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

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.

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

thats right.

As Far As I Know=AFAIK

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?

I have Energy Suspension's trans mounts installed on my K10. p/n 3.1106G. I also have the xfer torque mount poly bushings. p/n 3.1107G. Motor mounts are separate, though my 71 K10's are not available thru Energy Suspension:

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.:D

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.