Speedometer/Odometer Not Working.
Thread Starter
Junior Member
Joined: Aug 2017
Posts: 68
Likes: 1
From: Lake Elsinore CA.
Car: 1987 Camaro Iroc Z28
Engine: 5.7 TPI
Transmission: 700R4
Speedometer/Odometer Not Working.
Can someone help me out. This speedgear is from my 1987 Camaro Iroc Z, 5.7, TPI with a 700R4 transmission. It's a stock car my speedometer stop working and come to find out that somehow the speedgear got strip. Do you guys have a part number and where can I get a replacement. Thanks in advance.
https://www.thirdgen.org/forums/atta...1&d=1508076687
https://www.thirdgen.org/forums/atta...1&d=1508076687
Last edited by JuanZ28; Oct 15, 2017 at 09:41 AM.
Joined: Sep 2005
Posts: 27,918
Likes: 2,448
Car: Yes
Engine: Usually
Transmission: Sometimes
Axle/Gears: Behind me somewhere
Re: Speedometer/Odometer Not Working.
https://transmissioncenter.net/?swoo...edometer-gears
Those gears don't generally strip all by themselves; usually they do that because what they're trying to turn, is stuck. Which would of course be the cable.
Might want to pull the speedo cable core out and lube it before it just tears up another gear.
Those gears don't generally strip all by themselves; usually they do that because what they're trying to turn, is stuck. Which would of course be the cable.
Might want to pull the speedo cable core out and lube it before it just tears up another gear.
Thread Starter
Junior Member
Joined: Aug 2017
Posts: 68
Likes: 1
From: Lake Elsinore CA.
Car: 1987 Camaro Iroc Z28
Engine: 5.7 TPI
Transmission: 700R4
Re: Speedometer/Odometer Not Working.
The Speedo cable core does turns freely. Although I did see like a spring coil twisted up on the input part of the Speedo cable that goes into the speedgear that got strip out. I also had a transmission rebuilt recently and was wondering if they install something wrong or was it normal wear and tear.
Joined: Dec 2004
Posts: 16,771
Likes: 1,001
From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: Speedometer/Odometer Not Working.
What was it before 42 ?
https://www.summitracing.com/search/...on-Type/700R4/
45 ?
https://m.ebay.com/itm/700R4-4L60-TH...257Ciid%253A23
https://www.summitracing.com/search/...on-Type/700R4/
45 ?
https://m.ebay.com/itm/700R4-4L60-TH...257Ciid%253A23
Last edited by Tuned Performance; Oct 15, 2017 at 03:49 PM.
Thread Starter
Junior Member
Joined: Aug 2017
Posts: 68
Likes: 1
From: Lake Elsinore CA.
Car: 1987 Camaro Iroc Z28
Engine: 5.7 TPI
Transmission: 700R4
Re: Speedometer/Odometer Not Working.
Thanks. I don't know what it was before but I will remove it again and try to get a tooth count.
Joined: Dec 2004
Posts: 16,771
Likes: 1,001
From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: Speedometer/Odometer Not Working.
You can use a calculator based on the drive gear looks like a 17, tire size and rear men’s ratio.
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Joined: Dec 2004
Posts: 16,771
Likes: 1,001
From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: Speedometer/Odometer Not Working.
Or use this chart
Okay, I've had enough whining from the lazy and the weak-minded.
So I decided to just start on a cheat sheet. Not all combinations
can be exactly calibrated, but here's the best possible calibration
for each combination given.
This first batch is for anyone using a 700R-4 with any of these tire
sizes on the rear axle of their car:
205/60R15
225/55R16
245/50R16
245/45R17
275/40R17
315/35R17
245/40R18
If your tire size isn't here, don't use these results.
2.73:1 use 41 tooth driven with 19 tooth drive
2.77:1 39 18
2.86:1 38 17
2.93:1 39 17
3.00:1 40 17
3.07:1 41 17
3.07:1 36 15
3.08:1 41 17
3.08:1 36 15
3.23:1 38 15
3.23:1 43 17
3.25:1 38 15
3.27:1 44 17
3.31:1 44 17
3.31:1 39 15
3.42:1 40 15
3.45:1 41 15
3.50:1 41 15
3.54:1 42 15
3.55:1 42 15
3.70:1 44 15
3.73:1 44 15
more no cal.
So I decided to just start on a cheat sheet. Not all combinations
can be exactly calibrated, but here's the best possible calibration
for each combination given.
This first batch is for anyone using a 700R-4 with any of these tire
sizes on the rear axle of their car:
205/60R15
225/55R16
245/50R16
245/45R17
275/40R17
315/35R17
245/40R18
If your tire size isn't here, don't use these results.
2.73:1 use 41 tooth driven with 19 tooth drive
2.77:1 39 18
2.86:1 38 17
2.93:1 39 17
3.00:1 40 17
3.07:1 41 17
3.07:1 36 15
3.08:1 41 17
3.08:1 36 15
3.23:1 38 15
3.23:1 43 17
3.25:1 38 15
3.27:1 44 17
3.31:1 44 17
3.31:1 39 15
3.42:1 40 15
3.45:1 41 15
3.50:1 41 15
3.54:1 42 15
3.55:1 42 15
3.70:1 44 15
3.73:1 44 15
more no cal.
Thread Starter
Junior Member
Joined: Aug 2017
Posts: 68
Likes: 1
From: Lake Elsinore CA.
Car: 1987 Camaro Iroc Z28
Engine: 5.7 TPI
Transmission: 700R4
Re: Speedometer/Odometer Not Working.
Well just installed a new driven gear and test drove my car and speedometer and mileage was working again. Shortly after it stop working again. My question now is if my transmission has a shift kit or lockup converter can this cause the Driven gear to strip out?
Joined: Dec 2004
Posts: 16,771
Likes: 1,001
From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: Speedometer/Odometer Not Working.
Did you pull the cable and lube with graphite ?
Joined: Sep 2005
Posts: 27,918
Likes: 2,448
Car: Yes
Engine: Usually
Transmission: Sometimes
Axle/Gears: Behind me somewhere
Re: Speedometer/Odometer Not Working.
if my transmission has a shift kit or lockup converter can this cause the Driven gear to strip out?
See my signature for a helpful mental technique that you can put to good use. You may rest assured, there are plenty of people with stock (lockout type) converters and shift kits, whose speedo cables don't bind and tear up speedo gears one after another.
Might want to pull the speedo cable core out and lube it before it just tears up another gear.
Might want to also check your cruise regulator for binding, if you have that.
Thread Starter
Junior Member
Joined: Aug 2017
Posts: 68
Likes: 1
From: Lake Elsinore CA.
Car: 1987 Camaro Iroc Z28
Engine: 5.7 TPI
Transmission: 700R4
Re: Speedometer/Odometer Not Working.
I didn't lube the cable. I inspected the speedometer cable and it spins freely.
Thread Starter
Junior Member
Joined: Aug 2017
Posts: 68
Likes: 1
From: Lake Elsinore CA.
Car: 1987 Camaro Iroc Z28
Engine: 5.7 TPI
Transmission: 700R4
Re: Speedometer/Odometer Not Working.
Thanks Sofakingdom for the info. I'm going to buy a new cable and find out how to troubleshoot the Cruise Regulator.