CV8 gear ratios

[sheepdip]

Hi All

The Escort LS1 has now blown up the standard cossie diff - no suprise. So now building one with a Gripper diff, but need to know what the standard gearbox ratios are for the 04 CV8 to help me pick the correct ratio.

[leigh1050]

I think the ratios are in F.A.Q's.

[Xpuffin]

M6
2.66
1.78
1.3
1.0
.74
.50

Edited by Xpuffin on Monday 19th January 15:59

[MyM8V8]

sheepdip said:

Hi All

The Escort LS1 has now blown up the standard cossie diff - no suprise. So now building one with a Gripper diff, but need to know what the standard gearbox ratios are for the 04 CV8 to help me pick the correct ratio.

What do you want to do, cruise or go?

Cruise 3.46, go 3.91 in between 3.73

[KMud]

MyM8V8 said:

What do you want to do, cruise or go?

Cruise 3.46, go 3.91 in between 3.73

On something as light as an escort I could see the 3.46s and CV8 ratios working fine, nice cheap option

[MyM8V8]

KMud said:

MyM8V8 said:

What do you want to do, cruise or go?

Cruise 3.46, go 3.91 in between 3.73

On something as light as an escort I could see the 3.46s and CV8 ratios working fine, nice cheap option

Doubt he'll be using a Holden diff centre though?

[KMud]

MyM8V8 said:

Doubt he'll be using a Holden diff centre though?

Good point, I'll go back to sleep!

[raving]

You would be far better off in the long run to junk the Cossie diff , immaterial if its a 7" or 7.5" as it will s**t itself again

Best thing to do is use a mk3 Supra , good lsd standard , pretty bomb proof & good ratios available


G284 = 4.30:1 4-pinion 8.0" pre-89 N/A Diff (no-LSD, USA Only)
G282 = 4.30:1 2-pinion 8.0" 89+ N/A Diff (no-LSD, USA Only)
G285 = 4.30:1 4-pinion 8.0" N/A Diff (with-LSD)
G315 = 3.91:1 4-pinion 8.0" pre-89 Turbo Diff (with-LSD)
G305 = 3.73:1 4-pinion 8.0" 89+ Turbo Diff (with-LSD)

Adaptors available for ford frames as well & shafts

[sheepdip]

Thanks for the info folk.
I have considered the supra diff but I have heard some bad reports. I would need the early plate type but with a later ratio. Fitting it would just be a fabrication job - just like fitting the cossie was into the mk2 shell. But if I go for the cossie with a gripper I get the correct ratio and a life time promise! I know the Gripper is expensive but they loose next to nowt if I need to sell it on.
But if someone has a cheap supra unit for sale!

[stevieturbo]

sheepdip said:

Thanks for the info folk.
I have considered the supra diff but I have heard some bad reports. I would need the early plate type but with a later ratio. Fitting it would just be a fabrication job - just like fitting the cossie was into the mk2 shell. But if I go for the cossie with a gripper I get the correct ratio and a life time promise! I know the Gripper is expensive but they loose next to nowt if I need to sell it on.
But if someone has a cheap supra unit for sale!

MK Motorsport sells kits to install the Supra diff in place of a Sierra diff, so presumably that kit would make fitment into your car easier.

Although I'd think a gripper in a 7.5" with a relatively lightweight chassis should survive quite well.
Especially if your existing CWP is already 7.5" and you're just putting the gripper into it.

[sheepdip]

That another point - weight. I think the supra diff is at least 45kg and the cossie is 25kg

[MyM8V8]

sheepdip said:

That another point - weight. I think the supra diff is at least 45kg and the cossie is 25kg

There will be a reason for that.

Holden is 38.5 kgs. (Not that it matters if it is attached to the chassis as an IRS-Total sprung weight)

[raving]

If you get good grip & are running any decent torque the 7.5 Cwp will go , I broke them with ease in my Sierra with a Small Block in it

You could also use Jag

[sheepdip]

Looking at Supra diff - conversion adaptors look good. But can you get a ratio of about 3.3?

[raving]

sheepdip said:

Looking at Supra diff - conversion adaptors look good. But can you get a ratio of about 3.3?

Why do you want one that low?

I would have thought in a Escort top speed was not the goal so a 3.7 or 3.9 for better accel

[stevieturbo]

Given vehicle weight and power etc. 3.3 does sound rather low ?

I'd doubt a Supra diff would ever be that low given their application.

There will be more threads here on the topic though

http://passionford.com/forum/general-car-related-d...

http://passionford.com/forum/general-car-related-d...

http://passionford.com/forum/general-car-related-d...

[sheepdip]

I would agree that 3.9 should be better for ultimate acceleration but as the table of speeds in gears shows there is a huge jump from 4 to 5 so I has hoping to not use 5 if possible and it would also make 1st more usable. But I may just go for the 3.9 supra and see how much of the drop off is reduced between 4 and 5. First would become redundant.

[stevieturbo]

sheepdip said:

I would agree that 3.9 should be better for ultimate acceleration but as the table of speeds in gears shows there is a huge jump from 4 to 5 so I has hoping to not use 5 if possible and it would also make 1st more usable. But I may just go for the 3.9 supra and see how much of the drop off is reduced between 4 and 5. First would become redundant.

So you're trying to optimise for drag racing, or other ?

I guess you're using small tyres ?

Are you looking an easy swap, or prepared to do work ?

ie Ford 8.8" IRS you can get in 3.27 ( I run this ratio )

Or lots of BMW diffs available ? Some of them have tall diffs, often because they strangely run a 1:1 5th or 6th gear.

http://www.bokchoys.com/differential/GearRatios.ht...

[stevieturbo]

Just a pity postage would be a killer

http://www.ebay.com/itm/8-8-IRS-Rearend-assembly-9...



http://www.ebay.com/itm/03-04-FORD-MUSTANG-COBRA-I...

Would love to change my rear to an IRS