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11-17-2015, 07:38 PM
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#1 |
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Registered User
Join Date: Jul 2007
Location: Salina, Kansas
Posts: 1,998
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1972 th400 speedo error, help?
Been awhile since I been on here but you always help so if anyone has input that would be great... I have a 72 c10 with 402 engine and a turbo 400 trans... Speedo used to work then the speedo gear housing broke so I ziptied it up to get it to work now it don't work again and I think I may of last some gizmos and gadgets.. Tires are 31x10.50r15 I believe.. And gear ratio is 3:08. I know that's how you change speedo but here's a pic of what I have its off google but I would need the housing, the driven and drive gear and all
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11-17-2015, 07:42 PM
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#2 | |
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Registered User
Join Date: Jul 2007
Location: Salina, Kansas
Posts: 1,998
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Quote:
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11-17-2015, 07:43 PM
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#3 | |
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Registered User
Join Date: Jul 2007
Location: Salina, Kansas
Posts: 1,998
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Quote:
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11-17-2015, 07:45 PM
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#4 |
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Registered User
Join Date: Jul 2007
Location: Salina, Kansas
Posts: 1,998
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Re: 1972 th400 speedo error, help?
Also, I have no dash lights. And only gauge that works is my oil pressure due to it being fluid driven I know.. And speedo is not working due to the issue listed above... I'm thinking I need to order a printed circuit board for the cluster since its original that's 40 some years old.. Am I correct? All the bulbs looks good just missing one bulb and one holder for it... Thoughts???
__________________
1972 C-10...402/400..flowmaster 40 series 1967 Mustang 347 stroker/C-4 1966 Mustang 289/3-speed 2013 Mustang V6/6speed w/300 ponies I may be 23, but i sure do knows 67-72s are sexy! Its not MPG its smiles per gallon! build started 11/25/08 build thread: http://67-72chevytrucks.com/vboard/s....php?p=2993796 |
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11-17-2015, 08:22 PM
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#5 |
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Senior Member
 
Join Date: Jun 2005
Location: Winona Lake, IN
Posts: 6,538
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Re: 1972 th400 speedo error, help?
I may be able to come up with that adapter. i will check tomorrow and let you know.
__________________
70 C/10 SWB 402/TH400/3.73 "The Needy Beast" 200,000 Mile Club Disc Brake Club Owner installed options: Front Sway Bar Power Steering Power Brakes Cigar Lighter Courtesy Lights Deluxe Side Markers Wiper Delay Sliding Rear Window Power Windows Power Locks Sniper EFI 2015 Silverado 1500 LS 4.3/6L80/3.23 lowered 2" front & rear |
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11-17-2015, 08:28 PM
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#6 |
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Senior Member
Join Date: Jan 2002
Location: Williston, ND
Posts: 2,999
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Re: 1972 th400 speedo error, help?
I just bought drive and driven gears off of eBay for my th400. You can get the housing too on there. There's plenty of online calculators that'll get you close on the number of teeth you need.
__________________
68 Chevy CST/10, 50th Anniversary, 327/th400, 373 posi, buckets 68 GMC Shortbox Stepside, 402/th400, Tilt, Tach, Bucket Seats, 3.08 Positraction 69 Chevy Camaro SS, 383, 4 speed, positraction 70 Chevy El Camino SS396, Triple Black, 454/th400, Tach 70 Chevy Shortbox Stepside 4x4, 350/th350, Tilt, Tach, Cab Lights, Bumper Guards, Tow Hooks 70 Chevy 3/4 Longbox, 350/auto, 70k, SURVIVOR 71 Chevy Blazer, CST, 350/auto 71 GMC Sierra K2500, 454, 4 speed, 4.10 posi, 37s 71 Custom/30, Open Road, 350/th400, tilt 72 Chevy Shortbox Fleetside, 496 Stroker/th400, Tilt, Tach, Bucket Seats, 3.42 Posi 72 GMC Sierra Grande 2500. 427/th400, tilt, a/c, tool and stowage, buckets/console, 3.54 posi |
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11-17-2015, 09:22 PM
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#7 |
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Registered User
Join Date: Apr 2013
Location: South Westerlo, New York
Posts: 1,325
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Re: 1972 th400 speedo error, help?
http://www.transmissioncenter.net/sp...n_______va.htm Go down the page a little ways, they sell them if the boys can't help you out...
