31 Spline FRPP Cobra Trac Loc is junk

[4a7191a]

Mines been great. Only been to the track a few times on it though, but 8+ years of Mexico races. :/

[slojunk91]

Originally Posted by Mach828

Either. If it doesn't slide back together try the carrier shims. You really can't pack it too tight because it won't go back together.

It won't go back together even without the added shim. I don't have any carrier shims thinner than .025. Going to try to locate some tommorrow. Have you ever had to use thinner shims because I can't install the spider gear with the washers? It'll only go together without them.It's that tight.

[mikeracing]

FRICTION MODIFIER MAKES IT SLIP MORE!!!!!

so adding friction modifier will be closer to 1 wheel peel


you can also switch to dyno oil if you need it to lock more because the synthetic is already super slippery so its a double whammy to run friction modifier

[slojunk91]

Originally Posted by mikeracing

FRICTION MODIFIER MAKES IT SLIP MORE!!!!!

so adding friction modifier will be closer to 1 wheel peel


you can also switch to dyno oil if you need it to lock more because the synthetic is already super slippery so its a double whammy to run friction modifier

^^^you are correct

[Mach828]

Dang. Maybe your clutches are still really new and thick. You will have to play around with the shims.

And to the above, That's why I went to conventional nonsythetic gear oil.

Sent with a shot of DROID go fast

[slojunk91]

Originally Posted by Mach828

Dang. Maybe your clutches are still really new and thick. You will have to play around with the shims.

And to the above, That's why I went to conventional nonsythetic gear oil.

Sent with a shot of DROID go fast

Got it to work with added shim(still pretty tight)with thinner carrier shims. Just going to notch cross pin(4.56),fill it,& test drive. So far so good...i'll update.

[not a gt]

Originally Posted by Mach828

Dang. Maybe your clutches are still really new and thick. You will have to play around with the shims.

And to the above, That's why I went to conventional nonsythetic gear oil.

Sent with a shot of DROID go fast

828, is your car street driven alot or mainly track?? I put in friction modifier and Lucas Syn and I can verify I have equal length marks on the pavement...just wondering if this is one of those "could do for one and not another" deals.

[slojunk91]

Originally Posted by not a gt

828, is your car street driven alot or mainly track?? I put in friction modifier and Lucas Syn and I can verify I have equal length marks on the pavement...just wondering if this is one of those "could do for one and not another" deals.

I'm adding generic 85/140 to my junk with no modifier..let's find out...I'm thinking 828 results.

[Mach828]

Originally Posted by not a gt

828, is your car street driven alot or mainly track?? I put in friction modifier and Lucas Syn and I can verify I have equal length marks on the pavement...just wondering if this is one of those "could do for one and not another" deals.

It sees weekend duty mostly, I have raced it on the roadcourse, and I drag race it. I'm going to take it on a 450 mile road trip this weekend.

[slojunk91]

Just went down the road with it and WOW! 4.56 is where it's at even compared to 4.30. Trac loc feels pretty snug with very little slow turn bind. Nice even 2 wheel burnout once again! Shooting for Wednesday test/tune. I'll update. Thank you for all the helpful advice to everyone especially 828.

[not a gt]

Good deal, glad it all worked out

[Mach828]

Glad to hear it went well. 4.56 gears are awesome, I loved them when I was NA.

Sent with a shot of DROID go fast

[slojunk91]

Man....I hate to say this....on my 2nd pass,the LR stopped spinning midway thru the burnout. On the street it worked perfect,it still does. Just seems once the tires start to see heat and grab(MT DR's) the LR stops. I still really appreciate all the helpful input but I think I'm going to try the Tru Trac.Been doing a little research and it seems like its the way to go. I see the results capt.m had thru old posts and you tube vids. My combo isn't as quick as he is but I want dead on reliability. Oh, I still managed a 12.62 @ 111.12 on that pass(crappy 1.85 60).Still no spray.

[Mach828]

Dang. That sucks. I am surprised it stopped spinning. I've done 2nd gear burnouts with 10.5" MT Drag Slicks with this tlok.

[slojunk91]

Originally Posted by Mach828

Dang. That sucks. I am surprised it stopped spinning. I've done 2nd gear burnouts with 10.5" MT Drag Slicks with this tlok.

I'm very surprised myself. It's works GREAT on the street. I'm running 275/50 MT DR's @ 14 psi, 2nd gear burnouts and it's doing this only at the track when it starts to bite. Also I'm going to try 28x11.5 MT ET streets (bias ply)to get my '60 where it should be along with a Tru Trac. Thank you once again for your helpful info...It's appreciated.

[rcodemach1]

I've been getting 1.48 60s in my '98 with that diff, but I may have rebuilt it with standard frictions. This is on MT 275/50-15 drag radials and it's been together for 5 years now. I have heard that while carbon fiber holds up to abuse well, it actually is not as sticky as the standard friction material. Its common to hear about this in regard to transmission bands.