Axle swap

[Lonewolf1990]

Is it possible to swap out the rear axle? 

[NC85ST]

Do you mean the entire rear diff? What are wanting to put in it?

[Lonewolf1990]

The entire rear axle , I was thinking of a hilux axle 

[Farmer]

Certain years have almost the same wms to wms as  datsuns. Need different perches and custom yoke. Plus a few other things too. Do some searching on this site. Been covered

[NC85ST]

Is there something wrong with the original or just want a different ratio?

[Lonewolf1990]

On 10/16/2019 at 2:00 PM, NC85ST said:

Is there something wrong with the original or just want a different ratio?

I have big wheels in my rear so I just want a stronger axle or gears 

[datzenmike]

The H-190 is more than strong enough for a '77 L20B. In fact good for almost 300 ft. lbs. of torque. The L20B is barely 1/3 of that.

 

If by 'big wheels' you mean wider that has no effect on gearing or axle strength. If you mean larger diameter this would alter the effective gear ratio you have in the differential and it might feel a little sluggish taking off. Your stock tire is 23.65" diameter and you have a 4.375 ratio differential. If you were able to lift it and get 31" tires on it it would feel like the same as if you changed the differential to a 3.33 ratio. To correct for 31" tires you would need a 5.75 ratio differential.

[Lonewolf1990]

I have pro trac 50 tires in the rear 

[datzenmike]

I have no idea what these are. Width? height? Stock 14" or 15" rims?? 205 50R14??? 185/50R15?? what

[Lonewolf1990]

The specs say N50-15 I have them on 15 inch rims  it’s Seay section width is 12.65

[datzenmike]

I guess you're going to make me work for this. N50/15s are close to 345/50R15s about 12.8" tread width and needs a 9 or 10" rim.

 

So what are you using for an engine? What are you after with these things??

 

 

 

 

 

[Lonewolf1990]

Wasn’t making u work for it , that’s is what I found online about the tires I have , I have the stock L20b

[G-Duax]

LoL, you will never hurt an H190 with a stock, or even modified L20b.

Doubt you would hurt one with an SR20DET with mods.

The Nismo LSD for the H190 has the exact same internals as one for the S14 Silvia turbo.

 

[datzenmike]

8 hours ago, Lonewolf1990 said:

Wasn’t making u work for it , that’s is what I found online about the tires I have , I have the stock L20b

 

 Tire choice is not going to affect your differential strength but being larger diameter will. You're asking your L20B to move the truck about 22% farther on each turn. That's a lot or extra work. You have a 4.375 differential gear, going from a stock 23.6" to a 29" wheel diameter, it will drive like you have a 3.56 ratio. The effect will be that you'll have a hard time driving into the wind, much slower passing times and harder to climb hills. Acceleration? well forget that. You would need a 5.33 ratio differential to correct this 

 

These tires are a very poor choice. No way to tuck foot wide tires inside the fenders so they will throw dirt all over the sides of the truck and there may be laws about exposed tires without some sort of mug flaps over them and the risk of the body hitting them on bumps and carving grooves in them. Better check before pulled off the road. The front will be severely raked and pointing down.  Speedometer out 11 MPH at 50.

 

I would advise buying sensible shoes for your truck.

[]2eDeYe]

I sure can't tuck foot wide tires lol

 

 

 

Tire height is critical to axle longevity as Mike stated. 

 

An idea of what your end goal is might be helpful. Any pics of the tires your trying to run?

[]2eDeYe]

On 10/15/2019 at 4:02 PM, Lonewolf1990 said:

Is it possible to swap out the rear axle? 

 

 

Short answer, yes.

 

Buy these and get to swapping. 

 

https://www.ruffstuffspecialties.com/catalog/25TOY-PERCH.html?gclid=EAIaIQobChMI0obah8Gy5QIVQx-tBh160whxEAQYASABEgKVy_D_BwE

 

[datzenmike]

5 hours ago, datzenmike said:

 

I would advise buying sensible shoes for your truck.

