03-21-2010, 01:22 PM | #1 |
resident wrencher
Join Date: Dec 2006
Location: ramona california
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100 mph
i got a 100 mph speedo to relpace my 85 mph speedo but i want my milage too be correct how can i accomplish this task ? or is there even a way
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03-21-2010, 01:39 PM | #2 |
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Join Date: Feb 2007
Location: Austin, TX
Posts: 3,930
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Re: 100 mph
The speedometer gears in the transmission have to be right for the rear end gears and tire size. As long as the speedometer itself is working properly, it will show the right speed. Seems like with age/use the internal spring in the speedometer can get weak and they sometimes need to be recalibrated.
However, given correct gears in the transmission and speedometers that work properly, the 100MPH speedometer is a direct swap for the 85 MPH unit.
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1977 GMC Sierra Grande Last edited by Pyrotechnic; 03-21-2010 at 01:40 PM. |
03-21-2010, 02:14 PM | #3 |
resident wrencher
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Location: ramona california
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Re: 100 mph
thanks i knew that already i need to knw if there is any way possable to make the odomerter read the milage on my current speo mine has 28xxx and the new one has 42xxx miles how can i roll or advance the new one to match my truck current mialge
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03-21-2010, 02:48 PM | #4 |
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Location: Milwaukee, WI
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Re: 100 mph
if i remember correctly i believe that rolling it at all is a felony
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03-21-2010, 03:41 PM | #5 |
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Location: West Jefferson, OH
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Re: 100 mph
It is against the law I believe, but I'm honest and have no problem setting one to the correct mileage. It can be done if you take the scroll wheel thingy apart, but I can never remember exactly how to do it. I have to figure it out again every time. It's always been Camaro speedos though, but I'd imagine it would be basically the same.
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03-21-2010, 04:12 PM | #6 |
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Location: Austin, TX
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Re: 100 mph
Oops I read your post wrong. Not sure how to do it, but I know it can be done. I don't think it's illegal because trucks this old are mileage exempt.
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1977 GMC Sierra Grande |
03-21-2010, 04:14 PM | #7 |
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Re: 100 mph
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03-21-2010, 09:11 PM | #8 |
resident wrencher
Join Date: Dec 2006
Location: ramona california
Posts: 720
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Re: 100 mph
cool thanks i dont rele care about the law implications becuase who else is gunna know and who would care espically if its the correct mileage right
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03-21-2010, 09:24 PM | #9 | |
Chevys Kick A$$
Join Date: Jan 2005
Location: Zootown, MT
Posts: 12,699
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Re: 100 mph
Quote:
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*HOODS is what I answer too* -'79, '77, '88 Pickup Sold, '85 Camaro, '83 T/A, '81,'83,'90 K5 Blazer All Sold -'79 3/4 ton "Big Yellow Bananna" Lifted 4spd. 39.5 TSL Swampers, The money Pit -'86 K5 Blazer Silverado 6.2 4" lift 35"s -'95 Ext. Cab Shorty 4" Tuff Country rolling 35" M/T's -'83 Monte Carlo T-Tops. 126,500 Original Miles -LATER I would rather push a Chevy then drive a ford!!
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03-21-2010, 09:25 PM | #10 |
The One And Only !!!
Join Date: Jan 2007
Location: Hole in the woods Florida
Posts: 4,567
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Re: 100 mph
You just advertised on the world wide web.....
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93 Jeep XJ 88 Buick La Sabra Toys; 88 TA-GTA in the works.... 97 GMC Ext. Cab 502 Crate 5 Spd......Sucks Gas But Haulz Azz ! The primary function of an Engineer is to make it difficult for the Fabricator and impossible for the Mechanic. "Why go out preserved when you can go out beat up, worn out, sliding in sideways screaming, Holy Sh!t What A Ride" !!!
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03-21-2010, 09:28 PM | #11 |
resident wrencher
Join Date: Dec 2006
Location: ramona california
Posts: 720
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Re: 100 mph
eh o well right im sure the cops got bigger fish to fry
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03-21-2010, 09:42 PM | #12 |
Chevys Kick A$$
Join Date: Jan 2005
Location: Zootown, MT
Posts: 12,699
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Re: 100 mph
LOL u never know jk man you should be fine
__________________
*HOODS is what I answer too* -'79, '77, '88 Pickup Sold, '85 Camaro, '83 T/A, '81,'83,'90 K5 Blazer All Sold -'79 3/4 ton "Big Yellow Bananna" Lifted 4spd. 39.5 TSL Swampers, The money Pit -'86 K5 Blazer Silverado 6.2 4" lift 35"s -'95 Ext. Cab Shorty 4" Tuff Country rolling 35" M/T's -'83 Monte Carlo T-Tops. 126,500 Original Miles -LATER I would rather push a Chevy then drive a ford!!
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