620 rear end

Asked by Ernest Mar 27, 2011 at 11:30 PM about the 1978 Datsun 620 Pick-Up

Question type: Car Customization

I am buying a 1978 620 and it is geared kind if low. What kind of change can i make to improve the gear ratio and power so I can get maximum fuel mileage?

3 Answers

you will have to change the gears in the rearend to a higher gear.


The best thing for you to do to enable different gear ratios is to put a Ford 9" in the truck. Problem is 78 620's only came with 2 ratios that I know of , a 411 and a 423. I am not exactly sure I am correct at a 423, but it is something close to that.


78 620's had 4.37.5 ratios in most and a few 4.11's. I put a 1980 720 rear end in my 1978. It was out of a regular cab with a 5spd manual trans. It is a 3.90 ratio.

2 people found this helpful.

Your Answer:

620 Pick-Up

Looking for a Used 620 Pick-Up in your area?

CarGurus has thousands of nationwide listings and the tools to find you a great deal.

Postal Code:


Datsun 620 Pick-Up Experts

  • #1
    Andrew Jennings
  • #1
    Justin Goolsby
  • #1
View All

Find great deals from top-rated dealers


Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use. Content will be removed if CarGurus becomes aware that it violates our policies.