Truck gear/trans ratios-workthread

[zenndog]

I must admit that I have almost no Datsun knowledge

 

I am posting this thread in the hope that we can gather some info that can be searched easily. I will set the goals as follows:

 

1. list all truck rear end ratios 320 to hardbody

 

2. maybe a similar list of transmission ratios

 

3. A list of other datsun gears/trans that swap

 

4. maybe cross ref with titles for other cars

 

I think we can use this thread to brainstorm and then compile/edit and repost as a final reference thread, wrap it up in old Datsun ads out of the newspaper, and put a pretty bow on it. Aww, ain't that special

 

If you post please put in the post title the number(ie. 1,2,3,4....)from the category above so the person who edits can reference them, maybe keep it specific to model and put that in the title as well.

 

If you want to make a suggestion, please put that in the title of your post

 

I figure this may help the guys that know and keep answering the same questions to guys who don't know and keep pestering you. Plus, maybe we can find the info easier

 

anyone game?

 

no

 

 

yes

 

 

wha?

 

 

ohh......i see

 

 

:fu:2

[datsunaholic]

I made a table a long time ago. Only goes from 520-720s though, as I was sticking with the H190 rear end and the 320s and D21s used something else.

 

http://206.63.251.158/datsun/gearratios.txt

 

It starts with transmission ratios for various cars/trucks, has a list of rear ratios for 66-86 trucks, and then a table of engine RPMs with various combinations (using a single tire size for reference). The ratios are taken from the factory manuals, which aren't always 100% accurate as there may have been midyear changes that aren't in the manuals I have, but it's for the most part pretty accurate.

[zenndog]

From Datsunholic;

 

720 (81+) 5-speed

1st 3.321:1

2nd 2.077:1

3rd: 1.308:1

4th: 1:1

5th 0.833:1

 

 

Diesel

1st 3.592:1

2nd 2.246:1

3rd: 1.415:1

4th: 1:1

5th 0.813:1

 

 

'79 620, 80 720 5-speed

1st 3.592:1

2nd 2.246:1

3rd: 1.415:1

4th: 1:1

5th 0.882:1

 

'77-78 620 5-speed

1st 3.321:1

2nd 2.077:1

3rd: 1.308:1

4th: 1:1

5th 0.864:1

 

 

'77-79 280Z/ZX 5-speed

1st: 3.321:1

2nd: 2.077:1

3rd: 1.308:1

4th: 1:1

5th: 0.864:1

 

'80 280ZX 5-speed

1st: 3.062:1

2nd: 1.858:1

3rd: 1.308:1

4th: 1:1

5th: 0.773:1

 

'81-83 280ZX 5-speed

1st: 3.062:1

2nd: 1.858:1

3rd: 1.308:1

4th: 1:1

5th: 0.745:1

 

 

'73 620 4-speed

1st 3.657:1

2nd 2.177:1

3rd: 1.419:1

4th: 1:1

 

 

'74-79 620, 80 720, 280Z 4-speed

 

1st 3.592:1

2nd 2.246:1

3rd: 1.415:1

4th: 1:1

 

'77-79 200SX/78-79 510 (dogleg) 5-speed

1st: 3.382:1

2nd: 2.013:1

3rd: 1.312:1

4th: 1:1

5th: 0.854:1

 

 

'80-81 510 Dogleg

1st: 3.170:1

2nd: 1.921:1

3rd: 1.312:1

4th: 1:1

5th: 0.854:1

 

 

 

Rear ratios:

 

'66-69 520/521 (J-series): 4.889:1

'70-72 521 (L-series) 4.375:1

'73 620 (option/MT 3/4 ton) 4.889:1

'73-74 620 automatic 4.625:1

'73-78 620 manual. '75-79 automatic 4.375:1

'79 620 manual, '80 720 2WD 4.111:1

'81-86 720 2WD manual 3.889:1

'80-86 720 Automatic 4.111:1

'81-85 720 4X4 4.375:1

 

 

 

Assuming P205/70R14 tires for all (other tires vary)

 

This is the engine RPM at 60MPH with the following rear gear ratios and transmissions:

 

 

Rear 4-speed 79/80 truck 280Z/77-78 620 '80 280ZX '81-83 NA 280ZX 720 NAPS-z 5-speed Dogleg ('77-79 200SX & 510)

1:1 .882 .864 .773 .745 .833 .854

 

4.889: 3897.41 3437.52 3367.36 3012.70 2903.37 3246.54 3328.39

 

4.375: 3487.66 3076.12 3013.34 2695.96 2598.31 2907.22 2978.46

 

4.111: 3277.21 2890.50 2831.51 2533.28 2441.52 2729.92 2798.74

 

3.889: 3100.23 2734.40 2678.60 2396.48 2309.67 2582.49 2647.60

 

 

 

Thank you Datsunholic for this excellent info, this info is from the link provided above.

[zenndog]

320 transmission ratios, this info taken from service manual available online on the 620. http://www.olddatsuns.com

 

320 UP,UR ( does anyone have one of these heavy duty models?)

 

Part# 32010-07200

1st-4.94:1

2nd-3.01:1

3rd-1.73:1

4th-1.00

R-6.46:1

 

320 U,UN

1st-3.94:1

2nd-2.40:1

3rd-1.49:1

4th-1.00

R-5.16:1

 

Rear End Gears

 

320 UP-5.14:1

 

320 U,UN-4.875:1

 

Correct me if I am wrong but I belive that the "U" is the L model, the "UN" is the NL model and the "UP" I have never seen. Maybe the van or the crew-cab version? The models UP and UR show a much higher payload capacity.

Edited August 9, 2009 by zenndog

[zenndog]

521 gear ratios also taken from online manual from the 620. http://www.olddatsun.com

 

There are many 521 models listed in the manual, separated into three groups, one with a floor shift trans ( american export?), two with column shift (Japanese domestic, other export?) I focused on model L521T

 

Transmission Ratios

 

Part # F4W63

 

1st-3.657:1

2nd-2.177:1

3rd-1.419:1

4th-1.00

R-3.638

 

 

Rear End Ratio

 

4.875:1

 

datsunholic listed 4.889:1 above, manual shows 4.875:1 ( two other rear end ratios shown throughout different models. 4.625:1, 4.375:1)