BB Mounts... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

4x4 70 Chevy guy · 05-12-2006, 01:59 AM

I've been looking around and the local parts places dont even list a motor mount for my truck. And I found 2 different kinds on websites one for sb and bb 67-72 and one for 396. I dont know much about these trucks yet and dont know what I need. Also the crossmember seems to have found its way free from the frame partially

Does anyone know where I might find a replacement? cant find one so far. I'll have to take pic tomorrow if needed. All help appreciated.

72armyswbtruck · 05-12-2006, 03:25 AM

OK, they made two different type of Big Block motor mounts 67-71 and 72 only, the 72 only had a problem with the rubber, alot of guys use the 73 and up BB motor mounts because they are still available new from GM, check the Frequently asked questions and you should find a thread on the motor mounts that you need. If not check thru my previous post and you will see the set that I sold. Good luck and welcome to the board

**too much stuff** · 05-12-2006, 09:53 AM

If this is for your 4x4, you wont find any mounts. GM never made a big block 4x4 until after 72...

4x4 70 Chevy guy · 05-12-2006, 12:29 PM

Thanks, is the crossmember specific for a BB? Will a 73 and up cross and motor mounts work on my truck?

Livrat · 05-12-2006, 12:37 PM

You can use the 73 4X4 and up crossmember and mounts with a little modification..
If yours is a 4X4 and has a Big block in it just use the Small block mounts they work fine.. I have two 4X4's using the small block mounts..

4x4 70 Chevy guy · 05-13-2006, 12:26 AM

Here are some pictures of the mounts and crossmember, sorry for the quality, I dont have my camera right now so I have to use my phone. I dont know if this is even the right crossmember...??

As you can see the crossmember has broken away from the frame on the drivers side and the manifold is sitting on the frame.

Livrat · 05-13-2006, 12:46 AM

Wow!!.. What you have there is the lower half of a stock 4X4 crossmember and 67 - 71 2WD Big block towers and rubber cushions that appear to be welded to the top of the stock 4X4 crossmember. the stock crossmember should be bolted to the frame on both the top and bottom.. here is a picture of a stock one
Personally I would find a complete stock 67 - 72 4X4 crossmember and use the small block cushions.. or go ahead and find and put in the 73 assembly.. it is a much beefier setup.. and more likely to find in a wrecking yard..

4x4 70 Chevy guy · 05-13-2006, 12:53 AM

I figured somethin screwy was up with that. Well I guess my plan is to re-bolt the bottom parts down since there were just welded and the welds have obviously broken, and get BB mounts for a 2wd?

4x4Poet · 05-13-2006, 03:28 AM

The 73-80 engine crossmember is superior, as stated. Installing one entails drilling a couple holes and maybe a little trimming. Depends also on where on the frame the engine is placed. The 73-80 xmember also has a foward sweep to the crossmember that enables the use of more oil pan types.

Livrat · 05-13-2006, 09:05 AM

That is one way to go.. The 2Wd BB mounts are expensive and not always easy to locate..
Personally I would toss the entire crossmember you have because to me it looks "mickey moused" and the other welds may not be strong..
At least find a stock one in good shape, Or better yet dig up a 73 - 80 one.. either way you will have to drill some holes as it appears your frame does not have any where needed hence the welding..

Bob Moore · 05-13-2006, 09:35 PM

Listen very carefully to LIVRAT. The man knows his stuff!!!

stllookn · 05-14-2006, 02:01 AM

Let me second that on LIVRAT...I have seen his portfolio...it is very impressive!!!!! Dude knows his stuff!

05-12-2006, 01:59 AM	#1
4x4 70 Chevy guy Registered User Join Date: May 2006 Location: Weatherford, Tx Posts: 23	BB Mounts... I've been looking around and the local parts places dont even list a motor mount for my truck. And I found 2 different kinds on websites one for sb and bb 67-72 and one for 396. I dont know much about these trucks yet and dont know what I need. Also the crossmember seems to have found its way free from the frame partially Does anyone know where I might find a replacement? cant find one so far. I'll have to take pic tomorrow if needed. All help appreciated. __________________ 1970 3/4 ton 4x4 Lwb - 396ci. w/disc brakes up front (work in progress)

05-12-2006, 03:25 AM	#2
72armyswbtruck Registered User Join Date: Feb 2004 Location: Idaho Posts: 4,033	Re: BB Mounts... OK, they made two different type of Big Block motor mounts 67-71 and 72 only, the 72 only had a problem with the rubber, alot of guys use the 73 and up BB motor mounts because they are still available new from GM, check the Frequently asked questions and you should find a thread on the motor mounts that you need. If not check thru my previous post and you will see the set that I sold. Good luck and welcome to the board __________________ "Remember, They can Kill You, but they can't eat You, That's against the law!!!!!!!!!"