__________________
Thanks, Joe.. 1969 C/10, 348 C.I., 3X2 bbl. V8, 2004r , LWB. |
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11-18-2015, 09:02 AM
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#8 |
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Senior Member
Join Date: Jun 2005
Location: Winona Lake, IN
Posts: 6,538
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Re: 1972 th400 speedo error, help?
Looks like to find out what driven gear you need, you will need to know what drive gear you have, and also the number of revolutions the speedo cable must turn to register one mile on the odometer.
__________________
70 C/10 SWB 402/TH400/3.73 "The Needy Beast" 200,000 Mile Club Disc Brake Club Owner installed options: Front Sway Bar Power Steering Power Brakes Cigar Lighter Courtesy Lights Deluxe Side Markers Wiper Delay Sliding Rear Window Power Windows Power Locks Sniper EFI 2015 Silverado 1500 LS 4.3/6L80/3.23 lowered 2" front & rear |
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12-03-2015, 10:40 AM
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#9 |
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Senior Member
Join Date: Jun 2005
Location: Winona Lake, IN
Posts: 6,538
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Re: 1972 th400 speedo error, help?
Tim, did you try connecting the speedo cable directly to the transmission? Try that and see if the speedometer works at all. If so, get a free gps speed app for your phone and see how far off it is. You may not need the adapter. When I bought my TH400 it had an adapter on it that was broken. I did not use it when I put the transmission in, and my speedo is slow by 3 mph per a gps app that I have on my phone. I have 3.73 gears though.
__________________
70 C/10 SWB 402/TH400/3.73 "The Needy Beast" 200,000 Mile Club Disc Brake Club Owner installed options: Front Sway Bar Power Steering Power Brakes Cigar Lighter Courtesy Lights Deluxe Side Markers Wiper Delay Sliding Rear Window Power Windows Power Locks Sniper EFI 2015 Silverado 1500 LS 4.3/6L80/3.23 lowered 2" front & rear |
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12-03-2015, 11:35 AM
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#10 |
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Senior Member
Join Date: Mar 2003
Location: Colfax-California
Posts: 8,713
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Re: 1972 th400 speedo error, help?
There are also going to be numbers on the side of the adapter that give the ratio percentage difference
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12-04-2015, 12:36 AM
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#11 |
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Registered User
Join Date: Jul 2007
Location: Salina, Kansas
Posts: 1,998
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Re: 1972 th400 speedo error, help?
Never knew any of that!! Thanks guys will do that this weekend!!! You guys are awesome thanks again y'all, I knew I could always get info here
__________________
1972 C-10...402/400..flowmaster 40 series 1967 Mustang 347 stroker/C-4 1966 Mustang 289/3-speed 2013 Mustang V6/6speed w/300 ponies I may be 23, but i sure do knows 67-72s are sexy! Its not MPG its smiles per gallon! build started 11/25/08 build thread: http://67-72chevytrucks.com/vboard/s....php?p=2993796 |
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12-07-2015, 11:24 PM
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#12 |
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Registered User
Join Date: Jul 2007
Location: Salina, Kansas
Posts: 1,998
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Re: 1972 th400 speedo error, help?
Got it all fixed
__________________
1972 C-10...402/400..flowmaster 40 series 1967 Mustang 347 stroker/C-4 1966 Mustang 289/3-speed 2013 Mustang V6/6speed w/300 ponies I may be 23, but i sure do knows 67-72s are sexy! Its not MPG its smiles per gallon! build started 11/25/08 build thread: http://67-72chevytrucks.com/vboard/s....php?p=2993796 |
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