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Home / Transmissions / Aisin Warner / 55-51SN
Aisin Warner Source-verified model

Aisin Warner 55-51SN Transmission

Speeds 5
Drive FWD/AWD
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55-51SN
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Support & Market Presence Index

How widely this transmission is used, documented and supported across the Go4Trans graph.

6resources
Diagram Parts Fitment Aliases Symptoms Related Sources Contribute

Exploded diagram & parts

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699 699 · No. 1 283 283 · No. 2 796 796 · No. 3 282 282 · No. 4 274 274 · No. 5 273* 273* · No. 6 730 730 · No. 7 690 690 · No. 8 281 281 · No. 9 280 280 · No. 10 869 869 · No. 11 712 712 · No. 12 280 280 · No. 13 696 696 · No. 14 281 281 · No. 15 586 586 · No. 16 185 185 · No. 17 185 185 · No. 18 284 284 · No. 19 20 20 · No. 20 596/868 596, 868 · No. 21 864 864 · No. 22 142* 142* · No. 23 122/102 122, 102 · No. 24 865 865 · No. 25 981 981 · No. 26 961 961 · No. 27 330 330 · No. 28 331 331 · No. 29 040 040 · No. 30 040 040 · No. 31 551 551 · No. 32 022 022 · No. 33 246 246 · No. 34 587 587 · No. 35 246 246 · No. 36 247 247 · No. 37 750 750 · No. 38 698 698 · No. 39 492 492 · No. 40 776 776 · No. 41 906 906 · No. 42 908 908 · No. 43 077 077 · No. 44 291 291 · No. 45 292 292 · No. 46 716 716 · No. 47 720 720 · No. 48 786 786 · No. 49 289 289 · No. 50 288 288 · No. 51 290* 290* · No. 52 076 076 · No. 53 597 597 · No. 54 249* 249* · No. 55 248* 248* · No. 56 892 892 · No. 57 150* 150* · No. 58 130/110 130, 110 · No. 59 854 854 · No. 60 893 893 · No. 61 976 976 · No. 62 966 966 · No. 63 341 341 · No. 64 340 340 · No. 65 789 789 · No. 66 998/378 998, 378 · No. 67 999 999 · No. 68 999 999 · No. 69 886/362 886, 362 · No. 70 906B 906B · No. 71 195 195 · No. 72 907 907 · No. 73 410 410 · No. 74 909 909 · No. 75 896 896 · No. 76 070 070 · No. 77 034 034 · No. 78 79 79 · No. 79 530 530 · No. 80 544 544 · No. 81 520 520 · No. 82 311 311 · No. 83 037 037 · No. 84 037 037 · No. 85 332/333 332, 333 · No. 86 962AA 962AA · No. 87 874 874 · No. 88 962 962 · No. 89 982 982 · No. 90 124/104 124, 104 · No. 91 144 144 · No. 92 873 873 · No. 93 340 340 · No. 94 341 341 · No. 95 969 969 · No. 96 989 989 · No. 97 871 871 · No. 98 132/112 132, 112 · No. 99 152 152 · No. 100 870 870 · No. 101 211 211 · No. 102 579 579 · No. 103 219 219 · No. 104 652 652 · No. 105 652 652 · No. 106 652 652 · No. 107 572 572 · No. 108 438 438 · No. 109 777 777 · No. 110 778 778 · No. 111 072 072 · No. 112 294 294 · No. 113 010/379 010, 379 · No. 114 221 221 · No. 115 710 710 · No. 116 279 279 · No. 117 696B 696B · No. 118 711 711 · No. 119 277 277 · No. 120 760 760 · No. 121 795 795 · No. 122 883 883 · No. 123 338 338 · No. 124 339 339 · No. 125 967 967 · No. 126 987 987 · No. 127 884 884 · No. 128 155 155 · No. 129 134/114 134, 114 · No. 130 154 154 · No. 131 885 885 · No. 132 664 664 · No. 133 886 886 · No. 134 654 654 · No. 135 654 654 · No. 136 654 654 · No. 137 255 255 · No. 138 254 254 · No. 139 256 256 · No. 140 889 889 · No. 141 604 604 · No. 142 594 594 · No. 143 251 251 · No. 144 058 058 · No. 145 058 058 · No. 146 584 584 · No. 147 592 592 · No. 148 239 239 · No. 149 238 238 · No. 150 428 428 · No. 151 344 344 · No. 152 344 344 · No. 153 740 740 · No. 154 916 916 · No. 155 446 446 · No. 156 991-6 991-6 · No. 157 991-2 991-2 · No. 158 991-7 991-7 · No. 159 602 602 · No. 160 236 236 · No. 161 882 882 · No. 162 235 235 · No. 163 888 888 · No. 164 056 056 · No. 165 614 614 · No. 166 056 056 · No. 167 240 240 · No. 168 241 241 · No. 169 052 052 · No. 170 612 612 · No. 171 052 052 · No. 172 234 234 · No. 173 876 876 · No. 174 148* 148* · No. 175 128/108 128, 108 · No. 176 878 878 · No. 177 146* 146* · No. 178 126/106 126, 106 · No. 179 858 858 · No. 180 879 879 · No. 181 985 985 · No. 182 965337 965337 · No. 183 965337 965337 · No. 184 964 964 · No. 185 425 425 · No. 186 435 435 · No. 187 994 994 · No. 188 991-4 991-4 · No. 189 780 780 · No. 190 301/766 301, 766 · No. 191 746 746 · No. 192 430 430 · No. 193 423/421 423, 421 · No. 194 440 440 · No. 195 422 422 · No. 196 995-2 995-2 · No. 197 995-3 995-3 · No. 198 995-1 995-1 · No. 199 200 200 · No. 200 201 201 · No. 201 334 334 · No. 202 335 335 · No. 203 554 554 · No. 204 181 181 · No. 205 231* 231* · No. 206 232/231* 232, 231* · No. 207 233 233 · No. 208 223/344 223, 344 · No. 209 934 934 · No. 210 353 353 · No. 211 931 931 · No. 212 932 932 · No. 213 191 191 · No. 214 344 344 · No. 215 759 759 · No. 216 788 788 · No. 217 999 999 · No. 218

