Is this a GM part? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

72LB · 01-05-2019, 05:45 PM

Pulled my transmission out today and this was in between the tailshaft and the mount. Gm part?

**AussieinNC** · 01-05-2019, 06:29 PM

Unless it has a GM part number on it, it looks more like aftermarket height adjustment shim to align the driveshaft angle...

**FirstOwner69** · 01-05-2019, 07:45 PM

If I recall correctly, my '69 3/4 ton with a TH400 (350 engine) has one. The engine and transmission had never been removed until I did it 7 years ago. Here's a picture that appears to verify this.

72LB · 01-05-2019, 08:36 PM

Quote:

Originally Posted by FirstOwner69

If I recall correctly, my '69 3/4 ton with a TH400 (350 engine) has one. The engine and transmission had never been removed until I did it 7 years ago. Here's a picture that appears to verify this.

Hm mine is a TH400 also.

**kwmech** · 01-05-2019, 08:46 PM

Yup, factory spacer. Seen lots of trucks with them

100%Chevy · 01-05-2019, 08:59 PM

My 68,with the t-400 has it also.
Mike.

**chewychevy67** · 01-05-2019, 10:00 PM

Just curious any reason some have and some don't? 3/4 ton thing? Engine angle thing? I had 1 3/4 ton have it as well.

*randy500* · 01-05-2019, 10:26 PM

They all have it, I think th350 has 2 spacers.

BROWN 70 · 01-05-2019, 10:53 PM

hi, my 70 gmc has one. 350\350th

**chewychevy67** · 01-06-2019, 01:09 AM

I don't think they all have a spacer. My short box 327 th400 didn't have one. I'm pretty sure the amount of grease buildup that it was never removed before but it could have

**FirstOwner69** · 01-06-2019, 01:31 AM

Maybe long beds have them and short beds don't.

painterljp · 01-06-2019, 10:57 AM

Better put it back. It worked fine with them in there. Lol. Yes our gmc has 2 of them. We put them back in there.

toolboxchev · 01-06-2019, 02:15 PM

Yup, 70 3/4 ton, 350/thd350 has one.

72LB · 01-06-2019, 05:17 PM

Quote:

Originally Posted by FirstOwner69

Maybe long beds have them and short beds don't.

Mine is a short bed.

Quote:

Originally Posted by painterljp

Better put it back. It worked fine with them in there. Lol. Yes our gmc has 2 of them. We put them back in there.

It's going back in when the trans is finished, already cleaned it up and painted.

Keith Seymore · 01-07-2019, 09:54 AM

Quote:

Originally Posted by chewychevy67

Just curious any reason some have and some don't? 3/4 ton thing? Engine angle thing? I had 1 3/4 ton have it as well.

Yes. It will vary based on engine, trans, wheelbase, suspension and driveline configuration (one piece drive shaft vs two piece drive shaft).

K

01-05-2019, 05:45 PM	#1
72LB Registered User Join Date: May 2017 Location: Inman/Boiling Springs, SC Posts: 420	Is this a GM part? Pulled my transmission out today and this was in between the tailshaft and the mount. Gm part? Attached Images __________________ 1985 C10 shortbed, current project. Member of the Upstate SC GM Truck Club.

01-05-2019, 06:29 PM	#2
AussieinNC Moderator Join Date: Jun 2017 Location: Cherryville, NC Posts: 2,210	Re: Is this a GM part? Unless it has a GM part number on it, it looks more like aftermarket height adjustment shim to align the driveshaft angle... __________________ Family and country before all others... 2006 Chevy Silverado (Daily Driver) 2012 Chevy Equinox

01-05-2019, 07:45 PM	#3
FirstOwner69 Senior Member Join Date: May 2010 Location: Wisconsin & Arizona Posts: 4,854	Re: Is this a GM part? If I recall correctly, my '69 3/4 ton with a TH400 (350 engine) has one. The engine and transmission had never been removed until I did it 7 years ago. Here's a picture that appears to verify this. Attached Images

01-05-2019, 08:46 PM	#5
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,718	Re: Is this a GM part? Yup, factory spacer. Seen lots of trucks with them

01-05-2019, 08:59 PM	#6
100%Chevy Registered User Join Date: Jun 2008 Location: Moss Point,Ms. Posts: 1,439	Re: Is this a GM part? My 68,with the t-400 has it also. Mike.

01-05-2019, 10:00 PM	#7
chewychevy67 Senior Member Join Date: Jan 2010 Location: Here Posts: 5,592	Re: Is this a GM part? Just curious any reason some have and some don't? 3/4 ton thing? Engine angle thing? I had 1 3/4 ton have it as well.

01-05-2019, 10:26 PM	#8
randy500 Account Suspended Join Date: Jul 2016 Location: Tacoma, WA Posts: 6,873	Re: Is this a GM part? They all have it, I think th350 has 2 spacers.

01-05-2019, 10:53 PM	#9
BROWN 70 Registered User Join Date: Aug 2010 Location: central oregon Posts: 166	Re: Is this a GM part? hi, my 70 gmc has one. 350\350th

01-06-2019, 01:09 AM	#10
chewychevy67 Senior Member Join Date: Jan 2010 Location: Here Posts: 5,592	Re: Is this a GM part? I don't think they all have a spacer. My short box 327 th400 didn't have one. I'm pretty sure the amount of grease buildup that it was never removed before but it could have

01-06-2019, 01:31 AM	#11
FirstOwner69 Senior Member Join Date: May 2010 Location: Wisconsin & Arizona Posts: 4,854	Re: Is this a GM part? Maybe long beds have them and short beds don't.

01-06-2019, 10:57 AM	#12
painterljp Registered User Join Date: Nov 2014 Location: Albuquerque NM Posts: 901	Re: Is this a GM part? Better put it back. It worked fine with them in there. Lol. Yes our gmc has 2 of them. We put them back in there.

01-06-2019, 02:15 PM	#13
toolboxchev Registered User Join Date: Jul 2015 Location: 2nd left past the stump on a dirt road. Posts: 2,629	Re: Is this a GM part? Yup, 70 3/4 ton, 350/thd350 has one.



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