Pinion Bearing Went Out

Anti

forum member
Joined
Jul 24, 2017
Posts
612
Reaction score
275
Location
HSV, Alabama
After more digging it looks like it was just a poor forum source, because trying to go back find it, I am finding other people talking about pushing 1,000 hp without issues
 

Anti

forum member
Joined
Jul 24, 2017
Posts
612
Reaction score
275
Location
HSV, Alabama
I'm trying to see what 400 bucks more buys me vs the carbon clutch plates.

Also, something to consider, being honest, I am hard on my car at times. It satisfys my itch to drive it like I stole it, regularly.. probably why the carrier and pinion bearings are screaming now.
 

RED09GT

Equal Opportunity Offender
S197 Team Member
Joined
Jul 17, 2009
Posts
2,630
Reaction score
488
Location
Kelowna, B.C. Canada
The CF clutches are not that much of an upgrade, they still only have so much surface area.

I went with a Yukon Grizzly Locker and regret not going with the Truetrac.

Do it once and go with the Truetrac, lots of satisfied customers out there.
 

GlassTop09

Senior Member
Joined
May 24, 2019
Posts
1,141
Reaction score
525
Location
Farmington, NM
Understood. But I have a really hard time believing that there aren't driving or car setup situations where a lower TBR has some advantage. Otherwise, the Boss Mustangs would have been given a 4.0 Torsen instead of the 2.7.


Norm
I am about to pull the trigger on either a torsen, trutrac, or, slim chance, detroit locker (or whatever it is called.)

The thing that kept me from snatching up the trutrac last night was hearing of its 500hp limit. Anyone else read on this? Also, I only found one on Amazon. They are still make my these things new, right?
Very interesting.................
I found this link that does deal w\ the subject of TBR & diff carrier max TQ rating contained in an email conversation between a race car builder & a Torsen engineer (assuming that the builder was considering a Torsen diff for his racer). The product isn't the focus but the math concerning TBR & diff carrier max rating is the focus as that will be valid for any LSD diff. The reading above this email is the usual run of the mill stuff concerning LSD's & TBR but you may find it useful..........

The only thing I haven't found yet is the actual max TQ rating of the Eaton Detroit Tru-Trac diff (1 w\ 3.5 TBR) to find what is the max engine TQ range (depending on car's 1st gear final drive ratio being used along w\ it's weight) that this puppy can hold........ Somehow I do believe it is >10,000 ft\lbs.

http://www.carter-engineering.com/cerearend.htm

Hope this helps.

To the OP,
Glad you found most of your noise culprit.
Sucks that it entailed a $700.00 tire expenditure.
I myself just went thru an exercise recently w\ my Stang that proved to me the amount of increased NVH transfer that can occur when swapping out parts that connect the rear axle to the unibody that can make the rear diff sound like it's having issues so I can relate.
Which is a testament to just how solid this S197's unibody construction is..........
 

Midlife Crises

Senior Member
Joined
Jul 20, 2019
Posts
1,836
Reaction score
1,253
I spoke with Eaton before I ordered the TruTrac. One of the things the Rep. told me was that the TruTrac is stronger than any of the 31 spline axles on the market so breaking the carrier is not a common occurrence.
 

Anti

forum member
Joined
Jul 24, 2017
Posts
612
Reaction score
275
Location
HSV, Alabama
Done deal. Thank you all for humoring me. And thank you to the OP. Glad you found most of the noise also. Hopefully this and all new bearings and seals solves mine.

Screenshot_20201112-212524_Chrome.jpg
 

Greg D

Junior Member
Joined
Jan 16, 2020
Posts
48
Reaction score
30
Location
Central Texas
I had a shop install a 9" Eaton Tru-Trac in my '66 GT350, with 3.50 gear. The car has a Roush 342R motor that dyno'd 461HP and 420 lb-ft torque at the flywheel. During full-on acceleration, the car exhibited an extreme chatter that felt like the rear was going to explode until I coasted for 10-15 seconds. The shop loosened some clearances and it helped, but it will still do it once in awhile - again, only under very hard acceleration. With moderate acceleration, it behaves really well. However, I probably won't go with another Tru-Trac. Just my 2 cents.
 

Norm Peterson

corner barstool sitter
Joined
Feb 5, 2011
Posts
3,615
Reaction score
316
Location
RIP - You will be missed
I had a shop install a 9" Eaton Tru-Trac in my '66 GT350, with 3.50 gear. The car has a Roush 342R motor that dyno'd 461HP and 420 lb-ft torque at the flywheel. During full-on acceleration, the car exhibited an extreme chatter that felt like the rear was going to explode until I coasted for 10-15 seconds. The shop loosened some clearances and it helped, but it will still do it once in awhile - again, only under very hard acceleration. With moderate acceleration, it behaves really well. However, I probably won't go with another Tru-Trac. Just my 2 cents.
What kind of clearances did they loosen up?


Norm
 

Norm Peterson

corner barstool sitter
Joined
Feb 5, 2011
Posts
3,615
Reaction score
316
Location
RIP - You will be missed
Very interesting.................
I found this link that does deal w\ the subject of TBR & diff carrier max TQ rating contained in an email conversation between a race car builder & a Torsen engineer (assuming that the builder was considering a Torsen diff for his racer). The product isn't the focus but the math concerning TBR & diff carrier max rating is the focus as that will be valid for any LSD diff. The reading above this email is the usual run of the mill stuff concerning LSD's & TBR but you may find it useful..........

The only thing I haven't found yet is the actual max TQ rating of the Eaton Detroit Tru-Trac diff (1 w\ 3.5 TBR) to find what is the max engine TQ range (depending on car's 1st gear final drive ratio being used along w\ it's weight) that this puppy can hold........ Somehow I do believe it is >10,000 ft\lbs.

http://www.carter-engineering.com/cerearend.htm

Hope this helps.

To the OP,
Glad you found most of your noise culprit.
Sucks that it entailed a $700.00 tire expenditure.
I myself just went thru an exercise recently w\ my Stang that proved to me the amount of increased NVH transfer that can occur when swapping out parts that connect the rear axle to the unibody that can make the rear diff sound like it's having issues so I can relate.
Which is a testament to just how solid this S197's unibody construction is..........
Thanks for the link. I've saved it to a Word file for ongoing reference. FWIW, I recognize the name of the person asking the questions from Corner-Carvers.


Norm
 

Pentalab

forum member
Joined
Mar 5, 2013
Posts
5,211
Reaction score
1,093
The oem LSD is junk. The CF version is also junk. The CF plates will melt. The oem rebuild kits are cheap, like $100 for the CF kit, but who wants to be rebuilding an OEM LSD every year or two ?
 

GlassTop09

Senior Member
Joined
May 24, 2019
Posts
1,141
Reaction score
525
Location
Farmington, NM
Done deal. Thank you all for humoring me. And thank you to the OP. Glad you found most of the noise also. Hopefully this and all new bearings and seals solves mine.

View attachment 75056
I tried & tried, honest I tried.............................
But I just couldn't maintain enough willpower to resist so............. :igiveup:

Just ordered 1 of these for my car off Amazon as well so I am now officially very close to starting my 3.90 rear gear upgrade project once this gets in.

Last part to decide on is when to do this work (winter is here now & I'd be doing this outside off jack stands.....bbbrrrrr! or take it all to a shop). Good thing for me is no rush ATM as car is fine but just found from last servicing that I have developed a slight leak @ pinion seal....so this will be getting done sooner rather than later........
 

Latest posts

Support us!

Support Us - Become A Supporting Member Today!

Click Here For Details

Sponsor Links

Banner image
Back
Top