Parts categories

View all parts →
Kits
Kits
35 parts
Valve body & solenoids
Valve body & solenoids
26 parts
Electrical
Electrical
6 parts
Filters & pans
Filters & pans
5 parts
Seals & gaskets
Seals & gaskets
25 parts
Bushings, bearings & thrust
Bushings, bearings & thrust
53 parts
Bands & servos
Bands & servos
5 parts
Pump
Pump
6 parts
Friction & steel
Friction & steel
50 parts
Planetary & hard parts
Planetary & hard parts
66 parts
Hardware & other
Hardware & other
40 parts
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Vehicle fitment explorer

Confirmed vehicle applications. Every row is drawn from our source-verified fitment database.

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Common problems & symptoms

Problems and symptoms reported for this transmission, compiled from repair sources. Not a complete list.

?
TCC RPM fluctuation / overheated fluid
Because lube/TCC pressure is comparatively low in this unit, the converter clutch can stay fully applied at low speed and high load, overtaxing the fluid and lining and producing break-away slip or RPM fluctuation.
!
Solenoid modulator valve bore wear
The solenoid modulator bore that feeds and limits pressure to the linear solenoids wears, showing a moon-shaped discoloration, similarly to a worn actuator feed circuit, degrading pressure control.
!
Secondary regulator valve bore wear
Wear at the secondary regulator valve bore near the spring/spool surface can raise SLT pressure abnormally and cause harsh Reverse engagement.
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Sources & Contribution

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Every claim on this page is backed by a structured source record — including community contributions, each with its own reference.

Type
Title
Author
Link
manual
AW55-50SN/55-51SN ZIP Kit Installation & Testing Booklet (Sonnax)
—
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other
55-50SN / 55-51SN (AF23/AF33/RE5F22A) Exploded Parts Catalog
—
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link
AW 55-50 / AF23-33: Diagnosis and Valve Body Information (Sonnax)
—
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link
Aisin AW 55-50SN, 55-51SN Valve Body Layout (Sonnax)
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link
Troubleshooting the AW 55-50SN Family (Sonnax)
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link
Aisin AW 55-51SN Transmission Symptom & Parts Reference (Sonnax)
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✓ Reviewed by our editorial team before going live
✓ Accepted contributions are credited in the Sources list
📋 Alias or code variant
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