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Differential Identification AAM 9.25 Image Differential Identification AAM 10.5 Image Differential Identification AAM 11.5 Image
AAM 9.25" Chrysler Front
AAM 10.5″ Chrysler
AAM 11.5″ GM / Chrysler
AMC Model 20
       
Chrysler 8 inch IFS Front Differential
AMC Model 35
Chrysler 7.25″
Chrysler 8″ IFS
Chrysler 8.25″
       
Chrysler Dodge Plymouth 8.75 Third Member Dana-28-Differential
Chrysler 8.75″
Chrysler 9.25″
Dana 28™
Dana 30™
       
Dana 44™
Dana 50™
Dana 60™
Dana 70™
       
Dana S110 Differential Parts Ford 8 inch 3rd member Dropout Differential
Dana 80™
Dana S110
Ford 7.5″
Ford 8″ 3rd Member
       
Ford 8.8″
Ford 9″ 3rd Member
Ford 9.75″
 Ford 10.25″ & 10.5″
       
GM '55 Passenger 3rd Member Differential GM '55 Truck 3rd Third Member Dropout GM 7.25
GM ’55 Passenger
GM ’55 Truck
GM 7.25″ IFS
GM 7.5″/7.625″
       
8.2' BOP B.O.P. Differential Chevy Blazer Tahoe Suburban Avalanche Silverado Escalade GMC Yukon K10 K25 Sierra Envoy Front Differential
GM 8″
GM 8.2″
GM 8.2″ B.O.P.
GM 8.25″ IFS
       
GM 8.5″
GM 8.625″
GM 12 Bolt Passenger Car (8.875″)
GM 12 Bolt Truck (8.875″)
       
Chevy Avalanche Express Van Hummer H2 GMC K20 K35 Silverado Yukon Sierra Suburban Front IFS Differential Chevy Avalanche Silverado Tahoe Suburban C15 C25 Express Van GMC Sierra Yukon K10 K25 Hummer H2 Rear Differential
GM 9.25″ IFS 
GM 9.5″ 
GM 10.5″ 14 Bolt
Toyota Landcruiser
       
Toyota 7.5 Toyota 8 Toyota Landcruiser 8 Toyota Landcruiser 9.5
Toyota 7.5″
 Toyota 8″
 Toyota Landcruiser 8″ 
 Toyota Landcruiser 9.5″
       
Toyota 7.5 Reverse IFS Clamshell Differential Toyota 8 Toyota-Landcruiser-8-Reverse-IFS-Front Differential Toyota 8.75
Toyota 7.5″ IFS Front
 Toyota 8″ Rear Tacoma/ T100
 Toyota Landcruiser 8″ Reverse IFS 
 Toyota Landcruiser 8.75″ Reverse IFS
     

DANA AXLE IDENTICATION

 

EATON HEAVY AXLE SHAFT IDENTIFICATION 

 eaton-axle-id.png

 

measure-axles.jpg

 

Gear Ratio vs Tire Size

When you change your tire size you need to make sure you have the right gearing to get optimal fuel economy or power.  Here at Drivetrain America we have a chart to help you decide what is on the best gearing for your application. 

These calculations are assuming a manual transmission at 65 MPH with a gear ratio of 1:1. If you drive an automatic your RPMs will be slightly higher, and if you have overdrive your RPMs will be slightly lower.

 
3.31
3.42
3.55
3.73
3.91
4.11
4.27
4.56
4.88
5.13
5.29
5.38
5.71
6.17
7.17
27"
2677
2766
2872
3017
3163
3325
3454
3689
3947
4150
4279
4352
4619
4991
5800
28"
2582
2668
2769
2909
3050
3206
3331
3557
3806
4001
4126
4196
4454
4813
5593
29"
2493
2576
2674
2809
2945
3095
3216
3434
3675
3863
3984
4052
4300
4647
5400
30"
2410
2490
2584
2715
2846
2992
3109
3320
3553
3735
3851
3917
4157
4492
5220
31"
2332
2409
2501
2628
2755
2896
3008
3213
3438
3614
3727
3790
4023
4347
5051
32"
2259
2334
2423
2546
2696
2805
2914
3112
3331
3501
3610
3672
3897
4211
4894
33"
2191
2263
2349
2469
2588
2720
2826
3018
3230
3395
3501
3561
3779
4093
4745
34"
2126
2197
2280
2396
2512
2640
2743
2929
3135
3295
3398
3456
3668
3963
4606
35"
2065
2134
2215
2328
2440
2565
2664
2845
3045
3201
3301
3357
3563
3850
4474
36"
2008
2075
2154
2263
2372
2493
2590
2766
2961
3112
3209
3264
3464
3743
4350
37"
1954
2019
2095
2203
2308
2426
2520
2692
2881
3028
3123
3176
3370
3642
4243
38"
1902
1966
2040
2144
2247
2362
2454
2621
2805
2948
3040
3092
3282
3546
4121
39"
1854
1915
1988
2089
2190
2302
2391
2554
2733
2873
2962
3013
3198
3455
4015
40"
1807
1867
1938
2037
2135
2244
2331
2490
2664
2801
2888
2937
3118
3369
3915
41"
1763
1822
1891
1987
2083
2189
2275
2429
2599
2733
2818
2866
3042
3287
3819
42"
1721
1778
1846
1940
2033
2137
2220
2371
2538
2668
2751
2798
2969
3208
3728
43"
1681
1737
1803
1894
1986
2087
2169
2316
2479
2606
2687
2733
2900
3134
3642
44"
1643
1698
1762
1851
1941
2040
2119
2263
2422
2546
2626
2670
2834
3063
3559

