diff tru trac

[Drew SS]

what dimensions would i be lookin for if i was to order one for my ute

[MyM8V8]

Drew SS said:

what dimensions would i be lookin for if i was to order one for my ute

Just look up some of the Yank part suppliers. The one you want is a 28 spline for a Pontiac GTO.

Part No. 912A642

[after_shock]

Do these have different ratios to the standard ones?

[MyM8V8]

after_shock said:

Do these have different ratios to the standard ones?

Its only the LSD centre diff section you buy. You then fit your old crownwheel to it.

[after_shock]

MyM8V8 said:

after_shock said:

Do these have different ratios to the standard ones?

Its only the LSD centre diff section you buy. You then fit your old crownwheel to it.

Ah right thanks for that. They seem to get good reviews though!

[MyM8V8]

A massive improvement over the stock item, and not expensive either.

[007 VXR]

can some one tell me .
what inprovments you get
where to get one
and will roger(fish) fit it ???

thanks

[MyM8V8]

007 VXR said:

can some one tell me .
what inprovments you get
where to get one
and will roger(fish) fit it ???

thanks

Get from the states e.g summitracing.com. Group buy might be a good idea.

Anyone good garage can fit a diff. Make sure they get the lash right though. Roger will do a diff swap for around £300 ish IIRC. (New bolts, oil and bearings extra if required)He did Globals and mine and both have been caned up the track with no adverse effects.

Benefits: No more banging and clunking, no special oil or friction modifier needed, smooth power delivery, torque sensing properties, will take 500rwhp.

Bad bit: Drive splines slightly overcut making the axle fit sloppier.

I would not go back to a stocker unless in emergency.

[007 VXR]

thanks

[Drew ss]

Thanks gareth now axel tramping whats the best way to stop that

[Global-i]

Drew ss said:

Thanks gareth now axel tramping whats the best way to stop that

Drag Bags or one oversize drive shaft. When I get a minute, I am going to try one of the weights from an Astra Driveshaft on one side hopefully this will simulate an oversize driveshaft.

[Drew ss]

Global-i said:

Drew ss said:

Thanks gareth now axel tramping whats the best way to stop that

Drag Bags or one oversize drive shaft. When I get a minute, I am going to try one of the weights from an Astra Driveshaft on one side hopefully this will simulate an oversize driveshaft.

someone told me a harropdiff cover sorts it out as well true or false

[Global-i]

I have never had an issue with tramp on the road, however at the track Harrop diff cover did not help.

[007 VXR]

Global-i said:

I have never had an issue with tramp on the road, however at the track Harrop diff cover did not help.

i found it helped keep things nice on the road

[Drew ss]

it seems to do it a lot in the wet when u nail it pulling out of an intersection or somethin

[Dr-Bob]

Got the tru trac in the viper and loads better over stock....

[MyM8V8]

Drew ss said:

it seems to do it a lot in the wet when u nail it pulling out of an intersection or somethin

Symptomatic of the Holden IRS, I'm afraid.

I bought a Harrop diff cover (only coz it looks the biz). You can buy a nolathane bush to replace the rubber stock one at the back of the diff. That'll save loads of cash and stiffen it up.

I also had replaced, all the bushes in the rear with urethane items.

I also fitted some aftermarket adjustable shocks and have just got a HD 3/4" sway bar ready to go one. The stock one at 16mm is puny. Will aslo be fitting oversize drive shaft on the driver side as this has been shown to work by Cadillac engineers developing the CTSV.

TBH you'll never get it all out unless you do something about prop, gearbox and engine mounts. The flexibility caused by these winding up and letting go, don't help things at the back.

Unlike Global, I don't believe in drag bags. Unfortunately, when the bag stops the spring working, the spring rate increases, or worse, goes to infinity, the tyre just shears. So although the bag might help to stop the oscillation (tramp) it also reduces traction IMHO.

I've got to say since fitting the Tru trac and all the other things, tramp on mine has been reduced big time, although I can still get it in extreme situations.

Drew, if you want some shocks that help, I can get you some, same as mine. I'm having some more stuff sent over from the states. Pm me if you want a price.

Edited by MyM8V8 on Wednesday 2nd September 12:03

[Drew SS]

ok just tried to pm u couldnt could u pm me the price of the shocks am goin to order diff centre this arvo. just out of interest did u get them bushes made or source them i have a 2 metre length of nolethane its diameter would be big enough to turn up a few bushes alright but its white now the colours of nolethane do they represent strenghts or somethin

[MyM8V8]

Drew SS said:

ok just tried to pm u couldnt could u pm me the price of the shocks am goin to order diff centre this arvo. just out of interest did u get them bushes made or source them i have a 2 metre length of nolethane its diameter would be big enough to turn up a few bushes alright but its white now the colours of nolethane do they represent strenghts or somethin

I dont know about the colours, I think it's more aesthetics, but I suppose it could be?

The bushes came from Monkfish so I suppose they are the peddars brand, but there are other makes available in Oz. You can order just a rear bush kit make sure you include the one for the diff cover if not getting a Harrop. Have a look on the peddars site.

I've PM's you

Edited by MyM8V8 on Wednesday 2nd September 20:17