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HAPPY
BIRTHDAY
C A N A D A
July 1
Over 2022 Bolters live "up over" ... a cool addition to the flavor of
The Stovebolt Page.
Birthday salutes here!
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Oh Lord, I just gotta find it....
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Forums59
Topics128,032
Posts1,036,685
Members45,918
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Most Online1,229
Jan 21st, 2020
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Joined: Aug 2018
Posts: 435
OP
'Bolter
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I've seen a gear corrector that corrects for the error in the speedometer when you change the differential gears from 4:11 to 3:55. I think I'd like to add one of these to my truck, assuming that they're still available. My question is: are they reasonably accurate, and mainly, do they hold up OK and last for a long time?
Mike Burns
1940 Chev 1/2 ton
1953 Chev 1/2 ton
1953 Ford Victoria
1950 Studebaker Starlight Coupe
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Joined: Jun 2011
Posts: 4,494
'Bolter
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Speedo shops can make up most any permanent ratio adapter for your new diff. ratio which is a routine operation for many trucks.
Ed
'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
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Joined: Jan 2002
Posts: 2,259
'Bolter
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Way back when I changed my gears to the infamous 3:55, my local speedo shop was able to produce a gear adapter. The speedo reads dead on and it's been 15+ years. I periodically check all my vehicle speedo by using a phone app call Speedbox.
Craig's '50 Chevy 3100 5 window My truck If I'm not working on my truck or VW camper, I'm fishing with the wife or smoking Salmon.
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Joined: Mar 2010
Posts: 1,204
Curmudgeon
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https://www.bobsspeedometer.com/products/ratio-adapters/I haven't used them but they seem knowledgeable and willing to talk.
"Adding CFM to a truck will only help at engine speeds you don't want to use."
"I found there was nothing to gain beyond 400 CFM."
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Joined: Sep 2001
Posts: 31,564
Bubba - Curmudgeon
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Joined: Jan 2002
Posts: 2,259
'Bolter
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Tim,
Thanks for posting the link. Looks just like the one I'm using.
Craig's '50 Chevy 3100 5 window My truck If I'm not working on my truck or VW camper, I'm fishing with the wife or smoking Salmon.
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Joined: Sep 2001
Posts: 31,564
Bubba - Curmudgeon
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Craig, I have been using a similar ratio adapter since 2007.
As you know, if you use the measured/timed mile technique, that type of ratio-adapter adjusts for gearing and tires diameters.
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Joined: Feb 2016
Posts: 679
'Bolter
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I used bobsspeedometer for the factory speedo and tach in my fiberglass Chevrolet, I had put new needles on them and a new circuit board for the tach. I drove to his shop, told him what I needed, he looked at what I had in my hands and knew what they were from, calibrated them on the spot while I was there, didn't want any money for the work, I gave him some money and both units are still working after 20 years.
1957 Chevrolet 5700 LCF 283 SM420 single speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto
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Joined: Dec 2008
Posts: 1,090
'Bolter
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I've also have done business with bobsspeedometer with good results.
Brian
1955.2 3100 Truck
The older I get the more dangerous I am!!!!!
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