 

It's a 2wd '77 with L20B. It will barely spin the 6.00 X 14s that they came with. What are you after because this is going to look clown shoes.

 

[G-Duax]

 

1 hour ago, datzenmike said:

 What are you after because this is going to look clown shoes.

 

Excellent analogy.

OP, don't try major modifications to correct a problem that you don't have.

Edited October 23, 2019 by G-Duax

[G-Duax]

Time to walk away, seeing I am screwing up my own posts........

Edited October 23, 2019 by G-Duax

[Lonewolf1990]

On 10/23/2019 at 5:59 AM, datzenmike said:

 

 Tire choice is not going to affect your differential strength but being larger diameter will. You're asking your L20B to move the truck about 22% farther on each turn. That's a lot or extra work. You have a 4.375 differential gear, going from a stock 23.6" to a 29" wheel diameter, it will drive like you have a 3.56 ratio. The effect will be that you'll have a hard time driving into the wind, much slower passing times and harder to climb hills. Acceleration? well forget that. You would need a 5.33 ratio differential to correct this 

 

These tires are a very poor choice. No way to tuck foot wide tires inside the fenders so they will throw dirt all over the sides of the truck and there may be laws about exposed tires without some sort of mug flaps over them and the risk of the body hitting them on bumps and carving grooves in them. Better check before pulled off the road. The front will be severely raked and pointing down.  Speedometer out 11 MPH at 50.

 

I would advise buying sensible shoes for your truck.

Im

going for the hot rod look, I have the Fiberglass  fender  flares on my truck so I’m not worried about the dirt getting kicked up

[datzenmike]

You'll have to raise the rear of the truck quite a lot. The rear fender will be just about riding on the tire tread. You'll want 3-4 or more inches above that to allow for suspension travel. If not the fenders will cut deep grooves in them. You'll be looking into the road. Worse than this.

 

 

 

The 620's a small truck 8 or 9" tires are more than big enough. An old trick from the muscle car era is to run smaller tires on the front. This gives the illusion of the rear tires being even bigger than they are.

 

Just don't fuck the truck up, so when you give up on this you can still return it to something more reasonable.

[Lonewolf1990]

4 hours ago, datzenmike said:

You'll have to raise the rear of the truck quite a lot. The rear fender will be just about riding on the tire tread. You'll want 3-4 or more inches above that to allow for suspension travel. If not the fenders will cut deep grooves in them. You'll be looking into the road. Worse than this.

 

 

 

The 620's a small truck 8 or 9" tires are more than big enough. An old trick from the muscle car era is to run smaller tires on the front. This gives the illusion of the rear tires being even bigger than they are.

 

Just don't fuck the truck up, so when you give up on this you can still return it to something more reasonable.

I do have small tires in the front I have a staggered set and and I have my rear already lifted I don’t have issues with rubbing 

[datzenmike]

I think you'll soon get tired of the shitty acceleration, speedometer out 20%, headlights shooting into the dirt, rarely getting out of 2nd in town and sliding off the seat when you hit the brakes.

[]2eDeYe]

Pics of truck? :)

[Stoffregen Motorsports]

Pro Trac tires have a very specific 60's-70's muscle car look. If you chose those tires for the look, then raising the rear of the truck will fit that look. I don't really like that look, and would rather make some mods to get it lower, like narrowing the rear axle and modifying the inner wheel wells. Flares are a good idea, but don't necessarily jive with the tire selection.

 

What are you going for? A specific look?

 

I never think twice about modifying a vehicle. I say go for it.

 

For the record, any part from any vehicle, anywhere, anytime, can be made to fit into anything. Asking if it can be done tells me that you are looking for an easy axle swap. If you're not into hard work, taking measurements and figuring things out as you go, then leave it alone.

 

There is also a dark side to modifying though and there is one guy here on Ratsun that comes to mind. He certainly wasn't scared to hack his truck up. What he ended up with is a freakin death trap, and he hauls his baby around in it. I think some of you may know to whom I am referring. People like that should not modify vehicles...