Go Back   The Supercar Registry > General Discussion > Technical & Restoration


Reply
 
Thread Tools Display Modes
  #1  
Old 07-23-2012, 11:25 PM
69 Post Sedan's Avatar
69 Post Sedan 69 Post Sedan is offline
Yenko Contributing Member
 
Join Date: Dec 2007
Location: Janesville, WI
Posts: 3,577
Thanks: 1,063
Thanked 497 Times in 177 Posts
Default Speedometer Gear Reducer

I changed the gears in the Chevelle from 3.73 to 4.56 with 28" tall tires. I need a speedometer gear reducer. The drive gear has 8 teeth and the driven gear has 21 teeth.

Does anyone know how to figure out which one I need or have a part number. The little research I have done says I need one that's has a 20% reduction? [img]<<GRAEMLIN_URL>>/dunno.gif[/img]

Thanks, Kurt
__________________

1969 SS396 Post Sedan Delivered to Van-T Topeka KS
MCACN Day2 Concourse Gold Award

1965 VW El Lobo Dune Buggy built in the mid 70’s for the Iowa Shriners

1968 Schwinn Orange Krate
1969 Schwinn Pea Picker
1968 Schwinn 5-Speed
1970 Schwinn 3-Speed Deluxe
1972 Schwinn 10-Speed Continental
1973 Schwinn 5-Speed Suburban
All Original Paint Bikes
Reply With Quote
Click here to view all the pictures posted in this thread...
  #2  
Old 07-24-2012, 12:01 AM
Postsedan Postsedan is offline
Senior Member
 
Join Date: Aug 2003
Location: Chicago Suburbs
Posts: 12,342
Thanks: 6
Thanked 998 Times in 622 Posts
Default Re: Speedometer Gear Reducer

Did you call Crash?

Dan
__________________
69 300 Deluxe Post Sedan Frost Green
69 SS396 300 Deluxe Post Sedan Lemans Blue SOLD
70 Buick Skylark Post Sedan Gulfstream Blue
70 Buick Skylark Post Sedan Burnished Saddle

http://m.youtube.com/watch?v=PM3DE8qI2NY

https://m.youtube.com/watch?v=Yn4xEmGypUw
Reply With Quote
  #3  
Old 07-24-2012, 12:53 AM
69 Post Sedan's Avatar
69 Post Sedan 69 Post Sedan is offline
Yenko Contributing Member
 
Join Date: Dec 2007
Location: Janesville, WI
Posts: 3,577
Thanks: 1,063
Thanked 497 Times in 177 Posts
Default Re: Speedometer Gear Reducer

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Postsedan</div><div class="ubbcode-body">Did you call Crash?

Dan </div></div>

Not yet but the guy who built my trans was really close as I need about a 20% reducer. After sitting on the computer for this whole time, I know GM has a .8241 (3950352) which would get me to 2.707 and I'm currently at 2.65.

I'll keep searching or buy a aftermarket one and change the driven gear on the trans if needed.

And I'm NOT going to pay $236.55 for one!

.8241 Adapter on eBay

Kurt
__________________

1969 SS396 Post Sedan Delivered to Van-T Topeka KS
MCACN Day2 Concourse Gold Award

1965 VW El Lobo Dune Buggy built in the mid 70’s for the Iowa Shriners

1968 Schwinn Orange Krate
1969 Schwinn Pea Picker
1968 Schwinn 5-Speed
1970 Schwinn 3-Speed Deluxe
1972 Schwinn 10-Speed Continental
1973 Schwinn 5-Speed Suburban
All Original Paint Bikes
Reply With Quote
  #4  
Old 07-24-2012, 01:12 AM
Postsedan Postsedan is offline
Senior Member
 
Join Date: Aug 2003
Location: Chicago Suburbs
Posts: 12,342
Thanks: 6
Thanked 998 Times in 622 Posts
Default Re: Speedometer Gear Reducer

I bet Crash has it, and at a fair price [img]<<GRAEMLIN_URL>>/biggthumpup.gif[/img]

Dan
__________________
69 300 Deluxe Post Sedan Frost Green
69 SS396 300 Deluxe Post Sedan Lemans Blue SOLD
70 Buick Skylark Post Sedan Gulfstream Blue
70 Buick Skylark Post Sedan Burnished Saddle

http://m.youtube.com/watch?v=PM3DE8qI2NY

https://m.youtube.com/watch?v=Yn4xEmGypUw
Reply With Quote
  #5  
Old 07-24-2012, 01:54 AM
69 Post Sedan's Avatar
69 Post Sedan 69 Post Sedan is offline
Yenko Contributing Member
 
Join Date: Dec 2007
Location: Janesville, WI
Posts: 3,577
Thanks: 1,063
Thanked 497 Times in 177 Posts
Default Re: Speedometer Gear Reducer

I found a .800 reducer on GM Parts Direct but I think the shipping is a bit much. [img]<<GRAEMLIN_URL>>/shocked.gif[/img]

$411.54 shipping?????

