3.7 ratio diffs

[GFORCE1320]

Who would be interested in some 3.7 ratio diff assemblies?
These would be the complete center sections ready to bolt in (case, diff, gears, ect..)
I still need to get a good shipping cost, price would be right at about $1,000. before shipping.

Thanks
Chris

[r33pwrd]

If 3.7 is thought to be a good ratio im in...

[99-LS1-SS]

It's the ratio that the manual transmission GXP's have. The automatic GXP's have the 3.27. Whether it's a good ratio or not depends on what you are looking for.

[GRRRR8]

For a M6 it is. Very steep for an auto in a DD. Probably OK with a 28in tire in a highly modded N/A car. 3.27-3.45 would be a better choice.

[GFORCE1320]

The 3.91 and 3.73 ratios are popular in the GTO world, both in the auto and manual cars.

[r33pwrd]

so dumd question... do the GXP and GT share the same rear diff housing?

[GFORCE1320]

I dont see why the wouldnt. If they come out with a different diff housing then it would explain why GM is broke, LOL

[GRRRR8]

The G8s have a 4.02 1st gear ratio with a 6 speed auto. The housings are the same. GXP gets 3.27 with the A6 and 3.70 with the M6.

[GFORCE1320]

I hope to have these on my web site within the next day or 2. I just need to get the shipping cost locked down.

[GeorgeInNePa]

They have to be 3.70s? You'll move 3.27s and 3.45 much quicker.

[r33pwrd]

They have to be 3.70s? You'll move 3.27s and 3.45 much quicker.

could you even notice the difference for 3.45 to 3.70? (I have never messed with a rear diff before so im not sure on how it makes the car feel)

[GFORCE1320]

These happen to be only available in 3.70

[Ktlplxm]

They have to be 3.70s? You'll move 3.27s and 3.45 much quicker.

Produce a 3.27 and I'm in.

[r33pwrd]

Produce a 3.27 and I'm in.

Isnt that what the GXP has??

[GRRRR8]

Isnt that what the GXP has??

Correct, with the A6.

[Got 8?]

3.70 would be too much for the 6sp auto. The first gear is too steep. Why do you think the auto and manual GXP's run the same times w/ different axle ratios ??? It would be like putting 4.56's or 5.13 in with a M6 gearbox...Probably great for the 1/8 mile IF you could hook up but not much good for anything else...

[G8GT594]

3.27.... 3.7 is a little much for my taste and my car isn't even a DD.

[PontiacDan]

I run 4.30s in my DD mustang without any problems. I think 3.70 would be a nice gear for these cars

[GFORCE1320]

The guys in Australia love the 3.70 gears, but I'm not sure what ratios they have in the transmissions.

[RB Designs]

I think the A6 cars are geared perfectly as is, money would be better spent on a billet convertor .

[GRRRR8]

I run 4.30s in my DD mustang without any problems. I think 3.70 would be a nice gear for these cars

I had 4.30s in mine too, but the T45 gears ratios are not even close to the same. 3.70s with the stock 19s and basically stock motor would be like a granny gear in 1st. You would be shifting instantly. They put 3.27s in the auto GXP for that reason. You would need a decent amount of mods just to use a 3.45 gear and shifting at 6800 to make it worth while.

[PontiacDan]

yeah, I know its completely different cars, but just imagine if you had the whole center section, swap it out in a couple hours, bolt on the 3.7 center chunck with a pair of slicks at the drag strip--should see some decent times/gains

[GRRRR8]

yeah, I know its completely different cars, but just imagine if you had the whole center section, swap it out in a couple hours, bolt on the 3.7 center chunck with a pair of slicks at the drag strip--should see some decent times/gains

With a 28in tire it would fly for sure!

[G8GXP4now]

Can't you just launch from 2nd gear if you get a steep enough rear?

[GRRRR8]

It defeats the purpose. Now your 2nd gear ratio is higher.

[r33pwrd]

Can't you just launch from 2nd gear if you get a steep enough rear?

I would thing maybe in a super high HP car this might be worth while.

[r33pwrd]

so whom is gonna be the dummy car to try this? If I had slick I would try in a second but slick wont come until spring when track opens.