05-12-2006, 09:53 AM	#3
too much stuff Roadtrip! Join Date: Feb 2003 Location: Grand Rapids MN Posts: 13,786	Re: BB Mounts... If this is for your 4x4, you wont find any mounts. GM never made a big block 4x4 until after 72... __________________ 67 gmc custom lwb dakota truck. Sold...And bought back 69 swb 4x4 project (in progress) 70 c-10 lwb texas truck 70 4x4/BB/bkts/posi/tach(retired) 70 swb (wifes) 70 jimmy camper 71 K-5 factory 2wd 71 cheyenne 4x4/tach/posi/ plow rig 71 Cheyenne20 BB, buckets, tach, tilt, 4 speed 72 jimmy CST wyoming rig 72 jimmy Colorado rig 72 lifted texas 4x4 3/4 ton burb 65 fury conv. 383/auto 65 chrysler 300 "L" 413 auto

05-12-2006, 12:29 PM	#4
4x4 70 Chevy guy Registered User Join Date: May 2006 Location: Weatherford, Tx Posts: 23	Re: BB Mounts... Thanks, is the crossmember specific for a BB? Will a 73 and up cross and motor mounts work on my truck? __________________ 1970 3/4 ton 4x4 Lwb - 396ci. w/disc brakes up front (work in progress)

05-12-2006, 12:37 PM	#5
Livrat Member #1049 Join Date: Jun 2000 Location: Troy Montana Posts: 3,940	Re: BB Mounts... You can use the 73 4X4 and up crossmember and mounts with a little modification.. If yours is a 4X4 and has a Big block in it just use the Small block mounts they work fine.. I have two 4X4's using the small block mounts..

05-13-2006, 12:26 AM	#6
4x4 70 Chevy guy Registered User Join Date: May 2006 Location: Weatherford, Tx Posts: 23	Re: BB Mounts... Here are some pictures of the mounts and crossmember, sorry for the quality, I dont have my camera right now so I have to use my phone. I dont know if this is even the right crossmember...?? As you can see the crossmember has broken away from the frame on the drivers side and the manifold is sitting on the frame. Attached Images __________________ 1970 3/4 ton 4x4 Lwb - 396ci. w/disc brakes up front (work in progress) Last edited by 4x4 70 Chevy guy; 05-13-2006 at 12:27 AM.

05-13-2006, 12:46 AM	#7
Livrat Member #1049 Join Date: Jun 2000 Location: Troy Montana Posts: 3,940	Re: BB Mounts... Wow!!.. What you have there is the lower half of a stock 4X4 crossmember and 67 - 71 2WD Big block towers and rubber cushions that appear to be welded to the top of the stock 4X4 crossmember. the stock crossmember should be bolted to the frame on both the top and bottom.. here is a picture of a stock one Personally I would find a complete stock 67 - 72 4X4 crossmember and use the small block cushions.. or go ahead and find and put in the 73 assembly.. it is a much beefier setup.. and more likely to find in a wrecking yard.. Attached Images Last edited by Livrat; 05-13-2006 at 12:55 AM.

05-13-2006, 12:53 AM	#8
4x4 70 Chevy guy Registered User Join Date: May 2006 Location: Weatherford, Tx Posts: 23	Re: BB Mounts... I figured somethin screwy was up with that. Well I guess my plan is to re-bolt the bottom parts down since there were just welded and the welds have obviously broken, and get BB mounts for a 2wd? __________________ 1970 3/4 ton 4x4 Lwb - 396ci. w/disc brakes up front (work in progress)

05-13-2006, 03:28 AM	#9
4x4Poet Registered User Join Date: Nov 2004 Location: "Under Montana skies." Posts: 1,836	Re: BB Mounts... The 73-80 engine crossmember is superior, as stated. Installing one entails drilling a couple holes and maybe a little trimming. Depends also on where on the frame the engine is placed. The 73-80 xmember also has a foward sweep to the crossmember that enables the use of more oil pan types. __________________ '71 GMC K20 Suburban, '71 GMC K10 Suburban, '72 Chevy C10 CST Suburban, '72 Chevy K20 clunker pickup.

05-13-2006, 09:05 AM	#10
Livrat Member #1049 Join Date: Jun 2000 Location: Troy Montana Posts: 3,940	Re: BB Mounts... That is one way to go.. The 2Wd BB mounts are expensive and not always easy to locate.. Personally I would toss the entire crossmember you have because to me it looks "mickey moused" and the other welds may not be strong.. At least find a stock one in good shape, Or better yet dig up a 73 - 80 one.. either way you will have to drill some holes as it appears your frame does not have any where needed hence the welding..

05-13-2006, 09:35 PM	#11
Bob Moore Registered User Join Date: Feb 2004 Location: Tacoma WA Posts: 1,365	Re: BB Mounts... Listen very carefully to LIVRAT. The man knows his stuff!!! __________________ 67 C-20 LWB, tilt, speed alert, vac, 454, T400 67 C-10 SWB, factory air with more to follow

05-14-2006, 02:01 AM	#12
stllookn Saving 1 truck at a time! Join Date: Aug 2001 Location: Kent, WA Posts: 6,465	Re: BB Mounts... Let me second that on LIVRAT...I have seen his portfolio...it is very impressive!!!!! Dude knows his stuff! __________________ '68 C20 Longhorn 50th Anniversary 400/TH400 '68 C20 Longhorn 50th Anniversary 468/TH400w/buckets '72 C20 Halfhorn (Longhorn w/o cab and front clip) '69 Flxible Cruiser (look up ugly in the dictionary)



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