SB 350/auto: Does anything hold the back of the motor up? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

MedicineMan · 08-11-2010, 01:32 AM

I'm ready to drop my new SB 350 into my bodyless frame. Without support from the auto transmision and its crossmember, I can see that the rear of the motor will be unsupported and will droop and break the motor mounts. Have I missed something?

The truck is a 68 2wd originaly with a 250/3spd manual. I've got a new TH350, auto crossmember from early classic, and small block motor towers. I was going to drop the motor in to the frame today without the trans mounted until I realized all this.

thanks.

cokeb · 08-11-2010, 01:40 AM

You'll need to support the engine some how (jack stand with a block of wood under the oil pan) until you get the trans. and crossmember installed.

Craig

eagleuh1 · 08-11-2010, 07:17 AM

I ran a 2x4 across the frame and drilled 2 holes and bolted through the engine/tranny mounting holes while I was checking out something on my LS install. Worked for me.

68gmsee · 08-11-2010, 09:14 AM

Lower the engine in the compartment and hold it where you want it. Then use a floor jack hold the rear up.

I use a small wood block with a shop cloth on top to hold mine. This way I can lower or raise the engine from the rear as needed when installing the transmission.

vasquezmrysvll · 08-11-2010, 12:26 PM

my th350 is currently pulled back from the engine, nothing supporting the rear of the engine. well.... my exhaust is still hooked up, no problems yet? YET!?

**slomotion** · 08-11-2010, 04:29 PM

^^^^

I'd be inclined to support the engine PDQ. If something sags just a little you may be shopping for a new dizzy.

Longhorn Man · 08-11-2010, 05:19 PM

those manifolds may be junk now.

MedicineMan · 08-11-2010, 11:05 PM

Thanks guys! I got the Motor in, and the manual trans crossmember swaped out for the Automatic trans crossmember, not bolted in yet. Proped the motor up on a jackstand like you all said. Tranny can go in tomorrow then I'll get the body parts to the painter!

vasquezmrysvll · 08-12-2010, 04:14 AM

Quote:

Originally Posted by Longhorn Man

those manifolds may be junk now.

their actually cheap headers, just fired it back up with no problems?

vasquezmrysvll · 08-12-2010, 04:16 AM

Quote:

Originally Posted by slomotion

^^^^

I'd be inclined to support the engine PDQ. If something sags just a little you may be shopping for a new dizzy.

after divorcing the trans the engine didn't move a bit (noticeably)

08-11-2010, 01:32 AM	#1
MedicineMan Registered User Join Date: May 2008 Location: Mustang, Oklahoma Posts: 29	SB 350/auto: Does anything hold the back of the motor up? I'm ready to drop my new SB 350 into my bodyless frame. Without support from the auto transmision and its crossmember, I can see that the rear of the motor will be unsupported and will droop and break the motor mounts. Have I missed something? The truck is a 68 2wd originaly with a 250/3spd manual. I've got a new TH350, auto crossmember from early classic, and small block motor towers. I was going to drop the motor in to the frame today without the trans mounted until I realized all this. thanks. Last edited by MedicineMan; 08-11-2010 at 01:33 AM. Reason: misspell

08-11-2010, 01:40 AM	#2
cokeb Registered User Join Date: Jul 2009 Location: boise, Id. Posts: 72	Re: SB 350/auto: Does anything hold the back of the motor up? You'll need to support the engine some how (jack stand with a block of wood under the oil pan) until you get the trans. and crossmember installed. Craig

08-11-2010, 07:17 AM	#3
eagleuh1 Registered User Join Date: Jul 2009 Location: Russellville, Arkansas Posts: 1,699	Re: SB 350/auto: Does anything hold the back of the motor up? I ran a 2x4 across the frame and drilled 2 holes and bolted through the engine/tranny mounting holes while I was checking out something on my LS install. Worked for me.

08-11-2010, 09:14 AM	#4
68gmsee Active Member Join Date: Jul 2007 Location: Centrally located between Houston, Austin and Waco. BCS area. Posts: 7,947	Re: SB 350/auto: Does anything hold the back of the motor up? Lower the engine in the compartment and hold it where you want it. Then use a floor jack hold the rear up. I use a small wood block with a shop cloth on top to hold mine. This way I can lower or raise the engine from the rear as needed when installing the transmission.

08-11-2010, 12:26 PM	#5
vasquezmrysvll "the other guy" Join Date: Oct 2008 Location: Olivehurst California 95961 Posts: 901	Re: SB 350/auto: Does anything hold the back of the motor up? my th350 is currently pulled back from the engine, nothing supporting the rear of the engine. well.... my exhaust is still hooked up, no problems yet? YET!? __________________ God Said,"Building A 10 Second Import Is Like Coming Out Of The Closet, In The End Ur Still....."EXPLETIVE"

08-11-2010, 04:29 PM	#6
slomotion Old Duffer Join Date: Mar 2003 Location: Maine Posts: 1,821	Re: SB 350/auto: Does anything hold the back of the motor up? ^^^^ I'd be inclined to support the engine PDQ. If something sags just a little you may be shopping for a new dizzy. __________________ '68 Short C20 Flatbed Dually w/ 292 4bbl, Langdon cast headers, and WC T5 trans. '81 G10 Shorty Van "Good judgement comes from experience, and a lot of that comes from bad judgement." Will Rogers "Under promise, then over achieve."

08-11-2010, 05:19 PM	#7
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: SB 350/auto: Does anything hold the back of the motor up? those manifolds may be junk now.

08-11-2010, 11:05 PM	#8
MedicineMan Registered User Join Date: May 2008 Location: Mustang, Oklahoma Posts: 29	Re: SB 350/auto: Does anything hold the back of the motor up? Thanks guys! I got the Motor in, and the manual trans crossmember swaped out for the Automatic trans crossmember, not bolted in yet. Proped the motor up on a jackstand like you all said. Tranny can go in tomorrow then I'll get the body parts to the painter!



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