Decode part# please 3817778 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

PT'S 70 CST · 03-12-2011, 08:36 PM

I know these are 373 gears and are suppose to be NOS. They are date coded 6-71 and are marked 11:41 which is 3.72727727 if divided (3:73) I just need to know if these are truck gears. My buddy purchased them at a swap meet and they were sold to him as car gears and he said they are not for a car he thinks they are truck gears. I will try and post pics of them in the morning. I am pulling 4 12 hr. nights this weekend.

(#3817778)

Thanks for your help PT

PT'S 70 CST · 03-12-2011, 11:44 PM

ttt

**68 Stepside** · 03-13-2011, 08:09 AM

http://67-72chevytrucks.com/vboard/s...ad.php?t=73495

Pulled that thread up from the dead....

Here's another:

http://www.hotrodders.com/forum/gm-r...ion-89342.html

My guess is that they're truck gears.

**GMCPaul** · 03-13-2011, 08:40 AM

Yes they are truck gears and make a 3:73 ratio, the GM master parts catalog shows 65-72 1/2 ton CK&P models and 70-72 Blazer used GM part # 3961415 which used part# 3817778 ( Ring Gear ) & part# 3884935 ( Pinion Gear )to make a Ring & Pinion set to make a 3:73 ratio gearing for the 65-72 1/2 ton truck.
GMCPaul

PT'S 70 CST · 03-13-2011, 11:05 AM

Here are some pics. I do not know if these are new or not. My friend bought these at a swap meet and wants to sell them but I just cannot tell. If they are not new they are in exc. cond. I cannot find any wear marks on them. I will post some pics of them and the pinion gear does read 3884935 11:41 6-71 GM. The ring gear reads 3817778 11:41 GM 6-71 1. Also on the base of the pinion gear it is stamped 1-14. You guys be the judge and I know this needs to be moved to the WIW section because he wants to sell them and I need to get an idea of what they are worth.

Thanks guys PT

PT'S 70 CST · 03-13-2011, 11:06 AM

1 More

PT'S 70 CST · 03-13-2011, 05:08 PM

Any ideas guys what these are worth in this cond..

PT

PT'S 70 CST · 03-13-2011, 07:25 PM

68 Stepside and GMCPaul thanks for your help.

PT

03-12-2011, 08:36 PM	#1
PT'S 70 CST "GO DAWGS" Join Date: Oct 2003 Location: Batesburg, SC. 29006 Posts: 5,410	Decode part# please 3817778 ring and pinion gears(pics added) I know these are 373 gears and are suppose to be NOS. They are date coded 6-71 and are marked 11:41 which is 3.72727727 if divided (3:73) I just need to know if these are truck gears. My buddy purchased them at a swap meet and they were sold to him as car gears and he said they are not for a car he thinks they are truck gears. I will try and post pics of them in the morning. I am pulling 4 12 hr. nights this weekend. (#3817778) Thanks for your help PT __________________ 70 CST SWB 70 NOVA 93 Indy 500 Pace Truck (SOLD) 94 SILVERADO SWB 5/7 drop 2000 Silverado swb 2005 Nissan Altima 3.5 (Surprisingly very fast) 2004 GMC Yukon XL Denali BATESBURG, SC. 29006 29006 Some of my restorations http://www.snapfish.com/snapfish/thu...NAME=snapfish/ Restored Tach tins 8 cyl - 6 cyl http://67-72chevytrucks.com/vboard/s...d.php?t=518185 Contact info(Not my paypal address) DAWGSFAN227@YAHOO.COM God Bless Our Troops Last edited by PT'S 70 CST; 03-13-2011 at 11:58 AM. Reason: information

03-12-2011, 11:44 PM	#2
PT'S 70 CST "GO DAWGS" Join Date: Oct 2003 Location: Batesburg, SC. 29006 Posts: 5,410	Re: Decode part# please 3817778 ttt __________________ 70 CST SWB 70 NOVA 93 Indy 500 Pace Truck (SOLD) 94 SILVERADO SWB 5/7 drop 2000 Silverado swb 2005 Nissan Altima 3.5 (Surprisingly very fast) 2004 GMC Yukon XL Denali BATESBURG, SC. 29006 29006 Some of my restorations http://www.snapfish.com/snapfish/thu...NAME=snapfish/ Restored Tach tins 8 cyl - 6 cyl http://67-72chevytrucks.com/vboard/s...d.php?t=518185 Contact info(Not my paypal address) DAWGSFAN227@YAHOO.COM God Bless Our Troops

03-13-2011, 08:40 AM	#4
GMCPaul Senior Member Join Date: Mar 2000 Location: Rockville,In. USA Posts: 3,718	Re: Decode part# please 3817778 Yes they are truck gears and make a 3:73 ratio, the GM master parts catalog shows 65-72 1/2 ton CK&P models and 70-72 Blazer used GM part # 3961415 which used part# 3817778 ( Ring Gear ) & part# 3884935 ( Pinion Gear )to make a Ring & Pinion set to make a 3:73 ratio gearing for the 65-72 1/2 ton truck. GMCPaul __________________ Secure Online Catalog for-GMCPauls Truck Parts Email- GMCPAULS@GMAIL.COM

