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  #1  
Old September 8th, 2019, 18:35
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tjmotter tjmotter is offline
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TrueTrac install

My XJ is destined for a cold climate and I want to upgrade the D35 open carrier to an Eaton TrueTrac to make it easier to handle on ice (very little off-roading so I have no interest in upgrading to a D44 or other).


I am planning to reuse the existing crown and pinion which "should" mean I only have to focus on properly shimming the carrier. Any "gotcha's" from those of you who have done this?


Also, does the stock XJ use interior shims or exterior? I have seen blowups that show that the shims fit between the bearings and the carrier but every video on Youtube shows people installing shims on the exterior of the bearings. Not sure which I should be planning for.


Thanks in advance
Todd

Last edited by tjmotter; September 9th, 2019 at 05:21.
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  #2  
Old September 8th, 2019, 19:04
RCP Phx RCP Phx is online now
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Re: TrueTrack install

Don't spend the money, get a lunch-box locker instead.
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  #3  
Old September 8th, 2019, 19:56
dktool dktool is offline
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Re: TrueTrack install

Quote:
Originally Posted by RCP Phx View Post
Don't spend the money, get a lunch-box locker instead.
Not for ice. Been there, they suck with both lips
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  #4  
Old September 8th, 2019, 20:23
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4x4JeePmaNthINg 4x4JeePmaNthINg is offline
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Re: TrueTrack install

I know you said you don't care about upgrading, but you could get a disc brake C8.25 already Trac lok equipped probably for 1/3 the price of a true Trac. Though eatons are good at what they do, just sad to dump the money into a turdyfive.

If your not doing this yourself it's buku dara for install:

If you I insist this guys for good into & funny.

Watch "Detroit Truetrac Differential Install Part 1" on YouTube
https://youtu.be/BI43XKS5KVU


Best of luck
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  #5  
Old September 9th, 2019, 04:00
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Tim_MN Tim_MN is offline
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Re: TrueTrack install

If you have the necessary tools and technical skills the install should go OK.

I agree that you could save money and upgrade the axle by finding a good used Chry 8.25 with factory Limited Slip, and refurbish the Limited Slip.



Quote:
Originally Posted by dktool View Post
Not for ice. Been there, they suck with both lips
My rear lunchbox locker behaves in Mn winters almost exactly the same as the Limited Slip it replaced. I would recommend a rear auto locker for winter weather. Front auto lockers do suck with both lips for winter driving, I would not recommend one.
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  #6  
Old September 9th, 2019, 04:13
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tjmotter tjmotter is offline
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Re: TrueTrack install

Thanks for the link!


You know, I keep hearing that I can get a good diff for a % of the cost of an upgrade but I am just not seeing it. The TrueTrac is going to cost $480 and I can't find a decent diff starting point for under $800. Tack on the $480 to upgrade it + another couple of hundred for new axle seals, bearings etc and the minimum cost I see is $1000 (if the diff doesn't need to be upgraded) or $1500 if it does and I still have to do all the work. Best price I have seen on a diff that is ready to go is ~$1700 but the pickings are slim which makes me suspect I will have to re-gear the front diff (or the new rear) to match which adds additional $$.


This XJ is closing in on 30 years old and I have restored it to "like new" inside and out but it will never see another trail. It might haul a boat (18ft max) to the lake and back. It will probably spend some time on gravel roads but it will definitely be asked to plow through snow and to traverse ice.



My first XJ ('93) had a factory limited slip and I loved the way it handled snow and ice. I could save $100 and just install a traction-lock like my first XJ but I heard that the Truetrac was just a bit better. I want to be able to lend this rig to my brother in the depths of winter and not have to school him on how to handle a locker on icy roads.


Like all the other videos this guy shims the outside of the bearings. The blowup pics I have seen show that the D35 places shims on the interior which means I need to buy/make a set of setup bearings. Would love to hear from someone who has done this which is correct on a '90xj.


thx
Todd

Last edited by tjmotter; September 9th, 2019 at 05:24.
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  #7  
Old September 9th, 2019, 05:11
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tjmotter tjmotter is offline
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Re: TrueTrac install

Tim,


I know that you know your stuff and driving in MINN in the winter can be similar to what I expect to see (but having driven there in the winter I know it isn't as bad as what I will face). What brand of locker did you go with? Also when you say that "it is similar to a LSD" is it similar enough that you would hand the keys to your 17 year old daughter without any instruction and let her tear off at -35 with the roads covered in ice?


thx
Todd
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  #8  
Old September 9th, 2019, 08:20
RCP Phx RCP Phx is online now
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Re: TrueTrack install

Quote:
Originally Posted by 4x4JeePmaNthINg View Post
I know you said you don't care about upgrading, but you could get a disc brake C8.25 already Trac lok equipped probably for 1/3 the price of a true Trac.
There is no factory "bolt-in" application for this. yes you could make/build one but that means work/expense.
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  #9  
Old September 9th, 2019, 09:42
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IslanderOffRoad IslanderOffRoad is offline
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Re: TrueTrack install

Quote:
Originally Posted by tjmotter View Post
Thanks for the link!


