speedo drive gear missing?
Thread Starter
Supreme Member
Joined: Nov 2007
Posts: 1,092
Likes: 1
From: IL
Car: 88 IROC, 76 Malibu Classic
Engine: 350 TPI, 350
Transmission: 700R4, 4-speed
Axle/Gears: 10 bolt ????
speedo drive gear missing?
hi, I have an 89 camaro w/ a T5 and have had some trouble w/ the speedo since owning the car. I put a new speedo cable in because the old one was pretty much destroyed, but that didn't fix it. I reached my finger into the housing to feel if the drive gear was locked up or not, but its simply not there. Is this a common occurance? I know I have to remove the tailshaft to get to it, but what could have broke to make this happen? how much do these cost and are they very easy to install? any input would be appriciated.
thank you
thank you
Last edited by chevyracingrox; Dec 31, 2008 at 01:53 PM.
Joined: Aug 1999
Posts: 19,282
Likes: 103
From: Lawrence, KS
Car: Met. Silver 85 IROC/Sold
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's
Re: speedo drive gear missing?
https://www.thirdgen.org/forums/tran...ve-driven.html
JamesC
Joined: Jun 2002
Posts: 1,296
Likes: 6
From: Vancouver, WA
Car: 87 IROC-Z28
Engine: 305 TPI-New 355 on the engine stand
Transmission: T56
Axle/Gears: 3.73 Eaton posi-Soon a 9" Ford!
Re: speedo drive gear missing?
Before I swapped my T56 in I had two speedometer cables break with my T5. Was the bottom cables both times that broke, and both were caused by a bad upper cable. I didn't realize this was what was happening the first time unfortunately. The last time the cable seized up and locked the driven gear from turning. The gears work like a thread on a bolt. You stop the driven gear and the drive gear just threaded itself forward on the output shaft since there is only a little clip holding it in place. Had to pull the trans to get the gear back in place. Was a real pain just to fix my speedometer. I replaced my two part cable with a new 1 piece unit from a parts store. Works great and cost about $12 as I recall.
This may be what happened to you. Unfortunately you will have to get the tail housing off to see what's going on in there. Good luck.
This may be what happened to you. Unfortunately you will have to get the tail housing off to see what's going on in there. Good luck.
Thread Starter
Supreme Member
Joined: Nov 2007
Posts: 1,092
Likes: 1
From: IL
Car: 88 IROC, 76 Malibu Classic
Engine: 350 TPI, 350
Transmission: 700R4, 4-speed
Axle/Gears: 10 bolt ????
Re: speedo drive gear missing?
Before I swapped my T56 in I had two speedometer cables break with my T5. Was the bottom cables both times that broke, and both were caused by a bad upper cable. I didn't realize this was what was happening the first time unfortunately. The last time the cable seized up and locked the driven gear from turning. The gears work like a thread on a bolt. You stop the driven gear and the drive gear just threaded itself forward on the output shaft since there is only a little clip holding it in place. Had to pull the trans to get the gear back in place. Was a real pain just to fix my speedometer. I replaced my two part cable with a new 1 piece unit from a parts store. Works great and cost about $12 as I recall.
This may be what happened to you. Unfortunately you will have to get the tail housing off to see what's going on in there. Good luck.
This may be what happened to you. Unfortunately you will have to get the tail housing off to see what's going on in there. Good luck.
I think I'm gonna take the tail shaft off today. I'll post pics if I do.
Thread Starter
Supreme Member
Joined: Nov 2007
Posts: 1,092
Likes: 1
From: IL
Car: 88 IROC, 76 Malibu Classic
Engine: 350 TPI, 350
Transmission: 700R4, 4-speed
Axle/Gears: 10 bolt ????
Re: speedo drive gear missing?
Never heard of that happening under normal driving circumstances. Not costly. More difficult to install. Check the following link (which is also a sticky):
https://www.thirdgen.org/forums/tran...ve-driven.html
JamesC
https://www.thirdgen.org/forums/tran...ve-driven.html
JamesC
got everything taken apart, my speedo drive gear was in place and doesn't look torn up at all! I'm going to look more at the fitment of the speedo gears. anyone have an idea why this thing is doing this to me?
Last edited by chevyracingrox; Jan 1, 2009 at 05:31 PM.
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