Can some one confirm this Part number?
 

The number is for a mag case tranny.

91530110120R (I am pretty sure on the last few numbers??)

I want to confirm it is a 7:31 tranny.

Thanks

EW,

That is a casting number not a part number. The numbers you need to post are stamped under the transmission. The sequential serial number is possibly in the form; 7135xxxx. There is also a type number in the form; 915/xxx. Please post these numbers and we can get you information.

Good for asking.

Best,
Grady

Thanks Grady, I will get that. This tranny is actually in your neighborhood out there. Small world.

Grady, would that number also tell individual ratios, final drive, etc.?

The casting number is 9153011020R, and the model is 915/06. Serial number 7343928.

I shift the unit into the gear opposite reverse, and for one rotation of both the output flanges, I get just over 3 rotations of the input shaft. Similar for the middle shift position pushed in (I don't have a shifter or remember the shift pattern). At first test, it looks like a 8:31 ring and pinion... Anyone have a better test?

I think that is 5th gear? 4th would be next to reverse. I think a 7:31 and 8:31 would be really close in a test like that. I think it equates to 8 turns of the out put for every 31 turns of the input so it would be a pretty small difference with just 4 or 5 turns. Maybe I am wrong. Seems like a bif diff. when you drive them??

7343928

7 = Transmission for 6-cyl. Engine
3 = 5-speed 915/06
4 = 1974 Model Year
3928 = Consecutive transmission number


915/06 5-speed

1st Gear = 11:35
2nd Gear = 18:33
3rd Gear = 23:29
4th Gear = 27:25
5th Gear = 29:21
R&P = 7:31

Best,
Grady

Thanks Grady

I believe the very desirable 74' gear box. Probably out of my reach.

Do you want me to go look at it for you?

Best,
Grady
gradyclay@hotmail.com

Thank you very much. I'd be happy to show the transmission by appointment. PM me or email me at sleeper78z*no-spam*@yahoo.com (remove the *no-spam*).

Thats OK Grady. Thanks for the offer. Its on Ebay and will probably bid higher than I can swing right now. I dont think you are that close to Denver anyway.

Grady, my transmission number is 915/61 7173828, would you please decipher it for me?

Jacko,

1977 915/61 with 8:31 r&p ... 3.875:1

1st - AZ : 11:35 == 3.181
2nd - HX : 18:33 == 1.833
3rd - NT : 23:29 == 1.261
4th - QQ : 26:26 == 1.000
5th - SN : 28:23 == 0.821

Thanks, Warren! I appreciate that. The guy I bought this trans from told me it was a 7:31 r&p, so if it is, it was replaced. Where do you guys get that information?