MI Speedometer Gear Reducer Ratio Adapter (5) Original GMC - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**jimmy70** · 12-04-2022, 06:15 PM

Speedometer Gear Reducer Ratio Adapter (5) Original / Stewart Warner / Made in USA
-for 4 x 4 application
-removed from 69 thru 72 stock NP 205 applications
-all in working condition
-please check numbers for your gear drive application

#1 - 666 F / .9444

#2 - 666 F R6 / .8974 B

#3 - 666 F 03 / 1.2020 // SOLD / RECEIVED payment from BLT gmc

#4 - 666 F F5 / .8241 C

#5 - 666 F W7 / .9743 Y

Lowered $35 each + shipping / pp fees

Toro · 12-04-2022, 10:38 PM

Marko,
I need to double-check my transfer case and see which one I have. My speed registers way too fast. Any chance you know what should have been on a TH350 with stock 3.07 rear end? Thanks, Jon.

**jimmy70** · 12-05-2022, 04:09 PM

Toro, not sure how to calculate the correct gear box based on your gear ratio and tire size. Someone on the web did at one time explain how to do that. If whoever it was can please chime in and help TORO out. ty

**gmc 2500 4x4** · 12-06-2022, 06:28 AM

https://67-72chevytrucks.com/vboard/...d.php?t=828054

jjzepplin · 12-06-2022, 07:33 AM

So that's what those are...

**jimmy70** · 12-06-2022, 04:52 PM

Thank you GMC 2500 4x4 for this list of gear ratio adapters

https://speedometercablesusa.com/gear_box_adapters.html

Toro, thx to GMC 2500 4x4 you can see what gear ratio adapter to apply

**jimmy70** · 12-30-2022, 09:46 AM

Lowered price

**jimmy70** · 01-07-2023, 09:26 AM

ttt

BLT gmc · 01-07-2023, 05:05 PM

Will these work with a T-221? If so, I’m interested in number three

Can you give ship and PP fees for 51555, please

**jimmy70** · 01-14-2023, 09:44 AM

ttt

**jimmy70** · 01-31-2023, 04:22 PM

ttt

BLT gmc · 01-31-2023, 06:36 PM

I will take #3 . I have been unable to determine if it will work with my T221. But I am will to gamble. Send me the total and PP, please

**jimmy70** · 01-31-2023, 07:28 PM

#3 SOLD pending payment from BLT gmc.

I sent you a pm with total shipping price and my pay pal account. ty, marko

BLT gmc · 01-31-2023, 08:18 PM

PP sent. PM sent with address

**jimmy70** · 01-31-2023, 08:42 PM

#3 SOLD / Received payment from BLT gmc. thank you, marko // I sent you pm

**jimmy70** · 02-07-2023, 06:46 PM

ttt

jaybatta · 10-03-2023, 11:42 PM

I have a handful of these as well..know a good place to reference the numbers on them?

**jimmy70** · 10-07-2023, 07:31 AM

GMC 2500 4x4 sent me a link / it's in my earlier post responce

**jimmy70** · 10-27-2023, 05:13 PM

$45 each + shipping /pp fees

roger0080 · 10-29-2023, 02:56 PM

Quote:

Originally Posted by jaybatta

I have a handful of these as well..know a good place to reference the numbers on them?

Try this post response from the 72TL parts book:
http://67-72chevytrucks.com/vboard/s...73&postcount=6

**jimmy70** · 10-29-2023, 07:06 PM

same as 12-06-22 response on this thread

**jimmy70** · 11-23-2023, 08:32 AM

ttt

**jimmy70** · 01-27-2024, 07:47 PM

ttt

12-06-2022, 04:52 PM	#6
jimmy70 Senior Member Join Date: Aug 2007 Location: Warren,Michigan Posts: 1,136	Re: Speedometer Gear Reducer Ratio Adapter (5) Original GMC Thank you GMC 2500 4x4 for this list of gear ratio adapters https://speedometercablesusa.com/gear_box_adapters.html Toro, thx to GMC 2500 4x4 you can see what gear ratio adapter to apply

12-30-2022, 09:46 AM	#7
jimmy70 Senior Member Join Date: Aug 2007 Location: Warren,Michigan Posts: 1,136	Re: Speedometer Gear Reducer Ratio Adapter (5) Original GMC Lowered price

01-07-2023, 09:26 AM	#8
jimmy70 Senior Member Join Date: Aug 2007 Location: Warren,Michigan Posts: 1,136	Re: Speedometer Gear Reducer Ratio Adapter (5) Original GMC ttt

01-07-2023, 05:05 PM	#9
BLT gmc Registered User Join Date: Feb 2014 Location: West Iowa Posts: 1,106	Re: Speedometer Gear Reducer Ratio Adapter (5) Original GMC Will these work with a T-221? If so, I’m interested in number three Can you give ship and PP fees for 51555, please Last edited by BLT gmc; 01-07-2023 at 05:11 PM.

