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How Do I Identify My Transmission? Your Top Tech Questions Answered!


We recently reached out to the guys in Summit Racing’s renowned tech department—the largest full-time staff in the industry—to identify and answer five common tech questions they hear on a consistent basis. With help from Summit Racing’s tech advisors and other industry experts, we’ll answer those questions here at OnAllCylinders. Today’s topic: transmissions.

The specific question: “What type of transmission do I have?”

It’s a basic question, but according to Summit Racing technical department supervisor Norm Koval, it’s a topic that comes up quite often among customers. It’s also a key question central to your vehicle’s performance, and it needs answered before you can proceed with a variety of performance or maintenance projects.

We have all the confidence in the world that you’ll be able to distinguish between a basic automatic or manual tranny. Now, with help from Koval and the Summit Racing tech staff, we’ll help you figure out which specific automatic or manual transmission plants your vehicle’s rear wheels.

We’ll start with common automatic transmissions.

Automatic Transmissions

Automatic TransmissionSome transmissions may have a code stamped into their case or a tag riveted to them. According to Koval, the easiest way to identify an automatic transmission, though, is by transmission pan shape. “Almost all have their own shape and pan bolt design,” Koval said. “Some are square; others are shaped like Louisiana or Texas or some other comparable shape.”

We compiled a slide show of specific pan shapes and matched them up to their automatic transmission counterparts. Find your pan shape—and ultimately your automatic transmission—in the images below:

GM Powerglide Transmission
TH-350 Transmission
TH-400 Transmission
GM TH-700R Transmission
Ford C-4 Transmission
Ford C-6 Transmission
Ford AOD, AODE, 4R70W: 14 Pan Bolts
E4OD Transmission
Torqueflite Transmission

GM Powerglide: 14 Pan Bolts

TH-250, TH-250C, TH-350, TH-350C, TH-375B: 13 Pan Bolts

GM TH-375C, TH-400, TH-475, 3L80, and 3L80HD: 13 Pan Bolts

GM TH-700-4R, 4L60, 4L60E: 16 Pan Bolts

Ford C-4 and C-5: 11 Pan Bolts

Ford C-6: 17 Pan Bolts

Ford AOD

Ford E4OD and 4R100: 20 Pan Bolts

Chrysler 727/A518: 14 Pan Bolts

Chrysler 905/A500: 14 Pan Bolts

Another way to determine your transmission is by measuring the overall dimensions. The good folks at Summit Racing also provided us with charts for that:

GM Automatic Transmissions
Type1st Gear2nd Gear3rd Gear4th GearOverall LengthBellhousing-to-Transmission Length
TH-3502.521.521.00--27-5/8" *20-3/8"
TH-4002.481.481.00--28-1/4" +26-3/4"
TH-700-R4 & 4L603.061.621.000.7023-3/8" # 22-3/8" #
*With 6″ (short) tailhousing+With short tailhousing#Except Corvette
Ford Automatic Transmissions
Type1st Gear2nd Gear3rd Gear4th GearOverall LengthBellhousing-to-
Transmission Length
C42.461.46 1.00--30-1/2"20-1/4"
C62.461.46 1.00--30-1/2"22 1/2"
AOD2.401.46 1.000.6730-3/4"22-1/4"
E40D2.711.53 1.000.7037-1/2"29-3/8"
Chrysler Automatic Transmissions
Type1st Gear2nd Gear3rd Gear4th GearOverall LengthBellhousing-to-
Transmission Length

Manual Transmissions

Manual TransmissionManual transmissions are a little bit trickier to identify, so we turned to our friends at Hurst, who have assembled a handy assortment of diagrams to help you positively ID your manual tranny. Click on your standard transmission speed below and match your manual tranny to the vehicle application, external characteristics, and diagram notes:

“As you look things over you may notice casting bosses or provisions on your transmission’s tailshaft housing,” Koval said. “Take note of the number and location. Other things to consider: On the main case, where is the inspection cover…is it a side cover or a top cover? How many bolts secure the cover to the main case and is one edge of the cover curved or straight?”

The selector arms will also help you determine the ID of your transmission, according to Koval. “How do the selector arms mount? Are there mounting studs protruding from the side case or are the selector arms secured with a bolt instead?

Using these clues and the diagrams above, you can narrow down the identity of your manual transmission. Once you’ve made a positive ID, your sales rep or tech advisor can steer you in the right direction for transmission replacement components, performance upgrades, rebuild kits, and other items to help harness all your vehicle’s power.

