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Discussion Starter #1
Specifically, I'm wondering if there were ever any OEM applications that came with a 4.10 in the 210mm large case size (factory E39 M5 size). I'm aware that the 4.10 was available in this size from BMW Motorsport, but the price tag made my eyes roll back in my head.

I know that the E46 M3 guys ditch their 3.62s to go up to 4.10s, so there has to be a source out there.

I guess my other "cheap" option is a 3.91 gearset out of an E32, E34 M5, etc, but I don't know that it will be enough of a difference to be a drastic change.
 

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The only options are BMW Motorsport and aftermarket (if you think the BMW Motorsport prices are high don't even bother to look at the aftermarket), although the aftermarket does offer a 5.44 which will make you car unbelievably fast :eek: :rofl:







PLEASE NOTE THAT I DO NOT OWN AN M5 AND THIS POST IS NOT INTENDED TO BE ARROGANT. PLEASE READ THE IMPORTANT REVISED DISCLAIMER THAT APPLIES TO THIS POST
 

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Discussion Starter #3
yeah, i'm hoping to leave the line in 6th.

I will scour the M3 boards to see if any of those guys have gotten sick of theirs yet.
 

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Come on you two, there's got to be a perfectly good Chevy rear diff sitting around somewhere that you can throw in there. :D
 

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Specifically, I'm wondering if there were ever any OEM applications that came with a 4.10 in the 210mm large case size (factory E39 M5 size). I'm aware that the 4.10 was available in this size from BMW Motorsport, but the price tag made my eyes roll back in my head.

I know that the E46 M3 guys ditch their 3.62s to go up to 4.10s, so there has to be a source out there.

I guess my other "cheap" option is a 3.91 gearset out of an E32, E34 M5, etc, but I don't know that it will be enough of a difference to be a drastic change.
Dinan diff is only a 10% change. The 3.91 is about a 24% change. It will be more than noticeable!! Make sure you grease the shifter to make those lightning fast shifts!:1:

Tire Diameter 1: 25.7 inches
Rear Gear Ratio 1: 3.15:1

MPH
RPM 1st 2nd 3rd 4th 5th 6th
1000 6 10 15 20 24 29
1500 9 14 22 30 36 44
2000 11 19 29 39 49 58
2500 14 24 36 49 61 73
3000 17 29 44 59 73 88
3500 20 34 51 69 85 102
4000 23 38 58 79 97 117
4500 26 43 65 89 109 132
5000 29 48 73 99 121 146
5500 32 53 80 109 133 161
6000 34 58 87 118 146 175
6500 37 62 94 128 158 190
7000 40 67 102 138 170 205
7500 43 72 109 148 182 219
8000 46 77 116 158 194 234


Tire Diameter 2: 25.7 inches
Rear Gear Ratio 2: 3.91:1

MPH
RPM 1st 2nd 3rd 4th 5th 6th
1000 5 8 12 16 20 24
1500 7 12 18 24 29 35
2000 9 15 23 32 39 47
2500 12 19 29 40 49 59
3000 14 23 35 48 59 71
3500 16 27 41 56 68 82
4000 18 31 47 64 78 94
4500 21 35 53 72 88 106
5000 23 39 59 79 98 118
5500 25 43 64 87 108 130
6000 28 46 70 95 117 141
6500 30 50 76 103 127 153
7000 32 54 82 111 137 165
7500 35 58 88 119 147 177
8000 37 62 94 127 156 188


Regards,
Jerry
 

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I am running a Tremec T56 which has much, much taller gearing than the M5 Getrag

also already have 3.62s from an E46 M3.
Well, then you will have about 8% change with 3.91, about 13% with 4.10. 8% would be similar change at the rear as the guys going from 3.15 to Dinan 3.45.

Regards,
Jerry
 

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I can imagine how hard/expensive it is to source these gears. I've spent the last 2 months trying to get a nice rebuilt 3.46 LSD for my E36 M3. Local diff shop told me I needed to find the gears for them to help me out.

They do have used gears on eBay... obviously a risk but may be worth looking into.
 

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Discussion Starter #9
So far I am finding that the only US market cars that had a 3.91 gear in a 210mm size are the E34 M5 before a certain production date, as well as X5 (4.6is and 4.8is). The hunt goes on...
 
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