Pontiac Solstice Forum banner

1 - 20 of 25 Posts

·
Registered
Joined
·
4 Posts
Discussion Starter #1
I would like some input from Mallett owners or those with a V8 and AR5 combination. I have a LS1/AR5 Solstice with the factory 3.91 rear end. First gear is useless. Can anyone with a different rear end gearing give me some feedback? I am considering 3.42 or 3.23 gears to make first gear useable. I appreciate your input.
 

·
Super Moderator
Joined
·
5,951 Posts
How does your car do launching in second? The 3.91 gives you 557 RPM at 5 MPH in second gear, the 2.73 gives you 645 in first.
 

·
Premium Member
Joined
·
1,942 Posts
I have the 3.42 in mine and feel 1st is pretty much useless, except at low rpm's. I am considering the 3.23's also. I am not racing mine, but would like to be able to use 1st gear. Still working on figuring mine out, so not much help to anyone.
 

·
Registered
Joined
·
3,397 Posts
Not sure what ratios in my CTS diff. The T56 is not much good in first, but workable. Find I can drive in 4th through town at about 40mph so, have considered a taller ratio diff.

On the other hand, I cruise at around 2000 rpm at 70 mph in 6th and need to downshift to 5th if the speed limit calls for 55mph
 

·
Super Moderator
Joined
·
5,951 Posts
Not sure what ratios in my CTS diff. The T56 is not much good in first, but workable. Find I can drive in 4th through town at about 40mph so, have considered a taller ratio diff.

On the other hand, I cruise at around 2000 rpm at 70 mph in 6th and need to downshift to 5th if the speed limit calls for 55mph
Although the relative span from 1st to 6th in the T56 is roughly the same as the relative span from 1st to 5th in the AR5, depending on which T56 you have the overall range of ratios is either a little or a lot taller.
 

·
Registered
Joined
·
1,158 Posts
3.23 would be most beneficial.
 

·
Registered
Joined
·
4 Posts
Discussion Starter #9
Thanks for your input. I am looking for a 3.23 CTS rear carrier from a local boneyard and adding a Quaife differential to that as 3.23s don't appear to come with a LSD.
 

·
Registered
Joined
·
459 Posts
I have 3.23 with LSD and it is great. All of my gears are usable and I am barely over 2000rpm at 80 mph. I am quite able to smoke the tires in first and second gear, if I had a reason. (which I don,t). Here is a video of Dave from DDM testing my car with 3.23 differential.

https://www.youtube.com/watch?v=trvI32NgLZY

(copy and paste into browser)
 

·
Premium Member
Joined
·
1,942 Posts
Thanks for that information JohnWR. I will check with my dealer and see if I can order one as soon as I get the smog and registration done.
 

·
Registered
Joined
·
1,158 Posts
Would be able to find the CTS/STS/etc rear end on Ebay for $300 or so.
 

·
Premium Member
Joined
·
114 Posts
Thanks for your input. I am looking for a 3.23 CTS rear carrier from a local boneyard and adding a Quaife differential to that as 3.23s don't appear to come with a LSD.
The Hollander # is 440-01415 3.23 GU5 with LSD G80.
Search Google or eBay w/ description. There are also GU5 w/o G80.
 

·
Registered
Joined
·
1,113 Posts

·
Registered
Joined
·
1,158 Posts
I have never seen a failure in the actual differential mechanism, so to say the quaife is much stronger is a fallacy. It's probably more effective, depending on the intended use of the car, but it isn't necessarily stronger.
 

·
Registered
Joined
·
1,113 Posts

·
Super Moderator
Joined
·
15,965 Posts
I have read of axle failures. And read of differential failures in non-modified cars. But its news to me to see your post Yogi.

Thanks for keeping us informed.
 

·
Registered
Joined
·
1,113 Posts
I have read of axle failures. And read of differential failures in non-modified cars. But its news to me to see your post Yogi.

Thanks for keeping us informed.
You're quite welcome, Rob. I wish that I could've found the more recent photos.

Yogi
 
1 - 20 of 25 Posts
Top