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Old 03-02-2018, 02:28 AM   #1
koreylee121781
 
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Default Diff change and gear question

I have a 1986 d21 4cyl auto 2wd..... What are the most common gears this came with? It very rarely leaves town so id like a lower geared rear end. What rear diff would be a direct swap that would give me more bottom end and pickup...???? I'm new and appreciate all opinions... standard shift? 4x4? Or am I better off with what I have?
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Old 03-02-2018, 09:37 PM   #2
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check your diff code, either on your door jamb or on the inner fender in the engine compartment. it might be HFxx or CAxx. xx would be numbers denoting your ratio i.e. HF37 would be a 3.7 to 1 ratio.

http://www.nissan4wheelers.com/topic...xles-do-i-have
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Old 03-03-2018, 02:54 AM   #3
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That's right. It's 3.7.... Say I find a 4x4 with lower ratio... would it be a direct fit with my 2wd?
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Old 03-03-2018, 04:25 PM   #4
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your best bet would be to find a v6 4WD with a HG43 or 46 rear axle. Trucks are pretty much bolt in depending on which e-brake the truck has. Pathys have the HG axle as well but they have the linked suspension so you would need to do some cutting and welding to put the spring perches on.

Thinking about it, you will need to cut off the perches on truck axle as well, as the 2wds the perches are under the axle and 4wds are on top of the axle.

your axle is a HF or H190 axle meaning the ring gear is 190mm, the HG axle is a H233 or 233mm ring gear. they do not interchange. if you can find a 2wd v6 model I think they had the HG axle but the ratio will be high like yours, but it would bolt in no issues, then find a 3rd member from a 4wd and it will be bolt in with no need to set the gears up.

if you have the CA axle, the one with a diff cover, you can find one with lower gears and set that gear set up.

3rd option is find a Rodeo with a Dana 44, people have installed that as well.

sit down at your computer and do a little researching to find out what best fits your needs and go that direction.
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