ok boys i just got a t56 minus the bell housing for 450 needs new synchronickers/blocking rings what ever there called but all i know is almost everyone i find needs them might be the fact the stockers are made from paper

as some may know my avalanche is ridin on 37in kumho directional mud terrains woo hoo

i notice alot of guys are running 5.13s and 4.88s in there trucks but thats with a stock size tire

so what should i run on my avalanche lowest i can find for even a 14bolt is 5.38s which i think is still to high so i know this sounds a little extreme but i can usually find rockwell rears on the cheap i think around $500 or so so how would a 6.72 do??? and i dont think ill have to worry bout blowing that up

dam this truck is getting expensive

 

RPM 1st Gear 2nd Gear 3rd Gear 4th Gear 5th Gear 6th Gear
500 3 5 6 8 11 16
600 4 6 8 10 13 20
700 4 6 9 11 15 23
800 5 7 10 13 18 26
900 6 8 11 15 20 29
1000 6 9 13 16 22 33
1100 7 10 14 18 24 36
1200 7 11 15 20 27 39
1300 8 12 16 21 29 43
1400 9 13 18 23 31 46
1500 9 14 19 25 33 49
1600 10 15 20 26 35 52
1700 10 16 21 28 38 56
1800 11 17 23 29 40 59
1900 12 17 24 31 42 62
2000 12 18 25 33 44 66
2100 13 19 26 34 46 69
2200 14 20 28 36 49 72
2300 14 21 29 38 51 75
2400 15 22 30 39 53 79
2500 15 23 32 41 55 82
2600 16 24 33 43 58 85
2700 17 25 34 44 60 88
2800 17 26 35 46 62 92
2900 18 27 37 48 64 95
3000 18 28 38 49 66 98
3100 19 29 39 51 69 102
3200 20 29 40 52 71 105
3300 20 30 42 54 73 108
3400 21 31 43 56 75 111
3500 22 32 44 57 77 115
3600 22 33 45 59 80 118
3700 23 34 47 61 82 121
3800 23 35 48 62 84 124
3900 24 36 49 64 86 128
4000 25 37 50 66 89 131
4100 25 38 52 67 91 134
4200 26 39 53 69 93 138
4300 26 40 54 70 95 141
4400 27 40 55 72 97 144
4500 28 41 57 74 100 147
4600 28 42 58 75 102 151
4700 29 43 59 77 104 154
4800 30 44 60 79 106 157
4900 30 45 62 80 108 161
5000 31 46 63 82 111 164
5100 31 47 64 84 113 167
5200 32 48 66 85 115 170
5300 33 49 67 87 117 174
5400 33 50 68 88 120 177
5500 34 51 69 90 122 180
5600 34 52 71 92 124 183
5700 35 52 72 93 126 187
5800 36 53 73 95 128 190
5900 36 54 74 97 131 193
6000 37 55 76 98 133 197

 

they make a 7.17 gear for the dana 70s i think this will be alot easier to fit in the avi

RPM 1st Gear 2nd Gear 3rd Gear 4th Gear 5th Gear 6th Gear
500 3 4 6 8 10 15
600 3 5 7 9 12 18
700 4 6 8 11 15 21
800 5 7 9 12 17 25
900 5 8 11 14 19 28
1000 6 9 12 15 21 31
1100 6 9 13 17 23 34
1200 7 10 14 18 25 37
1300 8 11 15 20 27 40
1400 8 12 17 21 29 43
1500 9 13 18 23 31 46
1600 9 14 19 25 33 49
1700 10 15 20 26 35 52
1800 10 16 21 28 37 55
1900 11 16 22 29 39 58
2000 12 17 24 31 41 61
2100 12 18 25 32 44 64
2200 13 19 26 34 46 68
2300 13 20 27 35 48 71
2400 14 21 28 37 50 74
2500 14 22 30 38 52 77
2600 15 22 31 40 54 80
2700 16 23 32 41 56 83
2800 16 24 33 43 58 86
2900 17 25 34 45 60 89
3000 17 26 35 46 62 92
3100 18 27 37 48 64 95
3200 18 28 38 49 66 98
3300 19 28 39 51 68 101
3400 20 29 40 52 71 104
3500 20 30 41 54 73 107
3600 21 31 43 55 75 111
3700 21 32 44 57 77 114
3800 22 33 45 58 79 117
3900 23 34 46 60 81 120
4000 23 34 47 61 83 123
4100 24 35 48 63 85 126
4200 24 36 50 64 87 129
4300 25 37 51 66 89 132
4400 25 38 52 68 91 135
4500 26 39 53 69 93 138
4600 27 40 54 71 95 141
4700 27 41 56 72 98 144
4800 28 41 57 74 100 147
4900 28 42 58 75 102 150
5000 29 43 59 77 104 154
5100 29 44 60 78 106 157
5200 30 45 61 80 108 160
5300 31 46 63 81 110 163
5400 31 47 64 83 112 166
5500 32 47 65 84 114 169
5600 32 48 66 86 116 172
5700 33 49 67 88 118 175
5800 33 50 68 89 120 178
5900 34 51 70 91 122 181
6000 35 52 71 92 124 184

 

Honestly, you'd be better off with a NV4500 with that tire. The T56 is a close ratio car transmission and is a stretch for a regular 1/2 ton truck to run but can be done. In your case, you just need a lower first and second gear. You can't really get a low enough rear gear (within reason).
Without all the axle swapping, as you've said. Just be much more financially to your advantage to stay away from the T56.

 

no matter what tranny i go with the stock axle is going to take a dive with my foot already blew one up so im thinkin about the dana 70 with 7.17s or a 9in

the truck shouldnt weigh much when done considering all thats being removed and replace with lightweight material
interior-aluminum racing aluminum sheetmetal dash door panels and so on
motor-aluminum block
body-fiberglass grill fenders hood quarters most of the bed will be cut out