Holden Diff Ratio resource thread

V8Owner · Forum Owner

Here are the Calculations of diff ratios on a Holden T56 & 4l6065

T56 Gear Box – Manual 6 speed
Ratio : 3.46:1 FD
Tyre:- 235/45 x 17

Top Gear gives 69.017 KPH/1000 RPM and a top speed of 427.908 KPH at 6200 RPM

Engine speeds in top gear:-
40 KPH = 580 RPM
50 KPH = 724 KPH
60 KPH = 869 RPM
80 KPH = 1159 RPM
100 KPH = 1449 RPM
110 KPH = 1594 RPM
130 KPH = 1884 RPM
160 KPH = 2318 RPM

Top Speed in 1 gear = 80.434 KPH
changes into 2 gear at 4149 RPM dropping 2051 RPM
Top Speed in 2 gear = 120.199 KPH
changes into 3 gear at 4528 RPM dropping 1672 RPM
Top Speed in 3 gear = 164.580 KPH
changes into 4 gear at 4769 RPM dropping 1431 RPM
Top Speed in 4 gear = 213.954 KPH
changes into 5 gear at 4588 RPM dropping 1612 RPM
Top Speed in 5 gear = 289.127 KPH
changes into 6 gear at 4189 RPM dropping 2011 RPM
Top Speed in 6 gear = 427.908 KPH

************************************************

T56 Gear Box – Manual 6 speed
Ratio : 3.73:1 FD
Tyre:- 235/45 x 17
Top Gear gives 64.021 KPH/1000 RPM and a top speed of 396.933 KPH at 6200 RPM

Engine speeds in top gear:-
40 KPH = 625 RPM
50 KPH = 781 KPH
60 KPH = 937 RPM
80 KPH = 1250 RPM
100 KPH = 1562 RPM
110 KPH = 1718 RPM
130 KPH = 2031 RPM
160 KPH = 2499 RPM

Top Speed in 1 gear = 74.611 KPH
changes into 2 gear at 4149 RPM dropping 2051 RPM
Top Speed in 2 gear = 111.498 KPH
changes into 3 gear at 4528 RPM dropping 1672 RPM
Top Speed in 3 gear = 152.667 KPH
changes into 4 gear at 4769 RPM dropping 1431 RPM
Top Speed in 4 gear = 198.466 KPH
changes into 5 gear at 4588 RPM dropping 1612 RPM
Top Speed in 5 gear = 268.198 KPH
changes into 6 gear at 4189 RPM dropping 2011 RPM
Top Speed in 6 gear = 396.933 KPH

**************************************************

T56 Gear Box – Manual 6 speed
Ratio : 3.91:1 FD
Tyre:- 235/45 x 17
Top Gear gives 61.074 KPH/1000 RPM and a top speed of 378.660 KPH at 6200 RPM

Engine speeds in top gear:-
40 KPH = 655 RPM
50 KPH = 819 KPH
60 KPH = 982 RPM
80 KPH = 1310 RPM
100 KPH = 1637 RPM
110 KPH = 1801 RPM
130 KPH = 2129 RPM
160 KPH = 2620 RPM

Top Speed in 1 gear = 71.177 KPH
changes into 2 gear at 4149 RPM dropping 2051 RPM
Top Speed in 2 gear = 106.365 KPH
changes into 3 gear at 4528 RPM dropping 1672 RPM
Top Speed in 3 gear = 145.638 KPH
changes into 4 gear at 4769 RPM dropping 1431 RPM
Top Speed in 4 gear = 189.330 KPH
changes into 5 gear at 4588 RPM dropping 1612 RPM
Top Speed in 5 gear = 255.851 KPH
changes into 6 gear at 4189 RPM dropping 2011 RPM
Top Speed in 6 gear = 378.660 KPH

************************************************** *

T56 Gear Box – Manual 6 speed
Ratio : 4.11:1 FD
Tyre:- 235/45 x 17
Top Gear gives 58.102 KPH/1000 RPM and a top speed of 360.234 KPH at 6200 RPM

Engine speeds in top gear:-
40 KPH = 688 RPM
50 KPH = 861 KPH
60 KPH = 1033 RPM
80 KPH = 1377 RPM
100 KPH = 1721 RPM
110 KPH = 1893 RPM
130 KPH = 2237 RPM
160 KPH = 2754 RPM

