d44 help needed

[gogmorgo]

Double check where the shims go on the kit you end up with. Sometimes they go between the carrier and bearings and (also between pinion and bearing) but sometimes they go under the bearing race, which means you don't need to remove the bearings from the carrier (or pinion) to change the shim pack. But it's also very likely the pinion shims go under the bearing pressed onto the pinion, in which case you'd also want an inner pinion bearing for setup as well.

Confusingly when I redid my D35 just over a year ago, the instructions in the kit said to never put shims between the bearing races and the housing, but that was also the only place the included shims would fit. I didn't need the extra set of bearings I ordered at all because I never had to take the bearings back off. But it doesn't hurt to have an extra set on hand on the off chance something gets damaged. Also something I ran into, the etch numbers on the pinion were in millimetres, not thousandths of an inch. Took me a bit to figure out what was going on.

 

I'd second 4.10's, but don't forget you also need to regear the front to match if you are regearing. I chose to stick with 3.55's on my ZJ on 31's because I didn't want to spend the money to do the front at the same time, and it gets around just fine. I'm also a big fan of the Eaton Truetrac... there's also one in my ZJ.

[watchamakalit]

How will it run down the interstate with 4.10's?  I would like to be able to do 75 without destroying it. Lol

[ghetdjc320]

21 minutes ago, watchamakalit said:

How will it run down the interstate with 4.10's?  I would like to be able to do 75 without destroying it. Lol

http://www.grimmjeeper.com/gears.html

 

This will give you all the info you need for ratios and gearing 

[gogmorgo]

4.10 is a factory option, standard with the 2.5's, on like, 27" tires. It's loud at highway speeds, but not going to blow anything up on 31's.

[ghetdjc320]

2457 RPM in 5th gear at 70. That’s a nice place for the 4.0 to be. 

[watchamakalit]

Hmmmmmm

[Pete M]

4.56 was a factory option for the 2.5/auto.   and that's with dinky little tires!

[watchamakalit]

I don't think I want to go that far down the rabbit hole pete.

[Eagle]

5 hours ago, watchamakalit said:

How will it run down the interstate with 4.10's?  I would like to be able to do 75 without destroying it. Lol

 

My spreadsheet with all this data seems to have disappeared from Google Docs. I guess I've been canceled. I'll look into getting it posted again but, for the moment, here's a screen shot for 31" tires:

 

 

75 MPH in overdrive is 2645 RPM. That won't destroy anything. In the "good old days," before overdrive transmissions became commonplace, standard gearing for cars with the AMC 6 (basically the same engine as the 4.0L, but without fuel injection) was set up for 25 MPH per 1,000 RPM. So, 2500 RPM was 60 MPH, and 3,000 RPM was 72 MPH. And back then the engines would still go 300,000 miles if you did routine maintenance.

[ghetdjc320]

1 hour ago, watchamakalit said:

I don't think I want to go that far down the rabbit hole pete.

There’s not that much of a difference between 4.56 and 4.10. Definitely doable on 31’s. The crawl ratio is good also. And your setup for 33’s should the mood strike. 

[watchamakalit]

I don't plan to wheel it, so crawl ratio isnt that much of a deal to me. And not plans to go bigger. Its just my daily so I think 4.10 will be the ticket.

[ghetdjc320]

45 minutes ago, watchamakalit said:

I don't plan to wheel it, so crawl ratio isnt that much of a deal to me. And not plans to go bigger. Its just my daily so I think 4.10 will be the ticket.

4.56 is nice and peppy 

[Eagle]

5 hours ago, watchamakalit said:

I don't plan to wheel it, so crawl ratio isnt that much of a deal to me. And not plans to go bigger. Its just my daily so I think 4.10 will be the ticket.

 

Good choice.

[Eagle]

My tire/gear ratio spreadsheet is still up on Google Docs, so let's see if this link works:

 

https://docs.google.com/spreadsheets/d/1pHFuhGgj6dQDfzyfFJH5z7NCDLW2KX3ABQgAJr3lBvM/edit?usp=sharing

 

[zomeizter]

On 10/5/2021 at 7:43 PM, Eagle said:

My tire/gear ratio spreadsheet is still up on Google Docs, so let's see if this link works:

 

https://docs.google.com/spreadsheets/d/1pHFuhGgj6dQDfzyfFJH5z7NCDLW2KX3ABQgAJr3lBvM/edit?usp=sharing

 

Ninja!

[watchamakalit]

Ok so I have everything around except setup bearings. Can I use the old bearings from the previous carrier and make some setup bearings or do I need brand new bearings? 

 

Just trying to make sure I have everything before I dive in.

[gogmorgo]

You're going to want new bearings. Gear setup is a game of thousandths of an inch, so if you set up with worn bearings, all your measurements will change when you install the new bearings.

[watchamakalit]

6 hours ago, gogmorgo said:

You're going to want new bearings. Gear setup is a game of thousandths of an inch, so if you set up with worn bearings, all your measurements will change when you install the new bearings.

Thats what I thought but want sure. I don't want to spend alot on this project but I'm not gonna cut corners to save a penny.

[watchamakalit]

I posted my first pattern pics in my build thread.  Look ok?  Seems good to me but can a guy really get that lucky on his first setup?

[watchamakalit]

Ok here is final pattern I think. This is with the setup bearings. Everything is set except carrier preload. Ill do that on final assembly.