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Re: My 59 3100 and T5 Swap
Moonlight #1412675 Fri Jun 04 2021 07:40 PM
Joined: Sep 2011
Posts: 2,175
L
'Bolter
Wait!
Look inside the tranny tail housing at the DRIVE gear. Is it RED or BLUE?

Re: My 59 3100 and T5 Swap
Moonlight #1412872 Sun Jun 06 2021 05:08 PM
Joined: Dec 2014
Posts: 60
M
'Bolter
Survey says ... Red.

My tires are 235/75R-15, an eyeball measurement is give or take 29” in diameter, 3:90 rear gears as previously mentioned.
I’m not quite following your page on this topic Lugnutz, to get an accurate speedo and odometer readings do I swap out the driven gear that came with my T5 for a blue (22 teeth?) version?

Thanks for your help.

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'59 Apache
‘21 Beta 390RS
‘18 BMW R1200RT
'12 Ford Flex
'13 Aprilia Tuono
‘11 Ducati Hypermotard
Salisbury, MD
Re: My 59 3100 and T5 Swap
Moonlight #1413145 Tue Jun 08 2021 06:01 PM
Joined: Sep 2011
Posts: 2,175
L
'Bolter
Yes, your tire diameter is 28.9”.
I use THIS TIRE SIZE CALCULATOR [tiresize.com] which makes it simple to plan ahead.

To pick the correct DRIVE gear and DRIVEN gear combination, I use THIS CALCULATOR. [tciauto.com]. Part way down that page is the SPEEDOMETER GEAR CALCULATOR section. A Chevy T5 can use a blue 7 tooth or a red 9 tooth DRIVE gear.
Since DRIVEN gears only come with limited choices of tooth count, you might need to use a blue 7 tooth DRIVE gear in order to find a matching DRIVEN gear.

Example:
Your current red 9 tooth DRIVE gear with a 3.90 axle and 28.9” tire will require a 24.47 tooth DRIVEN gear. (So either a 24 or 25 tooth.) Unfortunately, there is no DRIVEN gear available for a T5 with that tooth count. Top tooth count is 23 teeth.

Recalculate using a blue 7 tooth DRIVE gear. Result is 19 teeth for the DRIVEN gear, which IS available.

DRIVE gears and DRIVEN gears are available from LA SPEEDOMETER GEAR. [speedometergear.store]

Last edited by Lugnutz; Sat Jun 12 2021 03:15 PM.
Re: My 59 3100 and T5 Swap
Moonlight #1413172 Tue Jun 08 2021 08:03 PM
Joined: Sep 2011
Posts: 912
B
'Bolter
Get a speedo app for your phone. Drive 50 MPH by gps, the dash speedometer reading either + or - X2 will give you the ratio you need , then find a ratio adapter to speed up or slow down the speedo cable by that much.


BC
1960 Chevy C10 driver 235 T5 3.73 dana 44
1949 GMC 250 project in waiting
1960 C60 pasture art
G.M dealer tech since 1980 & counting
Re: My 59 3100 and T5 Swap
Moonlight #1413191 Tue Jun 08 2021 10:15 PM
Joined: Feb 2001
Posts: 6,959
W
'Bolter


Ron, The Computer Greek
I love therefore I am.

1960 MGA Roadster Sold 7/18/2017
1954 3100 Chevy truck in the Gallery
2017 Buick Encore
Pix on Photobucket
Re: My 59 3100 and T5 Swap
BC59 #1413357 Wed Jun 09 2021 11:30 PM
Joined: Sep 2011
Posts: 2,175
L
'Bolter
Originally Posted by BC59
Get a speedo app for your phone. Drive 50 MPH by gps, the dash speedometer reading either + or - X2 will give you the ratio you need , then find a ratio adapter to speed up or slow down the speedo cable by that much.

Interesting solution. So if I drive 50 based on my phone GPS, and my truck speedo says 60 . . . Then I should multiply 60 X 2 and would get 120? Or should I multiply the error of 10mph X 2? That seems more logical since 10 X 2 = 20 and the MPH is 20% off. Then I’d need to order a speedo reduction adapter for 20%.

Last edited by Lugnutz; Fri Jun 11 2021 01:01 AM.
Re: My 59 3100 and T5 Swap
Moonlight #1413486 Fri Jun 11 2021 12:54 AM
Joined: Feb 2001
Posts: 6,959
W
'Bolter
That is how I finally found that the electronic speedo on my 54 was off and the fabulous MPG I was getting was all wrong. In Indiana, the roads are in a grid pattern marked as mile roads. I use those to calibrate the odometer. well, a mile crossroad could only be 8 tenths or 9 so the calibration sequence would be off.


Ron, The Computer Greek
I love therefore I am.

1960 MGA Roadster Sold 7/18/2017
1954 3100 Chevy truck in the Gallery
2017 Buick Encore
Pix on Photobucket
Re: My 59 3100 and T5 Swap
Moonlight #1413605 Sat Jun 12 2021 04:00 AM
Joined: Dec 2014
Posts: 60
M
'Bolter
Lugz, I played with those calculators and see where you are coming from.
But I’m too chicken and lazy to take the tail housing off and change to the 7 tooth drive.
I located a 23 tooth driven gear from www.allstategear.com [allstategear.com], so a little closer to 24.5 than 22. It’s ordered and on it’s way. I’ll try it out and if it bugs me too much maybe I’ll seek out one of those correction boxes.

I think you have a typo in your post where it reads “24.47 tooth Drive gear”, shouldn’t that be “Driven” gear?

Some universal joint measurements indicate my drive shaft has the #1330 joint.
So off to a local driveline shop tomorrow to see if they can source a slip yoke for the T5 and #1330.

Last edited by Moonlight; Sat Jun 12 2021 04:05 AM.

'59 Apache
‘21 Beta 390RS
‘18 BMW R1200RT
'12 Ford Flex
'13 Aprilia Tuono
‘11 Ducati Hypermotard
Salisbury, MD
Re: My 59 3100 and T5 Swap
Moonlight #1413627 Sat Jun 12 2021 03:20 PM
Joined: Sep 2011
Posts: 2,175
L
'Bolter
Moonlight,
Yes, you caught a typo in my prior post. DRIVEN is the correct term. I’ve edited that post.
Nice research. I’ve not found a 23 tooth DRIVEN gear from other vendors.

Your speedo will work fine with a 23 tooth but will be a little inaccurate on the high side. Probably not much to worry about and the % difference will be minimal.

You might need a longer speedo cable. Your drive shaft will need to be shortened by about 3”. I used a worksheet from Denny’s Driveshaft on the internet. Worked perfect and gave my drive shaft shop all the info needed.

Re: My 59 3100 and T5 Swap
Moonlight #1413656 Sat Jun 12 2021 08:14 PM
Joined: Dec 2014
Posts: 60
M
'Bolter
Lugz - My speedo cable will be ok I think. It’s likely not the stock length one, there looks to be plenty of slack to move 6”+ rearward.
Dang! on the drive shaft length. I was hoping I wouldn’t have to mess with that.
I went out and got my tape measure and eyeballed things: existing 3 sp with OD - 21 3/4” to the end of the tail housing. The T5 is 24 1/4”, both measurements from the bell housing face that the trans mates to. That 24 1/4” lands halfway into the 1st part of the u joint. I thought it would be plug and play. Oh well, too much in this to back out now, the plan evolves.


'59 Apache
‘21 Beta 390RS
‘18 BMW R1200RT
'12 Ford Flex
'13 Aprilia Tuono
‘11 Ducati Hypermotard
Salisbury, MD
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