1008 85 M1008 77 G30 Motor Home 72 Sears 12hp Tractor Glenmoore, Pennsylvania |
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02-28-2005, 02:34 PM
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#5 |
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user # 2756
Join Date: Jun 2001
Location: Chesapeake, Virginia
Posts: 4,612
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As Far As I Know=AFAIK
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1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm 
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03-11-2005, 01:43 AM
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#6 | |
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Registered User
Join Date: Nov 2004
Posts: 9
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Quote:
I was going to ask about those poly mounts and thought I would jump in here. Any pro's or cons with these? Do I have to use there motor mounts to? |
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03-11-2005, 07:02 AM
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#7 | |
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Registered User
Join Date: Nov 2004
Location: "Under Montana skies."
Posts: 1,836
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Quote:
Cons: Cost. About $60 for the trans mount pair. About $20 for the torque bushings. Pros: Impervious to oil, grease. Won't rot as rubber does. Retains shape. Made of soft poly to allow some flex and not transmit vibration. Comes with gold, cad-plated plates. Looks great if you crawl under the truck. 
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'71 GMC K20 Suburban, '71 GMC K10 Suburban, '72 Chevy C10 CST Suburban, '72 Chevy K20 clunker pickup. |
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03-14-2005, 02:13 AM
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#8 |
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Senior Member
Join Date: Dec 1999
Location: Southern California
Posts: 2,829
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I saw the poly engine mounts available at Brothers. They are listed as big block mounts. They are the same as the 4x4. I used the same crossmember on my last 72 that I converted from manual to auto. Had a donor truck.
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Richard 1972 K10 Custom Deluxe SWB Fleetside My build https://67-72chevytrucks.com/vboard/...d.php?t=800746 |
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