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10-11-2013, 12:36 PM
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#1 |
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Registered User
 
Join Date: Sep 2012
Location: Spring, Tx.
Posts: 479
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What is this thing??
I replaced the speedo transmission seals and this was between the transmission and the speedo cable. it was really loose with no fix and the cable looked like it fit to the trans without it. I searched through the posts on how to do the job and didnt see such a thing on the other transmissions.So I left it off and the speedo works like a charm with out it. Anybody know what it is. its made by Stewart Warner!
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10-11-2013, 12:41 PM
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#2 |
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Registered User
Join Date: Jun 2010
Location: Upland Ca
Posts: 4,147
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Re: What is this thing??
Looks like a device to correct the speedometer reading.
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1972 C10 SWB, Air, PS, PB, 350/350THM. Second owner. 1965 Corvette roadster, 44K miles, 327/365 SHP, 4 speed, side exhaust, knockoffs, teak, second owner (bought in 1970), Have ALL numbers matching components. My frame off restoration thread: http://67-72chevytrucks.com/vboard/s...d.php?t=556703 |
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10-11-2013, 12:44 PM
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#3 | |
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Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,945
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Re: What is this thing??
Quote:
X2 It was a add on speed correction.  
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1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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10-11-2013, 12:55 PM
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#4 |
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Restoring it $200 at a time...
Join Date: Aug 2008
Location: NE Kansas
Posts: 887
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Re: What is this thing??
Don't trash it; someone will want it when they change tire sizes. It should be stamped with a ratio of some sort. 1.059:1, 0.833:1, something.
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Charter member of the 'Put the dimmer switch back on the damn floor where it belongs' Society '68 5.3L-4 speed LWB C20; grandpa bought it for the farm in '71. Now LS 5.3, rather than 327. DD '09 Pilot Weekender '65 Skylark 300-4V-4 speed Wife's '07 Lexus ES350; 117 actuator motors and I can't see the engine. Son's '04 F250 SuperCab 6.0 |
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10-11-2013, 02:16 PM
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#5 | |
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Registered User
Join Date: May 2009
Location: Motor City
Posts: 9,226
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Re: What is this thing??
Quote:
It should be stamped on the side (on that flat embossment) what the correction factor is. I usually keep a couple around for just such an emergency. K
__________________
Chevrolet Flint Assembly 1979-1986 GM Full Size Truck Engineering 1986 - 2019 Intro from an Old Assembly Guy: http://67-72chevytrucks.com/vboard/s...d.php?t=342926 My Pontiac story: http://forums.maxperformanceinc.com/...d.php?t=560524 Chevelle intro: http://www.superchevy.com/features/s...hevy-chevelle/ |
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10-11-2013, 07:13 PM
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#6 | |
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Registered User
Join Date: Sep 2012
Location: Spring, Tx.
Posts: 479
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Re: What is this thing??
Quote:
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10-11-2013, 12:43 PM
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#7 |
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Senior Member
Join Date: May 2003
Location: Sandown, NH
Posts: 2,850
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Re: What is this thing??
That's an adapter that I know is found on 4x4's to correct the spdo reading.
Kinda like a gear reduction to make the speedo read correctly.
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Gary 72 SWB 4x4 My 72 SWB Build http://67-72chevytrucks.com/vboard/s...d.php?t=259859 |
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10-11-2013, 12:56 PM
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#8 |
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Registered User
Join Date: Sep 2012
Location: Spring, Tx.
Posts: 479
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Re: What is this thing??
Hmm, Ok thanks for all the replies. I didnt see much of a difference on the speedo but maybe I need to drive it a little more. I think it was the source for the mysterious red spot on the garage floor though lol!! thanks again everyone!
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10-11-2013, 07:36 PM
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#9 |
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Registered User
Join Date: Jul 2011
Location: Farmville, Va
Posts: 3,026
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Re: What is this thing??
I must agree it's a speedo correction device
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10-12-2013, 06:42 AM
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#10 |
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1969 Custom 30 wrecker
Join Date: Sep 2001
Location: Pottsville, Pa
Posts: 2,611
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Re: What is this thing??
It might be factory too. (correct me if I'm wrong)
Both my 71 3/4 ton and my 69 Custom 30 wrecker have those. Both have the 4 speed and 4.10 rear. I've seen them on junkyard trucks with these combos too.
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Bob 63 Impala 283/PG/3.36 (under restoration) 66 Impala 327/PG/3.36 66 Chevelle SS 409/M22/3.55 69 Chevelle 307/PG/3.08 (future restoration) 69 C10 short stepside 454/TH350/3.73 69 Custom 30 tow truck 350/4 spd/4.10 (resto done, CRUISIN TIME!) 71 Cheyenne 20 fleetside 350/4 spd/4.10 71 Chevelle 6/PG/3.08 72 Chevelle 454/M21/4.10 |
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10-12-2013, 09:28 AM
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#11 |
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Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,731
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Re: What is this thing??
And you can buy them new in most any ratio you need.
Look here. http://www.transmissioncenter.net/sp...____va.htm#350 |
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10-12-2013, 06:35 PM
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#12 |
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frankenstien Fabrications
Join Date: Apr 2009
Location: Billings Montana
Posts: 222
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Re: What is this thing??
is your speedo correct now ? wouldn't want to get a speeding ticket for going 10 or more over
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frankenstein Fabrications |
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10-12-2013, 07:56 PM
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#13 |
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Registered User
Join Date: Oct 2007
Location: Spanaway
Posts: 8,451
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Re: What is this thing??
Yep its for speedo calibration, i have one on my truck too.
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Mike. Swamp Rat build thread : http://67-72chevytrucks.com/vboard/s...d.php?t=595019 72 3/4T 4X4 4" BDS Lift 33" BFG's |
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10-12-2013, 08:55 PM
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#14 |
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Roto Reuter thats the name...
Join Date: Feb 2010
Location: Darien, NY
Posts: 1,853
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Re: What is this thing??
Yes, speed ratio adapters. I've got one on both my 69 C20 and 70 K10. The one is coming off of my C20 though because I'm converting to a Dakota Digital VHX gauge cluster and won't need it any more.
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~ Dan  My 70 K10 SWB build:http://67-72chevytrucks.com/vboard/s...d.php?t=782232 My 71 SWB build:http://67-72chevytrucks.com/vboard/s...d.php?t=651394 1970 SWB Fleet K10 4X4, 5.3L LM7, 4L60E, Dakota Digital RTX, Vintage Air, Ididit tilt 1971 SWB Fleet C10 - Original SWB Arizona truck, new custom restoration project "Kick out your motor and drive while you're still alive - kick it out!" - Heart 1977 |
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