So after 95k of hard miles in the saff it was time for a diff rebuild.
After a bit of research and a few phone calls to specialists i soon realised it was a bit of mine field and at my power level and torque 400 bhp and 400 ft lbs, one guy said you need a gripper at that level.
So off i go again to do some more research and asking a few mates what thoughts they had and found out that a gripper although a great diif and a lifetime guarantee is bloody harsh and noisy for a road car.
So i give Bara a ring he asks what power what i use the car for etc etc. I also explain what the diff is doing and send him a video.
Imo a cossie should be a cossie and Bara came up with there uprated ZF type planet gears and a uprated viscous diff unit 240nm.
I dropped the diff off and within the week i have a email with loads of pics saying its finished.
New seals, bearings all set up ready to fit.
I would like to say Bara and Sean (who built my diff) what a great experience i had and they really know there stuff.



I will be busy at the weekend 👍

 

All depends how you drive it’s the crown wheel and pinion that’s week and there’s nothing you can do with that

 

That looks good I never knew anyone did uprated planet gears
On my last cossie I had once I got it to squat hard I did 3 launches and broke 3 standard diffs, it was the planet gears everytime smashed them to bits, ime they are the weakest bit mate, I bought a gripper off jay after that happened

 

This is what I did with a gripper and r888’s coming off a roundabout in 2nd with no wheel spin lol

 

R888s ftw mate 😁👍
I didn't have them I was on good year eagles I think back then lol

 

Rang barra for a quote on a 9" last week 6800 kinel 😂 Ł250 10.5" jag ftw Cheers carl 👍

 

😁😁💪👌👍👍

 

The weak link is the planets for sure. Mine had so much play it was time for a upgrade before the planets let go and destroyed it completely.
That crown and pinion has not been set up correctly imo.

 

I didn't like the sound of a gripper as its harsh on corners etc. Great for launches etc tho.
Bara and Sean did a great job

 

Is this a 7" or 7.5"

 

I can assure you it was! That’s called grip torque and a small cwp. The planet gears are week definitely but at a certain point so is the cwp. I’m certainly not the first to do what I did! When I picked up my gripper I said to them will I brake it they said no your strip the teeth off the cwp next

 

Castrol B373 limited slip diff oil stops most of the noise with a Gripper and most other plate diffs and using a solid spacer correctly sized helps with stopping the cwp failing, instead of the collapsable original pre-load spacer.

Steve

 

Correct as they do this on the atlas axles new bearings set preload torque the strip measure collapsible spacer make new from EN16 refit and torque that nut up FT with some green loctite.

Which when you apply shit loads of power and torque the nut don't move altering the pinion pre load.

Everything can fail for sure but there is always a reason.

Anyway this wasn't ment to be a debate on failure it was about Bara Motorsport and the great job they did for me. 👍
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Good to hear. I will going to barra to get my supra diff rebuilt in the near future

 

Diff pins are weak, planet gears are weak. I'd expect them to break long before the CWP ( And friends have broke them )

 

I see this crowd in Serbia offer LSD units that look good, mainly for BMW but they do list 7 and 7.5" too.

https://racingdiffs.com/collections/...ution-lsd-unit

 

Why have you managed to break 0ne? Doubt you will tbh thier plenty man enough for your power

 

no but i dont think mine is very healthy. When i first put it in it was noisy and weaps oil from one of the shaft seals. Its not noisy now. I did a couple of oil changes on it got quite a bit of metal swarf out on the magnetic plug. It didnt look good. Handling wise at speed its awful compared to the standard Ford diff. It doesnt hold a line and wobbles about all over the place.

Anyway i like to do a job properly. So ive got a 6 degree adjustable rear beam modified to take the supra diff. Ive got a nice set of billet gold anodised rear hubs from anembo engineering. I will treat myself to a set of coilovers for christmas and when everything is being swapped over get the diff rebuilt. Then with a bit of setting up it will hopefully handle as well as an old sierra can. Then see mr Martin at reyland for some top notch ap brakes and with sticky tyres it should be a bit of a weapon.

 

Sounds good mate lovely motor your 3dr

 

Spot on Steve👍

 

On the tractors I run although it's called a crossshaft it's the same principal as a diff
Bearing preload and backlash is essential to longevity nearly 2000 lbft going through them 💪

 

i have a nos 7 inch 3.9 crown wheel and pinion and was wondering can anyone recommend who could heat treat /harden it to preserve its life a bit before I fit it

 

2nd gear on full boost and a hump in the road was all it took to break mine. Car went light the gripped again and no drive. I went the gripper route and a uprated 3.9 CWP and it's not aggressive and the only time I get noise is on full lock reversing in to the garage !