03-13-2011, 11:05 AM	#5
PT'S 70 CST "GO DAWGS" Join Date: Oct 2003 Location: Batesburg, SC. 29006 Posts: 5,410	Re: Decode part# please 3817778 Here are some pics. I do not know if these are new or not. My friend bought these at a swap meet and wants to sell them but I just cannot tell. If they are not new they are in exc. cond. I cannot find any wear marks on them. I will post some pics of them and the pinion gear does read 3884935 11:41 6-71 GM. The ring gear reads 3817778 11:41 GM 6-71 1. Also on the base of the pinion gear it is stamped 1-14. You guys be the judge and I know this needs to be moved to the WIW section because he wants to sell them and I need to get an idea of what they are worth. Thanks guys PT Attached Images __________________ 70 CST SWB 70 NOVA 93 Indy 500 Pace Truck (SOLD) 94 SILVERADO SWB 5/7 drop 2000 Silverado swb 2005 Nissan Altima 3.5 (Surprisingly very fast) 2004 GMC Yukon XL Denali BATESBURG, SC. 29006 29006 Some of my restorations http://www.snapfish.com/snapfish/thu...NAME=snapfish/ Restored Tach tins 8 cyl - 6 cyl http://67-72chevytrucks.com/vboard/s...d.php?t=518185 Contact info(Not my paypal address) DAWGSFAN227@YAHOO.COM God Bless Our Troops Last edited by PT'S 70 CST; 03-13-2011 at 11:59 AM.

03-13-2011, 11:06 AM	#6
PT'S 70 CST "GO DAWGS" Join Date: Oct 2003 Location: Batesburg, SC. 29006 Posts: 5,410	Re: Decode part# please 3817778 1 More Attached Images __________________ 70 CST SWB 70 NOVA 93 Indy 500 Pace Truck (SOLD) 94 SILVERADO SWB 5/7 drop 2000 Silverado swb 2005 Nissan Altima 3.5 (Surprisingly very fast) 2004 GMC Yukon XL Denali BATESBURG, SC. 29006 29006 Some of my restorations http://www.snapfish.com/snapfish/thu...NAME=snapfish/ Restored Tach tins 8 cyl - 6 cyl http://67-72chevytrucks.com/vboard/s...d.php?t=518185 Contact info(Not my paypal address) DAWGSFAN227@YAHOO.COM God Bless Our Troops

03-13-2011, 08:09 AM	#3
68 Stepside huh? Join Date: May 2000 Location: Washington, Illinois Posts: 5,692	Re: Decode part# please 3817778 http://67-72chevytrucks.com/vboard/s...ad.php?t=73495 Pulled that thread up from the dead.... Here's another: http://www.hotrodders.com/forum/gm-r...ion-89342.html My guess is that they're truck gears. __________________ Someday when I'm lonely, Wishing you weren't so far away, Then I will remember Things we said today. RIP El Jay

03-13-2011, 05:08 PM	#7
PT'S 70 CST "GO DAWGS" Join Date: Oct 2003 Location: Batesburg, SC. 29006 Posts: 5,410	Re: Decode part# please 3817778 Any ideas guys what these are worth in this cond.. PT __________________ 70 CST SWB 70 NOVA 93 Indy 500 Pace Truck (SOLD) 94 SILVERADO SWB 5/7 drop 2000 Silverado swb 2005 Nissan Altima 3.5 (Surprisingly very fast) 2004 GMC Yukon XL Denali BATESBURG, SC. 29006 29006 Some of my restorations http://www.snapfish.com/snapfish/thu...NAME=snapfish/ Restored Tach tins 8 cyl - 6 cyl http://67-72chevytrucks.com/vboard/s...d.php?t=518185 Contact info(Not my paypal address) DAWGSFAN227@YAHOO.COM God Bless Our Troops

03-13-2011, 07:25 PM	#8
PT'S 70 CST "GO DAWGS" Join Date: Oct 2003 Location: Batesburg, SC. 29006 Posts: 5,410	Re: Decode part# please 3817778 68 Stepside and GMCPaul thanks for your help. PT __________________ 70 CST SWB 70 NOVA 93 Indy 500 Pace Truck (SOLD) 94 SILVERADO SWB 5/7 drop 2000 Silverado swb 2005 Nissan Altima 3.5 (Surprisingly very fast) 2004 GMC Yukon XL Denali BATESBURG, SC. 29006 29006 Some of my restorations http://www.snapfish.com/snapfish/thu...NAME=snapfish/ Restored Tach tins 8 cyl - 6 cyl http://67-72chevytrucks.com/vboard/s...d.php?t=518185 Contact info(Not my paypal address) DAWGSFAN227@YAHOO.COM God Bless Our Troops



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