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Old 05-16-2014, 08:15 AM   #1
Glocksrox18
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Default LSD rear and diff ratio swaps

88 245 with a b230ft, hy35w, and soon to be t5z trans. The previous owner of the car swapped a g80 in but I still get one tire fire from a dead stop. I'm not even sure what ratio the rear is that he put in but for the hearing of the trans, I feel a 4.10 would be a perfect match.

Here are the ratios

1: 2.95
2: 1.94
3: 1.34
4: 1.00
5: 0.63

At 6800 rpm with 4.11 rear

1: 42 mph
2: 63 mph
3: 91 mph
4: 122 mph
5: 194 mph

My question is.. If I don't have a 4.11 rear right now, what parts would I need to swap it out? I'm looking into a Detroit locker or something aftermarket and strong. Not another g80. Other than the LSD itself... What parts do I need for the swap?

Thanks,
John
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Last edited by Glocksrox18; 05-16-2014 at 12:59 PM.. Reason: Typo
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Old 05-16-2014, 08:38 AM   #2
noz-e8tr
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Here is some good info. Perhaps it will have the stuff you are looking for..

Dave's Page
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Old 05-16-2014, 08:39 AM   #3
Lando
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Quote:
Originally Posted by Glocksrox18 View Post
88 245 with a b230ft, hy35w, and soon to be t5z trans. The previous owner of the car swapped a g80 in but I still get one tire fire from a dead stop. I'm not even sure what ratio the rear is that he put in but for the hearing of the trans, I feel a 4.11 would be a perfect match.

Here are the ratios

1: 2.95
2: 1.94
3: 1.34
4: 1.00
5: 0.63

At 6800 rpm with 4.11 rear

1: 42 mph
2: 63 mph
3: 91 mph
4: 122 mph
5: 194 mph

My question is.. If I don't have a 4.11 rear right now, what parts would I need to swap it out? I'm looking into a Detroit locker or something aftermarket and strong. Not another g80. Other than the LSD itself... What parts do I need for the swap?

Thanks,
John
Eaton TruTrac should bolt to any of the dana 30's. You will have to figure out a solution for your speedo tone ring. There is a thread on how to install a trutrac in the articles section.
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I didn't think there was anything to the whole 7/9 thing, but I have to say that my 745T is the only Volvo I've owned that blew up and self-immolated.

Last edited by Lando; 05-16-2014 at 08:57 AM..
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Old 05-16-2014, 10:14 AM   #4
tt460
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Originally Posted by Lando View Post
You will have to figure out a solution for your speedo tone ring.
I just got a TrueTrac and am going to be figuring out the tone ring. Are there any off-the shelf tone rings that I can buy to weld onto the diff or am I going to have to have to fab my own?
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Old 05-16-2014, 10:46 AM   #5
noz-e8tr
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Originally Posted by tt460 View Post
I just got a TrueTrac and am going to be figuring out the tone ring. Are there any off-the shelf tone rings that I can buy to weld onto the diff or am I going to have to have to fab my own?
Check out the link I gave above. Mikep was able to grove the TruTrac to work.


Quote:
Originally Posted by From Daves Page
"I cut grooves with a die grinder and cutoff wheel. It was so easy and worked so well that I only do it that way now. The grooves need not be wide. The count just has to be the same. I think it's 12 grooves for the speedo. I'm not sure of the count for ABS. You can adjust the clearance by sliding the cover up or down, or by using a press in extreme cases."
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Old 05-16-2014, 01:17 PM   #6
David244turbo
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Originally Posted by tt460 View Post
I just got a TrueTrac and am going to be figuring out the tone ring. Are there any off-the shelf tone rings that I can buy to weld onto the diff or am I going to have to have to fab my own?
there are speedo rings for those truetracs. you only have to order them. i dont know where YOU can get it from becouse in sweden i bought my truetrac + speedo ring from www.bakaxel.se

you just need to weld it on and push the sensor out some millimeters and it will work.

depending on if you got ABS or not there are 2 different. i used this http://bakaxel.se/hastighetsmatarkrans.html in my 240(no ABS)

this one is for the ones with ABS
http://bakaxel.se/hastighetsmatarkrans-279.html
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Old 05-16-2014, 01:42 PM   #7
tt460
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The grooved method is compelling... I never would have considered that before, but I think I'll be giving that a try. Either way it looks like I'd need to void the warranty of the diff by either welding or grinding on it.

And sorry for hijacking your thread Glocksrox... But I think the best option is a TrueTrac for a differential. The G80 is a really great daily-driver differential, but not a performance diff. A TrueTrac is a really strong no maintenance differential.
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Old 05-16-2014, 01:52 PM   #8
John V, outside agitator
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Originally Posted by tt460 View Post
The grooved method is compelling... I never would have considered that before, but I think I'll be giving that a try. Either way it looks like I'd need to void the warranty of the diff by either welding or grinding on it.

And sorry for hijacking your thread Glocksrox... But I think the best option is a TrueTrac for a differential. The G80 is a really great daily-driver differential, but not a performance diff. A TrueTrac is a really strong no maintenance differential.
But they "differentiate" pretty regularly when driving with any vigor like even hard cornering on dry..very readily on wet/loose...
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Old 05-16-2014, 02:01 PM   #9
Glocksrox18
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I'm looking to replace the blown g80 I have now with an upgraded diff. I'm hoping to find a 1031 rear and throw 4.10 gears in with a true track
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Old 05-16-2014, 03:14 PM   #10
John V, outside agitator
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Originally Posted by Glocksrox18 View Post
I'm looking to replace the blown g80 I have now with an upgraded diff. I'm hoping to find a 1031 rear and throw 4.10 gears in with a true track
You CAN shim the hell outta the tru-trac..Find the belleville wahers and shim 'em up.
Win win.
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