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Old 02-13-2017, 12:02 PM   #1
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Exclamation Detroit TrueTrac in D35c - Issue Found!

Hello everyone,

I just had a TrueTrac installed in my D35c and have found an issue that is not mentioned anywhere on their website or in the paperwork for installation.

I have excessive axle shaft play now because the TrueTrac doesn't have the right sized axle spacer. Older D35s came with a center pin that was 0.687" in diameter, but later models came with a pin that was 0.718" in diameter. Eaton designed the D35 TrueTrac with the smaller sized axle spacer, and didn't design a different one (or just include/substitute a larger puck) for the later models. This play gives me a decent clunk when off-roading or going over a speed bump at an angle. Basically anything that exerts a moderate amount of sideways force on the Jeep will make it clunk.

I spoke to a customer service representative on the phone today and he told me this issue isn't all that common... I have seen a fair amount of people online complaining about it but oh well. He said to measure the gap, take the axle spacer into a machine shop, and have them weld and grind the end of it to reduce the gap to 0.020". That doesn't seem all too bad. I still don't understand why they do not just include two spacers, one for the smaller pin D35s and one for the larger... But anyway I just wanted to share my findings since this issue isn't anywhere in their paperwork for the TrueTrac.
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Old 02-13-2017, 04:04 PM   #2
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Delete

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Old 02-15-2017, 12:06 PM   #3
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What is the reason for delete? I run a TT in my D35 and it works flawlessly. I have no noise from the rear off-roading or on. It is my DD too.
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Old 02-15-2017, 12:43 PM   #4
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Quote:
Originally Posted by Diverdown87 View Post
What is the reason for delete? I run a TT in my D35 and it works flawlessly. I have no noise from the rear off-roading or on. It is my DD too.
It was a secondary post but I just edited the first to include the same information.

Maybe there are slightly different tolerances to the spacers or axles that you are running and you got lucky that it worked out. It could also be that your TJ from 1998 has the smaller diameter cross pin, so it matches what comes with the TrueTrac. I am not sure which years had the smaller or larger pins.

I have seen a fair bit of people discussing this issue though, so to me it doesn't seem like a totally isolated issue. In the end if this welding/grinding to get the additional width works it isn't that big of a deal, but it would be nice if they included the information somewhere so that you are aware of it.

I do have a noticeable clunk when going over certain bumps at an angle. It's pretty loud and I'm 99% sure that is what it is because it did not make that sound before the installation.
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Old 02-15-2017, 02:14 PM   #5
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I'm getting ready to install a TT in my D35 and D30. I've done all sorts of research and yours is the first I've heard of this problem. I'm also doing axle upgrades and going from 3.73 to 4.56 with a 4.0/auto, 4" lift on 33" MTR's. Hopefully no issues will ensue.
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Old 02-15-2017, 03:50 PM   #6
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Quote:
Originally Posted by lbat1965 View Post
I'm getting ready to install a TT in my D35 and D30. I've done all sorts of research and yours is the first I've heard of this problem. I'm also doing axle upgrades and going from 3.73 to 4.56 with a 4.0/auto, 4" lift on 33" MTR's. Hopefully no issues will ensue.
I spoke with Jerry Bransford, a very well known and knowledgeable man around these parts, and he assured me it is normal and harmless. He used to run a TT in his D35 years ago and said he had the same clunk that was enough to concern him, but he was assured from people he trusted that it was normal. So in my belief if he dealt with it and said it was normal, then it's fine by me. In the end it is maybe only 1/100" over the max gap specified by Eaton... I really can't imagine that making any difference.
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Old 02-15-2017, 04:06 PM   #7
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Quote:
Originally Posted by T.Wagner View Post