 

Here's a formula you can use to calculate your vehicle's tire diameter:

(CROSS SECTION WIDTH x 0.ASPECT RATIO x 2 ÷ 25.4) + WHEEL DIAMETER = OVERALL TIRE DIAMETER

For Example: 235/45ZR-1 (235 x 0.45 x 2 ÷ 25.4) + 17 = 25.327"

And here's a formula that you can use to calculate your vehicle's rear axle gear ratio:

RING GEAR TOOTH COUNT ÷ PINION GEAR TOOTH COUNT = GEAR RATIO

For example: 41-tooth ring gear ÷ 10-tooth pinion gear = 4.10

Set-up Specifications

  DIFFERENTIAL PINION BEARING PRELOAD 2 CUT 5 CUT R.G.BOLT BEARING CAP
  MODEL NEW USED BACKLASH BACKLASH TORQUE TORQUE
    (Inch Pounds) (.001 inch) (.001 inch) (Foot lbs) (Foot lbs)
AMC
  MODEL 20 14-19 6-8   6-10 65 65
  MODEL 35 (Dana 35) 12-15 6-7   6-10 55 55
               
CHRYSLER
  7.25″ 12-14 6-7   6-10 55 50
  8″ IFS 12-15 6-8 4-8 6-10 55 60
  8.25″ 12-15 6-8 4-8 6-10 55 60
  8.75″ ’41’ 13-15 6-8   6-10 55 90
  8.75″ ’42’ 15-25 7-10   6-10 55 90
  8.75″ ’89’ 14-19 6-9   6-10 55 90
  9.25″ REAR 14-19 6-9 5-9 6-10 65 75
  9.25″ ZF REAR 17-22 7-10 5-9   165 100
  AAM 9.25 FRONT  15-25 10-20 5-7   103 63
  AAM 10.5″ 15-25 8-11 5-7 6-10 175 120
  AAM 11.5″ 20-30 8-11 5-7 6-10 175 200
               
DANA SPICER
  DANA 25 12-15 6-7   6-10 55 50
  DANA 27 12-15 6-7   6-10 55 50
  DANA 28 10-13 5-6   6-10 55 50
  DANA 30 12-15 6-8   6-10 55 60
  DANA 30 JK 12-15 6-8   6-10 80 60
  DANA 44 14-19 6-9   6-10 55 60
  DANA 44 JK 22-35 12-15   6-10 135 80
  DANA 50 14-19 6-9   6-10 65 60
  DANA 60,61,70U 17-30 8-10   6-10 110 80
  DANA 70 & 70HD 20-35 8-10   6-10 110 80
  DANA 80 25-40 9-11   4-10 175 80
  S110, S111, S130, S132 20-40 8-12   9-16 150 140
  S135 10-40 8-12   9-12 120 125
               
FORD
  7.5″ 14-19 6-8   11-16 60 60
  8.0″ D/O 12-14 6-7   10-15 60 60
  8.0" IRS 14-19 8-10   6-10 80 80
  8.8″ 14-19 6-8 11-16 6-10 60 60
  9″ OEM R&P 13-15 6-7   10-16 70 60
  9″ NON OEM 13-15 6-7   6-10 70 60
  9″ DAYTONA 14-16 6-8   6-10 70 60
  9-3/8″ 14-16 6-8   10-15 70 60
  9.75″ 15-19 6-8 8-12 6-10 75 70
  10.25″ & 10.5″ 20-35 6-8 8-12 6-10 95 80
               
GM
  OLDS/PONTIAC D/O 14-19 6-7   6-10 55 60
  63-'79 CORVETTE 14-19 6-8   6-10 55 60
  DANA 36 CORVETTE 12-15 6-8   6-10 55 55
  DANA 44 CORVETTE 14-19 6-8   6-10 55 55
  55 CHEVY D/O 14-18 6-8   6-10 55 60
  7.25″ 11-14 6-7   6-10 55 60
  7.5″ 12-15 6-7 3-6 6-10 65 60
  7.625″  12-15 6-7 3-6 6-10 65 60
  7.75″ 12-15 6-7   6-10 65 60
  8″  12-15 6-7 3-6   65 60
  8.2″  12-15 6-7   6-10 55 60
  8.2″ OLDS/PONTIAC 12-15 6-7   6-10 55 60
  8.5″ 14-19 6-8 3-6 6-10 65 60
  8.625″  14-19 6-8 3-6 6-10 65 60
  9.25″ IFS 15-22 7-9 5-7 6-10 75 80
  8.875″ 12 BOLT CAR 14-19 6-8   6-10 55 60
  8.875″ 12 BOLT TRUCK 13-15 6-7   6-10 55 60
  10.5" AAM w/o SUPPORT 15-25 8-11 5-7 6-10    
  10.5″ 14 BOLT w/ SUPPORT 20-35 8-11   6-10 120 136
  AAM 11.5″  20-30 8-11 5-7 6-10 175 200
  H072 TRUCK PRESET     6-10 120 175