Jeep ID'ing Dana 300 aftermarket parts

[Greg]

I found a deal on a built Dana 300, but the seller didn't build it, sounds like he bought it with a CJ that he is now parting out.

He thinks the 4 to 1 gears are TeraLow, but isn't sure. Any way to identify these while in the case, that anyone knows of?

And he doesn't know if it has HD outputs, I'd imagine if someone added the 4 to 1, at the very least they added a rear HD output shaft.

I just want to verify before I buy....

 

[mbryson]

I think you need to grind the case to fit the 4:1 gears?





The 2nd pic from a good thread from pirate4x4 when there was tech on there circa 2002 or so? Surprisingly still has photos to steal. https://www.pirate4x4.com/forum/general-4x4-discussion/98439-lomax-dana-300-4-1-gears.html (strange that I'm on a laptop and surfing 4x4 bb ? )


This kind of sums up my opinion of the D300?

 

[Greg]

That helps, I think LowMax and TeraLow are the only options, right?

I understand the costs to build one, which is why I want this one. I'll be running one in the Willys Crawler, but this one popped up with 4 to 1 gears, twin sticks and possibly a HD rear output for $400. So it's a bargin and I won't have $2000 into it.

 

[I Lean]

The HD rear output will have an aluminum tailhousing...I think the stock one will be cast iron? At least the 1980 short-output version was.

 

[Greg]

The HD rear output will have an aluminum tailhousing...I think the stock one will be cast iron? At least the 1980 short-output version was.

Good point! I'll study my 2 other stock D300's to see the difference.

 

[mbryson]

$400 for a “built” D300 would be ideal. Does it have the correct input for your trans?

 

[thenag]

My d300 has the aluminum tail housing, I believe it is stock. I know it is aluminum since I had to re-locate the breather and filled the OEM hole with aluminum welding rod...

You should be able to shift it into 4 low by hand and turn the case and and see if it is 4:1 or not.

Another thing to consider is the d300 flipped will probably leak, an atlas will probably not, however there is a little bit of comfort knowing that most parts for a d300 can be found on the shelf at napa or six states, and 1310 yokes are practically laying on the ground at junk yards.

Nathan

 

[Shawn]

I have put many tera 4:1 gears in Dana 300's and have never had to grind the case. Greg, I have a almost complete tera 4:1 gear set just sitting on the shelf. I snapped a pic of the numbers on the center gear, but it the side that has the number is the large gear and is next to the case. If by chance you can see the side of that gear I can send you my pic. Too dumb to know how to post pics these days

 

[Greg]

$400 for a “built” D300 would be ideal. Does it have the correct input for your trans?

I already have a JB Conversions 4L60E input shaft in my stock D300, so it would be an easy swap!

My d300 has the aluminum tail housing, I believe it is stock. I know it is aluminum since I had to re-locate the breather and filled the OEM hole with aluminum welding rod...

You should be able to shift it into 4 low by hand and turn the case and and see if it is 4:1 or not.

Another thing to consider is the d300 flipped will probably leak, an atlas will probably not, however there is a little bit of comfort knowing that most parts for a d300 can be found on the shelf at napa or six states, and 1310 yokes are practically laying on the ground at junk yards.

Nathan

I agree, hoping I can shift it into low and see how many turns the output makes compared to the input. I still want to pull the cover and look at the internals, for peace of mind.

 

[Shawn]

The number is: 300-421A/3

 

[Greg]

I have put many tera 4:1 gears in Dana 300's and have never had to grind the case. Greg, I have a almost complete tera 4:1 gear set just sitting on the shelf. I snapped a pic of the numbers on the center gear, but it the side that has the number is the large gear and is next to the case. If by chance you can see the side of that gear I can send you my pic. Too dumb to know how to post pics these days

No worries, Shawn!

Here's a tutorial on posting pics....

https://www.rme4x4.com/threads/neat-features-with-the-xenforo-forum-software.114005/#post-1092237

 

[Greg]

So the guy had a stock Dana 300 with twin sticks.... Put it in 4 low, spun it and 2.7 turns of the input for every 1 turn of the output. He swore it had a 4 to 1. Looks like the deal was too good to be true!

 

[Gravy]

Still $400 is what I'd expect to pay for a working stock unit. That's a deal these days

 

[Greg]

Still $400 is what I'd expect to pay for a working stock unit. That's a deal these days

Eh, I don't need it though.... I was only interested in the supposed 4 to 1.

 

[mbryson]

Still $400 is what I'd expect to pay for a working stock unit. That's a deal these days

Sadly, this is true. Finding a $100-200 case is pretty difficult. Last time I killed my cast iron case, I paid $90 plus shipping from PA for just the good case