Top Speed in 1 gear = 67.713 KPH
changes into 2 gear at 4149 RPM dropping 2051 RPM
Top Speed in 2 gear = 101.189 KPH
changes into 3 gear at 4528 RPM dropping 1672 RPM
Top Speed in 3 gear = 138.551 KPH
changes into 4 gear at 4769 RPM dropping 1431 RPM
Top Speed in 4 gear = 180.117 KPH
changes into 5 gear at 4588 RPM dropping 1612 RPM
Top Speed in 5 gear = 243.401 KPH
changes into 6 gear at 4189 RPM dropping 2011 RPM
Top Speed in 6 gear = 360.234 KPH

***********************************************

Gearbox:- 4L60/65 Automatic 4 speed
Ratio : 3.07 FD
Tyre:- 235/45 x 17
Top Gear gives 55.880 KPH/1000 RPM and a top speed of 346.456 KPH at 6200 RPM

Engine speeds in top gear:-
40 KPH = 716 RPM
50 KPH = 895 KPH
60 KPH = 1074 RPM
80 KPH = 1432 RPM
100 KPH = 1790 RPM
110 KPH = 1969 RPM
130 KPH = 2326 RPM
160 KPH = 2863 RPM

Top Speed in 1 gear = 78.802 KPH
changes into 2 gear at 3292 RPM dropping 2908 RPM
Top Speed in 2 gear = 148.390 KPH
changes into 3 gear at 3815 RPM dropping 2385 RPM
Top Speed in 3 gear = 241.134 KPH
changes into 4 gear at 4315 RPM dropping 1885 RPM
Top Speed in 4 gear = 346.456 KPH

***********************************************

Gearbox:- 4L60/65 Automatic 4 speed
Ratio : 3.46 FD
Tyre:- 235/45 x 17
Top Gear gives 49.581 KPH/1000 RPM and a top speed of 307.405 KPH at 6200 RPM

Engine speeds in top gear:-
40 KPH = 807 RPM
50 KPH = 1008 KPH
60 KPH = 1210 RPM
80 KPH = 1614 RPM
100 KPH = 2017 RPM
110 KPH = 2219 RPM
130 KPH = 2622 RPM
160 KPH = 3227 RPM

Top Speed in 1 gear = 69.920 KPH
changes into 2 gear at 3292 RPM dropping 2908 RPM
Top Speed in 2 gear = 131.664 KPH
changes into 3 gear at 3815 RPM dropping 2385 RPM
Top Speed in 3 gear = 213.954 KPH
changes into 4 gear at 4315 RPM dropping 1885 RPM
Top Speed in 4 gear = 307.405 KPH

***********************************************

Gearbox:- 4L60/65 Automatic 4 speed
Ratio : 3.73 FD
Tyre:- 235/45 x 17
Top Gear gives 45.992 KPH/1000 RPM and a top speed of 285.153 KPH at 6200 RPM

Engine speeds in top gear:-
40 KPH = 870 RPM
50 KPH = 1087 KPH
60 KPH = 1305 RPM
80 KPH = 1739 RPM
100 KPH = 2174 RPM
110 KPH = 2392 RPM
130 KPH = 2827 RPM
160 KPH = 3479 RPM

Top Speed in 1 gear = 64.858 KPH
changes into 2 gear at 3292 RPM dropping 2908 RPM
Top Speed in 2 gear = 122.133 KPH
changes into 3 gear at 3815 RPM dropping 2385 RPM
Top Speed in 3 gear = 198.466 KPH
changes into 4 gear at 4315 RPM dropping 1885 RPM
Top Speed in 4 gear = 285.153 KPH

***********************************************

Gearbox:- 4L60/65 Automatic 4 speed
Ratio : 3.91 FD
Tyre:- 235/45 x 17
Top Gear gives 43.875 KPH/1000 RPM and a top speed of 272.026 KPH at 6200 RPM

Engine speeds in top gear:-
40 KPH = 912 RPM
50 KPH = 1140 KPH
60 KPH = 1368 RPM
80 KPH = 1823 RPM
100 KPH = 2279 RPM
110 KPH = 2507 RPM
130 KPH = 2963 RPM
160 KPH = 3647 RPM

Top Speed in 1 gear = 61.873 KPH
changes into 2 gear at 3292 RPM dropping 2908 RPM
Top Speed in 2 gear = 116.511 KPH
changes into 3 gear at 3815 RPM dropping 2385 RPM
Top Speed in 3 gear = 189.330 KPH
changes into 4 gear at 4315 RPM dropping 1885 RPM
Top Speed in 4 gear = 272.026 KPH