I spoke with Jerry Bransford, a very well known and knowledgeable man around these parts, and he assured me it is normal and harmless. He used to run a TT in his D35 years ago and said he had the same clunk that was enough to concern him, but he was assured from people he trusted that it was normal. So in my belief if he dealt with it and said it was normal, then it's fine by me. In the end it is maybe only 1/100" over the max gap specified by Eaton... I really can't imagine that making any difference.
I just put TT and 4:88's in my 02 4.0 d30 front and d35 rear. I noticed it before I ever let it down off the lift and called and they assured me it was "within tolerance". It makes the exact clunk as described. Hasn't been an issue wheelin or as dd.... so I'm gonna drive it like I stole it and not worry about it
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Old 02-15-2017, 04:24 PM   #8
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Quote:
Originally Posted by Diverdown87 View Post
What is the reason for delete? I run a TT in my D35 and it works flawlessly. I have no noise from the rear off-roading or on. It is my DD too.
x2 I ran dual TrueTracs for years and never had any noise or "clunking" issues.
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Old 02-15-2017, 04:42 PM   #9
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It looks like the 1994 and newer D35s had the larger cross pin. It is larger by 0.031".

I guess it is hit or miss whether you get some play/clunks or not. I have seen across the internet though that people have similar issues. I'm not going to worry about it. If anything it is BARELY over the maximum of 0.040" so I can't imagine it really making that big of a difference.
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Old 02-15-2017, 04:49 PM   #10
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Quote:
Originally Posted by T.Wagner View Post
This play gives me a decent clunk when off-roading or going over a speed bump at an angle. Basically anything that exerts a moderate amount of sideways force on the Jeep will make it clunk.
While it could be from the axle play, I would also double check that the clunking noise is not coming from your rear trackbar being loose or worn bushing.
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Old 02-15-2017, 04:51 PM   #11
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I have run dual Eaton TT's in my '03 - 4:88's with an auto and have not had any issues. I also ran synthetic oil ( vs dino ). I recall reading that dino is preferred - what does everyone else run ?
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Old 02-15-2017, 05:26 PM   #12
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Quote:
Originally Posted by Dextreme View Post
While it could be from the axle play, I would also double check that the clunking noise is not coming from your rear trackbar being loose or worn bushing.
I will check it out. It would be extremely coincidental that it would start clunking immediately following the TT install, but stranger things have happened!