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  1. Pingback: Transmission FAQs: What does a Shift Kit Do? What Transmission Do I Have? (and More)

  2. Queation: I have a auto trans out of a ’68 LTD. C9ZP7006A is the code on the side. Is this a C4 or FMX? Thanks.

  3. I have a 3 speed, casting# C8AR 7006-B. Can’t find anything, any ideas?

    • Daryll Keirn says:

      I have one also, I’ was told by a local wrecking yard it is from a ’65 Mustang, Falcon or Galaxy v8, heavy duty? That’s all I know. Mine is in primo condition and for sale minus the side shift levers. If interested call me at 530-626-6043.

    • Daryll Keirn says:

      Ryan, I just noticed my transmission is missing the B at the end of the C8AR 7006′ so not sure what the B stands for?

  4. ernest ydrogo says:

    pk44315589328884 that on my transmission pan on the side i have a 1987 chrysler fifth ave 318 5.2l i want to know what kind of transmission i need for it.

  5. Looking to identify an automatic transmission with code: 84 GT 7A 041 AA FORD 1/1 b Would appreciate any help. Thank You in advance.

  6. Pingback: Transmission Match: How to Visually Identify an Automatic Transmission - OnAllCylinders

  7. Mohammed Hassan says:

    hi, my car chassis number is GS 850081508 , have purchased used , just wanted to know the original gearbox from manufacturer .


  8. I have 2 transmissions I cant id. One has a casting number of 304065903 and 3 grooves. The other has a casting number 3088386 and 2 grooves. Help!

    • OnAllCylinders says:

      Ken, we’re stumped on this one as well. We’d suggest a call to our partners in the Summit tech department: 330-630-0240.

  9. Pingback: OBD Advisor What Transmission Do I Have?

  10. I have a 4L60E tranny with pan rail number 8676358 can any one tell me what year this is

  11. I am looking to Identify a Transmission, KMHGC4DD8, or CU193436. I am not sure how to identify what it is. It is an automatic I believe.

  12. I have 2000 Buick LeSabre Custom 3.8 and the transmission is gone. i have been told there are four different transmissions that fit and I need to get the model number off the transmiison. where would I find that number on the transmission itself?

  13. Alfonso Camacho says:

    Im looking to identify transmission casting number 3702602 GM5 d184
    came in a bel air 1954 got a kit to repair it but will not be the same parts I’m very confuse with this situation can you please help me?
    Thank you.

  14. Help me id a 92 chevy k1500 manual 5 speed trans casting # GM8679098

  15. Anthony Johnson says:

    Hello I need help please . I am about to change my tranny. The one iam taking out has # 54 on the top of it. The next one that I want to put in has # 77 on it . my question is will it work.
    Its a ford eng 5.4

  16. I have a 94 chevy pickup 4×4 xcab. I have a 88 chevy 1500 also will the trans work in the 94 1500

  17. Henry calderon says:

    Still didnt answer my question I have a 1956 ford pick up truck with a 302 v8 and automatic
    Transmission pan fed but I’m missing filler tube that screws into the transmission pan I found a number on the case 9-403911 the pan is square with 14 bolts can you please help me Id the type of transmission it is so I can get a filler tube

  18. Henry Calderon says:

    Where do I look for answer

  19. Ben Gentry says:

    Hello, I have a transmission with the letters and numbers of WGT2C-1 , with a manual floor shifter. Can you tell me what it goes to and if it is worth keeping for someone who could use it? Thanks for any help.

  20. Hi there I just purchased a 5 speed manual transmission that is supposed to be for a 2003 toyota corolla. However, the shifter levers are on the front instead of the back. The number stamped in the housing is Z91008601, what transmission is this?

  21. I have a 2003 Chevrolet Tracker. Transmission tag ID 02AQ223647. How can I tell if this is the original transmission or a replaced transmission. Thank you!

  22. I am stumped! Have a 7-bolt ( 2 top, 2 mid, 3 bottom) side panel transmission. Date 1-20-67; stamp by plug 2601100; stamp pat “bell” 670370126; stamp on tailshaft 2801097. came out of an impala, but cannot pinpoint if its correct or what kind of transmission it is. 🙁 please help?

  23. jamie leonard says:

    i have tranny came out 84 ford thunderbird needn to know f c5 or aod # are 049085-m1 an e4sp-da

  24. 6278212 transmission what vehicle is it for

  25. I have a 01 grand Cherokee that was a 4.7 now switched over to a 4.0 the tags and the rivet for a tag to id what transmission it is is missing what are other way to determine if i have a 42RE or a 44RE transmission

  26. On my automatic transmission C4/C5 there is a big 5 casted on the transmission body. My servo cover has code E2TP-70027-AA. Are this indentifications that I have a C5 transmission?
    Thank you.

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