**********************************************

Gearbox:- 4L60/65 Automatic 4 speed
Ratio : 4.11
Tyre:- 235/45 x 17
Top Gear gives 41.502 KPH/1000 RPM and a top speed of 257.310 KPH at 6200 RPM

Engine speeds in top gear:-
40 KPH = 964rpm
50 KPH = 1205rpm
60 KPH = 1446rpm
80 KPH = 1928rpm
100 KPH = 2410rpm
110 KPH = 2651rpm
130 KPH = 3132rpm
160 KPH = 3855 RPM

Top Speed in 1 gear = 58.862 KPH
changes into 2 gear at 3282 RPM dropping 2918 RPM
Top Speed in 2 gear = 111.183 KPH
changes into 3 gear at 3827 RPM dropping 2373 RPM
Top Speed in 3 gear = 180.117 KPH
changes into 4 gear at 4340 RPM dropping 1860 RPM
Top Speed in 4 gear = 257.310 KPH

[Information supplied by SID447]

JBTHEONE · Validated Member

Is ther a table for the ones that have 18' fitted as standard? I am keen to seen how 3.9 gears would affect my rpm/speed as shown b4.

jb
m6 b4 you ask

chops · Validated Member

What tyre size are you using?
235 40 R18 should have a similar rolling circumference to the tyre posted.

Other tyres will need to be calculated separately.

V8Owner · Forum Owner

I am looking into this resource and should have something for you very shortly.

V8Owner · Forum Owner

Here is a neat little application you can use to work out all those ratios/speed/rpm questions.

