TampaRiv Posted December 7, 2020 Share Posted December 7, 2020 Hello again Gents, I need some more speedo advice. My speedo was working well after I recomissioned the car, but after a couple of months it stopped working. Long story short, I have removed and tested the speedometer head in the dash, and it seems to work just fine; today I removed the speedometer cable, and while it's old and gnarly, it actually turns OK. It's 50" long. So, after visiting this topic a time or two, remind me about the nylon drive gear in the tranny, which I now assume to be the problem. I recall that the gears vary with respect to the type of differential, so how do you know which gear is correct? I've heard tell that there are numbers on the differential, but I just could not see any numbers, and my car is clean underneath. SO... how do I figure out which gear I need, and where do I buy that gear? Rich Link to comment Share on other sites More sharing options...
1965rivgs Posted December 7, 2020 Share Posted December 7, 2020 6 minutes ago, TampaRiv said: Hello again Gents, I need some more speedo advice. My speedo was working well after I recomissioned the car, but after a couple of months it stopped working. Long story short, I have removed and tested the speedometer head in the dash, and it seems to work just fine; today I removed the speedometer cable, and while it's old and gnarly, it actually turns OK. It's 50" long. So, after visiting this topic a time or two, remind me about the nylon drive gear in the tranny, which I now assume to be the problem. I recall that the gears vary with respect to the type of differential, so how do you know which gear is correct? I've heard tell that there are numbers on the differential, but I just could not see any numbers, and my car is clean underneath. SO... how do I figure out which gear I need, and where do I buy that gear? Rich If your speedo was accurate pull the old gear, It should be a specific color or you can count the teeth...should probably do both. You have to pull the old gear anyway to inspect it. Tom 1 Link to comment Share on other sites More sharing options...
TampaRiv Posted December 7, 2020 Author Share Posted December 7, 2020 Thanks Tom, that makes perfect sense. Question: will the transmission leak fluid with the cable removed? I need to take the car to a shop to have them remove the gear...I just can't reach it. Link to comment Share on other sites More sharing options...
1965rivgs Posted December 7, 2020 Share Posted December 7, 2020 1 hour ago, TampaRiv said: Thanks Tom, that makes perfect sense. Question: will the transmission leak fluid with the cable removed? I need to take the car to a shop to have them remove the gear...I just can't reach it. It may leak some but I doubt too much...but I guess it matters how far you need to go. Honestly, thats only an educated guess, because I never ran one for any appreciable distance without a speedo cable. The adapter which conceals the driven gear is very easy to remove. If my memory serves me well its one bolt and it pulls right out. Tom Link to comment Share on other sites More sharing options...
Zimm63 Posted December 7, 2020 Share Posted December 7, 2020 One bolt is correct, but make sure you see the little clip that holds the gear housing in the case. It can run off and hide. Link to comment Share on other sites More sharing options...
TampaRiv Posted December 7, 2020 Author Share Posted December 7, 2020 Well, sure, if I were still 35 years old, I'd slither under that car and pull that gear right out of there. Now at 62, not so much! My neck is still recovering from the headliner installation 18 months ago! I'll just pay the guy with the lift to remove the gear for me. I do plenty of other stuff.😌 Link to comment Share on other sites More sharing options...
1965rivgs Posted December 7, 2020 Share Posted December 7, 2020 34 minutes ago, TampaRiv said: Well, sure, if I were still 35 years old, I'd slither under that car and pull that gear right out of there. Now at 62, not so much! My neck is still recovering from the headliner installation 18 months ago! I'll just pay the guy with the lift to remove the gear for me. I do plenty of other stuff.😌 You`re still a young man! Tom Link to comment Share on other sites More sharing options...
telriv Posted December 8, 2020 Share Posted December 8, 2020 I'm 74 & can & still do it. Now that I don't have a shop anymore it's jacks, jack stands, drive-up ramps or anything else that's required. Last year I changed the P/S pump on a '65GS in the parking lot. Took all of 20 minutes. Age is just an excuse. The more you move the better off you'll be/feel. Tom T. 1 Link to comment Share on other sites More sharing options...
Turbinator Posted December 30, 2020 Share Posted December 30, 2020 On 12/7/2020 at 9:45 PM, telriv said: Age is just an excuse. Tom, could be. Some of us got some heavier bumps along the way. I know you can do it. As your helper you worked the daylights out of me! Turhinator 1 Link to comment Share on other sites More sharing options...
telriv Posted December 30, 2020 Share Posted December 30, 2020 Sorry to be so hard on you Bob. 1 Link to comment Share on other sites More sharing options...
DrownedRiv Posted December 31, 2020 Share Posted December 31, 2020 On 12/7/2020 at 9:45 PM, telriv said: I'm 74 & can & still do it. Now that I don't have a shop anymore it's jacks, jack stands, drive-up ramps or anything else that's required. Last year I changed the P/S pump on a '65GS in the parking lot. Took all of 20 minutes. Age is just an excuse. The more you move the better off you'll be/feel. Tom T. God Bless you! Link to comment Share on other sites More sharing options...
Hans3 Posted December 31, 2020 Share Posted December 31, 2020 Can a worn gear interface in a Speedostat factory cruise control (if equipped) trigger the same speedo calibration issues as a worn tranny drive? Link to comment Share on other sites More sharing options...
Turbinator Posted January 4, 2021 Share Posted January 4, 2021 On 12/30/2020 at 1:38 PM, telriv said: Sorry to be so hard on you Bob. Tom, let me correct myself. You didn’t put me under stress it was the work! You rascal you can set the pace for anyone. Link to comment Share on other sites More sharing options...
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