Kurt
__________________

1969 SS396 Post Sedan Delivered to Van-T Topeka KS
MCACN Day2 Concourse Gold Award

1965 VW El Lobo Dune Buggy built in the mid 70’s for the Iowa Shriners

1968 Schwinn Orange Krate
1969 Schwinn Pea Picker
1968 Schwinn 5-Speed
1970 Schwinn 3-Speed Deluxe
1972 Schwinn 10-Speed Continental
1973 Schwinn 5-Speed Suburban
All Original Paint Bikes
Reply With Quote
  #6  
Old 07-24-2012, 02:28 AM
crash crash is offline
Senior Member
 
Join Date: Apr 2002
Location: Kenosha, Wi.
Posts: 727
Thanks: 0
Thanked 75 Times in 25 Posts
Default Re: Speedometer Gear Reducer

Kurt, I have several in stock, tell which one do you need...

.7333
.8000
.8241
.8653
.9444
.9743
1.0888
1.1111
1.2020
1.3000

Give me a call... Crash

[email protected]
Reply With Quote
  #7  
Old 07-24-2012, 09:19 AM
Postsedan Postsedan is offline
Senior Member
 
Join Date: Aug 2003
Location: Chicago Suburbs
Posts: 12,342
Thanks: 6
Thanked 998 Times in 622 Posts
Default Re: Speedometer Gear Reducer

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Postsedan</div><div class="ubbcode-body">I bet Crash has it, and at a fair price [img]<<GRAEMLIN_URL>>/biggthumpup.gif[/img]

Dan </div></div>

I guess I`m a broken record [img]<<GRAEMLIN_URL>>/hmmm.gif[/img]

Dan
__________________
69 300 Deluxe Post Sedan Frost Green
69 SS396 300 Deluxe Post Sedan Lemans Blue SOLD
70 Buick Skylark Post Sedan Gulfstream Blue
70 Buick Skylark Post Sedan Burnished Saddle

http://m.youtube.com/watch?v=PM3DE8qI2NY

https://m.youtube.com/watch?v=Yn4xEmGypUw
Reply With Quote
  #8  
Old 07-24-2012, 01:42 PM
396L35's Avatar
396L35 396L35 is offline
Senior Member
 
Join Date: Jan 2003
Location: Herculaneum, MO
Posts: 1,807
Thanks: 0
Thanked 2 Times in 2 Posts
Default Re: Speedometer Gear Reducer

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Postsedan</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Postsedan</div><div class="ubbcode-body">I bet Crash has it, and at a fair price [img]<<GRAEMLIN_URL>>/biggthumpup.gif[/img]

Dan </div></div>

I guess I`m a broken record [img]<<GRAEMLIN_URL>>/hmmm.gif[/img]

Dan </div></div>

Well Dan I was going to save it until this weekend but since you figured it out on your own I will save my breath... [img]<<GRAEMLIN_URL>>/beers.gif[/img]
__________________
Mark
Reply With Quote
  #9  
Old 07-24-2012, 10:03 PM
Postsedan Postsedan is offline
Senior Member
 
Join Date: Aug 2003
Location: Chicago Suburbs
Posts: 12,342
Thanks: 6
Thanked 998 Times in 622 Posts
Default Re: Speedometer Gear Reducer

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: 396L35</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Postsedan</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Postsedan</div><div class="ubbcode-body">I bet Crash has it, and at a fair price [img]<<GRAEMLIN_URL>>/biggthumpup.gif[/img]

Dan </div></div>

I guess I`m a broken record [img]<<GRAEMLIN_URL>>/hmmm.gif[/img]

Dan </div></div>

Well Dan I was going to save it until this weekend but since you figured it out on your own I will save my breath... [img]<<GRAEMLIN_URL>>/beers.gif[/img] </div></div>

Looking forward to seeing you soon.

Dan
__________________
69 300 Deluxe Post Sedan Frost Green
69 SS396 300 Deluxe Post Sedan Lemans Blue SOLD
70 Buick Skylark Post Sedan Gulfstream Blue
70 Buick Skylark Post Sedan Burnished Saddle

http://m.youtube.com/watch?v=PM3DE8qI2NY

https://m.youtube.com/watch?v=Yn4xEmGypUw
Reply With Quote
  #10  
Old 07-24-2012, 11:45 PM
TexasNova's Avatar
TexasNova TexasNova is offline
Junior Member
 
Join Date: Jul 2012
Location: Wichita Fall, Tx
Posts: 19
Thanks: 0
Thanked 0 Times in 0 Posts
Default Re: Speedometer Gear Reducer

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: crash</div><div class="ubbcode-body">Kurt, I have several in stock, tell which one do you need...

.7333
.8000
.8241
.8653
.9444
.9743
1.0888
1.1111
1.2020
1.3000

Give me a call... Crash

[email protected] </div></div>
Hey crash how do you figure what new speedo gears you need when you change tranny, rear gear, and tires? I know there is a formula but how to you apply it to the gears to recalibrate the speedometer?
__________________
Bob
If I can't smoke the tires, I want more!

76 Nova
07 Chevy Silverado
05 Yamaha VStar 1100
Reply With Quote
Reply


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT. The time now is 05:17 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2025, vBulletin Solutions Inc.

O Garage vBulletin Plugins by Drive Thru Online, Inc.