Download it here

Cheers,

Peter

[1] Posted by V8Owner 28-05-2004, 11:21 AM	Forum Owner
Holden Diff Ratio resource thread Here are the Calculations of diff ratios on a Holden T56 & 4l6065 T56 Gear Box – Manual 6 speed Ratio : 3.46:1 FD Tyre:- 235/45 x 17 Top Gear gives 69.017 KPH/1000 RPM and a top speed of 427.908 KPH at 6200 RPM Engine speeds in top gear:- 40 KPH = 580 RPM 50 KPH = 724 KPH 60 KPH = 869 RPM 80 KPH = 1159 RPM 100 KPH = 1449 RPM 110 KPH = 1594 RPM 130 KPH = 1884 RPM 160 KPH = 2318 RPM Top Speed in 1 gear = 80.434 KPH changes into 2 gear at 4149 RPM dropping 2051 RPM Top Speed in 2 gear = 120.199 KPH changes into 3 gear at 4528 RPM dropping 1672 RPM Top Speed in 3 gear = 164.580 KPH changes into 4 gear at 4769 RPM dropping 1431 RPM Top Speed in 4 gear = 213.954 KPH changes into 5 gear at 4588 RPM dropping 1612 RPM Top Speed in 5 gear = 289.127 KPH changes into 6 gear at 4189 RPM dropping 2011 RPM Top Speed in 6 gear = 427.908 KPH ********************************************** T56 Gear Box – Manual 6 speed Ratio : 3.73:1 FD Tyre:- 235/45 x 17 Top Gear gives 64.021 KPH/1000 RPM and a top speed of 396.933 KPH at 6200 RPM Engine speeds in top gear:- 40 KPH = 625 RPM 50 KPH = 781 KPH 60 KPH = 937 RPM 80 KPH = 1250 RPM 100 KPH = 1562 RPM 110 KPH = 1718 RPM 130 KPH = 2031 RPM 160 KPH = 2499 RPM Top Speed in 1 gear = 74.611 KPH changes into 2 gear at 4149 RPM dropping 2051 RPM Top Speed in 2 gear = 111.498 KPH changes into 3 gear at 4528 RPM dropping 1672 RPM Top Speed in 3 gear = 152.667 KPH changes into 4 gear at 4769 RPM dropping 1431 RPM Top Speed in 4 gear = 198.466 KPH changes into 5 gear at 4588 RPM dropping 1612 RPM Top Speed in 5 gear = 268.198 KPH changes into 6 gear at 4189 RPM dropping 2011 RPM Top Speed in 6 gear = 396.933 KPH ********************************************** T56 Gear Box – Manual 6 speed Ratio : 3.91:1 FD Tyre:- 235/45 x 17 Top Gear gives 61.074 KPH/1000 RPM and a top speed of 378.660 KPH at 6200 RPM Engine speeds in top gear:- 40 KPH = 655 RPM 50 KPH = 819 KPH 60 KPH = 982 RPM 80 KPH = 1310 RPM 100 KPH = 1637 RPM 110 KPH = 1801 RPM 130 KPH = 2129 RPM 160 KPH = 2620 RPM Top Speed in 1 gear = 71.177 KPH changes into 2 gear at 4149 RPM dropping 2051 RPM Top Speed in 2 gear = 106.365 KPH changes into 3 gear at 4528 RPM dropping 1672 RPM Top Speed in 3 gear = 145.638 KPH changes into 4 gear at 4769 RPM dropping 1431 RPM Top Speed in 4 gear = 189.330 KPH changes into 5 gear at 4588 RPM dropping 1612 RPM Top Speed in 5 gear = 255.851 KPH changes into 6 gear at 4189 RPM dropping 2011 RPM Top Speed in 6 gear = 378.660 KPH ************************************************ * T56 Gear Box – Manual 6 speed Ratio : 4.11:1 FD Tyre:- 235/45 x 17 Top Gear gives 58.102 KPH/1000 RPM and a top speed of 360.234 KPH at 6200 RPM Engine speeds in top gear:- 40 KPH = 688 RPM 50 KPH = 861 KPH 60 KPH = 1033 RPM 80 KPH = 1377 RPM 100 KPH = 1721 RPM 110 KPH = 1893 RPM 130 KPH = 2237 RPM 160 KPH = 2754 RPM Top Speed in 1 gear = 67.713 KPH changes into 2 gear at 4149 RPM dropping 2051 RPM Top Speed in 2 gear = 101.189 KPH changes into 3 gear at 4528 RPM dropping 1672 RPM Top Speed in 3 gear = 138.551 KPH changes into 4 gear at 4769 RPM dropping 1431 RPM Top Speed in 4 gear = 180.117 KPH changes into 5 gear at 4588 RPM dropping 1612 RPM Top Speed in 5 gear = 243.401 KPH changes into 6 gear at 4189 RPM dropping 2011 RPM Top Speed in 6 gear = 360.234 KPH ********************************************* Gearbox:- 4L60/65 Automatic 4 speed Ratio : 3.07 FD Tyre:- 235/45 x 17 Top Gear gives 55.880 KPH/1000 RPM and a top speed of 346.456 KPH at 6200 RPM Engine speeds in top gear:- 40 KPH = 716 RPM 50 KPH = 895 KPH 60 KPH = 1074 RPM 80 KPH = 1432 RPM 100 KPH = 1790 RPM 110 KPH = 1969 RPM 130 KPH = 2326 RPM 160 KPH = 2863 RPM Top Speed in 1 gear = 78.802 KPH changes into 2 gear at 3292 RPM dropping 2908 RPM Top Speed in 2 gear = 148.390 KPH changes into 3 gear at 3815 RPM dropping 2385 RPM Top Speed in 3 gear = 241.134 KPH changes into 4 gear at 4315 RPM dropping 1885 RPM Top Speed in 4 gear = 346.456 KPH ******************************************* Gearbox:- 4L60/65 Automatic 4 speed Ratio : 3.46 FD Tyre:- 235/45 x 17 Top Gear gives 49.581 KPH/1000 RPM and a top speed of 307.405 KPH at 6200 RPM Engine speeds in top gear:- 40 KPH = 807 RPM 50 KPH = 1008 KPH 60 KPH = 1210 RPM 80 KPH = 1614 RPM 100 KPH = 2017 RPM 110 KPH = 2219 RPM 130 KPH = 2622 RPM 160 KPH = 3227 RPM Top Speed in 1 gear = 69.920 KPH changes into 2 gear at 3292 RPM dropping 2908 RPM Top Speed in 2 gear = 131.664 KPH changes into 3 gear at 3815 RPM dropping 2385 RPM Top Speed in 3 gear = 213.954 KPH changes into 4 gear at 4315 RPM dropping 1885 RPM Top Speed in 4 gear = 307.405 KPH ******************************************* Gearbox:- 4L60/65 Automatic 4 speed Ratio : 3.73 FD Tyre:- 235/45 x 17 Top Gear gives 45.992 KPH/1000 RPM and a top speed of 285.153 KPH at 6200 RPM Engine speeds in top gear:- 40 KPH = 870 RPM 50 KPH = 1087 KPH 60 KPH = 1305 RPM 80 KPH = 1739 RPM 100 KPH = 2174 RPM 110 KPH = 2392 RPM 130 KPH = 2827 RPM 160 KPH = 3479 RPM Top Speed in 1 gear = 64.858 KPH changes into 2 gear at 3292 RPM dropping 2908 RPM Top Speed in 2 gear = 122.133 KPH changes into 3 gear at 3815 RPM dropping 2385 RPM Top Speed in 3 gear = 198.466 KPH changes into 4 gear at 4315 RPM dropping 1885 RPM Top Speed in 4 gear = 285.153 KPH ******************************************* Gearbox:- 4L60/65 Automatic 4 speed Ratio : 3.91 FD Tyre:- 235/45 x 17 Top Gear gives 43.875 KPH/1000 RPM and a top speed of 272.026 KPH at 6200 RPM Engine speeds in top gear:- 40 KPH = 912 RPM 50 KPH = 1140 KPH 60 KPH = 1368 RPM 80 KPH = 1823 RPM 100 KPH = 2279 RPM 110 KPH = 2507 RPM 130 KPH = 2963 RPM 160 KPH = 3647 RPM Top Speed in 1 gear = 61.873 KPH changes into 2 gear at 3292 RPM dropping 2908 RPM Top Speed in 2 gear = 116.511 KPH changes into 3 gear at 3815 RPM dropping 2385 RPM Top Speed in 3 gear = 189.330 KPH changes into 4 gear at 4315 RPM dropping 1885 RPM Top Speed in 4 gear = 272.026 KPH ****************************************** Gearbox:- 4L60/65 Automatic 4 speed Ratio : 4.11 Tyre:- 235/45 x 17 Top Gear gives 41.502 KPH/1000 RPM and a top speed of 257.310 KPH at 6200 RPM Engine speeds in top gear:- 40 KPH = 964rpm 50 KPH = 1205rpm 60 KPH = 1446rpm 80 KPH = 1928rpm 100 KPH = 2410rpm 110 KPH = 2651rpm 130 KPH = 3132rpm 160 KPH = 3855 RPM Top Speed in 1 gear = 58.862 KPH changes into 2 gear at 3282 RPM dropping 2918 RPM Top Speed in 2 gear = 111.183 KPH changes into 3 gear at 3827 RPM dropping 2373 RPM Top Speed in 3 gear = 180.117 KPH changes into 4 gear at 4340 RPM dropping 1860 RPM Top Speed in 4 gear = 257.310 KPH [Information supplied by SID447] __________________ Street racing is not Drag racing** "We can't solve problems by using the same kind of thinking we used when we created them." [Albert Einstein]	Join Date: May 2004 Location: Sydney Posts: 2,766 Time spent on V8O: 2 month 3 week 3 day
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[2] Posted by JBTHEONE 10-12-2004, 09:06 AM	Validated Member
larger whel correction Is ther a table for the ones that have 18' fitted as standard? I am keen to seen how 3.9 gears would affect my rpm/speed as shown b4. jb m6 b4 you ask	Join Date: Nov 2004 Location: IN OZ Posts: 485 Time spent on V8O: 7 h 29 min 18 sec
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[3] Posted by chops 10-12-2004, 11:58 AM	Validated Member
What tyre size are you using? 235 40 R18 should have a similar rolling circumference to the tyre posted. Other tyres will need to be calculated separately.	Join Date: Jun 2004 Location: Adelaide, SA Posts: 312 Time spent on V8O: 8 h 2 min 14 sec
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[4] Posted by V8Owner 10-12-2004, 01:44 PM	Forum Owner
I am looking into this resource and should have something for you very shortly. __________________ Street racing is not Drag racing "We can't solve problems by using the same kind of thinking we used when we created them." [Albert Einstein]	Join Date: May 2004 Location: Sydney Posts: 2,766 Time spent on V8O: 2 month 3 week 3 day
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[5] Posted by V8Owner 10-12-2004, 11:25 PM	Forum Owner
Here is a neat little application you can use to work out all those ratios/speed/rpm questions. Download it here Cheers, Peter __________________ Street racing is not Drag racing "We can't solve problems by using the same kind of thinking we used when we created them." [Albert Einstein]	Join Date: May 2004 Location: Sydney Posts: 2,766 Time spent on V8O: 2 month 3 week 3 day
Profile \| Website \| Search \|	Reply

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