You know, I keep hearing that I can get a good diff for a % of the cost of an upgrade but I am just not seeing it. The TrueTrac is going to cost $480 and I can't find a decent diff starting point for under $800. Tack on the $480 to upgrade it + another couple of hundred for new axle seals, bearings etc and the minimum cost I see is $1000 (if the diff doesn't need to be upgraded) or $1500 if it does and I still have to do all the work. Best price I have seen on a diff that is ready to go is ~$1700 but the pickings are slim which makes me suspect I will have to re-gear the front diff (or the new rear) to match which adds additional $$.


This XJ is closing in on 30 years old and I have restored it to "like new" inside and out but it will never see another trail. It might haul a boat (18ft max) to the lake and back. It will probably spend some time on gravel roads but it will definitely be asked to plow through snow and to traverse ice.



My first XJ ('93) had a factory limited slip and I loved the way it handled snow and ice. I could save $100 and just install a traction-lock like my first XJ but I heard that the Truetrac was just a bit better. I want to be able to lend this rig to my brother in the depths of winter and not have to school him on how to handle a locker on icy roads.


Like all the other videos this guy shims the outside of the bearings. The blowup pics I have seen show that the D35 places shims on the interior which means I need to buy/make a set of setup bearings. Would love to hear from someone who has done this which is correct on a '90xj.


thx
Todd
Are you on a stock gear ratio? Is Houston where you are currently?

I see 8.25's on Craigslist here all the time for $200 or so. Heck I think I sold mine for $100 a couple years back.

While I get not wanting to spend the money to swap, I've seen enough D35 horror stories even on pavement) that I'd be worried about spending the money twice if you upgrade it.
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  #10  
Old September 9th, 2019, 10:16
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4x4JeePmaNthINg 4x4JeePmaNthINg is offline
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Re: TrueTrack install

Quote:
Originally Posted by RCP Phx View Post
There is no factory "bolt-in" application for this. yes you could make/build one but that means work/expense.
True,
The disc brakes would be additional work, but he does have options for donor C8.25 with factory L.S.D..

As islander mentioned he's about 200$ for a swap (or less) plus some brake/diff fluid cost vs $480 TT + a master install kit $100+ (if he's bothering). Then labor $$$$, or not?
Just saying if your ready to dump that coin into an axle, any axle, get the most bang for your buck....

Seems cheaper and easier than setting up gears again, to each their own though.
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  #11  
Old September 9th, 2019, 10:28
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4x4JeePmaNthINg 4x4JeePmaNthINg is offline
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Re: TrueTrack install

I guess this would be an option to.
https://victoriatx.craigslist.org/pt...957571679.html
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  #12  
Old September 9th, 2019, 10:36
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Tim_MN Tim_MN is offline
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Re: TrueTrac install

Quote:
Originally Posted by tjmotter View Post
What brand of locker did you go with? Also when you say that "it is similar to a LSD" is it similar enough that you would hand the keys to your 17 year old daughter without any instruction and let her tear off at -35 with the roads covered in ice?


thx
Todd
I have a PowerTrax No-Slip lunchbox Locker. Very predictable unlocking behavior, no clicking in turns, but it will BANG maybe once or twice a year.

Open/LS/Locker, I would find a huge open area and teach the family how to drive in slippery conditions. Yes, the No-Slip handles winter/behaves the same as the Limited Slip did, if you mash the gas, the tires will break traction and the rear end will swing out. If you mash it hard enough, the Cherokee will spin 360+.

I would not spend a dime on a D35. Around here a Cherokee axle is about $100-200. Unless the bearings are noisy or the seals are leaky, it wouldn't need anything. My 98 has +284,000 miles and both axles are original with no leaks.
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Quote:
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  #13  
Old September 10th, 2019, 08:13
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denverd1 denverd1 is offline
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Re: TrueTrack install

what tire size?

got a buddy running 31s on a locked 35. some have blown up in spectacular fashion (and created a bit of internet lore in the process) but people do stupid shit every day and hurt themselves going to the bathroom. for the OP's intent, i wouldn't swap the 35.

I'd go auto locker in rear as well.
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  #14  
Old September 10th, 2019, 11:02
Mach2nh Mach2nh is offline
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Re: TrueTrack install

If you want it to handle better on snow covered roads and dont care about wheeling then you dont want to install any traction aid in the axle. Spend the money on a good set of studded snows and winter wheels. 100 times better.
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  #15  
Old September 10th, 2019, 16:16
bwinter1946 bwinter1946 is offline
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Re: TrueTrack install

Agree with above ^^^^

I prefer an open differential on icy roads. Lateral stability is gone if both rear tires are spinning. On my XJ I travel with both diffs open and in full time four wheel drive. Very stable that way. I can always lock up if needed. I have a 242 transfer case with ARBs front and rear. Just saying how I do it.
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