EDIT: Trackbar is fine
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Old 02-15-2017, 05:27 PM   #13
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Quote:
Originally Posted by Gauss66 View Post
I have run dual Eaton TT's in my '03 - 4:88's with an auto and have not had any issues. I also ran synthetic oil ( vs dino ). I recall reading that dino is preferred - what does everyone else run ?
I am currently running Valvoline 80w-90 which I believe is a synthetic blend. I wanted to go for pure dino lube but I already had the Valvoline.
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Old 02-16-2017, 10:14 AM   #14
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i'm runnin master pro gl5 85-140 non synthetic which is what they recommended when i called em (did not have any recommended lube documented in box) the guy i spoke to was adamant about non synthetic for some reason??
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Old 02-16-2017, 11:52 AM   #15
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i'm runnin master pro gl5 85-140 non synthetic which is what they recommended when i called em (did not have any recommended lube documented in box) the guy i spoke to was adamant about non synthetic for some reason??
I know that Currie did a test a while back and they found that conventional cooled the gears better. It was an interesting find though because the conventional oil was hotter than synthetic, but the gears ran cooler.
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Old 02-16-2017, 12:42 PM   #16
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Originally Posted by lbat1965 View Post
I'm getting ready to install a TT in my D35 and D30. I've done all sorts of research and yours is the first I've heard of this problem. I'm also doing axle upgrades and going from 3.73 to 4.56 with a 4.0/auto, 4" lift on 33" MTR's. Hopefully no issues will ensue.
Just a suggestion but if you are gearing I would go with 4.88 for the 4.0 Auto combo. Even if you think you will stay with 33s 4.88 gearing will be a better choice and upgrading to 35s will be simpler.
Yes you can run 35s on a D35, I am doing it now. Started with a locker and 4.56 and 33s. Went to 35s and did like most people do. Over pedaled and blew up the locker and a shaft. Now am running same D35 but with the 4.56 TT and 35s.
Since I wheel it a bit harder I am going the 8.8 route though too. Only point I am making is you can run 35s on a D35 if you don't go nuts. Oh and 4.88 is a better gear ratio for the 4.0 auto....LOL
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Old 02-17-2017, 08:43 AM   #17
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Originally Posted by Diverdown87 View Post
Just a suggestion but if you are gearing I would go with 4.88 for the 4.0 Auto combo. Even if you think you will stay with 33s 4.88 gearing will be a better choice and upgrading to 35s will be simpler.
Yes you can run 35s on a D35, I am doing it now. Started with a locker and 4.56 and 33s. Went to 35s and did like most people do. Over pedaled and blew up the locker and a shaft. Now am running same D35 but with the 4.56 TT and 35s.
Since I wheel it a bit harder I am going the 8.8 route though too. Only point I am making is you can run 35s on a D35 if you don't go nuts. Oh and 4.88 is a better gear ratio for the 4.0 auto....LOL
For reasons other than my diff's, I'll be sticking with 33's. I originally considered going with 4.88's, but got talked into 4.56's. I think it will vary from person to person. It's also my DD...does that have any influence on your like of the 4.88's? I appreciate the advice.
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Old 02-17-2017, 11:16 AM   #18
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For reasons other than my diff's, I'll be sticking with 33's. I originally considered going with 4.88's, but got talked into 4.56's. I think it will vary from person to person. It's also my DD...does that have any influence on your like of the 4.88's? I appreciate the advice.
I had the same dilemma when regearing my d35/d30. the automatic transmission dictated 4:88s. The 4:88s match to the the overdrive best and I think are best for a daily driver ... you might find the auto constantly shifting down/up on the highway ...

BTW - my d30/d35 with upgraded axles and TTs will go for sale soon
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Old 02-17-2017, 11:50 AM   #19
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Originally Posted by Gauss66 View Post
I had the same dilemma when regearing my d35/d30. the automatic transmission dictated 4:88s. The 4:88s match to the the overdrive best and I think are best for a daily driver ... you might find the auto constantly shifting down/up on the highway ...

BTW - my d30/d35 with upgraded axles and TTs will go for sale soon
I might be interested in the D35 upgraded shafts... If you're willing to split things up like that
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Old 02-17-2017, 12:59 PM   #20
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Originally Posted by Gauss66 View Post
I had the same dilemma when regearing my d35/d30. the automatic transmission dictated 4:88s. The 4:88s match to the the overdrive best and I think are best for a daily driver ... you might find the auto constantly shifting down/up on the highway ...

BTW - my d30/d35 with upgraded axles and TTs will go for sale soon
Currently I'm running 3.73's. The shifting is pretty frequent during city driving with speeds between 35-50 on hills. When driving at interstate speeds 60-75, the shifting is not so bad...unless I have a strong head wind. That's one of the reasons I'm looking at 4.56 over the 4.88. I just wonder if I'll always be second guessing whichever I decide to go with.
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Old 02-17-2017, 02:39 PM   #21
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Currently I'm running 3.73's. The shifting is pretty frequent during city driving with speeds between 35-50 on hills. When driving at interstate speeds 60-75, the shifting is not so bad...unless I have a strong head wind. That's one of the reasons I'm looking at 4.56 over the 4.88. I just wonder if I'll always be second guessing whichever I decide to go with.
The overdrive is quite a gap from 3rd - there is no real solution. Are you running the 33's now ( btw - How wide are the tires ? ) If so - you should be happy with the 4:56
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Old Yesterday, 09:49 AM   #22
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The overdrive is quite a gap from 3rd - there is no real solution. Are you running the 33's now ( btw - How wide are the tires ? ) If so - you should be happy with the 4:56
33x12.5x15 I think the 4.56 will be best. thanks for the input!

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