01-14-2023, 09:44 AM	#10
jimmy70 Senior Member Join Date: Aug 2007 Location: Warren,Michigan Posts: 1,136	Re: Speedometer Gear Reducer Ratio Adapter (5) Original GMC ttt

12-04-2022, 06:15 PM	#1
jimmy70 Senior Member Join Date: Aug 2007 Location: Warren,Michigan Posts: 1,136	Speedometer Gear Reducer Ratio Adapter (5) Original GMC Speedometer Gear Reducer Ratio Adapter (5) Original / Stewart Warner / Made in USA -for 4 x 4 application -removed from 69 thru 72 stock NP 205 applications -all in working condition -please check numbers for your gear drive application #1 - 666 F / .9444 #2 - 666 F R6 / .8974 B #3 - 666 F 03 / 1.2020 // SOLD / RECEIVED payment from BLT gmc #4 - 666 F F5 / .8241 C #5 - 666 F W7 / .9743 Y Lowered $35 each + shipping / pp fees Attached Images Last edited by jimmy70; 09-14-2024 at 06:13 PM. Reason: Lowered price

12-04-2022, 10:38 PM	#2
Toro Registered User Join Date: Nov 2018 Location: Huntsville, AL Posts: 338	Re: Speedometer Gear Reducer Ratio Adapter (5) Original GMC Marko, I need to double-check my transfer case and see which one I have. My speed registers way too fast. Any chance you know what should have been on a TH350 with stock 3.07 rear end? Thanks, Jon.

12-05-2022, 04:09 PM	#3
jimmy70 Senior Member Join Date: Aug 2007 Location: Warren,Michigan Posts: 1,136	Re: Speedometer Gear Reducer Ratio Adapter (5) Original GMC Toro, not sure how to calculate the correct gear box based on your gear ratio and tire size. Someone on the web did at one time explain how to do that. If whoever it was can please chime in and help TORO out. ty

12-06-2022, 06:28 AM	#4
gmc 2500 4x4 Senior Member Join Date: Mar 2012 Location: ripley ny Posts: 2,960	Re: Speedometer Gear Reducer Ratio Adapter (5) Original GMC https://67-72chevytrucks.com/vboard/...d.php?t=828054

12-06-2022, 07:33 AM	#5
jjzepplin Registered User Join Date: Feb 2012 Location: Ruskin Florida Posts: 4,566	Re: Speedometer Gear Reducer Ratio Adapter (5) Original GMC So that's what those are... __________________ 70 swb 4x4 406sbc 700r4 203/205 d60/14blt locker yadda yadda http://67-72chevytrucks.com/vboard/s...88#post6935688 Yeller 72 Blazer 2wd conversion project "No Daggum Money" http://67-72chevytrucks.com/vboard/s...d.php?t=550804 LS1-T56 3.73 LSD super budget build Blanco-2014 Sierra SWB https://67-72chevytrucks.com/vboard/...d.php?t=810350

01-31-2023, 04:22 PM	#11
jimmy70 Senior Member Join Date: Aug 2007 Location: Warren,Michigan Posts: 1,136	Re: Speedometer Gear Reducer Ratio Adapter (5) Original GMC ttt

01-31-2023, 06:36 PM	#12
BLT gmc Registered User Join Date: Feb 2014 Location: West Iowa Posts: 1,106	Re: Speedometer Gear Reducer Ratio Adapter (5) Original GMC I will take #3 . I have been unable to determine if it will work with my T221. But I am will to gamble. Send me the total and PP, please

01-31-2023, 07:28 PM	#13
jimmy70 Senior Member Join Date: Aug 2007 Location: Warren,Michigan Posts: 1,136	Re: Speedometer Gear Reducer Ratio Adapter (5) Original GMC #3 SOLD pending payment from BLT gmc. I sent you a pm with total shipping price and my pay pal account. ty, marko

01-31-2023, 08:18 PM	#14
BLT gmc Registered User Join Date: Feb 2014 Location: West Iowa Posts: 1,106	Re: Speedometer Gear Reducer Ratio Adapter (5) Original GMC PP sent. PM sent with address

01-31-2023, 08:42 PM	#15
jimmy70 Senior Member Join Date: Aug 2007 Location: Warren,Michigan Posts: 1,136	Re: Speedometer Gear Reducer Ratio Adapter (5) Original GMC #3 SOLD / Received payment from BLT gmc. thank you, marko // I sent you pm



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02-07-2023, 06:46 PM	#16
jimmy70 Senior Member Join Date: Aug 2007 Location: Warren,Michigan Posts: 1,136	Re: Speedometer Gear Reducer Ratio Adapter (5) Original GMC ttt

10-03-2023, 11:42 PM	#17
jaybatta Registered User Join Date: Apr 2014 Location: Livingston, MT Posts: 838	Re: Speedometer Gear Reducer Ratio Adapter (5) Original GMC I have a handful of these as well..know a good place to reference the numbers on them? __________________ Joe 1968 K20 1970 K20 Semper Fi

10-07-2023, 07:31 AM	#18
jimmy70 Senior Member Join Date: Aug 2007 Location: Warren,Michigan Posts: 1,136	Re: Speedometer Gear Reducer Ratio Adapter (5) Original GMC GMC 2500 4x4 sent me a link / it's in my earlier post responce

10-27-2023, 05:13 PM	#19
jimmy70 Senior Member Join Date: Aug 2007 Location: Warren,Michigan Posts: 1,136	Re: Speedometer Gear Reducer Ratio Adapter (5) Original GMC $45 each + shipping /pp fees

10-29-2023, 07:06 PM	#21
jimmy70 Senior Member Join Date: Aug 2007 Location: Warren,Michigan Posts: 1,136	Re: Speedometer Gear Reducer Ratio Adapter (5) Original GMC same as 12-06-22 response on this thread

11-23-2023, 08:32 AM	#22
jimmy70 Senior Member Join Date: Aug 2007 Location: Warren,Michigan Posts: 1,136	Re: Speedometer Gear Reducer Ratio Adapter (5) Original GMC ttt

01-27-2024, 07:47 PM	#23
jimmy70 Senior Member Join Date: Aug 2007 Location: Warren,Michigan Posts: 1,136	Re: Speedometer Gear Reducer Ratio Adapter (5) Original GMC ttt

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